Cypress STK17T88 STK17T88

STK17T88

Document Number: 001-52040 Rev. *A Page 8 of 22

AutoStore/Power Up RECALL

Figure 9. AutoStore Power Up RECALL

Notes

9. tHRECALL starts from the time VCC rises above VSWITCH

10. If an SRAM WRITE has not taken place since the last nonvolatile cycle, no STORE will take place

11. Industrial Grade Devices require 15 ms Max.

NO. Symbols Parameter STK17T88 Units Notes

Standard Alternate Min Max

22 tHRECALL Power up RECALL Duration 40 ms 9

23 tSTORE tHLHZ STORE Cycle Duration 12.5 ms 10, 11

24 VSWITCH Low Voltage Trigger Level 2.65 V

25 VCCRISE VCC Rise Time 150 µS

NOTE: Read and Write cycles will be ignored during STORE, RECALL and while VCC is below VSWITCH

23 23

22 22

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Contents

Main STK17T88 32K x 8 AutoStore nvSRAM with Real Time Clock Features Description Logic Block Diagram Document Number: 001-52040 Rev. *A Page 2 of 22 Pin Configurations [+] Feedback Figure 1. 48-Pin SSOP (TOP) Note 1. For detailed package size specifications, see Package Diagram on page 21. Absolute Maximum Ratings RF (SSOP-48) Package Thermal Characteristics DC Characteristics AC Test Conditions Capacitance DC Characteristics RTC DC Characteristics SRAM READ Cycles #1 and #2 STK17T88 Document Number: 001-52040 Rev. *A Page 7 of 22 [+] Feedback SRAM WRITE Cycles #1 and #2 Figure 7. SRAM WRITE Cycle #1: W Controlled[7, 8] STK17T88 AutoStore/Power Up RECALL Software-Controlled STORE/RECALL Cycle Document Number: 001-52040 Rev. *A Page 10 of 22 Hardware STORE Cycle Soft Sequence Commands 31 tDELAY tHLQZ Hardware STORE to SRAM Disabled 1 70 s14 32 tHLHX Hardware STORE Pulse Width 15 ns 33 tSS Soft Sequence Processing Time 70 s 15, 16 MODE Selection nvSRAM Operation SRAM READ SRAM WRITE AutoStore Operation Hardware STORE (HSB) Operation Software STORE Software RECALL Data Protection Noise Considerations Preventing AutoStore Real Time Clock Reading the Clock Setting the Clock Backup Power Stopping and Starting the RTC Oscillator Interrupts Interrupt Register Flags Register STK17T88 RTC Register Map Page Register Map Detail Ordering Codes Register Map Detail Commercial and Industrial Ordering Information STK17T88 - R F 45 I TR Page Document History Page Sales, Solutions, and Legal Information Worldwide Sales and Design Support Products PSoC Solutions