Cypress Semiconductor STK22C48 Specification Sheet

Features
■
25 ns and 45 ns access times
■
Hands off automatic STORE on power down with external 68
µF capacitor
■ STORE to QuantumTrap™ nonvolatile elements is initiated by
software, hardware, or AutoStore™ on power down
■ RECALL to SRAM initiated by software or power up
■ Unlimited Read, Write, and Recall cycles
■ 1,000,000 STORE cycles to QuantumTrap
■ 100 year data retention to QuantumTrap
■
Single 5V+10% operation
■ Commercial and industrial temperatures
■ 28-pin 300 mil and (330 mil) SOIC package
■ RoHS compliance
Logic Block Diagram
A
5
A
6
A
7
A
8
A
9
DQ
0
DQ
1
DQ
2
DQ
3
DQ
4
DQ
5
DQ
6
DQ
7
Cypress Semiconductor Corporation
Document Number: 001-51000 Rev. **
16 Kbit (2K x 8) AutoStore nvSRAM
Quantum Trap
32 X 512
STORE
RECALL
STATIC RAM
ARRAY
32 X 512
COLUMN I/O
COLUMN DEC
A A A A A A
0 1 4
2 3 10
• 198 Champion Court

Functional Description

The Cypress STK22C48 is a fast static RAM with a nonvolatile
element in each memory cell. The embedded nonvolatile
elements incorporate QuantumTrap technology producing the
world's most reliable nonvolatile memory. The SRAM provides
unlimited read and write cycles, while independent nonvolatile
data resides in the highly reliable QuantumTrap cell. Data
transfers from the SRAM to the nonvolatile elements (the
STORE operation) takes place automatically at power down. On
power up, data is restored to the SRAM (the RECALL operation)
from the nonvolatile memory. A hardware STORE is initiated with
the HSB pin.
V V
CC CAP
POWER
CONTROL
STORE/
RECALL
CONTROL
,
• San Jose CA 95134-1709
STK22C48
HSB
OE
CE
WE
• 408-943-2600
Revised January 30, 2009
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