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STK16C88

256 Kbit (32K x 8) AutoStore+ nvSRAM

Cypress Semiconductor Corporation • 198 Champion Court • San Jose

CA 95134-1709 • 408-943-2600

Document Number: 001-50595 Rev. ** Revised January 29, 2009

Features

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25 ns and 45 ns access times

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Directly replaces battery-backed SRAM modules such as

Dallas/Maxim DS1230 AB

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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 (600 mil) PDIP package

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RoHS compliance

Functional Description

The Cypress STK16C88 is a 256 Kb 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.

Logic Block Diagram

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Summary of content (14 pages)

PAGE 1
STK16C88 256 Kbit (32K x 8) AutoStore+ nvSRAM Features Functional Description ■ 25 ns and 45 ns access times ■ Directly replaces battery-backed SRAM modules such as Dallas/Maxim DS1230 AB ■ 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 The Cypress STK16C88 is a 256 Kb fast static RAM with a nonvolatile element in each memory cell.
PAGE 2
STK16C88 Pin Configurations Figure 1. Pin Diagram - 28-Pin PDIP $ 9&& $ $ :( $ $ $ $ $ $ 2( $ $ &( $ '4 '4 723 $ $ $ '4 '4 '4 '4 '4 966 '4 Table 1. Pin Definitions - 28-Pin PDIP Pin Name Alt IO Type A0–A14 Input DQ0-DQ7 Input or Output Description Address Inputs. Used to select one of the 32,768 bytes of the nvSRAM. Bidirectional Data IO lines.
PAGE 3
STK16C88 Device Operation The AutoStore+ STK16C88 is a fast 32K x 8 SRAM that does not lose its data on power down. The data is preserved in integral QuantumTrap nonvolatile storage elements when power is lost. Automatic STORE on power down and automatic RECALL on power up guarantee data integrity without the use of batteries. SRAM Read The STK16C88 performs a READ cycle whenever CE and OE are LOW while WE is HIGH. The address specified on pins A0–14 determines the 32,768 data bytes accessed.
PAGE 4
STK16C88 Hardware Protect Figure 3. Current Versus Cycle Time (WRITE) The STK16C88 offers hardware protection against inadvertent STORE operation and SRAM WRITEs during low voltage conditions. When VCAP
PAGE 5
STK16C88 Table 2. Software STORE/RECALL Mode Selection CE L WE H L H A13 – A0 0x0E38 0x31C7 0x03E0 0x3C1F 0x303F 0x0FC0 0x0E38 0x31C7 0x03E0 0x3C1F 0x303F 0x0C63 Mode Read SRAM Read SRAM Read SRAM Read SRAM Read SRAM Nonvolatile STORE Read SRAM Read SRAM Read SRAM Read SRAM Read SRAM Nonvolatile RECALL IO Output Data Output Data Output Data Output Data Output Data Output Data Output Data Output Data Output Data Output Data Output Data Output Data Notes [1, 2] [1, 2] Notes 1.
PAGE 6
STK16C88 Maximum Ratings Voltage on DQ0-7 ....................................–0.5V to Vcc + 0.5V Exceeding maximum ratings may shorten the useful life of the device. These user guidelines are not tested. Power Dissipation ......................................................... 1.0W DC output Current (1 output at a time, 1s duration) .... 15 mA Operating Range Storage Temperature ................................. –65°C to +150°C Range Temperature under bias ..............................
PAGE 7
STK16C88 Capacitance In the following table, the capacitance parameters are listed.[4] Parameter Description CIN Input Capacitance COUT Output Capacitance Test Conditions TA = 25°C, f = 1 MHz, VCC = 0 to 3.0 V Max Unit 5 pF 7 pF Thermal Resistance In the following table, the thermal resistance parameters are listed.
PAGE 8
STK16C88 AC Switching Characteristics Table 3.
PAGE 9
STK16C88 Table 4.
PAGE 10
STK16C88 AutoStore or Power Up RECALL Parameter tHRECALL [10] tSTORE tstg[4, 6] VRESET VSWITCH Alt tRESTORE tHLHZ STK16C88 Min Max 550 10 500 3.6 4.0 4.5 Description Power up RECALL Duration STORE Cycle Duration Power-down AutoStore Slew Time to Ground Low Voltage Reset Level Low Voltage Trigger Level Unit μs ms ns V V Switching Waveforms Figure 9.
PAGE 11
STK16C88 Software Controlled STORE/RECALL Cycle The software controlled STORE/RECALL cycle follows. [11, 12] Parameter tRC tSA [11] tCW[11] tHACE[7, 11] Alt 25 ns Description Min 45 ns Max Min Max Unit tAVAV STORE/RECALL Initiation Cycle Time 25 45 ns tAVEL Address Setup Time 0 0 ns tELEH Clock Pulse Width 20 30 ns tELAX Address Hold Time 20 20 ns RECALL Duration tRECALL 20 20 μs Switching Waveforms Figure 10.
PAGE 12
STK16C88 Part Numbering Nomenclature (Commercial and Industrial) STK16C88 - W F 45 I Temperature Range: Blank - Commercial (0 to 70°C) I - Industrial (-40 to 85°C) Speed: 25 - 25 ns 45 - 45 ns Lead Finish F = 100% Sn (Matte Tin) Package: W = Plastic 28-pin 600 mil DIP Ordering Information Speed (ns) 25 45 Ordering Code Package Diagram Package Type Operating Range STK16C88-WF25 51-85017 28-pin PDIP Commercial STK16C88-WF25I 51-85017 28-pin PDIP Industrial STK16C88-WF45 51-85017 28-pin PDI
PAGE 13
STK16C88 Package Diagrams Figure 11. 28-Pin (600 Mil) PDIP (51-85017) 51-85127-*A 51-85017- *B Document Number: 001-50595 Rev.
PAGE 14
STK16C88 Document History Page Document Title: STK16C88 256 Kbit (32K x 8) AutoStore+ nvSRAM Document Number: 001-50595 Rev. ECN No. Orig. of Change Submission Date ** 2625096 GVCH/PYRS 12/19/08 Description of Change New data sheet Sales, Solutions and Legal Information Worldwide Sales and Design Support Cypress maintains a worldwide network of offices, solution centers, manufacturer’s representatives, and distributors. To find the office closest to you, visit us at cypress.com/sales.