Cypress CY14E256L Specification Sheet

Features
■
25 ns, 35 ns, and 45 ns access times
■
Pin compatible with STK14C88
■ 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 temperature
■ 32-pin SOIC and CDIP (300 mil) packages
■ RoHS compliance
Logic Block Diagram
A
5
A
6
A
7
A
8
A
9
A
11
A
12
A
13
A
14
DQ
0
DQ
1
DQ
2
DQ
3
DQ
4
DQ
5
DQ
6
DQ
7
Cypress Semiconductor Corporation
Document Number: 001-06968 Rev. *F

Functional Description

The Cypress CY14E256L 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. Both the STORE and RECALL
operations are also available under software control. A hardware
STORE is initiated with the HSB pin.
Quantum Trap
512 X 512
STORE
RECALL
STATIC RAM
ARRAY
512 X 512
COLUMN I/O
COLUMN DEC
A A A A A
A
0 1 2 3 4 10
• 198 Champion Court
256 Kbit (32K x 8) nvSRAM
V V
CC
CAP
POWER
CONTROL
STORE/
RECALL
CONTROL
SOFTWARE
DETECT
,
• San Jose CA 95134-1709
CY14E256L
HSB
-
A A
13 0
OE
CE
WE
• 408-943-2600
Revised January 30, 2009
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