CY14B256KA_12 Datasheet, PDF (2/27 Pages) Cypress Semiconductor – 256-Kbit (32 K × 8) nvSRAM with Real Time Clock

CY14B256KA
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 .................................................. 7
Data Protection ............................................................ 7
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 ............................ 8
Calibrating the Clock ................................................... 8
Alarm ........................................................................... 8
Watchdog Timer .......................................................... 9
Power Monitor ............................................................. 9
Interrupts ..................................................................... 9
Flags Register ........................................................... 10
Maximum Ratings ........................................................... 15
Operating Range ............................................................. 15
DC Electrical Characteristics ........................................ 15
Data Retention and Endurance ..................................... 16
Capacitance .................................................................... 16
Thermal Resistance ........................................................ 16
AC Test Loads ................................................................ 17
AC Test Conditions ........................................................ 17
RTC Characteristics ....................................................... 17
AC Switching Characteristics ....................................... 18
SRAM Read Cycle .................................................... 18
SRAM Write Cycle ..................................................... 18
AutoStore/Power-Up RECALL ....................................... 20
Switching Waveforms .................................................... 20
Software Controlled STORE/RECALL Cycle ................ 21
Switching Waveforms .................................................... 21
Hardware STORE Cycle ................................................. 22
Switching Waveforms .................................................... 22
Truth Table For SRAM Operations ................................ 23
Ordering Information ...................................................... 23
Ordering Code Definitions ......................................... 23
Package Diagram ............................................................ 24
Acronyms ........................................................................ 25
Document Conventions ................................................. 25
Units of Measure ....................................................... 25
Document History Page ................................................. 26
Sales, Solutions, and Legal Information ...................... 27
Worldwide Sales and Design Support ....................... 27
Products .................................................................... 27
PSoC Solutions ......................................................... 27
Document Number: 001-55720 Rev. *G
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