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Cypress Semiconductor Electronic Components Datasheet



CY14E256LA

256-Kbit (32 K x 8) nvSRAM



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CY14E256LA pdf
CY14E256LA
256-Kbit (32 K × 8) nvSRAM
256-Kbit (32 K × 8) nvSRAM
Features
25 ns and 45 ns access times
Internally organized as 32 K × 8 (CY14E256LA)
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 5 V + 10% operation
Industrial temperature
44-pin thin small-outline package (TSOP) Type II and 32-pin
small-outline integrated circuit (SOIC) package
Pb-free and restriction of hazardous substances (RoHS)
compliant
Functional Description
The Cypress CY14E256LA is a fast static RAM, with a
nonvolatile element in each memory cell. The memory is
organized as 32 KB. 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
operations are also available under software control.
For a complete list of related documentation, click here.
Logic Block Diagram
A5
A6
A7
A8
A9
A 11
A 12
A 13
A 14
DQ 0
DQ 1
DQ 2
DQ 3
DQ 4
DQ 5
DQ 6
DQ 7
QuantumTrap
512 X 512
STORE
STATIC RAM
ARRAY
512 X 512
RECALL
COLUMN I/O
COLUMN DEC
A0 A1 A2 A3 A4 A10
VCC
VCAP
POWER
CONTROL
STORE/
RECALL
CONTROL
HSB
SOFTWARE
DETECT
-A13 A0
OE
CE
WE
Cypress Semiconductor Corporation • 198 Champion Court
Document Number: 001-54952 Rev. *K
• San Jose, CA 95134-1709 • 408-943-2600
Revised November 14, 2014



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CY14E256LA pdf
CY14E256LA
Contents
Pinouts .............................................................................. 3
Pin Definitions .................................................................. 3
Device Operation .............................................................. 4
SRAM Read ................................................................ 4
SRAM Write ................................................................. 4
AutoStore Operation .................................................... 4
Hardware STORE Operation ....................................... 4
Hardware RECALL (Power-up) ................................... 5
Software STORE ......................................................... 5
Software RECALL ....................................................... 5
Preventing AutoStore .................................................. 6
Data Protection ............................................................ 6
Maximum Ratings ............................................................. 7
Operating Range ............................................................... 7
DC Electrical Characteristics .......................................... 7
Data Retention and Endurance ....................................... 8
Capacitance ...................................................................... 8
Thermal Resistance .......................................................... 8
AC Test Loads .................................................................. 9
AC Test Conditions .......................................................... 9
AC Switching Characteristics ....................................... 10
SRAM Read Cycle .................................................... 10
SRAM Write Cycle ..................................................... 10
Switching Waveforms .................................................... 10
AutoStore/Power-up RECALL ....................................... 12
Switching Waveforms .................................................... 12
Software Controlled STORE/RECALL Cycle ................ 13
Switching Waveforms .................................................... 13
Hardware STORE Cycle ................................................. 14
Switching Waveforms .................................................... 14
Truth Table For SRAM Operations ................................ 15
Ordering Information ...................................................... 15
Ordering Code Definitions ......................................... 15
Package Diagrams .......................................................... 16
Acronyms ........................................................................ 17
Document Conventions ................................................. 17
Units of Measure ....................................................... 17
Document History Page ................................................. 18
Sales, Solutions, and Legal Information ...................... 19
Worldwide Sales and Design Support ....................... 19
Products .................................................................... 19
PSoC Solutions ......................................................... 19
Document Number: 001-54952 Rev. *K
Page 2 of 19



Part Number CY14E256LA
Description 256-Kbit (32 K x 8) nvSRAM
Maker Cypress Semiconductor - Cypress Semiconductor
Total Page 19 Pages
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