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Cypress Semiconductor Electronic Components Datasheet



CY14B256LA

256 Kbit (32K x 8) nvSRAM



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CY14B256LA pdf
CY14B256LA
256 Kbit (32K x 8) nvSRAM
Features
25 ns and 45 ns Access Times
Internally Organized as 32K x 8 (CY14B256LA)
Hands off Automatic STORE on Power Down with only a Small
Capacitor
STORE to QuantumTrap Nonvolatile Elements Initiated by
Software, Device Pin, or AutoStore on Power Down
RECALL to SRAM Initiated by Software or Power Up
Infinite Read, Write, and Recall Cycles
1 Million STORE Cycles to QuantumTrap
20 year Data Retention
Single 3V +20% to -10% Operation
Industrial Temperature
44-Pin TSOP - II, 48-Pin SSOP, and 32-Pin SOIC Packages
Pb-free and RoHS Compliance
Functional Description
The Cypress CY14B256LA is a fast static RAM, with a nonvol-
atile element in each memory cell. The memory is organized as
32K bytes of 8 bits each. The embedded nonvolatile elements
incorporate QuantumTrap technology, producing the world’s
most reliable nonvolatile memory. The SRAM provides infinite
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 opera-
tions are also available under software control.
www.DataSheet4U.com
Cypress Semiconductor Corporation • 198 Champion Court
Document Number: 001-54707 Rev. *B
• San Jose, CA 95134-1709 • 408-943-2600
Revised December 08, 2009
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CY14B256LA pdf
CY14B256LA
Contents
Features ...............................................................................1
Functional Description .......................................................1
Contents ..............................................................................2
Pinouts ................................................................................3
Device Operation ................................................................5
SRAM Read .........................................................................5
SRAM Write .........................................................................5
AutoStore Operation ..........................................................5
Hardware STORE Operation ..............................................5
Hardware RECALL (Power Up) ..........................................6
Software STORE .................................................................6
Software RECALL ...............................................................6
Preventing AutoStore .........................................................7
Data Protection ...................................................................7
Noise Considerations .........................................................7
Best Practices .....................................................................8
Maximum Ratings ...............................................................9
Operating Range .................................................................9
DC Electrical Characteristics ............................................ 9
AC Test Conditions ..........................................................10
Data Retention and Endurance .......................................10
Capacitance ......................................................................10
Thermal Resistance ..........................................................10
AC Switching Characteristics .........................................11
AutoStore/Power Up RECALL .........................................13
Software Controlled STORE/RECALL Cycle ..................14
Hardware STORE Cycle ...................................................15
Truth Table For SRAM Operations ..................................16
Part Numbering Nomenclature ........................................16
Ordering Information ........................................................17
Package Diagrams ............................................................18
Document History Page ...................................................20
Sales, Solutions, and Legal Information ........................20
Worldwide Sales and Design Support .........................20
Products ......................................................................20
www.DataSheet4U.com
Document Number: 001-54707 Rev. *B
Page 2
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Part Number CY14B256LA
Description 256 Kbit (32K x 8) nvSRAM
Maker Cypress Semiconductor - Cypress Semiconductor
Total Page 21 Pages
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