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STK12C68-5K40M Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers

Part No. STK12C68-5K40M
Description  CMOS NV SRAM 8K X 8 AUTOSTORE NONVOLATILE STATIC RAM
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STK12C68-M
4-53
STK12C68-M
CMOS nvSRAM
8K x 8
AutoStoreâ„¢
Nonvolatile Static RAM
MIL-STD-883 / SMD # 5962-94599
PIN CONFIGURATIONS
LOGIC BLOCK DIAGRAM
A
A
A
A
A
A
4
5
6
7
8
EEPROM ARRAY
256 x 256
STORE
RECALL
STATIC RAM
ARRAY
256 x 256
STORE/
RECALL
CONTROL
AA
A
A
A
0
12
10
12
DQ
DQ
DQ
DQ
DQ
DQ
DQ
DQ
0
1
2
3
4
5
6
7
G
E
W
COLUMN I/O
COLUMN DECODER
AA
011
A3
A
9
12
HSB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
A
A
A
A
A
A
A
A
DQ
DQ
DQ
DQ
DQ
DQ
DQ
DQ
V
V
W
HSB
A
A
A
G
A
E
SS
7
6
5
4
3
2
1
0
0
1
2
8
9
10
7
6
5
4
3
CAP
A 12
11
CCX
28 - LCC
28 - 300 C-DIP
PIN NAMES
A
0 - A12
Address Inputs
W
Write Enable
DQ0 - DQ7
Data In/Out
E
Chip Enable
G
Output Enable
VCCX
Power (+5V)
V
SS
Ground
VCAP
Capacitor
HSB
Hardware Store/Busy
FEATURES
• 40, 45 and 55ns Access Times
• 15 mA ICC at 200ns Access Speed
• Automatic STORE to EEPROM on Power Down
• Hardware or Software initiated STORE to
EEPROM
• Automatic STORE Timing
• 100,000 STORE cycles to EEPROM
• 10 year data retention in EEPROM
• Automatic RECALL on Power Up
• Software initiated RECALL from EEPROM
• Unlimited RECALL cycles from EEPROM
• Single 5V
±10% Operation
• Available in multiple standard packages
A
A
A
A
A
A
A
A
A
A
DQ
DQ
DQ
G
A
E
DQ
HSB
6
5
4
3
2
1
0
0
1
8
9
11
10
7
6
TOP VIEW
4
5
6
7
8
9
10
11
12
32
1
28 27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
DESCRIPTION
The Simtek STK12C68-M is a fast static RAM (40, 45
and 55ns), with a nonvolatile EEPROM element incor-
porated in each static memory cell. The SRAM can be
read and written an unlimited number of times, while
independent nonvolatile data resides in EEPROM.
Data transfers from the SRAM to the EEPROM (the
STORE operation) take place automatically upon power
down using charge stored in an external 100
µF
capacitor. Transfers from the EEPROM to the SRAM
(the
RECALL operation) take place automatically on
power up. Software sequences may also be used to
initiate both
STORE and RECALL operations.
A
STORE can also be initiated via a single pin.
The STK12C68-M is available in the following pack-
ages: a 28-pin 300 mil ceramic DIP and 28-pad LCC.




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