STK22C48
16 Kbit (2K x 8) AutoStore nvSRAM
Features
Functional Description
■ 25 ns and 45 ns access times
The Cypress STK22C48 is a fast static RAM with a nonvolatile
element in each memory cell. The embedded nonvolatile
■ Hands off automatic STORE on power down with external 68
µF capacitor
elements incorporate QuantumTrap technology producing the
world’s most reliable nonvolatile memory. The SRAM provides
unlimited read and write cycles, while independent nonvolatile
data resides in the highly reliable QuantumTrap cell. Data
transfers from the SRAM to the nonvolatile elements (the
STORE operation) takes place automatically at power down. On
power up, data is restored to the SRAM (the RECALL operation)
from the nonvolatile memory. A hardware STORE is initiated with
the HSB pin.
■ STORE to QuantumTrap™ nonvolatile elements is initiated by
software, hardware, or AutoStore™ on power down
■ RECALL to SRAM initiated by software or power up
■ Unlimited Read, Write, and Recall cycles
■ 1,000,000 STORE cycles to QuantumTrap
■ 100 year data retention to QuantumTrap
■ Single 5V+10% operation
■ Commercial and industrial temperatures
■ 28-pin 300 mil and (330 mil) SOIC package
■ RoHS compliance
Logic Block Diagram
V
V
CC
CAP
Quantum Trap
32 X 512
POWER
A5
STORE
CONTROL
A6
RECALL
STORE/
RECALL
CONTROL
STATIC RAM
ARRAY
32 X 512
A7
A8
HSB
A9
DQ0
COLUMN I/O
DQ1
DQ2
DQ3
COLUMN DEC
DQ4
DQ5
DQ6
DQ7
A0
A4
A10
A1
A3
A2
OE
CE
WE
Cypress Semiconductor Corporation
Document Number: 001-51000 Rev. **
•
198 Champion Court
•
San Jose, CA 95134-1709
•
408-943-2600
Revised January 30, 2009
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STK22C48
Figure 2. AutoStore Mode
Device Operation
The STK22C48 nvSRAM is made up of two functional compo-
nents paired in the same physical cell. These are an SRAM
memory cell and a nonvolatile QuantumTrap cell. The SRAM
memory cell operates as a standard fast static RAM. Data in the
SRAM is transferred to the nonvolatile cell (the STORE
operation) or from the nonvolatile cell to SRAM (the RECALL
operation). This unique architecture enables the storage and
recall of all cells in parallel. During the STORE and RECALL
operations, SRAM Read and Write operations are inhibited. The
STK22C48 supports unlimited reads and writes similar to a
typical SRAM. In addition, it provides unlimited RECALL opera-
tions from the nonvolatile cells and up to one million STORE
operations.
9&$3
9FF
:(
+6%
SRAM Read
The STK22C48 performs a Read cycle whenever CE and OE are
LOW while WE and HSB are HIGH. The address specified on
pins A
determines the 2,048 data bytes accessed. When the
0–10
Read is initiated by an address transition, the outputs are valid
after a delay of t (Read cycle 1). If the Read is initiated by CE
AA
or OE, the outputs are valid at t
or at t
, whichever is later
ACE
DOE
9VV
(Read cycle 2). The data outputs repeatedly respond to address
changes within the t access time without the need for transi-
AA
tions on any control input pins, and remains valid until another
address change or until CE or OE is brought HIGH, or WE or
HSB is brought LOW.
In system power mode, both V and V
are connected to the
CAP
CC
+5V power supply without the 68 μF capacitor. In this mode, the
AutoStore function of the STK22C48 operates on the stored
system charge as power goes down. The user must, however,
SRAM Write
guarantee that V does not drop below 3.6V during the 10 ms
CC
STORE cycle.
A Write cycle is performed whenever CE and WE are LOW and
HSB is HIGH. The address inputs must be stable prior to entering
the Write cycle and must remain stable until either CE or WE
goes HIGH at the end of the cycle. The data on the common IO
To prevent unneeded STORE operations, automatic STOREs
and those initiated by externally driving HSB LOW are ignored,
unless at least one WRITE operation takes place since the most
recent STORE or RECALL cycle. An optional pull up resistor is
shown connected to HSB. This is used to signal the system that
the AutoStore cycle is in progress.
pins DQ
are written into the memory if it has valid t , before
0–7
SD
the end of a WE controlled Write or before the end of an CE
controlled Write. Keep OE HIGH during the entire Write cycle to
avoid data bus contention on common IO lines. If OE is left LOW,
internal circuitry turns off the output buffers t
LOW.
after WE goes
AutoStore Inhibit mode
HZWE
If an automatic STORE on power loss is not required, then V
CC
AutoStore Operation
is tied to ground and +5V is applied to V
CAP
disabled. If the STK22C48 is operated in this configuration, refer-
During normal operation, the device draws current from V to
charge a capacitor connected to the V
CC
pin. This stored
ences to V are changed to V
throughout this data sheet.
CAP
CC
CAP
charge is used by the chip to perform a single STORE operation.
If the voltage on the V pin drops below V , the part
In this mode, STORE operations are triggered with the HSB pin.
It is not permissible to change between these three options “on
the fly”.
CC
SWITCH
automatically disconnects the V
operation is initiated with power provided by the V
pin from V . A STORE
CAP
CC
capacitor.
CAP
Figure 2 shows the proper connection of the storage capacitor
(V ) for automatic store operation. A charge storage capacitor
CAP
between 68 µF and 220 µF (+20%) rated at 6V should be
Document Number: 001-51000 Rev. **
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STK22C48
Figure 3. AutoStore Inhibit Mode
Data Protection
The STK22C48 protects data from corruption during low voltage
conditions by inhibiting all externally initiated STORE and Write
operations. The low voltage condition is detected when V is
CC
less than V
. If the STK22C48 is in a Write mode (both CE
9&$3
9FF
:(
SWITCH
and WE are low) at power up after a RECALL or after a STORE,
the Write is inhibited until a negative transition on CE or WE is
detected. This protects against inadvertent writes during power
up or brown out conditions.
+6%
Noise Considerations
The STK22C48 is a high speed memory. It must have a high
frequency bypass capacitor of approximately 0.1 µF connected
between V and V
using leads and traces that are as short
CC
SS,
as possible. As with all high speed CMOS ICs, careful routing of
power, ground, and signals reduce circuit noise.
Hardware Protect
9VV
The STK22C48 offers hardware protection against inadvertent
STORE operation and SRAM Writes during low voltage condi-
tions. When V
<V
, all externally initiated STORE
CAP
SWITCH
operations and SRAM Writes are inhibited. AutoStore can be
completely disabled by tying VCC to ground and applying +5V to
Hardware STORE (HSB) Operation
V
. This is the AutoStore Inhibit mode; in this mode, STOREs
CAP
The STK22C48 provides the HSB pin for controlling and
acknowledging the STORE operations. The HSB pin is used to
request a hardware STORE cycle. When the HSB pin is driven
LOW, the STK22C48 conditionally initiates a STORE operation
are only initiated by explicit request using either the software
sequence or the HSB pin.
Low Average Active Power
after t
. An actual STORE cycle only begins if a Write to the
DELAY
SRAM takes place since the last STORE or RECALL cycle. The
HSB pin also acts as an open drain driver that is internally driven
LOW to indicate a busy condition, while the STORE (initiated by
any means) is in progress. Pull up this pin with an external 10K
CMOS technology provides the STK22C48 the benefit of
drawing significantly less current when it is cycled at times longer
and
CC
shown for both CMOS and TTL input levels (commercial temper-
ature range, VCC = 5.5V, 100% duty cycle on chip enable). Only
standby current is drawn when the chip is disabled. The overall
average current drawn by the STK22C48 depends on the
following items:
ohm resistor to V
if HSB is used as a driver.
CAP
SRAM Read and Write operations, that are in progress when
HSB is driven LOW by any means, are given time to complete
before the STORE operation is initiated. After HSB goes LOW,
the STK22C48 continues SRAM operations for t
. During
DELAY
t
, multiple SRAM Read operations take place. If a Write is
DELAY
■ The duty cycle of chip enable
■ The overall cycle rate for accesses
■ The ratio of Reads to Writes
■ CMOS versus TTL input levels
■ The operating temperature
in progress when HSB is pulled LOW, it allows a time, t
complete. However, any SRAM Write cycles requested after
HSB goes LOW are inhibited until HSB returns HIGH.
to
DELAY
During any STORE operation, regardless of how it is initiated,
the STK22C48 continues to drive the HSB pin LOW, releasing it
only when the STORE is complete. After completing the STORE
operation, the STK22C48 remains disabled until the HSB pin
returns HIGH.
■ The V level
CC
If HSB is not used, it is left unconnected.
■ IO loading
Hardware RECALL (Power Up)
During power up or after any low power condition (V
<
CC
V
), an internal RECALL request is latched. When V
RESET
CC
once again exceeds the sense voltage of V
, a RECALL
SWITCH
cycle is automatically initiated and takes t
to complete.
HRECALL
Document Number: 001-51000 Rev. **
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STK22C48
Figure 4. Current Versus Cycle Time (Read)
device drives HSB LOW for 20 ns at the onset of a STORE.
When the STK22C48 is connected for AutoStore operation
(system V connected to V and a 68 μF capacitor on V )
CC
crosses V
CC
CAP
and V
on the way down, the STK22C48
CC
SWITCH
attempts to pull HSB LOW. If HSB does not actually get below
V , the part stops trying to pull HSB LOW and abort the STORE
IL
attempt.
Best Practices
nvSRAM products have been used effectively for over 15 years.
While ease of use is one of the product’s main system values,
experience gained working with hundreds of applications has
resulted in the following suggestions as best practices:
■ The nonvolatile cells in an nvSRAM are programmed on the
test floor during final test and quality assurance. Incoming
inspection routines at customer or contract manufacturer’s
sitessometimesreprogramthesevalues. FinalNVpatternsare
typically repeating patterns of AA, 55, 00, FF, A5, or 5A. The
end product’s firmware should not assume that an NV array is
in a set programmed state. Routines that check memory
content values to determine first time system configuration,
cold or warm boot status, and so on must always program a
unique NV pattern (for example, complex 4-byte pattern of 46
E6 49 53 hex or more random bytes) as part of the final system
manufacturing test to ensure these system routines work
consistently.
Figure 5. Current Versus Cycle Time (Write)
■ Power up boot firmware routines should rewrite the nvSRAM
into the desired state. While the nvSRAM is shipped in a preset
state, best practice is to again rewrite the nvSRAM into the
desired state as a safeguard against events that might flip the
bit inadvertently (program bugs, incoming inspection routines,
and so on).
■ TheV
valuespecifiedinthisdatasheetincludesaminimum
CAP
and a maximum value size. The best practice is to meet this
requirementandnotexceedthemaximumV valuebecause
CAP
the higher inrush currents may reduce the reliability of the
internal pass transistor. Customers who want to use a larger
Preventing Store
V
value to make sure there is extra store charge should
The STORE function is disabled by holding HSB high with a
CAP
discuss their V
size selection with Cypress.
driver capable of sourcing 30 mA at a V
of at least 2.2V,
CAP
OH
because it must overpower the internal pull down device. This
Table 2. Hardware Mode Selection
CE
H
L
WE
X
HSB
H
A10–A0
Mode
IO
Power
X
X
X
X
Not Selected
Read SRAM
Output High Z
Output Data
Input Data
Standby
[1]
H
H
Active
L
L
H
Write SRAM
Active
X
X
L
Nonvolatile STORE
Output High Z
I
CC2
Notes
1. I/O state assumes OE < V . Activation of nonvolatile cycles does not depend on state of OE.
IL
2. HSB STORE operation occurs only if an SRAM Write is done since the last nonvolatile cycle. After the STORE (If any) completes, the part goes into standby mode,
inhibiting all operations until HSB rises.
Document Number: 001-51000 Rev. **
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STK22C48
Voltage on DQ or HSB .......................–0.5V to Vcc + 0.5V
Maximum Ratings
0-7
Power Dissipation ......................................................... 1.0W
DC Output Current (1 output at a time, 1s duration).... 15 mA
Exceeding maximum ratings may shorten the useful life of the
device. These user guidelines are not tested.
Storage Temperature ................................. –65°C to +150°C
Temperature under bias.............................. –55°C to +125°C
Operating Range
Range
Commercial
Industrial
Ambient Temperature
0°C to +70°C
V
CC
Supply Voltage on V Relative to GND ..........–0.5V to 7.0V
CC
4.5V to 5.5V
4.5V to 5.5V
Voltage on Input Relative to Vss............–0.6V to V + 0.5V
CC
-40°C to +85°C
DC Electrical Characteristics
Over the operating range (V = 4.5V to 5.5V)
CC
Parameter
Description
Average V Current
Test Conditions
Min
Max
Unit
I
t
t
= 25 ns
= 45 ns
Commercial
Industrial
85
65
mA
mA
CC1
CC
RC
RC
Dependent on output loading and cycle
rate. Values obtained without output loads.
90
65
mA
mA
I
= 0 mA.
OUT
I
I
Average V Current during
STORE
All Inputs Do Not Care, V = Max
3
mA
mA
CC2
CC
CC
Average current for duration t
STORE
Average V Current at t
=
WE > (V – 0.2V). All other inputs cycling.
10
CC3
CC
RC
CC
200 ns, 5V, 25°C Typical
Dependent on output loading and cycle rate. Values
obtained without output loads.
I
I
Average V
AutoStore Cycle
Current during
All Inputs Do Not Care, V = Max
2
mA
CC4
CAP
CC
Average current for duration t
STORE
Average Vcc Current
(Standby, Cycling TTL Input
Levels)
t
t
= 25 ns, CE > V
= 45 ns, CE > V
Commercial
Industrial
25
18
mA
mA
SB1
RC
RC
IH
IH
26
19
mA
mA
I
V
Standby Current
CE > (V – 0.2V). All others V < 0.2V or > (V – 0.2V).
1.5
mA
SB2
CC
CC
IN
CC
Standby current level after nonvolatile cycle is complete.
Inputs are static. f = 0 MHz.
I
I
Input Leakage Current
V
V
= Max, V < V < V
CC
-1
-5
+1
+5
μA
μA
ILK
CC
CC
SS
IN
Off State Output Leakage
Current
= Max, V < V < V , CE or OE > V or WE < V
SS IN CC IH IL
OLK
V
Input HIGH Voltage
2.2
V
0.5
+
V
IH
CC
V
V
V
V
V
Input LOW Voltage
Output HIGH Voltage
Output LOW Voltage
V
– 0.5
0.8
V
V
IL
SS
I
I
= –4 mA except HSB
= 8 mA except HSB
= 3 mA
2.4
61
OH
OL
BL
OUT
OUT
OUT
0.4
0.4
V
Logic ‘0’ Voltage on HSB Output I
Storage Capacitor
V
Between V
nom.
pin and Vss, 6V rated. 68 uF -10%, +20%
CAP
220
µF
CAP
Data Retention and Endurance
Parameter
Description
Min
Unit
DATA
Data Retention
100
Years
K
R
NV
Nonvolatile STORE Operations
1,000
C
Notes
3.
V
reference levels throughout this data sheet refer to VCC if that is where the power supply connection is made, or V
if VCC is connected to ground.
CC
CAP
4. CE > V does not produce standby current levels until any nonvolatile cycle in progress has timed out.
IH
Document Number: 001-51000 Rev. **
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STK22C48
Capacitance
In the following table, the capacitance parameters are listed.
Parameter
Description
Input Capacitance
Output Capacitance
Test Conditions
Max
8
Unit
pF
C
C
T = 25°C, f = 1 MHz,
CC
IN
A
V
= 0 to 3.0V
7
pF
OUT
Thermal Resistance
In the following table, the thermal resistance parameters are listed.
28-SOIC
(300 mil)
28-SOIC
(330 mil)
Parameter
Description
Test Conditions
Unit
ΘJA
Thermal Resistance
(Junction to Ambient)
Test conditions follow standard test methods
and procedures for measuring thermal
impedance, per EIA / JESD51.
TBD
TBD
°C/W
ΘJC
Thermal Resistance
(Junction to Case)
TBD
TBD
°C/W
Figure 6. AC Test Loads
R1 963Ω
R1 963Ω
For Tri-state Specs
5.0V
5.0V
Output
Output
R2
R2
512
30 pF
5 pF
512Ω
Ω
AC Test Conditions
Input Pulse Levels....................................................0V to 3V
Input Rise and Fall Times (10% to 90%)...................... <5 ns
Input and Output Timing Reference Levels.................... 1.5V
Note
5. These parameters are guaranteed by design and are not tested.
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STK22C48
AC Switching Characteristics
SRAM Read Cycle
Parameter
25 ns
45 ns
Description
Unit
Cypress
Alt
Min
Max
Min
Max
Parameter
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
Chip Enable Access Time
Read Cycle Time
25
45
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ACE
ELQV
t
25
45
RC
AA
AVAV, ELEH
[7]
Address Access Time
25
10
45
20
AVQV
Output Enable to Data Valid
Output Hold After Address Change
Chip Enable to Output Active
Chip Disable to Output Inactive
Output Enable to Output Active
Output Disable to Output Inactive
Chip Enable to Power Active
Chip Disable to Power Standby
DOE
OHA
GLQV
5
5
5
5
AXQX
[8]
[8]
LZCE
HZCE
LZOE
HZOE
ELQX
10
10
25
15
15
45
EHQZ
0
0
0
0
GLQX
GHQZ
PU
ELICCH
EHICCL
PD
Switching Waveforms
Figure 7. SRAM Read Cycle 1: Address Controlled
W5&
$''5(66
W$$
W2+$
'4ꢀꢊ'$7$ꢀ287ꢋ
'$7$ꢀ9$/,'
[6]
Figure 8. SRAM Read Cycle 2: CE and OE Controlled
W5&
$''5(66
&(
W$&(
W3'
W+=&(
W/=&(
2(
W+=2(
W'2(
W/=2(
'4ꢀꢊ'$7$ꢀ287ꢋ
'$7$ꢀ9$/,'
$&7,9(
W38
67$1'%<
,&&
Notes
6. WE and HSB must be High during SRAM Read cycles.
7. Device is continuously selected with CE and OE both Low.
8. Measured ±200 mV from steady state output voltage.
Document Number: 001-51000 Rev. **
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STK22C48
SRAM Write Cycle
Parameter
25 ns
45 ns
Description
Write Cycle Time
Unit
Cypress
Alt
Min
Max
Min
Max
Parameter
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
25
20
20
10
0
45
30
30
15
0
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
WC
AVAV
t
Write Pulse Width
PWE
SCE
SD
WLWH, WLEH
t
Chip Enable To End of Write
Data Setup to End of Write
Data Hold After End of Write
Address Setup to End of Write
Address Setup to Start of Write
Address Hold After End of Write
Write Enable to Output Disable
Output Active After End of Write
ELWH, ELEH
t
DVWH, DVEH
t
HD
WHDX, EHDX
t
20
0
30
0
AW
AVWH, AVEH
t
SA
AVWL, AVEL
t
0
0
HA
WHAX, EHAX
10
14
HZWE
LZWE
WLQZ
WHQX
5
5
Switching Waveforms
Figure 9. SRAM Write Cycle 1: WE Controlled
tWC
ADDRESS
CE
tHA
tSCE
tAW
tSA
tPWE
WE
tHD
tSD
DATA VALID
DATA IN
tHZWE
tLZWE
HIGH IMPEDANCE
PREVIOUS DATA
DATA OUT
Figure 10. SRAM Write Cycle 2: CE Controlled
tWC
ADDRESS
tHA
tSCE
tSA
CE
WE
tAW
tPWE
tSD
tHD
DATA IN
DATA VALID
HIGH IMPEDANCE
DATA OUT
Notes
9. If WE is Low when CE goes Low, the outputs remain in the high impedance state.
10. HSB must be high during SRAM Write cycles.
11.
CE or WE must be greater than V during address transitions.
IH
Document Number: 001-51000 Rev. **
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STK22C48
AutoStore or Power Up RECALL
STK22C48
Max
Parameter
Alt
Description
Unit
Min
t
t
t
t
t
t
Power up RECALL Duration
STORE Cycle Duration
550
10
μs
ms
μs
V
HRECALL
RESTORE
HLHZ
STORE
DELAY
t
Time Allowed to Complete SRAM Cycle
Low Voltage Trigger Level
Low Voltage Reset Level
1
HLQZ , BLQZ
V
V
4.0
4.5
3.6
300
SWITCH
V
RESET
t
Low Voltage Trigger (V
) to HSB Low
ns
VSBL
SWITCH
Switching Waveform
Figure 11. AutoStore/Power Up RECALL
WE
Notes
12. t
starts from the time V rises above V
.
SWITCH
HRECALL
CC
13. CE and OE low for output behavior.
14. CE and OE low and WE high for output behavior.
15. HSB is asserted low for 1us when V
takes place.
drops through V
. If an SRAM Write has not taken place since the last nonvolatile cycle, HSB is released and no store
CAP
SWITCH
Document Number: 001-51000 Rev. **
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STK22C48
Hardware STORE Cycle
STK22C48
Min Max
Parameter
Alt
Description
Unit
t
t
t
t
t
t
Hardware STORE High to Inhibit Off
Hardware STORE Pulse Width
700
ns
ns
ns
DHSB
RECOVER, HHQX
15
PHSB
HLBL
HLHX
Hardware STORE Low to STORE Busy
300
Switching Waveform
Figure 12. Hardware STORE Cycle
Note
16. t
is only applicable after t
is complete.
STORE
DHSB
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STK22C48
STK22C48 - N F 45 I TR
Packaging Option:
TR = Tape and Reel
Blank = Tube
Temperature Range:
Blank - Commercial (0 to 70°C)
I - Industrial (-40 to 85°C)
Speed:
25 - 25 ns
45 - 45 ns
Lead Finish
F = 100% Sn (Matte Tin)
Package:
N = Plastic 28-pin 300 mil SOIC
S = Plastic 28-pin 330 mil SOIC
Ordering Information
Speed (ns)
Ordering Code
STK22C48-NF25TR
STK22C48-NF25
Package Diagram
51-85026
51-85026
51-85058
51-85058
51-85026
51-85026
51-85058
51-85058
51-85026
51-85026
51-85058
51-85058
51-85026
51-85026
51-85058
51-85058
Package Type
28-pin SOIC (300 mil)
28-pin SOIC (300 mil)
28-pin SOIC (330 mil)
28-pin SOIC (330 mil)
28-pin SOIC (300 mil)
28-pin SOIC (300 mil)
28-pin SOIC (330 mil)
28-pin SOIC (330 mil)
28-pin SOIC (300 mil)
28-pin SOIC (300 mil)
28-pin SOIC (330 mil)
28-pin SOIC (330 mil)
28-pin SOIC (300 mil)
28-pin SOIC (300 mil)
28-pin SOIC (330 mil)
28-pin SOIC (330 mil)
Operating Range
25
Commercial
STK22C48-SF25TR
STK22C48-SF25
STK22C48-NF25ITR
STK22C48-NF25I
STK22C48-SF25ITR
STK22C48-SF25I
STK22C48-NF45TR
STK22C48-NF45
Industrial
45
Commercial
Industrial
STK22C48-SF45TR
STK22C48-SF45
STK22C48-NF45ITR
STK22C48-NF45I
STK22C48-SF45ITR
STK22C48-SF45I
All parts are Pb-free. The above table contains Final information. Please contact your local Cypress sales representative for availability of these parts
Document Number: 001-51000 Rev. **
Page 12 of 14
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STK22C48
Package Diagrams
Figure 13. 28-Pin (300 mil) SOIC (51-85026)
NOTE :
PIN 1 ID
1. JEDEC STD REF MO-119
2. BODY LENGTH DIMENSION DOES NOT INCLUDE MOLD PROTRUSION/END FLASH,BUT
DOES INCLUDE MOLD MISMATCH AND ARE MEASURED AT THE MOLD PARTING LINE.
MOLD PROTRUSION/END FLASH SHALL NOT EXCEED 0.010 in (0.254 mm) PER SIDE
14
1
MIN.
3. DIMENSIONS IN INCHES
MAX.
0.291[7.39]
0.300[7.62]
4. PACKAGE WEIGHT 0.85gms
*
0.394[10.01]
0.419[10.64]
PART #
15
28
0.026[0.66]
0.032[0.81]
S28.3 STANDARD PKG.
SZ28.3 LEAD FREE PKG.
SEATING PLANE
0.697[17.70]
0.713[18.11]
0.092[2.33]
0.105[2.67]
*
0.004[0.10]
0.0091[0.23]
0.015[0.38]
0.050[1.27]
0.013[0.33]
0.019[0.48]
*
0.004[0.10]
0.0125[3.17]
0.050[1.27]
TYP.
0.0118[0.30]
51-85026-*D
Figure 14. 28-Pin (330 mil) SOIC (51-85058)
51-85058-*A
Document Number: 001-51000 Rev. **
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STK22C48
Document History Page
Document Title: STK22C48 16 Kbit (2K x 8) AutoStore nvSRAM
Document Number: 001-51000
Orig. of
Change
Submission
Date
Rev.
ECN No.
Description of Change
**
2625139
GVCH/PYRS
01/30/09
New data sheet
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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
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Use may be limited by and subject to the applicable Cypress software license agreement.
Document Number: 001-51000 Rev. **
Revised January 30, 2009
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holders.
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