STK11C68-M
STK11C68-M
CMOS nvSRAM
High Performance
8K x 8 Nonvolatile Static RAM
MIL-STD-883/SMD # 5962-92324
DESCRIPTION
FEATURES
The Simtek STK11C68-M is a fast static RAM (35, 45
and55ns),withanonvolatileelectrically-erasablePROM
• 35, 45 and 55ns Access Times
• 17, 20 and 25ns Output Enable Access
• Unlimited Read and Write to SRAM
• Software STORE Initiation
(EEPROM)elementincorporatedineachstaticmemory
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 (STORE), or from the EEPROM to the
SRAM (RECALL) are initiated through software se-
quences. It combines the high performance and ease
of use of a fast SRAM with nonvolatile data integrity.
• Automatic STORE Timing
• 100,000 STORE cycles to EEPROM
• 10 year data retention in EEPROM
• Automatic RECALL on Power Up
• Software RECALL Initiation
The STK11C68-M is pin compatible with industry stan-
dard SRAMs and is available in a 28-pin 300 mil
ceramicDIPor28-padLCCpackage. Commercialand
industrial devices are also available.
• Unlimited RECALL cycles from EEPROM
• Single 5V ± 10% Operation
• Available in multiple standard packages
LOGIC BLOCK DIAGRAM
PIN CONFIGURATIONS
1
28
NC
V
CC
2
3
27
26
W
A
A
EEPROM ARRAY
256 x 256
12
3
2
28 27
26
1
NC
4
5
7
6
5
4
A
A
NC
6
5
4
25
24
4
5
A
A
A
A
A
8
25
24
23
22
21
A
8
A3
A
A
6
9
A
A
A
A
A
9
STORE
23
22
6
7
11
7
A4
A
3
2
1
0
11
G
8
G
A
E
3
TOP VIEW
A5
RECALL
STATIC RAM
8
9
21
20
A
A
A
E
9
10
10
2
1
0
0
10
20
19
18
A6
A
DQ
DQ
ARRAY
10
11
19
18
A
DQ
DQ
DQ
DQ
DQ
7
6
11
12
DQ
DQ
0
1
7
6
A7
DQ
A 0
A12
256 x 256
13 14 15 16 17
17
16
15
12
13
14
DQ
DQ
V
A8
A9
5
4
1
2
STORE/
3
SS
RECALL
CONTROL
A
12
28 - LCC
28 - 300 C-DIP
DQ0
COLUMN I/O
PIN NAMES
DQ1
A
- A
Address Inputs
DQ2
0
12
COLUMN DECODER
W
Write Enable
Data In/Out
Chip Enable
Output Enable
Power (+5V)
Ground
DQ3
DQ - DQ
0
7
DQ4
DQ5
E
G
V
A0
A1
A2
A
A11
10
G
DQ6
DQ7
CC
SS
V
E
W
4-31
SIMTEK [ SIMTEK CORPORATION ]
