Cypress Semiconductor Perform nvSRAM Especificações descarregar pdf (Página 2)

CY14B256KA

Document Number: 001-55720 Rev. *H Page 2 of 28

Contents

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

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

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

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

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

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

Hardware STORE (HSB) Operation ............................4

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

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

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

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

Data Protection ............................................................6

Real Time Clock Operation .............................................. 7

nvTIME Operation .......................................................7

Clock Operations .........................................................7

Reading the Clock .......................................................7

Setting the Clock .........................................................7

Backup Power .............................................................7

Stopping and Starting the Oscillator ............................ 7

Calibrating the Clock ...................................................8

Alarm ........................................................................... 8

Watchdog Timer ..........................................................8

Power Monitor ............................................................. 9

Interrupts ..................................................................... 9

Interrupt Register .........................................................9

Flags Register ............................................................. 9

RTC External Components .......................................10

PCB Design Considerations for RTC ............................11

Layout requirements ..................................................11

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

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

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

Data Retention and Endurance ..................................... 17

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

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

AC Test Loads ................................................................ 18

AC Test Conditions ........................................................ 18

RTC Characteristics ....................................................... 18

AC Switching Characteristics ....................................... 19

SRAM Read Cycle .................................................... 19

SRAM Write Cycle ..................................................... 19

AutoStore/Power-Up RECALL ....................................... 21

Switching Waveforms .................................................... 21

Software Controlled STORE/RECALL Cycle ................ 22

Switching Waveforms .................................................... 22

Hardware STORE Cycle ................................................. 23

Switching Waveforms .................................................... 23

Truth Table For SRAM Operations ................................ 24

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

Ordering Code Definitions ......................................... 24

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

Acronyms ........................................................................ 26

Document Conventions ................................................. 26

Units of Measure ....................................................... 26

Document History Page ................................................. 27

Sales, Solutions, and Legal Information ...................... 28

Worldwide Sales and Design Support ....................... 28

Products .................................................................... 28

PSoC® Solutions ...................................................... 28

Cypress Developer Community ................................. 28

Technical Support ..................................................... 28

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