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參數資料
型號: 70V659S15DR
廠商: INTEGRATED DEVICE TECHNOLOGY INC
元件分類: SRAM
英文描述: 128K X 36 DUAL-PORT SRAM, 15 ns, PQFP208
封裝: 28 X 28 MM, 3.50 MM HEIGHT, PLASTIC, QFP-208
文件頁數: 5/24頁
文件大小: 316K
代理商: 70V659S15DR
13
IDT70V659/58/57S
High-Speed 3.3V 128/64/32K x 36 Asynchronous Dual-Port Static RAM
Industrial and Commercial Temperature Ranges
Timing Waveform of Write Cycle No. 1, R/W Controlled Timing(1,5,8)
Timing Waveform of Write Cycle No. 2, CE Controlled Timing(1,5)
NOTES:
1. R/W or CE or BEn = VIH during all address transitions.
2. A write occurs during the overlap (tEW or tWP) of a CE = VIL and a R/W = VIL 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 = VIL transition occurs simultaneously with or after the R/W = VIL 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 = VIL 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 = VIH 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.
R/
W
tWC
tHZ
tAW
tWR
tAS
tWP
DATAOUT
(2)
tWZ
tDW
tDH
tOW
OE
ADDRESS
DATAIN
(6)
(4)
(7)
BEn
4869 drw 08
(9)
CE or SEM
(9)
(7)
(3)
4869 drw 09
tWC
tAS
tWR
tDW
tDH
ADDRESS
DATAIN
R/
W
tAW
tEW
BEn
(3)
(2)
(6)
CE or SEM
(9)
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