Cypress STK15C88 - Manual

STK15C88
256 Kbit (32K x 8) PowerStore nvSRAM
Cypress Semiconductor Corporation • 198 Champion Court • San Jose , CA 95134-1709 • 408-943-2600
Document Number: 001-50593 Rev. ** Revised January 29, 2009
Features
■ 25 ns and 45 ns access times
■ Pin compatible with industry standard SRAMs
■ Automatic nonvolatile STORE on power loss
■ Nonvolatile STORE under Software control
■ Automatic RECALL to SRAM on power up
■ Unlimited Read/Write endurance
■ Unlimited RECALL cycles
■ 1,000,000 STORE cycles
■ 100 year data retention
■ Single 5V+10% power supply
■ Commercial and Industrial Temperatures
■ 28-pin (300 mil and 330 mil) SOIC packages
■ RoHS compliance
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
™
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 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.
Logic Block Diagram
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