Manual do usuário Cypress STK16C88

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STK16C88
256 Kbit (32K x 8) AutoStore+ nvSRAM
Features Functional Description
■ 25 ns and 45 ns access times The Cypress STK16C88 is a 256 Kb fast static RAM with a
nonvolatile element in each memory cell. The embedded
■ Directly replaces battery-backed SRAM modules such as
nonvolatile elements incorporate QuantumTrap™ technology
Dallas/Maxim DS1230 AB
producing the world’s most reliable nonvolatile memory. The
SRAM provides unlimited read and write cycles, while
■ Automatic nonvolatile STORE o

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STK16C88 Pin Configurations Figure 1. Pin Diagram - 28-Pin PDIP Table 1. Pin Definitions - 28-Pin PDIP Pin Name Alt IO Type Description A –A Input Address Inputs. Used to select one of the 32,768 bytes of the nvSRAM. 0 14 DQ -DQ Input or Bidirectional Data IO lines. Used as input or output lines depending on operation. 0 7 Output Input Write Enable Input, Active LOW. When the chip is enabled and WE is LOW, data on the WE W IO pins is wr

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STK16C88 If the STK16C88 is in a WRITE state at the end of power up Device Operation RECALL, the SRAM data is corrupted. To help avoid this situation, a 10 Kohm resistor is connected either between WE The AutoStore+ STK16C88 is a fast 32K x 8 SRAM that does not and system V or between CE and system V . lose its data on power down. The data is preserved in integral CC CC QuantumTrap nonvolatile storage elements when power is lost. Software STORE Automatic STORE on power down and automatic RECALL

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STK16C88 Figure 3. Current Versus Cycle Time (WRITE) Hardware Protect The STK16C88 offers hardware protection against inadvertent STORE operation and SRAM WRITEs during low voltage conditions. When V

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STK16C88 Table 2. Software STORE/RECALL Mode Selection A – A Mode IO Notes CE WE 13 0 [1, 2] L H 0x0E38 Read SRAM Output Data 0x31C7 Read SRAM Output Data 0x03E0 Read SRAM Output Data 0x3C1F Read SRAM Output Data 0x303F Read SRAM Output Data 0x0FC0 Nonvolatile STORE Output Data [1, 2] L H 0x0E38 Read SRAM Output Data 0x31C7 Read SRAM Output Data 0x03E0 Read SRAM Output Data 0x3C1F Read SRAM Output Data 0x303F Read SRAM Output Data 0x0C63 Nonvolatile RECALL Output Data Notes must be high durin

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STK16C88 Voltage on DQ ....................................–0.5V to Vcc + 0.5V Maximum Ratings 0-7 Power Dissipation ......................................................... 1.0W Exceeding maximum ratings may shorten the useful life of the DC output Current (1 output at a time, 1s duration) .... 15 mA device. These user guidelines are not tested. Operating Range Storage Temperature .................................–65°C to +150°C Range Ambient Temperature V Temperature under bias ..............

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STK16C88 Capacitance [4] In the following table, the capacitance parameters are listed. Parameter Description Test Conditions Max Unit C Input Capacitance T = 25°C, f = 1 MHz, 5pF IN A V = 0 to 3.0 V CC C Output Capacitance 7 pF OUT Thermal Resistance [4] In the following table, the thermal resistance parameters are listed. Parameter Description Test Conditions 28-PDIP Unit Θ Thermal Resistance Test conditions follow standard test methods and proce- TBD °C/W JA (Junction to Ambient) dures for me

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STK16C88 AC Switching Characteristics Table 3. SRAM Read Cycle Parameter 25 ns 45 ns Description Unit Cypress Alt Min Max Min Max Parameter t t Chip Enable Access Time 25 45 ns ACE ELQV [5] t t t Read Cycle Time 25 45 ns RC AVAV, ELEH [6] t t Address Access Time 25 45 ns AA AVQV t t Output Enable to Data Valid 10 20 ns DOE GLQV [6] t t Output Hold After Address Change 5 5 ns OHA AXQX [7] t t Chip Enable to Output Active 5 5 ns LZCE ELQX [7] t t Chip Disable to Output Inactive 10 15 ns HZCE EH

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STK16C88 Table 4. SRAM Write Cycle Parameter 25 ns 45 ns Description Unit Cypress Alt Min Max Min Max Parameter t t Write Cycle Time 25 45 ns WC AVAV t t t Write Pulse Width 20 30 ns PWE WLWH, WLEH t t t Chip Enable To End of Write 20 30 ns SCE ELWH, ELEH t t t Data Setup to End of Write 10 15 ns SD DVWH, DVEH t t t Data Hold After End of Write 0 0 ns HD WHDX, EHDX t t t Address Setup to End of Write 20 30 ns AW AVWH, AVEH t t t Address Setup to Start of Write 0 0 ns SA AVWL, AVEL t t t Addres

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STK16C88 AutoStore or Power Up RECALL STK16C88 Parameter Alt Description Unit Min Max [10] t t Power up RECALL Duration 550 μs HRECALL RESTORE t t STORE Cycle Duration 10 ms STORE HLHZ [4, 6] t Power-down AutoStore Slew Time to Ground 500 ns stg V Low Voltage Reset Level 3.6 V RESET V Low Voltage Trigger Level 4.0 4.5 V SWITCH Switching Waveforms Figure 9. AutoStore/Power Up RECALL Notes 10. t starts from the time V rises above V . HRECALL CC SWITCH Documen

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STK16C88 Software Controlled STORE/RECALL Cycle [11, 12] The software controlled STORE/RECALL cycle follows. 25 ns 45 ns Parameter Alt Description Unit Min Max Min Max t t STORE/RECALL Initiation Cycle Time 25 45 ns RC AVAV [11] t t Address Setup Time 0 0 ns SA AVEL [11] t t Clock Pulse Width 20 30 ns CW ELEH [7, 11] t t Address Hold Time 20 20 ns HACE ELAX RECALL Duration 20 20 μs t RECALL Switching Waveforms [12] Figure 10. CE Controlled Software STORE/RECALL Cycle t t RC RC ADDRESS # 1 AD

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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 Operating Ordering Code Package Diagram Package Type (ns) Range 25 STK16C88-WF25 51-85017 28-pin PDIP Commercial STK16C88-WF25I 51-85017 28-pin PDIP Industrial 45 STK16C88-WF45 51-85017 28-pin PDIP Comme

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STK16C88 Package Diagrams Figure 11. 28-Pin (600 Mil) PDIP (51-85017) 51-85127-*A 51-85017- *B Document Number: 001-50595 Rev. ** Page 13 of 14 [+] Feedback

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STK16C88 Document History Page Document Title: STK16C88 256 Kbit (32K x 8) AutoStore+ nvSRAM Document Number: 001-50595 Orig. of Submission Rev. ECN No. Description of Change Change Date ** 2625096 GVCH/PYRS 12/19/08 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. Products