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UPD23C256112A Datasheet(PDF) 7 Page - NEC

Part No. UPD23C256112A
Description  NAND INTERFACE 256M-BIT MASK-PROGRAMMABLE ROM
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Maker  NEC [NEC]
Homepage  http://www.nec.com/
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UPD23C256112A Datasheet(HTML) 7 Page - NEC

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Data Sheet M15902EJ2V0DS
7
µPD23C256112A
Operation Modes
Command input, address input, and serial read are all performed from I/O pins, and the respective statuses are
controlled by the CLE, ALE, /WE, /RE, and /CE signals.
CLE
ALE
I/O0 to I/O7
Command
input cycle
Address input cycle
Serial read cycle
Busy
/CE
/WE
/RE
R, /B
High-Z
High-Z
High-Z
Operation mode
Mode
CLE
ALE
/CE
/WE
/RE
Command input cycle
H
L
L
H
Address input cycle
L
H
L
H
Serial read cycle
L
L
L
H
Operation mode during serial read
Mode
CLE
ALE
/CE
/WE
/RE
I/O0 to I/O7
Data output
L
L
L
H
L
Data output
Output High-Z
L
L
L
H
H
High-Z
Standby
L
L
H
H
×
High-Z
Remark
× : VIH or VIL


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