STK11C48
2K x 8 nvSRAM
QuantumTrap™ CMOS
Nonvolatile Static RAM
FEATURES
DESCRIPTION
• 20ns, 25ns, 35ns and 45ns Access Times
• STORE to EEPROM Initiated by Software
The Simtek STK11C48 is a fast static RAM with a
nonvolatile, electrically erasable PROM element
incorporated in each static memory cell. The SRAM
can be read and written an unlimited number of
times, while independent, nonvolatile data resides in
the EEPROM. Data transfers from the SRAM to the
EEPROM (the STORE operation), or from EEPROM to
SRAM (the RECALL operation), take place using a
software sequence. Transfers from the EEPROM to
the SRAM (the RECALL operation) also take place
automatically on restoration of power.
• 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 EEPROM
• 100-Year Data Retention in EEPROM
• Commercial and Industrial Temperatures
• 28-Pin 300 mil PDIP, 300 mil SOIC and
350 mil SOIC Packages
BLOCK DIAGRAM
PIN CONFIGURATIONS
NC
NC
1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
CC
W
NC
EEPROM ARRAY
32 x 512
2
3
A
A
7
4
A
6
5
4
3
8
A5
A
A
A
A
A
9
NC
G
STORE
5
STORE/
RECALL
CONTROL
6
A6
A7
A8
A9
7
STATIC RAM
ARRAY
8
RECALL
A
2
10
A
9
E
1
0
32 x 512
10
11
12
13
14
A
DQ
DQ
7
6
5
DQ
0
28 - 300 PDIP
28 - 300 SOIC
28 - 350 SOIC
DQ
DQ
1
2
DQ
DQ
DQ
4
3
SOFTWARE
DETECT
A0 - A10
V
SS
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
COLUMN I/O
PIN NAMES
COLUMN DEC
A
- A
Address Inputs
Write Enable
Data In/Out
Chip Enable
Output Enable
Power (+ 5V)
Ground
0
10
W
A0 A1 A2 A3 A4 A10
DQ - DQ
0
G
7
E
E
G
W
V
V
CC
SS
July 1999
3-11
SIMTEK [ SIMTEK CORPORATION ]
