CY14B256Q1A-SXI datasheet(1/33 Pages) CYPRESS

Part #	CY14B256Q1A-SXI

Description	256-Kbit (32 K x 8) SPI nvSRAM Infinite read, write, and RECALL cycles

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Manufacturer	CYPRESS [Cypress Semiconductor]

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CY14C256Q

CY14B256Q

CY14E256Q

256-Kbit (32 K × 8) SPI nvSRAM

Cypress Semiconductor Corporation

•

198 Champion Court

•

San Jose

, CA 95134-1709

•

408-943-2600

Document #: 001-65282 Rev. *B

Revised May 3, 2011

256-Kbit (32 K × 8) SPI nvSRAM

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)

❐ Support automatic STORE on power-down with a small

capacitor (except for CY14X256Q1A)

■ High reliability

❐ Infinite read, write, and RECALL cycles

❐ 1million STORE cycles to QuantumTrap

❐ Data retention: 20 years at 85 C

■ 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 SPI 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 150 A

❐ Sleep mode current of 8 A

■ Industry standard configurations

❐ Operating voltages:

• CY14C256Q: VCC = 2.4 V to 2.6 V

• CY14B256Q: VCC = 2.7 V to 3.6 V

• CY14E256Q: VCC = 4.5 V to 5.5 V

❐ Industrial temperature

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

❐ Restriction of hazardous substances (RoHS) compliant

Functional Overview

The Cypress CY14X256Q combines a 256-Kbit nvSRAM[1] with

a nonvolatile element in each memory cell 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 automati-

cally at power-down (except for CY14X256Q1A). 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.

Configuration

Feature

CY14X256Q1A

CY14X256Q2A

CY14X256Q3A

AutoStore

No

Yes

Software

STORE

Yes

Hardware

STORE

No

Yes

Memory

Data &

Address

Control

Manufacture ID/

Product ID

SPI Control Logic

Write Protection

Instruction decoder

Power Control

Block

RDSN/WRSN/RDID

Serial Number

8 x 8

QuantrumTrap

32 K x 8

SRAM

32 K x 8

STORE

SI

CS

SCK

WP

VCC

VCAP

RECALL

READ/WRITE

Status Register

WRSR/RDSR/WREN

STORE/RECALL/ASENB/ASDISB

SO

SLEEP

Logic Block Diagram

Note

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

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CY14B256Q1A-SXI Datasheet(PDF) 1 Page - Cypress Semiconductor

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