Cypress STK11C68 manual Features, Functional Description

STK11C68

64 Kbit (8K x 8) SoftStore nvSRAM

Features

■25 ns, 35 ns, and 45 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

■Commercial and industrial temperature

■28-pin (330 mil) SOIC package

■28-pin (300 mil) CDIP and 28-pad (350 mil) LCC packages

■RoHS compliance

Functional Description

The Cypress STK11C68 is a 64Kb fast static RAM with a nonvol- atile element in each memory cell. The embedded nonvolatile elements incorporate QuantumTrap technology producing 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 automat- ically restored to the SRAM (the RECALL operation) from the nonvolatile memory. RECALL operations are also available under software control.

Logic Block Diagram
				Quantum Trap		VCC	VCAP
A5				128 X 512		POWER
A6	DECODER			STORE		CONTROL
A7				RECALL		STORE/
A8			STATIC RAM			RECALL		HSB
				ARRAY
A9						CONTROL
	ROW		128 X 512
A11								SOFTWARE
A12									A0	- A12
								DETECT
DQ0			COLUMN I/O
DQ1	BUFFERS		COLUMN DEC
DQ2
DQ3
DQ4
	INPUT
DQ5		A0 A1 A2 A3 A4 A10
DQ6
DQ7
									OE
									CE
									WE
Cypress Semiconductor Corporation			•	198 Champion Court	•	San Jose, CA 95134-1709			•	408-943-2600
Document Number: 001-50638 Rev. **								Revised January 30, 2009

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