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UPD43257BGU-85L-A Datasheet(PDF) 11 Page - NEC

Part # UPD43257BGU-85L-A
Description  MOS INTEGRATED CIRCUIT 256K-BIT CMOS STATIC RAM 32K-WORD BY 8-BIT
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD43257BGU-85L-A Datasheet(HTML) 11 Page - NEC

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Data Sheet M10693EJ9V0DS
11
μPD43257B
Write Cycle Timing Chart 1 (/WE Controlled)
tWC
tCW1
tWHZ
tDW
tDH
tOW
Indefinite data out
High
impe-
dance
High
impe-
dance
Data in
Indefinite data out
Address (Input)
/CE1 (Input)
I/O (Input / Output)
CE2 (Input)
tCW2
tAW
tWP
tAS
tWR
/WE (Input)
Cautions 1. During address transition, at least one of pins /CE1, CE2, /WE should be inactivated.
2. When I/O pins are in the output state, therefore the input signals must not be applied to
the output.
Remarks 1. Write operation is done during the overlap time of a low level /CE1, /WE and a high level CE2.
2. If /CE1 changes to low level at the same time or after the change of /WE to low level, or if CE2
changes to high level at the same time or after the change of /WE to low level, the I/O pins will
remain high impedance state.
3. When /WE is at low level, the I/O pins are always high impedance. When /WE is at high level,
read operation is executed. Therefore /OE should be at high level to make the I/O pins high
impedance.


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