STK16CA8
128K x 8
AutoStorePlus™
nvSRAM
QuantumTrap™
CMOS
Nonvolatile Static RAM
Preliminary
FEATURES
• 25ns, 35ns and 45ns Access Times
• Directly Replaces 128K x 8 Static RAM, Bat-
tery-Backed RAM or EEPROM
• Transparent Data Save on Power Down
•
STORE
to
QuantumTrap™
Nonvolatile Ele-
ments is Initiated by Software or
AutoStore-
Plus™on
Power Down
•
RECALL
to SRAM Initiated by Software or
Power Restore
• 5mA Typical I
CC
at 200ns Cycle Time
• Unlimited READ and WRITE Cycles to SRAM
• 100-Year Data Retention to Quantum Trap
• Single 3V +20%, -10% Operation
• Commercial and Industrial Temperatures
• 32-Pin DIP Package
DESCRIPTION
The Simtek STK16CA8 is a fast static
RAM
with a
nonvolatile element in each static memory cell. The
embedded nonvolatile elements incorporate
Simtek’s
QuantumTrap™
technology producing the
world’s most reliable nonvolatile memory. The
SRAM
provides unlimited read and write cycles, while inde-
pendent, nonvolatile data resides in the nonvolatile
elements. Data transfers from the
SRAM
to the non-
volatile elements (the
STORE
operation) can take
place automatically on power down or under soft-
ware control. An internal capacitor guarantees the
STORE
operation, even under extreme power-down
slew rates or loss of power from “hot swapping”.
Transfers from the nonvolatile elements to the
SRAM
(the
RECALL
operation) take place automatically on
restoration of power. Initiation of
STORE
and
RECALL
cycles can also be controlled by entering control
sequences on the
SRAM
inputs. The STK16CA8 is
pin-compatible with 128k x 8
SRAMs
and battery-
backed
SRAMs
, allowing direct substitution while
providing superior performance.
BLOCK DIAGRAM
V
CC
Quantum Trap
1024 x 1024
ROW DECODER
PIN CONFIGURATIONS
NC
A
16
A
14
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
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
A
5
A
6
A
7
A
8
A
9
A
12
A
13
A
14
A
15
A
16
DQ
0
DQ
1
DQ
2
DQ
3
DQ
4
DQ
5
DQ
6
DQ
7
POWER
CONTROL
STORE
STATIC RAM
ARRAY
1024 x 1024
RECALL
STORE/
RECALL
CONTROL
V
CC
A
15
NC
W
A
13
A
8
A
9
A
11
G
A
10
E
DQ
7
DQ
6
DQ
5
DQ
4
DQ
3
INPUT BUFFERS
COLUMN I/O
COLUMN DEC
SOFTWARE
DETECT
A
0
- A
15
PIN NAMES
A
0
- A
16
W
DQ
0
- DQ
7
Address Inputs
Write Enable
Data In/Out
Chip Enable
Output Enable
Power (+ 3V)
Ground
A
0
A
1
A
2
A
3
A
4
A
10
A
11
G
E
W
E
G
V
CC
V
SS
September 2003
1
Document Control # ML0023 rev 0.1
SIMTEK [ SIMTEK CORPORATION ]
