CY7B9911V
3.3V RoboClock+™
High Speed Low Voltage Programmable Skew
Clock Buffer
Features
Functional Description
■ All output pair skew <100 ps typical (250 max)
■ 3.75 to 110 MHz output operation
The CY7B9911V 3.3V RoboClock+™ High Speed Low
Voltage Programmable Skew Clock Buffer (LVPSCB) offers
user selectable control over system clock functions. These
multiple output clock drivers provide the system integrator with
functions necessary to optimize the timing of high perfor-
mance computer systems. Each of the eight individual drivers,
arranged in four pairs of user controllable outputs, can drive
terminated transmission lines with impedances as low as 50Ω.
■ User selectable output functions
❐ Selectable skew to 18 ns
❐ Inverted and non-inverted
1
1
❐ Operation at ⁄ and ⁄ input frequency
2
4
❐ Operation at 2x and 4x input frequency (input as low as
3.75 MHz)
They deliver minimal and specified output skews and full swing logic
levels (LVTTL).
■ Zero input-to-output delay
■ 50% duty cycle outputs
Each output is hardwired to one of nine delay or function
configurations. Delay increments of 0.7 to 1.5 ns are deter-
mined by the operating frequency with outputs that can skew
up to ±6 time units from their nominal “zero” skew position. The
completely integrated PLL allows external load and cancels
the transmission line delay effects. When this “zero delay”
capability of the LVPSCB is combined with the selectable
output skew functions, you can create output-to-output delays
of up to ±12 time units.
■ LVTTL outputs drive 50Ω terminated lines
■ Operates from a single 3.3V supply
■ Low operating current
■ 32-pin PLCC package
■ Jitter 100 ps (typical)
Divide-by-two and divide-by-four output functions are provided
for additional flexibility in designing complex clock systems.
When combined with the internal PLL, these divide functions
allow distribution of a low frequency clock that are multiplied
by two or four at the clock destination. This facility minimizes
clock distribution difficulty enabling maximum system clock
speed and flexibility.
Logic Block Diagram
TEST
PHASE
FB
VCO AND
TIME UNIT
GENERATOR
FREQ
DET
FILTER
REF
FS
4Q0
4Q1
4F0
4F1
SELECT
INPUTS
(THREE
LEVEL)
SKEW
SELECT
MATRIX
3Q0
3Q1
3F0
3F1
2Q0
2Q1
2F0
2F1
1Q0
1Q1
1F0
1F1
Cypress Semiconductor Corporation
Document Number: 38-07408 Rev. *D
•
198 Champion Court
•
San Jose, CA 95134-1709
•
408-943-2600
Revised June 20, 2007
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CY7B9911V
3.3V RoboClock+™
Skew Select Matrix
Block Diagram Description
The skew select matrix is comprised of four independent
sections. Each section has two low skew, high fanout drivers
(xQ0, xQ1), and two corresponding three level function select
functions for each section as determined by the function select
inputs. All times are measured with respect to the REF input
Phase Frequency Detector and Filter
The Phase Frequency Detector and Filter blocks accept inputs
from the Reference Frequency (REF) input and the Feedback
(FB) input. They generate correction information to control the
frequency of the Voltage Controlled Oscillator (VCO). These
blocks, along with the VCO, form a Phase Locked Loop (PLL)
that tracks the incoming REF signal.
assuming that the output connected to the FB input has 0t
U
selected.
Table 2. Programmable Skew Configurations
VCO and Time Unit Generator
Function Selects
Output Functions
The VCO accepts analog control inputs from the PLL filter block.
It generates a frequency used by the time unit generator to
create discrete time units that are selected in the skew select
matrix. The operational range of the VCO is determined by the
1F1,2F1, 1F0,2F0, 1Q0,1Q1,
3F1, 4F1 3F0, 4F0 2Q0, 2Q1
3Q0, 3Q1 4Q0, 4Q1
LOW
LOW
LOW
MID
LOW
MID
–4t
–3t
–2t
–1t
Divide by 2 Divide by 2
U
U
U
U
FS control pin. The time unit (t ) is determined by the operating
U
–6t
–4t
–2t
–6t
–4t
–2t
frequency of the device and the level of the FS pin as shown in
U
U
U
U
U
U
HIGH
LOW
MID
[1]
Table 1. Frequency Range Select and t Calculation
U
MID
0t
0t
0t
U
U
U
f
(MHz)
NOM
1
Approximate
tU = -----------------------
MID
HIGH
LOW
MID
+1t
+2t
+3t
+4t
+2t
+4t
+6t
+2t
+4t
+6t
U
U
U
U
U
U
U
U
U
U
FS
Frequency(MHz)At
fNOM × N
Min Max
Which t = 1.0 ns
HIGH
HIGH
HIGH
U
where N =
LOW
MID
15
25
40
30
50
44
26
16
22.7
38.5
62.5
HIGH
Divide by 4 Inverted
HIGH
110
Notes
1. For all three-state inputs, HIGH indicates a connection to V , LOW indicates a connection to GND, and MID indicates an open connection. Internal termination
CC
circuitry holds an unconnected input to V /2.
CC
2. The level to be set on FS is determined by the “normal” operating frequency (f
) of the V and Time Unit Generator (see). Nominal frequency (f
) always
NOM
NOM
appears at 1Q0 and the other outputs when they are operated in their undivided modes (see Table 2). The frequency appearing at the REF and FB inputs is f
NOM
when the output connected to FB is undivided. The frequency of the REF and FB inputs is f
using a divided output as the FB input.
/4 when the part is configured for a frequency multiplication
NOM
NOM
3. When the FS pin is selected HIGH, the REF input must not transition upon power up until V has reached 2.8V.
CC
Document Number: 38-07408 Rev. *D
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CY7B9911V
3.3V RoboClock+™
Figure 1 shows the typical outputs with FB connected to a zero skew output.
Figure 1. The Typical Outputs with FB Connected to a Zero Skew Output
FB Input
REFInput
1Fx
2Fx
3Fx
4Fx
(N/A)
LM
– 6t
– 4t
– 3t
U
U
U
LL
LH
LM
(N/A)
LH
ML
ML
– 2t
– 1t
U
U
(N/A)
MM
MH
HL
MM
(N/A)
MH
0t
U
+1t
+2t
+3t
U
U
U
HM
(N/A)
HH
HL
HM
+4t
+6t
U
U
(N/A)
(N/A)
(N/A)
LL/HH
HH
DIVIDED
INVERT
If the TEST input is forced to its MID or HIGH state, the device
operates with its internal phase locked loop disconnected, and
input levels supplied to REF directly control all outputs. Relative
output-to-output functions are the same as in normal mode.
Test Mode
The TEST input is a three level input. In normal system
operation, this pin is connected to ground, allowing the
CY7B9911V to operate as described in “Block Diagram
level inputs can have a removable jumper to ground or be tied
LOW through a 100W resistor. This enables an external tester to
change the state of these pins.
In contrast with normal operation (TEST tied LOW), all outputs
function based only on the connection of their own function
select inputs (xF0 and xF1) and the waveform characteristics of
the REF input.
Note
4. FB connected to an output selected for “zero” skew (that is, xF1 = xF0 = MID).
Document Number: 38-07408 Rev. *D
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CY7B9911V
3.3V RoboClock+™
Operational Mode Descriptions
Figure 2. Zero Skew and Zero Delay Clock Driver
REF
LOAD
Z
Z
0
L1
L2
FB
SYSTEM
CLOCK
REF
FS
LOAD
LOAD
4Q0
4Q1
4F0
4F1
0
3Q0
3Q1
3F0
3F1
L3
L4
2F0
2F1
2Q0
2Q1
Z
0
1F0
1F1
1Q0
1Q1
LOAD
TEST
Z
0
LENGTH L1 = L2 = L3 = L4
Figure 2 shows the LVPSCB configured as a zero skew clock buffer. In this mode the CY7B9911V is used as the basis for a low skew
clock distribution tree. When all the function select inputs (xF0, xF1) are left open, each of the outputs are aligned and drive a
terminated transmission line to an independent load. The FB input is tied to any output in this configuration and the operating frequency
range is selected with the FS pin. The low skew specification, along with the ability to drive terminated transmission lines (with
impedances as low as 50Ω), enables efficient printed circuit board design.
Figure 3. Programmable Skew Clock Driver
REF
LOAD
Z
0
L1
L2
FB
REF
FS
SYSTEM
CLOCK
LOAD
LOAD
4Q0
4Q1
4F0
4F1
Z
0
3Q0
3Q1
3F0
3F1
L3
L4
2F0
2F1
2Q0
2Q1
Z
0
1F0
1F1
1Q0
1Q1
LOAD
TEST
Z
0
LENGTH L1 = L2
L3 < L2 by 6 inches
L4 > L2 by 6 inches
Figure 3 shows a configuration to equalize skew between metal
traces of different lengths. In addition to low skew between
outputs, the LVPSCB is programmed to stagger the timing of its
outputs. Each of the four groups of output pairs is programmed
to different output timing. Skew timing is adjusted over a wide
range in small increments with the appropriate strapping of the
function select pins. In this configuration the 4Q0 output is sent
back to FB and configured for zero skew. The other three pairs
of outputs are programmed to yield different skews relative to the
feedback. By advancing the clock signal on the longer traces or
retarding the clock signal on shorter traces, all loads receive the
clock pulse at the same time.
(xF1, xF0 = MID) selected. The internal PLL synchronizes the FB
and REF inputs and aligns their rising edges to make certain that
all outputs have precise phase alignment.
Clock skews are advanced by ±6 time units (tU) when using an
output selected for zero skew as the feedback. A wider range of
delays is possible if the output connected to FB is also skewed.
Since “Zero Skew”, +tU, and –tU are defined relative to output
Document Number: 38-07408 Rev. *D
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CY7B9911V
3.3V RoboClock+™
groups, and the PLL aligns the rising edges of REF and FB, you
can create wider output skews by proper selection of the xFn
inputs. For example, a +10 tU between REF and 3Qx is achieved
by connecting 1Q0 to FB and setting 1F0 = 1F1 = GND, 3F0 =
MID, and 3F1 = High. (Since FB aligns at –4 tU and 3Qx skews
to +6 tU, a total of +10 tU skew is realized). Many other configu-
rations are realized by skewing both the outputs used as the FB
input and skewing the other outputs.
Figure 5 shows the LVPSCB configured as a clock multiplier. The
3Q0 output is programmed to divide by four and is sent back to
FB. This causes the PLL to increase its frequency until the 3Q0
and 3Q1 outputs are locked at 20 MHz, while the 1Qx and 2Qx
outputs run at 80 MHz. The 4Q0 and 4Q1 outputs are
programmed to divide by two, that results in a 40 MHz waveform
at these outputs. Note that the 20 and 40 MHz clocks fall simul-
taneously and are out of phase on their rising edge. This enables
1
1
the designer to use the rising edges of the ⁄ frequency and ⁄
2
4
Figure 4. Inverted Output Connections
frequency outputs without concern for rising edge skew. The
2Q0, 2Q1, 1Q0, and 1Q1 outputs run at 80 MHz and are skewed
by programming their select inputs accordingly. Note that the FS
pin is wired for 80 MHz operation because that is the frequency
of the fastest output.
REF
FB
Figure 6. Frequency Divider Connections
REF
FS
REF
4Q0
4Q1
4F0
4F1
FB
REF
FS
3Q0
3Q1
3F0
3F1
20 MHz
2Q0
2Q1
2F0
2F1
10 MHz
4Q0
4F0
4Q1
4F1
1Q0
1Q1
5 MHz
1F0
1F1
3Q0
3Q1
3F0
3F1
20 MHz
TEST
2Q0
2Q1
2F0
2F1
1F0
1F1
1Q0
1Q1
Figure 4 shows an example of the invert function of the LVPSCB.
In this example, the 4Q0 output used as the FB input is
programmed for invert (4F0 = 4F1 = HIGH) while the other three
pairs of outputs are programmed for zero skew. When 4F0 and
4F1 are tied HIGH, 4Q0 and 4Q1 become inverted zero phase
outputs. The PLL aligns the rising edge of the FB input with the
rising edge of the REF. This causes the 1Q, 2Q, and 3Q outputs
to become the “inverted” outputs with respect to the REF input.
By selecting the output connected to FB, you can have two
inverted and six non-inverted outputs or six inverted and two
non-inverted outputs. The correct configuration is determined by
the need for more (or fewer) inverted outputs. 1Q, 2Q, and 3Q
outputs are also skewed to compensate for varying trace delays
independent of inversion on 4Q.
TEST
Figure 6 shows the LVPSCB in a clock divider application. 2Q0
is sent back to the FB input and programmed for zero skew. 3Qx
is programmed to divide by four. 4Qx is programmed to divide by
two. Note that the falling edges of the 4Qx and 3Qx outputs are
aligned. This enables use of the rising edges of the ⁄ frequency
and ⁄ frequency without concern for skew mismatch. The 1Qx
outputs are programmed to zero skew and are aligned with the
2Qx outputs. In this example, the FS input is grounded to
configure the device in the 15 to 30 MHz range, since the highest
frequency output is running at 20 MHz.
1
2
1
4
Figure 5. Frequency Multiplier with Skew Connections
Figure 7 shows some of the functions that are selectable on the
3Qx and 4Qx outputs. These include inverted outputs and
outputs that offer divide-by-2 and divide-by-4 timing. An inverted
output enables the system designer to clock different
subsystems on opposite edges, without suffering from the pulse
asymmetry typical of non-ideal loading. This function enables
each of the two subsystems to clock 180 degrees out of phase,
but still is aligned within the skew specification.
REF
FB
20 MHz
REF
FS
40 MHz
4Q0
4Q1
4F0
4F1
The divided outputs offer a zero delay divider for portions of the
system that divide the clock by either two or four, and still remain
within a narrow skew of the “1X” clock. Without this feature, an
external divider is added, and the propagation delay of the
divider adds to the skew between the different clock signals.
20 MHz
80 MHz
3Q0
3Q1
3F0
3F1
2F0
2F1
2Q0
2Q1
1Q0
1Q1
1F0
1F1
TEST
These divided outputs, coupled with the Phase Locked Loop,
allow the LVPSCB to multiply the clock rate at the REF input by
either two or four. This mode enables the designer to distribute
a low frequency clock between various portions of the system,
and then locally multiply the clock rate to a more suitable
Document Number: 38-07408 Rev. *D
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CY7B9911V
3.3V RoboClock+™
frequency, while still maintaining the low skew characteristics of
the clock driver. The LVPSCB performs all of the functions
described in this section at the same time. It can multiply by two
and four or divide by two (and four) at the same time. This shifts
its outputs over a wide range or maintain zero skew between
selected outputs.
Figure 7. Multi-Function Clock Driver
REF
LOAD
Z
0
110 MHz
INVERTED
FB
REF
FS
27.5 MHz
DISTRIBUTION
CLOCK
LOAD
LOAD
4Q0
4Q1
4F0
4F1
27.5 MHz
Z
0
3Q0
3Q1
2Q0
2Q1
3F0
3F1
2F0
2F1
110 MHz
ZERO SKEW
Z
0
1Q0
1Q1
1F0
LOAD
110 MHz
SKEWED –2.273 ns (–4tU)
1F1
TEST
Z
0
Figure 8. Board-to-Board Clock Distribution
LOAD
REF
Z
0
L1
FB
LOAD
LOAD
SYSTEM
CLOCK
REF
FS
4F0
4F1
L2
Z
0
4Q0
4Q1
3Q0
3Q1
3F0
3F1
L3
2F0
2F1
2Q0
2Q1
Z
0
1F0
1F1
1Q0
1Q1
L4
FB
REF
TEST
FS
LOAD
4Q0
4Q1
4F0
4F1
3F0
3F1
2F0
2F1
Z
0
3Q0
3Q1
2Q0
2Q1
LOAD
1F0
1Q0
1Q1
1F1
TEST
Figure 8 shows the CY7B9911V connected in series to construct a zero skew clock distribution tree between boards. Delays of the
downstream clock buffers are programmed to compensate for the wire length (that is, select negative skew equal to the wire delay)
necessary to connect them to the master clock source, approximating a zero delay clock tree. Cascaded clock buffers accumulates
low frequency jitter because of the non-ideal filtering characteristics of the PLL filter. Do not connect more than two clock buffers in a
series.
Document Number: 38-07408 Rev. *D
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CY7B9911V
3.3V RoboClock+™
Output Current into Outputs (LOW)............................. 64 mA
Maximum Ratings
Static Discharge Voltage...........................................> 2001V
(MIL-STD-883, Method 3015)
Operating outside these boundaries may affect the performance
and life of the device. These user guidelines are not tested.
Latch up Current.....................................................> 200 mA
Storage Temperature ................................. –65°C to +150°C
Operating Range
Ambient Temperature with
Power Applied ............................................ –55°C to +125°C
Range
Ambient Temperature
V
CC
Supply Voltage to Ground Potential................–0.5V to +7.0V
DC Input Voltage ............................................–0.5V to +7.0V
Commercial
0°C to +70°C
3.3V ± 10%
Electrical Characteristics
Over the Operating Range
CY7B9911V
Parameter
Description
Output HIGH Voltage
Test Conditions
= Min, I = –18 mA
Unit
Min
Max
V
V
V
V
V
V
V
2.4
V
V
V
V
V
OH
OL
IH
CC
OH
Output LOW Voltage
= Min, I = 35 mA
0.45
CC
OL
Input HIGH Voltage (REF and FB inputs only)
Input LOW Voltage (REF and FB inputs only)
2.0
–0.5
V
CC
0.8
IL
Min ≤ V ≤ Max
0.87 * V
V
CC
IHH
CC
CC
xFn)
V
V
I
xFn)
Min ≤ V ≤ Max
0.47 * V
0.0
0.53 * V
V
V
IMM
ILL
CC
CC
CC
Min ≤ V ≤ Max
0.13 * V
20
CC
CC
xFn)
Input HIGH Leakage Current (REF and FB
inputs only)
V
= Max, V = Max
μA
μA
IH
CC
CC
IN
I
Input LOW Leakage Current (REF and FB
inputs only)
V
= Max, V = 0.4V
–20
–50
IL
IN
I
I
I
I
I
Input HIGH Current (Test, FS, xFn)
Input MID Current (Test, FS, xFn)
Input LOW Current (Test, FS, xFn)
V
V
V
V
V
= V
CC
200
50
μA
μA
IHH
IMM
ILL
IN
= V /2
IN
CC
= GND
–200
–200
95
μA
IN
Short Circuit Current
= MAX, V
= GND (25° only)
mA
mA
OS
CC
OUT
Operating Current Used by Internal Circuitry
= V
= Max, All Com’l
CCQ
CCN
CCQ
Input Selects Open
Mil/Ind
100
19
I
Output Buffer Current per Output Pair
V
= V = Max,
mA
CCN
CCN
CCQ
I
= 0 mA Input Selects Open, f
OUT
MAX
MAX
[9]
PD
Power Dissipation per Output Pair
V
= V
= Max,
104
mW
CCN
CCQ
I
= 0 mA Input Selects Open, f
OUT
Notes
5. For more information see Group A subgroup testing information.
6. These inputs are normally wired to VCC, GND, or left unconnected (actual threshold voltages vary as a percentage of VCC). Internal termination resistors hold
unconnected inputs at VCC/2. If these inputs are switched, the function and timing of the outputs glitch and the PLL may require an additional tLOCK time
before all data sheet limits are achieved.
7. CY7B9911V must be tested one output at a time, output shorted for less than one second, less than 10% duty cycle. Room temperature only.
8. Total output current per output pair is approximated by the following expression that includes device current plus load current:
CY7B9911V:ICCN = [(4 + 0.11F) + [[((835 –3F)/Z) + (.0022FC)]N] x 1.1
Where
F = frequency in MHz
C = capacitive load in pF
Z = line impedance in ohms
N = number of loaded outputs; 0, 1, or 2
FC = F < C
9. Total power dissipation per output pair is approximated by the following expression that includes device power dissipation plus power dissipation due to the
load circuit:
Document Number: 38-07408 Rev. *D
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CY7B9911V
3.3V RoboClock+™
Capacitance
[10]
Tested initially and after any design or process changes that may affect these parameters.
Parameter
Description
Test Conditions
T = 25°C, f = 1 MHz, V = 3.3V
Max
Unit
C
Input Capacitance
10
pF
IN
A
CC
Note
10. Applies to REF and FB inputs only.
AC Test Loads and Waveforms
Figure 9. AC Test Loads and Waveforms
VCC
3.0V
2.0V
=1.5V
0.8V
2.0V
=1.5V
0.8V
R1=100
R2=100
R1
R2
V
th
V
th
C = 30 pF
L
0.0V
C
L
(Includes fixture and probe capacitance)
≤1ns
≤1ns
TTL ACTest Load
TTL Input Test Waveform
Switching Characteristics – 5 Option
Over the Operating Range
CY7B9911V-5
Typ
Parameter
Description
FS = LOW
Unit
Min
15
Max
f
Operating Clock
Frequency in MHz
30
50
MHz
NOM
FS = MID
25
FS = HIGH
40
110
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
REF Pulse Width HIGH
REF Pulse Width LOW
Programmable Skew Unit
5.0
5.0
ns
ns
RPWH
RPWL
U
Zero Output Matched-Pair Skew (XQ0, XQ1)
0.1
0.25
0.6
0.5
0.5
0.5
0.25
0.5
0.7
1.0
0.7
1.0
1.25
+0.5
+1.0
2.5
3
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
ps
ps
SKEWPR
SKEW0
SKEW1
SKEW2
SKEW3
SKEW4
DEV
Zero Output Skew (All Outputs)
Output Skew (Rise-Rise, Fall-Fall, Same Class Outputs)
Output Skew (Rise-Fall, Nominal-Inverted, Divided-Divided)
Output Skew (Rise-Rise, Fall-Fall, Different Class Outputs)
Output Skew (Rise-Fall, Nominal-Divided, Divided-Inverted)
Device-to-Device Skew
Propagation Delay, REF Rise to FB Rise
–0.5
–1.0
0.0
0.0
PD
[19]
Output Duty Cycle Variation
ODCV
PWH
Output HIGH Time Deviation from 50%
[20]
Output LOW Time Deviation from 50%
PWL
Output Rise Time
0.15
0.15
1.0
1.0
1.5
1.5
0.5
25
ORISE
OFALL
LOCK
JR
Output Fall Time
PLL Lock Time
Cycle-to-Cycle Output
Jitter
RMS
[12]
Peak-to-Peak
200
Document Number: 38-07408 Rev. *D
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CY7B9911V
3.3V RoboClock+™
Switching Characteristics – 7 Option
Over the Operating Range
CY7B9911V-7
Typ
Parameter
Description
FS = LOW
Unit
Min
15
Max
30
f
Operating Clock
MHz
NOM
Frequency in MHz
FS = MID
25
50
FS = HIGH
40
110
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
REF Pulse Width HIGH
REF Pulse Width LOW
Programmable Skew Unit
5.0
5.0
ns
ns
RPWH
RPWL
U
Zero Output Matched Pair Skew (XQ0, XQ1)
0.1
0.3
0.6
1.0
0.7
1.2
0.25
0.75
1.0
1.5
1.2
1.7
1.65
+0.7
+1.2
3
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
ps
ps
SKEWPR
SKEW0
SKEW1
SKEW2
SKEW3
SKEW4
DEV
Zero Output Skew (All Outputs)
Output Skew (Rise-Rise, Fall-Fall, Same Class Outputs)
Output Skew (Rise-Fall, Nominal-Inverted, Divided-Divided)
Output Skew (Rise-Rise, Fall-Fall, Different Class Outputs)
Output Skew (Rise-Fall, Nominal-Divided, Divided-Inverted)
Device-to-Device Skew
Propagation Delay, REF Rise to FB Rise
–0.7
–1.2
0.0
0.0
PD
Output Duty Cycle Variation
ODCV
PWH
Output HIGH Time Deviation from 50%
Output LOW Time Deviation from 50%
3.5
2.5
2.5
0.5
25
PWL
Output Rise Time
0.15
0.15
1.5
1.5
ORISE
OFALL
LOCK
JR
Output Fall Time
PLL Lock Time
Cycle-to-Cycle Output
Jitter
RMS
Peak
[12]
100
200
Notes
11. Test measurement levels for the CY7B9911V are TTL levels (1.5V to 1.5V). Test conditions assume signal transition times of 2 ns or less and output loading
12. Guaranteed by statistical correlation. Tested initially and after any design or process changes that may affect these parameters.
13. SKEW is defined as the time between the earliest and the latest output transition among all outputs for which the same tU delay is selected when all are loaded
with 30 pF and terminated with 50Ω to VCC/2 (CY7B9911V).
14. tSKEWPR is defined as the skew between a pair of outputs (XQ0 and XQ1) when all eight outputs are selected for 0tU.
15. tSKEW0 is defined as the skew between outputs when they are selected for 0tU. Other outputs are divided or inverted but not shifted.
16. CL=0 pF. For CL=30 pF, tSKEW0=0.35 ns.
17. There are three classes of outputs: Nominal (multiple of tU delay), Inverted (4Q0 and 4Q1 only with 4F0 = 4F1 = HIGH), and Divided (3Qx and 4Qx only in
Divide-by-2 or Divide-by-4 mode).
18. tDEV is the output-to-output skew between any two devices operating under the same conditions (VCC ambient temperature, air flow, and so on.)
19. tODCV is the deviation of the output from a 50% duty cycle. Output pulse width variations are included in tSKEW2 and tSKEW4 specifications.
20. Specified with outputs loaded with 30 pF for the CY7B9911V-5 and -7 devices. Devices are terminated through 50Ω to VCC/2.tPWH is measured at 2.0V. tPWL
is measured at 0.8V.
21. tORISE and tOFALL measured between 0.8V and 2.0V.
22. tLOCK is the time that is required before synchronization is achieved. This specification is valid only after VCC is stable and within normal operating limits. This
parameter is measured from the application of a new signal or frequency at REF or FB until tPD is within specified limits.
Document Number: 38-07408 Rev. *D
Page 10 of 14
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CY7B9911V
3.3V RoboClock+™
AC Timing Diagrams
t
t
RPWL
REF
t
RPWH
REF
t
t
ODCV
PD
t
ODCV
FB
Q
t
JR
t
t
t
t
SKEWPR,
SKEW0,1
SKEWPR,
SKEW0,1
OTHERQ
t
SKEW2
t
SKEW2
INVERTED Q
t
SKEW3,4
t
t
SKEW3,4
t
SKEW3,4
REF DIVIDED BY 2
REF DIVIDED BY 4
t
SKEW1,3, 4
SKEW2,4
Document Number: 38-07408 Rev. *D
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CY7B9911V
3.3V RoboClock+™
Ordering Information
Operating
Range
Accuracy (ps)
Ordering Code
Package Type
32-Pb Plastic Leaded Chip Carrier
500
500
CY7B9911V-5JC
CY7B9911V-5JCT
Commercial
Commercial
Commercial
Commercial
32-Pb Plastic Leaded Chip Carrier – Tape and Reel
32-Pb Plastic Leaded Chip Carrier
700
CY7B9911V-7JC
CY7B9911V-7JCT
700
32-Pb Plastic Leaded Chip Carrier – Tape and Reel
Pb-Free
500
CY7B9911V-5JXC
32-Pb Plastic Leaded Chip Carrier
Commercial
Commercial
Commercial
Commercial
500
CY7B9911V-5JXCT
32-Pb Plastic Leaded Chip Carrier – Tape and Reel
32-Pb Plastic Leaded Chip Carrier
700
CY7B9911V-7JXC
CY7B9911V-7JXCT
[23]
700
32-Pb Plastic Leaded Chip Carrier – Tape and Reel
Note
23. Parts not recommended for the new design.
Document Number: 38-07408 Rev. *D
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CY7B9911V
3.3V RoboClock+™
Package Diagram
Figure 10. 32-Pin Plastic Leaded Chip Carrier J65
51-85002-*B
Document Number: 38-07408 Rev. *D
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CY7B9911V
3.3V RoboClock+™
Document History Page
Document Title: CY7B9911V 3.3V RoboClock+™ High Speed Low Voltage Programmable Skew Clock Buffer
Document Number: 38-07408
Orig. of
Change
REV.
ECN NO. Issue Date
Description of Change
**
114350
299713
3/20/02
DSG
Change from Specification number: 38-00765 to 38-07408
*A
See ECN
RGL
Added Tape and Reel and Pb-free Devices in the Ordering Information table
Added 100 ps typical value for jitter (peak)
*B
*C
404630
See ECN
RGL
Minor Change: Added a note in ordering table that Pb-free is in Pure Sn
1199925
See ECN KVM/AESA Added Note 23: Parts not recommended for the new design in Ordering
Information table
*D
1286064
See ECN
AESA
Change status to final
© Cypress Semiconductor Corporation, 2002-2007. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of
any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be used for
medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its products for use as
critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress products in life-support systems
application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.
Any Source Code (software and/or firmware) is owned by Cypress Semiconductor Corporation (Cypress) and is protected by and subject to worldwide patent protection (United States and foreign),
United States copyright laws and international treaty provisions. Cypress hereby grants to licensee a personal, non-exclusive, non-transferable license to copy, use, modify, create derivative works of,
and compile the Cypress Source Code and derivative works for the sole purpose of creating custom software and or firmware in support of licensee product to be used only in conjunction with a Cypress
integrated circuit as specified in the applicable agreement. Any reproduction, modification, translation, compilation, or representation of this Source Code except as specified above is prohibited without
the express written permission of Cypress.
Disclaimer: CYPRESS MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cypress reserves the right to make changes without further notice to the materials described herein. Cypress does not
assume any liability arising out of the application or use of any product or circuit described herein. Cypress does not authorize its products for use as critical components in life-support systems where
a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress’ product in a life-support systems application implies that the manufacturer
assumes all risk of such use and in doing so indemnifies Cypress against all charges.
Use may be limited by and subject to the applicable Cypress software license agreement.
Document Number: 38-07408 Rev. *D
Revised June 20, 2007
Page 14 of 14
PSoC Designer™, Programmable System-on-Chip™, and PSoC Express™ are trademarks and PSoC® is a registered trademark of Cypress Semiconductor Corp. All other trademarks or registered
2
trademarks referenced herein are property of the respective corporations. Purchase of I C components from Cypress or one of its sublicensed Associated Companies conveys a license under the
2
2
2
Philips I C Patent Rights to use these components in an I C system, provided that the system conforms to the I C Standard Specification as defined by Philips. RoboClock+ is a trademark of Cypress
Semiconductor Corporation. All products and company names mentioned in this document may be the trademarks of their respective holders.
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