STK11C68
STK11C68-M SMD#5962-92324
8K x 8 nvSRAM
QuantumTrap™
CMOS
Nonvolatile Static RAM
FEATURES
• 25ns, 35ns, 45ns and 55ns Access Times
•
STORE
to Nonvolatile Elements Initiated by
Software
•
RECALL
to SRAM Initiated by Software or
Power Restore
• 10mA Typical I
CC
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
DESCRIPTION
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.
The STK11C68 is pin-compatible with industry-
standard
SRAM
s. MIL-STD-883 device is also
available (STK11C68-M).
BLOCK DIAGRAM
QUANTUM TRAP
128 x 512
PIN CONFIGURATIONS
NC
A
12
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
DQ
0
DQ
1
DQ
2
V
SS
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
A
5
ROW DECODER
A
6
A
7
A
8
A
9
A
11
A
12
DQ
0
DQ
1
DQ
2
DQ
3
DQ
4
DQ
5
DQ
6
DQ
7
STORE
STATIC RAM
ARRAY
128 x 512
RECALL
STORE/
RECALL
CONTROL
SOFTWARE
DETECT
INPUT BUFFERS
COLUMN I/O
COLUMN DEC
A
0
- A
12
V
CC
W
NC
A
8
A
9
A
11
G
A
10
E
DQ
7
DQ
6
DQ
5
DQ
4
DQ
3
28 - LCC
28 - DIP
28 - SOIC
PIN NAMES
A
0
- A
12
Address Inputs
Write Enable
Data In/Out
Chip Enable
Output Enable
Power (+ 5V)
Ground
W
A
0
A
1
A
2
A
3
A
4
A
10
G
E
W
DQ
0
- DQ
7
E
G
V
CC
V
SS
March 2006
1
Document Control # ML0007 rev 0.2
CYPRESS [ CYPRESS SEMICONDUCTOR ]
