CY15B256Q Datasheet, PDF (2/22 Pages) Cypress Semiconductor – 256-Kbit (32K × 8) Automotive Serial (SPI) F-RAM

CY15B256Q
Contents
Pinout ................................................................................ 3
Pin Definitions .................................................................. 3
Functional Overview ........................................................ 4
Memory Architecture ........................................................ 4
Serial Peripheral Interface - SPI Bus .............................. 4
SPI Overview ............................................................... 4
SPI Modes ................................................................... 5
Power Up to First Access ............................................ 6
Command Structure .................................................... 6
WREN - Set Write Enable Latch ................................. 6
WRDI - Reset Write Enable Latch ............................... 6
Status Register and Write Protection ............................. 7
RDSR - Read Status Register ..................................... 7
WRSR - Write Status Register .................................... 7
Memory Operation ............................................................ 8
Write Operation ........................................................... 8
Read Operation ........................................................... 8
Fast Read Operation ................................................... 8
HOLD Pin Operation ................................................. 10
Sleep Mode ............................................................... 10
Device ID ................................................................... 11
Endurance ................................................................. 12
Maximum Ratings ........................................................... 13
Operating Range ............................................................. 13
DC Electrical Characteristics ........................................ 13
Data Retention and Endurance ..................................... 14
Capacitance .................................................................... 14
Thermal Resistance ........................................................ 14
AC Test Conditions ........................................................ 14
AC Switching Characteristics ....................................... 15
Power Cycle Timing ....................................................... 17
Ordering Information ...................................................... 18
Ordering Code Definitions ......................................... 18
Package Diagram ............................................................ 19
Acronyms ........................................................................ 20
Document Conventions ................................................. 20
Units of Measure ....................................................... 20
Document History Page ................................................. 21
Sales, Solutions, and Legal Information ...................... 22
Worldwide Sales and Design Support ....................... 22
Products .................................................................... 22
PSoC® Solutions ...................................................... 22
Cypress Developer Community ................................. 22
Technical Support ..................................................... 22
Document Number: 001-90867 Rev. *E
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