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IDT70V27S Datasheet(PDF) 11 Page - Integrated Device Technology |
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IDT70V27S Datasheet(HTML) 11 Page - Integrated Device Technology |
11 / 21 page Commercial and Industrial Temperature Range IDT 70V27S/L High-Speed 3.3V 32K x 16 Dual-Port Static RAM 11 Timing Waveform of Write Cycle No. 1, R/W Controlled Timing(1,5,8) NOTES: 1. R/W or CE or UB and LB must be HIGH during all address transitions. 2. A write occurs during the overlap (tEW or tWP) of a LOW CE and a LOW R/W for memory array writing cycle. 3. tWR is measured from the earlier of CE or R/W (or SEM or R/W) going HIGH to the end of write cycle. 4. During this period, the I/O pins are in the output state and input signals must not be applied. 5. If the CE or SEM LOW transition occurs simultaneously with or after the R/W LOW transition, the outputs remain in the High-impedance state. 6. Timing depends on which enable signal is asserted last, CE or R/W. 7. This parameter is guaranteed by device characterization, but is not production tested. Transition is measured 0mV from steady state with the Output Test Load (Figure 2). 8. If OE is LOW during R/W controlled write cycle, the write pulse width must be the larger of tWP or (tWZ + tDW) to allow the I/O drivers to turn off and data to be placed on the bus for the required tDW. If OE is HIGH during an R/W controlled write cycle, this requirement does not apply and the write pulse can be as short as the specified tWP. 9. To access RAM, CE = VIL and SEM = VIH. To access semaphore, CE = VIH and SEM = VIL. tEW must be met for either condition. 10. Refer to Chip Enable Truth Table. Timing Waveform of Write Cycle No. 2, CE, UB, LB Controlled Timing(1,5) R/ W tWC tHZ tAW tWR tAS tWP DATAOUT (2) tWZ tDW tDH tOW OE ADDRESS DATAIN (6) (4) (4) (7) UB or LB 3603 drw 07 (9) CE or SEM (9,10) (7) (3) 3603 drw 08 tWC tAS tWR tDW tDH ADDRESS DATAIN R/ W tAW tEW UB or LB (3) (2) (6) CE or SEM (9,10) (9) |
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