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Cypress STK16C88-3 - page 1
STK16C88-3 256 Kbit (32K x 8) AutoS tore+ nvSRAM Cypress Semiconducto r Corporation • 198 Champion Court • San Jose , CA 95134-1709 • 408-943-2600 Document Number: 001-50594 Rev . ** Revised January 29, 2009 Features ■ Fast 35ns Read access and R/W cycle time ■ Directly replaces battery-ba cked SRAM modules such as Dallas/Maxim DS1230W ? ...
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Cypress STK16C88-3 - page 2
STK16C88-3 Document Number: 001-50594 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 ...
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Cypress STK16C88-3 - page 3
STK16C88-3 Document Number: 001-50594 Rev . ** Page 3 of 14 Device Operation The AutoS tore+ ST K16C8 8-3 is a fast 32K x 8 SR AM that does not lose its data on power down. T he data is preserved in inte gral QuantumTrap non-volatile storage elemen ts when power is lost. Automatic STORE on power down and automatic RECALL on power up guarantee data ...
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Cypress STK16C88-3 - page 4
STK16C88-3 Document Number: 001-50594 Rev . ** Page 4 of 14 Hardware Protect The STK16C88-3 offers hardware protection against inadvertent STORE operation and SRAM WRITEs during low voltage conditions. When V CAP <V SWITCH , all extern ally initiated STORE operation s and SRAM WRITEs are inh ibited. Noise Considerations The STK16C88-3 is a high ...
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Cypress STK16C88-3 - page 5
STK16C88-3 Document Number: 001-50594 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 0x31 ...
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Cypress STK16C88-3 - page 6
STK16C88-3 Document Number: 001-50594 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 S ...
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Cypress STK16C88-3 - page 7
STK16C88-3 Document Number: 001-50594 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 r ...
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Cypress STK16C88-3 - page 8
STK16C88-3 Document Number: 001-50594 Rev . ** Page 8 of 14 AC Switching Characteristics SRAM Read Cycle Parameter Description 35 ns Unit Min Max Cypress Parameter Alt t ACE t ELQV Chip Enable Access T ime 35 ns t RC [5] t AVAV, t ELEH Read Cycle Time 35 ns t AA [6] t AV Q V Address Access Time 35 ns t DOE t GLQV Output Enable to Dat a V alid 15 ns ...
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Cypress STK16C88-3 - page 9
STK16C88-3 Document Number: 001-50594 Rev . ** Page 9 of 14 T able 3. SRAM Write Cycle Parameter Description 35 n s Unit Min Max Cypress Parameter Alt t WC t AVAV Write Cycle T ime 35 ns t PWE t WL WH, t WLEH Write Pulse Wid th 25 ns t SCE t EL WH, t ELEH Chip Enable T o End of W rite 25 ns t SD t DVWH, t DVEH Data Setup to End of Write 12 ns t HD ...
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Cypress STK16C88-3 - page 10
STK16C88-3 Document Number: 001-50594 Rev . ** Page 10 of 14 AutoStorePlus or Power Up RECALL Parameter Alt Description STK16C88-3 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 2.4 V V S ...
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Cypress STK16C88-3 - page 11
STK16C88-3 Document Number: 001-50594 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 Descrip tion 35 ns Unit Min Max t RC t AVAV STORE/RECALL Initiation Cycle T ime 35 ns t SA [1 1] t AV E L Address Setup T ime 0 ns t CW [1 1] t ELEH Clock Pulse Width 25 n ...
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Cypress STK16C88-3 - page 12
STK16C88-3 Document Number: 001-50594 Rev . ** Page 12 of 14 Ordering Information Spe e d (ns) Ordering Code Package Diagra m Package T ype O perating Range 35 STK16C88-3WF35 51-85017 28-pin PDIP Commercial STK16C88-3WF35I Indu strial All part s are Pb-free. The above table contains Final inf ormatio n. Please contact your local Cypress sales repre ...
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Cypress STK16C88-3 - page 13
STK16C88-3 Document Number: 001-50594 Rev . ** Page 13 of 14 Package Diagrams Figure 1 1. 28-Pin (600 Mil) PDIP (51-85017 ) 51-85017 *B [+] Feedback ...
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Cypress STK16C88-3 - page 14
Document Number: 001-50594 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. STK16C88-3 © Cypress Semicondu ctor Corpor ation, 2008-200 9. The ...
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