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Part Name
Description
UPD7554AA View Datasheet(PDF) - NEC => Renesas Technology
Part Name
Description
Manufacturer
UPD7554AA
4-BIT SINGLE-CHIP MICROCOMPUTER
NEC => Renesas Technology
UPD7554AA Datasheet PDF : 64 Pages
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µ
PD7554A, 7554A(A)
1.5 PIN INPUT/OUTPUT CIRCUITS
This section presents the input/output circuit for each pin of the
µ
PD7554A in a partly simplified format:
(1) Type A (for Type W)
V
DD
P–ch
IN
N–ch
Forming an input buffer conformable to the CMOS specification
(2) Type D (for Types W and X)
V
DD
data
output
disable
P–ch
OUT
N–ch
Forming a push-pull output which becomes high impedance (with both P-ch and N-ch off) in response to
RESET input
9
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