Cypress STK14D88 manual Features, Description, Logic Block Diagram

STK14D88

32Kx8 AutoStore™ nvSRAM

Features

■25, 35, 45 ns Read Access and R/W Cycle Time

■Unlimited Read/Write Endurance

■Automatic Nonvolatile STORE on Power Loss

■Nonvolatile STORE Under Hardware or Software Control

■Automatic RECALL to SRAM on Power Up

■Unlimited RECALL Cycles

■200K STORE Cycles

■20-Year Nonvolatile Data Retention

■Single 3.0V +20%, -10% Power Supply

■Commercial, Industrial Temperatures

■Small Footprint SOIC and SSOP Packages (RoHS-Compliant)

Description

The Cypress STK14D88 is a 256Kb fast static RAM with a nonvolatile Quantum Trap™ storage element included with each memory cell.

The SRAM provides fast access and cycle times, ease of use, and unlimited read and write endurance of a normal SRAM.

Data transfers automatically to the nonvolatile storage cells when power loss is detected (the STORE operation). On power up, data is automatically restored to the SRAM (the RECALL operation). Both STORE and RECALL operations are also available under software control.

The Cypress nvSRAM is the first monolithic nonvolatile memory to offer unlimited writes and reads. It is the highest performance, most reliable nonvolatile memory available.

Logic Block Diagram

Quantum Trap

VCCX VCAP

A5
A6	DECODER
A7
A8
A9
A11	ROW
A13
A12

A14

DQ0

DQ1	BUFFERS
DQ2
DQ3
DQ4	INPUT
DQ6
DQ5
DQ7

512 x 512

STORE

STATIC RAM

ARRAY RECALL 512 x 512

COLUMN I/O

COLUMN DEC

A0 A1 A2 A3 A4 A10

POWER

CONTROL

STORE/

RECALL

CONTROL

SOFTWARE

DETECT

HSB

A0 - A13

G

E

W

Cypress Semiconductor Corporation • 198 Champion Court	•	San Jose, CA 95134-1709	•	408-943-2600
Document Number: 001-52037 Rev. **		Revised March 02, 2009

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