STK14C88-3
32K x 8 AutoStore™ nvSRAM
QuantumTrap™ CMOS
Nonvolatile Static RAM
FEATURES
DESCRIPTION
The Simtek STK14C88-3 is a fast static RAM with a
• 35ns, 45ns and 55ns Access Times
• “Hands-off” Automatic STORE with External
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 nonvolatile elements. Data
transfers from the SRAM to the nonvolatile elements
(the STORE operation) can take place automatically
on power down. A 68µF or larger capacitor tied from
VCAP to ground guarantees the STORE operation,
regardless of power-down slew rate 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. Initia-
tion of STORE and RECALL cycles can also be soft-
ware controlled by entering specific read
sequences. A hardware STORE may be initiated with
the HSB pin.
68µF Capacitor on Power Down
• STORE to nonvolatile elements Initiated by
Hardware, Software or AutoStore™
• 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 (Commercial/Industrial)
• 100-Year Data Retention in nonvolatile ele-
ments (Commercial/Industrial)
• Single 3.3V + 0.3V Operation
• Commercial and Industrial Temperatures
• 32-Pin SOIC and DIP Packages
PIN CONFIGURATIONS
BLOCK DIAGRAM
V
V
CAP
CCX
Quantum Trap
512 x 512
POWER
VCCX
HSB
W
A13
A8
A9
A11
G
NC
A10
E
DQ7
DQ6
DQ5
DQ4
DQ3
VCAP
A14
A12
A7
1
2
3
4
5
6
7
8
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
CONTROL
A5
A6
STORE
A7
STORE/
RECALL
A8
STATIC RAM
HSB
RECALL
A9
ARRAY
CONTROL
A11
A12
A13
A14
512 x 512
A6
A5
A4
SOFTWARE
DETECT
A
- A
13
0
DQ
0
A3
COLUMN I/O
DQ
1
NC
A2
9
COLUMN DEC
DQ
2
DQ
3
10
11
12
13
14
15
16
DQ
4
A1
DQ
5
A
A A A A A
1 2 3 4 10
0
DQ
G
6
DQ
A0
7
DQ0
DQ1
DQ2
VSS
E
W
32 - DIP
32 - SOIC
48 - SSOP
(not to scale)
PIN NAMES
A
- A
DQ -DQ
E
W
G
HSB
V
V
V
0
14
0
7
CCX
CAP
SS
Address
Inputs
Data In/Out
Chip
Enable
Write
Enable
Output
Enable
Hardware
Store
Busy (I/O)
Power
(+ 3.3V)
Capacitor
Ground
November 2003
1
Document Control # ML0015 rev 0.3
SIMTEK [ SIMTEK CORPORATION ]
