Cypress Semiconductor STK15C88 Hoja de especificaciones

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Features

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25 ns and 45 ns access times

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Pin compatible with industry standard SRAMs

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Automatic nonvolatile STORE on power loss

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Nonvolatile STORE under Software control

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Automatic RECALL to SRAM on power up

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Unlimited Read/Write endurance

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Unlimited RECALL cycles

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1,000,000 STORE cycles

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100 year data retention

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Single 5V+10% power supply

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Commercial and Industrial Temperatures

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28-pin (300 mil and 330 mil) SOIC packages

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RoHS compliance

Logic Block Diagram

Cypress Semiconductor Corporation

Document Number: 001-50593 Rev. **

256 Kbit (32K x 8) PowerStore nvSRAM

Functional Description

The Cypress STK15C88 is a 256Kb fast static RAM with a

nonvolatile element in each memory cell. The embedded

nonvolatile elements incorporate QuantumTrap

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 from the SRAM to the

nonvolatile elements (the STORE operation) takes place

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

the SRAM (the RECALL operation) from the nonvolatile

memory. Both the STORE and RECALL operations are also

available under software control.

PowerStore nvSRAM products depend on the intrinsic system

capacitance to maintain system power long enough for an

automatic store on power loss. If the power ramp from 5 volts

to 3.6 volts is faster than 10 ms, consider our 14C88 or 16C88

for more reliable operation.

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198 Champion Court

•

San Jose

CA 95134-1709

STK15C88

™

technology

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408-943-2600

Revised January 29, 2009

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