參數(shù)資料
型號(hào): μPD26401
廠(chǎng)商: NEC Corp.
英文描述: 1M-Bit SRAM and 2M-Bit MASK ROM COMBO Chip(1M位SRAM 和2M位MASK ROM)
中文描述: 100萬(wàn)位的SRAM和2M位掩膜ROM集成芯片(100萬(wàn)位的SRAM和200萬(wàn)位掩膜ROM)
文件頁(yè)數(shù): 4/20頁(yè)
文件大?。?/td> 119K
代理商: ΜPD26401
4
μ
PD26401
Block Diagram
A0
to
A16
/ROMCS
A17
A0
to
A16
/RAMCS
/ROMCS
/WE
/OE
/RAMCS
A0 to A17
I/O1 to I/O8
V
CC
GND
Data buffer
Mask ROM
2,097,152 bits
SRAM
1,048,576 bits
Input / Logic
Input / Logic
Address buffer
/WE
Truth Table
Address (A0 to A17)
/ROMCS
/RAMCS
/WE
/OE
I/O1 to I/O8
Mode
x
H
H
x
x
High impedance
Standby
L
L
x
x
A0 to A17
L
H
x
H
High impedance
Output floating
L
H
x
L
Data out
ROM read
Only A0 to A16 are valid
H
L
H
H
High impedance
Output floating
H
L
H
L
Data out
RAM read
H
L
L
x
Data in
RAM write
Remark
H: High level, L: Low level, x: Don’t care
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