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70T653MS15BCG8 Datasheet(PDF) 11 Page - Integrated Device Technology

Part # 70T653MS15BCG8
Description  HIGH-SPEED 2.5V 512K x 36 ASYNCHRONOUS DUAL-PORT STATIC RAM
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

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IDT70T653M
High-Speed 2.5V 512K 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(1,5,8)
NOTES:
1. R/W or CE or BEn = VIH during all address transitions for Write Cycles 1 and 2.
2. A write occurs during the overlap (tEW or tWP) of a CE = VIL, BEn = VIL, and a R/W = VIL for memory array writing cycle.
3. tWR is measured from the earlier of CE, BEn 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 1).
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. CE = VIL when CE0 = VIL
and CE1 = VIH. CE = VIH when CE0 = VIH and/or CE1 = VIL.
R/
W
tWC
tHZ
tAW
tWR
tAS
tWP
DATAOUT
(2)
tWZ
tDW
tDH
tOW
OE
ADDRESS
DATAIN
CE or SEM
(9)
(6)
(4)
(4)
(3)
5679 drw 10
(7)
(7)
tLZ
,
tHZ
(7)
(7)
BEn
(9)
5679 drw 11
tWC
tAS
tWR
tDW
tDH
ADDRESS
DATAIN
R/
W
tAW
tEW
BEn
(3)
(2)
(6)
CE or SEM
(9)
(9)
.
.


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