IDT71321 데이터 시트보기 (PDF) - Integrated Device Technology
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IDT71321 Datasheet PDF : 13 Pages
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IDT71321SA/LA AND IDT71421SA/LA
HIGH-SPEED 2K x 8 DUAL-PORT STATIC RAM WITH INTERRUPTS
COMMERCIAL TEMPERATURE RANGE
TIMING WAVEFORM OF WRITE CYCLE NO. 1, (R/W CONTROLLED TIMING)(1,5,8)
tWC
ADDRESS
OE
CE
R/W
DATA OUT
DATA IN
tAS (6)
(4)
tAW
tWZ (7)
tWP (2)
tDW
tWR(3)
tOW
tDH
TIMING WAVEFORM OF WRITE CYCLE NO. 2, (CE CONTROLLED TIMING)(1,5)
tWC
ADDRESS
CE
R/W
(6)
tAS
tAW
tEW (2)
tDW
tWR(3)
tDH
DATA IN
tHZ (7)
(7)
tHZ
(4)
2691 drw 08
NOTES:
1. R/W or CE must be High during all address transitions.
2691 drw 09
2. A write occurs during the overlap (tEW or tWP) of CE = VIL and R/W= VIL.
3. tWR is measured from the earlier of CE or R/W going High to the end of the write cycle.
4. During this period, the l/O pins are in the output state and input signals must not be applied.
5. If the CE 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 (CE or R/W) is asserted last.
7. This parameter is determined be device characterization, but is not production tested. Transition is measured +/- 500mV from steady state
with the Output Test Load (Figure 2).
8. If OE is Low during a 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
data to be placed on the bus for the required tDW. If OE is High during a R/W controlled write cycle, this requirement does not apply and the
write pulse can be as short as the specified tWP.
6.03
7
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