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Cypress STK16C88 manual

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Table of contents for the manual

  • Page 1

    STK16C88 256 Kbit (32K x 8) AutoS tore+ nvSRAM Cypress Semiconducto r Corporation • 198 Champion Court • San Jose , CA 95134-1709 • 408-943-2600 Document Number: 001-50595 Rev . ** Revised January 29, 2009 Features ■ 25 ns and 45 ns access times ■ Directly replaces battery-ba cked SRAM modules such as Dallas/Maxim DS1230 AB ■ Automatic [...]

  • Page 2

    STK16C88 Document Number: 001-50595 Rev . ** Page 2 of 14 Pin Configurations Figure 1. Pin Diagram - 28-Pin PDIP T able 1. Pin Definitions - 28-Pin PDIP Pin Name Alt IO T ype Description A 0 –A 14 Input Address In pu ts. Used to select one of the 32,768 bytes of the nvSRAM. DQ 0 -DQ 7 Input or Output Bidirectional Data IO lines . Used as input or[...]

  • Page 3

    STK16C88 Document Number: 001-50595 Rev . ** Page 3 of 14 Device Operation The AutoS tore+ STK16C88 is a fast 32K x 8 SRAM that does not lose its data on power down. The data is preserved in inte gral QuantumTrap nonvolatile storage elements when power is lost. Automatic STORE on power down and automatic RECALL on power up guarantee data integrit y[...]

  • Page 4

    STK16C88 Document Number: 001-50595 Rev . ** Page 4 of 14 Hardware Protect The STK16C88 offers hardware protectio n against inadve rtent STORE operation and SRAM WRITEs during low voltage conditions. When V CAP <V SWITCH , all externally i nitiated STORE operations and SRAM WRITEs are inhibited. Noise Considerations The STK16C88 is a high speed [...]

  • Page 5

    STK16C88 Document Number: 001-50595 Rev . ** Page 5 of 14 T able 2. Software STOR E/RECALL Mode Selecti on CE WE A 13 – A 0 Mode IO Notes L H 0x0E38 0x31C7 0x03E0 0x3C1F 0x303F 0x0FC0 Read SRAM Read SRAM Read SRAM Read SRAM Read SRAM Nonvolatile STORE Output Data Output Data Output Data Output Data Output Data Output Data [1, 2] L H 0x0E38 0x31C7[...]

  • Page 6

    STK16C88 Document Number: 001-50595 Rev . ** Page 6 of 14 Maximum Ratin gs Exceeding maximum ratings may shorten the useful life of the device. These user g uidelines are not tested. S torage T emperature ............. ... ... ... ........... –65 ° C to +150 ° C T emperature under bias ................ .............. –55 ° C to +125 ° C Sup[...]

  • Page 7

    STK16C88 Document Number: 001-50595 Rev . ** Page 7 of 14 Cap acit ance In the following table, the capacitance parameters are listed. [4] Parameter Description T est Condi tions Max Unit C IN Input Capacit ance T A = 25 ° C, f = 1 MHz, V CC = 0 to 3.0 V 5p F C OUT Output Capacitance 7 pF Thermal Resist ance In the following table, the thermal res[...]

  • Page 8

    STK16C88 Document Number: 001-50595 Rev . ** Page 8 of 14 AC Switching Characteristics T able 3. SRAM Read Cycle Parameter Description 25 ns 45 ns Unit Min Max Min Max Cypress Parameter Alt t ACE t ELQV Chip Enable Access Time 25 45 ns t RC [5] t AVAV, t ELEH Read Cycle T ime 25 45 ns t AA [6] t AV Q V Address Access T ime 25 45 ns t DOE t GLQV Out[...]

  • Page 9

    STK16C88 Document Number: 001-50595 Rev . ** Page 9 of 14 T able 4. SRAM Write Cycle Parameter Description 25 n s 45 ns Unit Min Max Min Max Cypress Parameter Alt t WC t AVAV Write Cycle T ime 25 45 ns t PWE t WL WH, t WLEH Write Pulse Width 20 30 ns t SCE t EL WH, t ELEH Chip Enable T o End of Write 20 30 ns t SD t DVWH, t DVEH Data Setup to End o[...]

  • Page 10

    STK16C88 Document Number: 001-50595 Rev . ** Page 10 of 14 AutoS tore or Power Up RECALL Parameter Alt Description STK16C88 Unit Min Max t HRECALL [10] t RESTORE Power up RECALL Duration 550 μ s t STORE t HLHZ STORE Cycle Duration 10 ms t stg [4, 6] Power-down AutoStore Slew T ime to Ground 500 ns V RESET Low V oltage Reset Leve l 3.6 V V SWITCH L[...]

  • Page 11

    STK16C88 Document Number: 001-50595 Rev . ** Page 1 1 of 14 Sof tware Controlled STORE/RECALL Cycle The software controlled ST ORE/RECALL cycle follows. [1 1, 12] Parameter Alt Description 25 ns 45 ns Unit Min Max Min Max t RC t AVAV STORE/RECALL Initiation Cycle T ime 25 45 ns t SA [1 1] t A VEL Address Setup T ime 0 0 ns t CW [1 1] t ELEH Clock P[...]

  • Page 12

    STK16C88 Document Number: 001-50595 Rev . ** Page 12 of 14 Ordering Information Spe e d (ns) Ordering Code Package Diagra m Package T ype Operating 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 Commercial STK16C88-WF45I 51-85017 28-pin PDIP Industrial All [...]

  • Page 13

    STK16C88 Document Number: 001-50595 Rev . ** Page 13 of 14 Package Diagrams Figure 1 1. 28-Pin (600 Mil) PDIP (51-85017 ) 51-85127-*A 51-85017- *B [+] Feedback[...]

  • Page 14

    Document Number: 001-50595 Rev . ** Revised January 29, 20 09 Page 14 of 14 AutoStore and QuantumT rap are reg istered trademarks of Cy press Semiconductor Corp oration. All product s and compan y names mentioned in thi s docum ent may be the trademarks of thei r respective holders. STK16C88 © Cypress Semicondu ctor Corpor ation, 2008-200 9. The i[...]