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| STK12C68-C20 Datasheet, PDF (1/12 Pages) List of Unclassifed Manufacturers – 8k x 8 AUTOSTORE NVSRAM QUANTUM TRAP CMOS NONVOLATILE STATIC RAM | |||
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STK12C68
8K x 8 AutoStore⢠nvSRAM
QuantumTrap⢠CMOS
Nonvolatile Static RAM
FEATURES
⢠20ns, 25ns, 35ns and 45ns Access Times
⢠âHands-offâ Automatic STORE with External
68µF Capacitor on Power Down
⢠STORE to EEPROM Initiated by Hardware,
Software or AutoStore⢠on Power Down
⢠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
⢠Single 5V + 10% Operation
⢠Not Sensitive to Power On/Off Ramp Rates
⢠No Data Loss from Undershoot
⢠Commercial and Industrial Temperatures
⢠28-Pin SOIC and DIP Packages
DESCRIPTION
The Simtek STK12C68 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
EEPROM. Data transfers from the SRAM to the
EEPROM (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 âhot swappingâ. Transfers
from the EEPROM to the SRAM (the RECALL opera-
tion) 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
VCCX VCAP
A5
A6
A7
A8
A9
A11
A12
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
EEPROM ARRAY
128 x 512
STATIC RAM
ARRAY
128 x 512
STORE
RECALL
COLUMN I/O
COLUMN DEC
POWER
CONTROL
STORE/
RECALL
CONTROL
SOFTWARE
DETECT
A0 A1 A2 A3 A4 A10
G
E
W
July 1999
4-41
HSB
A0 - A12
PIN CONFIGURATIONS
VCAP 1
A12 2
A7 3
A6 4
A5 5
A4 6
A3 7
A2 8
A1 9
A0 10
DQ0 11
DQ1 12
DQ2 13
VSS 14
28 VCCX
27 W
26 HSB
25 A8
24 A9
23 A11
22 G
21 A10
20 E
19 DQ7
18 DQ6 28 - 300 PDIP
17 DQ5 28 - 600 PDIP
16 DQ4 28 - 350 SOIC
15 DQ3 28 - 300 CDIP
PIN NAMES
A0 - A12
DQ0 -DQ7
E
W
G
HSB
VCCX
VCAP
VSS
Address Inputs
Data In/Out
Chip Enable
Write Enable
Output Enable
Hardware Store Busy (I/O)
Power (+ 5V)
Capacitor
Ground
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