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70V639S12PRFG8 Datasheet(PDF) 11 Page - Integrated Device Technology |
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70V639S12PRFG8 Datasheet(HTML) 11 Page - Integrated Device Technology |
11 / 24 page IDT70V639S High-Speed 3.3V 128K x 18 Asynchronous Dual-Port Static RAM Industrial and Commercial Temperature Ranges 11 Timing of Power-Up Power-Down Waveform of Read Cycles(5) NOTES: 1. Timing depends on which signal is asserted last, OE, CE, LB or UB. 2. Timing depends on which signal is de-asserted first CE, OE, LB or UB. 3. tBDD delay is required only in cases where the opposite port is completing a write operation to the same address location. For simultaneous read operations BUSY has no relation to valid output data. 4. Start of valid data depends on which timing becomes effective last tAOE, tACE, tAA or tBDD. 5. SEM = VIH. tRC R/ W CE ADDR tAA OE UB, LB 5621 drw 06 (4) tACE (4) tAOE (4) tABE (4) (1) tLZ tOH (2) tHZ (3,4) tBDD DATAOUT BUSYOUT VALID DATA (4) (6) CE 5621 drw 07 tPU ICC ISB tPD 50% 50% . |
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