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Cypress STK15C88 - page 1
STK15C88 256 Kbit (32K x 8) PowerS tore nvSRAM Cypress Semiconducto r 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 no nvolatile STORE on power loss ? ...
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Cypress STK15C88 - page 2
STK15C88 Document Number: 001-50593 Rev . ** Page 2 of 15 Pin Configurations Figure 1. Pin Diagram - 28-Pin SOIC T able 1. Pin Defini tions - 28-Pin SOIC 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 o ...
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Cypress STK15C88 - page 3
STK15C88 Document Number: 001-50593 Rev . ** Page 3 of 15 Device Operation The STK15C88 is a versatil e memo ry chip that provides several modes of operation. The STK15C 88 can operate as a standard 32K x 8 SRAM. It has a 32K x 8 nonvolatile element shad ow to which the SRAM info rmation can be copied , or from which the SRAM can be updated in nonv ...
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Cypress STK15C88 - page 4
STK15C88 Document Number: 001-50593 Rev . ** Page 4 of 15 Hardware Protect The STK15C88 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 STK15C88 is a high speed ...
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Cypress STK15C88 - page 5
STK15C88 Document Number: 001-50593 Rev . ** Page 5 of 15 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 ...
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Cypress STK15C88 - page 6
STK15C88 Document Number: 001-50593 Rev . ** Page 6 of 15 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 ...
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Cypress STK15C88 - page 7
STK15C88 Document Number: 001-50593 Rev . ** Page 7 of 15 Dat a Retention and Endurance Parameter Description Min Unit DA T A R Data Retention 100 Y ears NV C Nonvolatile STORE Operations 1,000 K 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 ...
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Cypress STK15C88 - page 8
STK15C88 Document Number: 001-50593 Rev . ** Page 8 of 15 AC Switching Characteristics 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 Output Enab l ...
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Cypress STK15C88 - page 9
STK15C88 Document Number: 001-50593 Rev . ** Page 9 of 15 T able 3. 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 ...
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Cypress STK15C88 - page 10
STK15C88 Document Number: 001-50593 Rev . ** Page 10 of 15 AutoS tore or Power Up RECALL Parameter Alt Description STK15C88 Unit Min Max t HRECALL [10] t RESTORE Power up RECALL Duration 550 μ s t STORE [6] t HLHZ STORE Cycle Duration 10 ms V RESET Low V oltage Reset Leve l 3.6 V V SWITCH Low V oltage T rigger Level 4.0 4.5 V Switching W aveforms ...
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Cypress STK15C88 - page 11
STK15C88 Document Number: 001-50593 Rev . ** Page 1 1 of 15 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 ...
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Cypress STK15C88 - page 12
STK15C88 Document Number: 001-50593 Rev . ** Page 12 of 15 Ordering Information Spe e d (ns) Ordering Code Package Diagra m Package T ype Operating Range 25 STK15C88-NF25TR 51-85026 28-Pin SOIC (300 mil) Commercial STK15C88-NF25 51-85026 28-Pin SOIC (300 mil) STK15C88-SF25TR 51-85058 28-Pin SOIC (330 mil) STK15C88-SF25 51-85058 28-Pin SOIC (330 mil ...
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Cypress STK15C88 - page 13
STK15C88 Document Number: 001-50593 Rev . ** Page 13 of 15 Package Diagrams Figure 1 1. 28-Pin (300 mil) SOIC (51-8502 6) 51 85127 *A PIN 1 ID 0.291[7.39] 0.300[7.62] 0.394[10.01] 0.419[10.64] 0.050[1.27] TYP. 0.092[2.33] 0.105[2.67] 0.004[0.10] 0.0118[0.30] SEATING PLANE 0.0091[0.23] 0.0125[3.17] 0.015[0.38] 0.050[1.27] 0.013[0.33] 0.019[0.48] 0.0 ...
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Cypress STK15C88 - page 14
STK15C88 Document Number: 001-50593 Rev . ** Page 14 of 15 Figure 12. 28-Pin (330 mil) SOIC (51-85 058 ) Package Diagrams (continued) 51-85058-*A [+] Feedback ...
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Cypress STK15C88 - page 15
Document Number: 001-50593 Rev . ** Revised January 29, 20 09 Page 15 of 15 AutoS tore and Qua ntumTr ap are registered tr ademarks of Cypress Se miconductor Corpor ation. All produ cts and comp any names mentio ned in this docum ent may be the trade marks of t heir respe ctive holders. STK15C88 © Cypress Semicondu ctor Corpor ation, 2008-200 9. T ...
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