STK14C88
32K x 8 AutoStore™ nvSRAM
QuantumTrap™ CMOS
Nonvolatile Static RAM
FEATURES
DESCRIPTION
• 25ns, 35ns and 45ns Access Times
• “Hands-off” Automatic STORE with External
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 elements (Commercial/Industrial)
• 100-Year Data Retention in nonvolatile elements (Commercial/Industrial)
• Single 5V + 10% Operation
• Commercial, Industrial and Military Temperatures
• 32-Pin SOIC, DIP and LCC Packages
The Simtek STK14C88 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, nonvolatile data resides in the 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. Initiation of STORE and RECALL cycles can
also be software controlled by entering specific read
sequences. A hardware STORE may be initiated with
the HSB pin.
BLOCK DIAGRAM
PIN CONFIGURATIONS
VCCX
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
INPUT BUFFERS
A5
A6
A7
A8
A9
A11
A12
A13
A14
ROW DECODER
Quantum Trap
512 x 512
VCAP
A14
A12
A7
A6
A5
A4
A3
NC
A2
A1
A0
DQ0
DQ1
DQ2
VSS
VCAP
POWER
CONTROL
STORE
STATIC RAM
ARRAY
512 x 512
RECALL
STORE/
RECALL
CONTROL
HSB
32 - LCC
SOFTWARE
DETECT
COLUMN I/O
A0 - A13
1
32
2
31
3
30
4
29
5
28
6
27
7
26
8
25
9
24
10
23
11
22
12
21
13
20
14
19
15
18
16
17
VCCX
HSB
W
A13
A8
A9
A11
G
NC
A10
E
DQ7
DQ6
DQ5
DQ4
DQ3
32 - DIP
32 - SOIC
PIN NAMES
A0 - A14
E
W
September 2003
1
Chip Enable
W
Write Enable
G
Output Enable
HSB
Hardware Store Busy (I/O)
VCCX
Power (+ 5V)
VCAP
Capacitor
VSS
G
Data In/Out
E
A0 A1 A2 A3 A4 A10
Address Inputs
DQ0 -DQ7
COLUMN DEC
Ground
Document Control # ML0014 rev 0.1
