Cypress STK15C88 Manual do Utilizador descarregar pdf

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

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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

[+] Feedback

1 2 3 4 5 6 ... 14 15

STK15C88 1

Resumo do Conteúdo

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STK15C88256 Kbit (32K x 8) PowerStore nvSRAMCypress Semiconductor Corporation • 198 Champion Court • San Jose,CA 95134-1709 • 408-943-2600Document Num

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STK15C88Document Number: 001-50593 Rev. ** Page 10 of 15AutoStore or Power Up RECALLParameter Alt DescriptionSTK15C88UnitMin MaxtHRECALL [10]tRESTORE

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STK15C88Document Number: 001-50593 Rev. ** Page 11 of 15Software Controlled STORE/RECALL CycleThe software controlled STORE/RECALL cycle follows. [11,

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STK15C88Document Number: 001-50593 Rev. ** Page 12 of 15Ordering InformationSpeed(ns)Ordering Code Package Diagram Package TypeOperatingRange25 STK15C

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STK15C88Document Number: 001-50593 Rev. ** Page 13 of 15Package DiagramsFigure 11. 28-Pin (300 mil) SOIC (51-85026)51 85127 *APIN 1 ID0.291[7.39]0.30

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STK15C88Document Number: 001-50593 Rev. ** Page 14 of 15Figure 12. 28-Pin (330 mil) SOIC (51-85058)Package Diagrams (continued)51-85058-*A[+] Feedbac

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Document Number: 001-50593 Rev. ** Revised January 29, 2009 Page 15 of 15AutoStore and QuantumTrap are registered trademarks of Cypress Semiconductor

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STK15C88Document Number: 001-50593 Rev. ** Page 2 of 15Pin ConfigurationsFigure 1. Pin Diagram - 28-Pin SOICTable 1. Pin Definitions - 28-Pin SOICPi

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STK15C88Document Number: 001-50593 Rev. ** Page 3 of 15Device OperationThe STK15C88 is a versatile memory chip that provides severalmodes of operation

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STK15C88Document Number: 001-50593 Rev. ** Page 4 of 15Hardware Protect The STK15C88 offers hardware protection against inadvertentSTORE operation an

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STK15C88Document Number: 001-50593 Rev. ** Page 5 of 15Table 2. Software STORE/RECALL Mode Selection CE WEA13 – A0Mode IO NotesL H 0x0E380x31C70x03E0

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STK15C88Document Number: 001-50593 Rev. ** Page 6 of 15Maximum RatingsExceeding maximum ratings may shorten the useful life of thedevice. These user g

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STK15C88Document Number: 001-50593 Rev. ** Page 7 of 15Data Retention and EnduranceParameter Description Min UnitDATARData Retention 100 YearsNVCNonvo

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STK15C88Document Number: 001-50593 Rev. ** Page 8 of 15AC Switching Characteristics SRAM Read CycleParameterDescription25 ns 45 ns UnitMin Max Min Ma

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STK15C88Document Number: 001-50593 Rev. ** Page 9 of 15Table 3. SRAM Write CycleParameterDescription25 ns 45 ns UnitMin Max Min MaxCypressParameterA