STK11C68
STK11C68-M SMD#5962-92324
8K x 8 nvSRAM
QuantumTrap™ CMOS
Nonvolatile Static RAM
FEATURES
DESCRIPTION
• 25ns, 35ns, 45ns and 55ns Access Times
The Simtek STK11C68 is a fast static RAM with a
nonvolatile element incorporated in each static
memory cell. The SRAM can be read and written an
unlimited number of times, while independent non-
volatile data resides in the Nonvolatile Elements.
Data transfers from the SRAM to the Nonvolatile Ele-
ments (the STORE operation), or from Nonvolatile
Elements to SRAM (the RECALL operation), take
place using a software sequence. Transfers from the
Nonvolatile Elements to the SRAM (the RECALL
operation) also take place automatically on restora-
tion of power.
• STORE to Nonvolatile Elements Initiated by
Software
• RECALL to SRAM Initiated by Software or
Power Restore
• 10mA Typical ICC at 200ns Cycle Time
• Unlimited READ, WRITE and RECALL Cycles
• 1,000,000 STORE Cycles to Nonvolatile Ele-
ments (Industrial/Commercial)
• 100-Year Data Retention (Industrial/Commer-
cial)
• Commercial, Industrial and Military Tempera-
tures
• 28-Pin DIP, SOIC and LCC Packages
The STK11C68 is pin-compatible with industry-
standard SRAMs. MIL-STD-883 device is also
available (STK11C68-M).
BLOCK DIAGRAM
PIN CONFIGURATIONS
NC
A12
A7
1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VCC
W
QUANTUM TRAP
128 x 512
2
3
4
5
6
7
8
9
NC
A8
A6
A5
A6
A5
A9
STORE
A4
A11
G
A10
E
STORE/
RECALL
A3
A7
A8
A9
A2
STATIC RAM
ARRAY
CONTROL
A1
RECALL
10
11
12
13
14
A0
DQ7
DQ6
DQ5
DQ4
DQ3
128 x 512
DQ0
DQ1
DQ2
VSS
A11
A12
SOFTWARE
DETECT
A
- A
12
0
28 - LCC
28 - DIP
28 - SOIC
DQ
DQ
DQ
0
1
2
COLUMN I/O
PIN NAMES
COLUMN DEC
DQ
A
- A
Address Inputs
Write Enable
Data In/Out
Chip Enable
Output Enable
Power (+ 5V)
Ground
3
4
0
12
DQ
W
DQ
DQ
DQ
5
6
7
A
A A
A A
1 4
2 3
A
0
10
G
DQ - DQ
0
7
E
E
W
G
V
V
CC
SS
September 2003
1
Document Control # ML0007 rev 0.1
SIMTEK [ SIMTEK CORPORATION ]
