Cypress STK11C68-5 manual Features, Functional Description, Logic Block Diagram

STK11C68-5 (SMD5962-92324)

64 Kbit (8K x 8) SoftStore nvSRAM

Features

■35 ns, 45 ns, and 55 ns access times

■Pin compatible with industry standard SRAMs

■Software initiated nonvolatile STORE

■Unlimited Read and Write endurance

■Automatic RECALL to SRAM on power up

■Unlimited RECALL cycles

■1,000,000 STORE cycles

■100 year data retention

■Single 5V ± 10% operation

■Military temperature

■28-pin (300 mil) CDIP and 28-pad LCC packages

Functional Description

The Cypress STK11C68-5 is a 64 Kb fast static RAM with a nonvolatile element in each memory cell. The embedded nonvolatile elements incorporate QuantumTrap technology to produce the world’s most reliable nonvolatile memory. The SRAM provides unlimited read and write cycles, while independent nonvolatile data resides in the highly reliable QuantumTrap cell. Data transfers under software control from SRAM to the nonvolatile elements (the STORE operation). On power up, data is automatically restored to the SRAM (the RECALL operation) from the nonvolatile memory. RECALL operations are also available under software control.

Logic Block Diagram

A5

A6

Quantum Trap

128 X 512

STORE

VCC VCAP

POWER

CONTROL

A7

A8

A9

A11 A12

ROW DECODER

STATIC RAM

ARRAY

128 X 512

RECALL

STORE/
RECALL
			HSB
CONTROL
	SOFTWARE			A0 - A12
		DETECT

DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7

COLUMN I/O

BUFFERS		COLUMN DEC
INPUT	A	0 A1 A2 A3 A4 A10

OE

CE

WE

Cypress Semiconductor Corporation • 198 Champion Court	•	San Jose, CA 95134-1709	•	408-943-2600
Document Number: 001-51001 Rev. *A			Revised April 07, 2009

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