Cypress STK14D88 用户手册

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页码 17
STK14D88
32Kx8 AutoStore™ nvSRAM
Cypress Semiconductor Corporation
198 Champion Court
San Jose
,
CA 95134-1709
408-943-2600
Document Number: 001-52037 Rev. **
 Revised March 02, 2009
Features
25, 35, 45 ns Read Access and R/W Cycle Time
Unlimited Read/Write Endurance
Automatic Nonvolatile STORE on Power Loss
Nonvolatile STORE Under Hardware or Software Control
Automatic RECALL to SRAM on Power Up
Unlimited RECALL Cycles
200K STORE Cycles
20-Year Nonvolatile Data Retention
Single 3.0V +20%, -10% Power Supply
Commercial, Industrial Temperatures
Small Footprint SOIC and SSOP Packages (RoHS-Compliant)
Description
The Cypress STK14D88 is a 256Kb fast static RAM with a
nonvolatile Quantum Trap™ storage element included with each
memory cell. 
The SRAM provides fast access and cycle times, ease of use,
and unlimited read and write endurance of a normal SRAM. 
Data transfers automatically to the nonvolatile storage cells
when power loss is detected (the STORE operation). On power
up, data is automatically restored to the SRAM (the RECALL
operation). Both STORE and RECALL operations are also
available under software control.
The Cypress nvSRAM is the first monolithic nonvolatile memory
to offer unlimited writes and reads. It is the highest performance,
most reliable nonvolatile memory available.
  
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COLUMN I/O
COLUMN DEC
STATIC RAM
ARRAY
512 x 512
ROW DECODER
INPUT
 BUFF
ERS
Quantum Trap
512 x 512
STORE/
RECALL
CONTROL
STORE
RECALL
POWER
CONTROL
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DQ
0
DQ
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DQ
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DQ
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DQ
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DQ
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SOFTWARE
DETECT
G
E
W
HSB
V
CCX
V
CAP
A
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Logic Block Diagram