STK12C68
STK12C68-M SMD#5962-94599
8K x 8 AutoStore™ nvSRAM
QuantumTrap™ CMOS
Nonvolatile Static RAM
FEATURES
DESCRIPTION
• 25ns, 45ns and 55ns Access Times
The Simtek STK12C68 is a fast static RAM with a
• “Hands-off” Automatic STORE with External
68μF Capacitor on Power Down
• STORE to Nonvolatile Elements Initiated by
Hardware, Software or AutoStore™ on Power
Down
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.
• 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)
• Commercial, Industrial and Military Tempera-
tures
• 28-Pin SOIC, DIP and LCC Packages
BLOCK DIAGRAM
PIN CONFIGURATIONS
VCCX
VCAP
1
V
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
CCX
W
HSB
CAP
2
A
12
3
A
7
4
POWER
CONTROL
A
A
6
8
QUANTUM TRAP
128 x 512
5
A
A
9
A
11
5
6
A
4
7
A
G
A
3
2
8
A5
A6
A
10
9
A
E
1
STORE
10
11
12
13
14
A
DQ
0
7
STORE/
RECALL
CONTROL
DQ
DQ
DQ
V
DQ
6
DQ
5
DQ
4
0
HSB
A7
1
STATIC RAM
ARRAY
2
RECALL
DQ
A8
SS
3
128 x 512
A9
28 - LCC
28 - DIP
28 - SOIC
A11
A12
SOFTWARE
DETECT
A0 - A12
PIN NAMES
DQ0
DQ1
DQ2
COLUMN I/O
A - A
Address Inputs
0
12
COLUMN DEC
DQ -DQ
0
Data In/Out
7
DQ3
DQ4
DQ5
DQ6
DQ7
E
Chip Enable
Write Enable
Output Enable
W
A0 A1 A2 A3 A4 A10
G
G
HSB
Hardware Store Busy (I/O)
Power (+ 5V)
Capacitor
E
V
V
V
CCX
CAP
SS
W
Ground
March 2006
1
Document Control # ML0008 rev 0.5