CY14B256PA(2011) View Datasheet(PDF) - Cypress Semiconductor

Part Name

Description

MFG CO.

CY14B256PA
(Rev.:2011)

256-Kbit (32 K × 8) SPI nvSRAM with Real Time Clock

Cypress Semiconductor 

CY14C256PA

CY14B256PA

CY14E256PA

256-Kbit (32 K × 8) SPI nvSRAM

with Real Time Clock

256-Kbit (32 K × 8) SPI nvSRAM with Real Time Clock

Features

■ 256-Kbit nonvolatile static random access memory (nvSRAM)

❐ Internally organized as 32 K × 8

❐ STORE to QuantumTrap nonvolatile elements initiated

automatically on power-down (AutoStore) or by using SPI

instruction (Software STORE) or HSB pin (Hardware

STORE)

❐ RECALL to SRAM initiated on power-up (Power Up RECALL)

or by SPI instruction (Software RECALL)

❐ Automatic STORE on power-down with a small capacitor

■ High reliability

❐ Infinite read, write, and RECALL cycles

❐ 1 million STORE cycles to QuantumTrap

❐ Data retention: 20 years at 85C

■ Real time clock (RTC)

❐ Full-featured RTC

❐ Watchdog timer

❐ Clock alarm with programmable interrupts

❐ Backup power fail indication

❐ Square wave output with programmable frequency (1 Hz,

512 Hz, 4096 Hz, 32.768 kHz)

❐ Capacitor or battery backup for RTC

❐ Backup current of 0.45 µA (typical)

■ 40 MHz, and 104 MHz High-speed serial peripheral interface

(SPI)

❐ 40 MHz clock rate SPI write and read with zero cycle delay

❐ 104 MHz clock rate SPI write and read (with special fast read

instructions)

❐ Supports SPI mode 0 (0,0) and mode 3 (1,1)

■ SPI access to special functions

❐ Nonvolatile STORE/RECALL

❐ 8-byte serial number

❐ Manufacturer ID and Product ID

❐ Sleep mode

■ Write protection

❐ Hardware protection using Write Protect (WP) pin

❐ Software protection using Write Disable instruction

❐ Software block protection for 1/4, 1/2, or entire array

■ Low power consumption

❐ Average active current of 3 mA at 40 MHz operation

❐ Average standby mode current of 250 A

❐ Sleep mode current of 8 A

■ Industry standard configurations

❐ Operating voltages:

• CY14C256PA : VCC = 2.4 V to 2.6 V

• CY14B256PA : VCC = 2.7 V to 3.6 V

• CY14E256PA : VCC = 4.5 V to 5.5 V

❐ Industrial temperature

❐ 16-pin small outline integrated circuit (SOIC) package

❐ Restriction of hazardous substances (RoHS) compliant

Overview

The Cypress CY14X256PA combines a 256-Kbit nvSRAM[1] with

a full-featured RTC in a monolithic integrated circuit with serial

SPI interface. The memory is organized as 32 K words of 8 bits

each. The embedded nonvolatile elements incorporate the

QuantumTrap technology, creating the world’s most reliable

nonvolatile memory. The SRAM provides infinite read and write

cycles, while the QuantumTrap cells provide highly reliable

nonvolatile storage of data. Data transfers from SRAM to the

nonvolatile elements (STORE operation) takes place

automatically at power-down. On power-up, data is restored to

the SRAM from the nonvolatile memory (RECALL operation).

You can also initiate the STORE and RECALL operations

through SPI instruction.

Logic Block Diagram

VCC VCAP VRTCcap VRTCbat

Serial Number

8x8

SI

CS

SCK

WP

SO

Power Control

Block

SLEEP

SPI Control Logic

Write Protection

Instruction decoder

Manufacture ID/

Product ID

RDSN/WRSN/RDID

READ/WRITE

STORE/RECALL/ASENB/ASDISB

Memory

Data &

Address

Control

QuantrumTrap

32 K x 8

SRAM

32 K x 8

STORE

RECALL

RDRTC/WRTC

WRSR/RDSR/WREN

Status Register

Xin

INT/SQW

Xout

RTC Control Logic

Registers

Counters

Note

1. This device will be referred to as nvSRAM throughout the document.

Cypress Semiconductor Corporation • 198 Champion Court

Document #: 001-65281 Rev. *B

• San Jose, CA 95134-1709 • 408-943-2600

Revised May 4, 2011

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