CY14B256KA-SP45XI(2009) 查看數據表（PDF） - Cypress Semiconductor

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CY14B256KA-SP45XI
(Rev.:2009)

256 Kbit (32K x 8) nvSRAM with Real Time Clock

Cypress Semiconductor 

CY14B256KA

Contents

Features ...............................................................................1

Functional Description .......................................................1

Contents ..............................................................................2

Pinouts ................................................................................3

Pin Definitions ....................................................................3

Device Operation ................................................................4

SRAM Read .........................................................................4

SRAM Write .........................................................................4

AutoStore Operation ..........................................................4

Hardware STORE (HSB) Operation ...................................5

Hardware RECALL (Power Up) ..........................................5

Software STORE .................................................................5

Software RECALL ...............................................................5

Preventing AutoStore .........................................................6

Best Practices .....................................................................7

Data Protection ...................................................................8

Noise Considerations .........................................................8

Real Time Clock Operation ................................................8

nvTIME Operation .........................................................8

Clock Operations ...........................................................8

Reading the Clock .........................................................8

Setting the Clock ...........................................................8

Backup Power ...............................................................8

Stopping and Starting the Oscillator ..............................9

Calibrating the Clock ..................................................... 9

Alarm ............................................................................. 9

Watchdog Timer ............................................................ 9

Power Monitor .............................................................10

Interrupts .....................................................................10

Flags Register .............................................................11

Maximum Ratings .............................................................16

Operating Range ...............................................................16

DC Electrical Characteristics ..........................................16

Capacitance ......................................................................17

Thermal Resistance ..........................................................17

AC Test Conditions ..........................................................17

RTC Characteristics .........................................................17

AC Switching Characteristics .........................................18

AutoStore/Power Up RECALL .........................................20

Software Controlled STORE/RECALL Cycle ..................21

Hardware STORE Cycle ...................................................22

Truth Table For SRAM Operations ..................................23

Ordering Information ........................................................24

Package Diagram ..............................................................25

Document History Page ...................................................26

Sales, Solutions, and Legal Information ........................26

Worldwide Sales and Design Support .........................26

Products ......................................................................26

Document #: 001-55720 Rev. *A

Page 2 of 26

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