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UPD23C256112A Datasheet(PDF) 22 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) 22 Page - NEC

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Data Sheet M15902EJ2V0DS
22
µPD23C256112A
ID Read
To recognize the ID code (maker code / device code) of this device in a system, execute the ID read command.
The ID code can be read with the following timing.
CLE
tCLS
90H
10H
tCLH
tCS
tCH
tDS
tDH
tREAID
tCLS
58H
00H
ALE
tREAID
tRP
tREH
tDS
tDH
tCS
tCH
tCR
tALS
tALH
tWP
tALH
tAR1
tRC
/CE
/WE
/RE
Maker code
Device code
I/O0 to I/O7
High-Z
I/O7
I/O6
I/O5
I/O4
I/O3
I/O2
I/O1
I/O0
HEX
Maker code
L
L
L
H
L
L
L
L
10H
Device code
L
H
L
H
H
L
L
L
58H
Cautions 1. If the /RE clock is input after the maker code and device code are output, the output data is not
guaranteed. Therefore, do not input the /RE clock following device code output.
2. Do not input an address other than 00H after setting the ID read command (90H). If an address other
than 00H is input, the data following /RE clock input is not guaranteed.


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