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HD74HC646 Datasheet(HTML) 2 Page - Hitachi Semiconductor

Part No. HD74HC646
Description  Octal Bus Transceivers/Registers with Multiplexed 3-state outputs
Download  10 Pages
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Maker  HITACHI [Hitachi Semiconductor]
Homepage  http://www.renesas.com/eng
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HD74HC646 Datasheet(HTML) 2 Page - Hitachi Semiconductor

 
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background image
HD74HC646/HD74HC648
2
Function Table
Inputs
Control
Clock
Select
Data I/O
Data I/O
Operation or Function
G
Direction BA AB AB
BA A1 thru A8 B1 thru B8 HD74HC646
HD74HC648
H
X
X
X
X
X
Z (Input)
Z (Input)
Isolation
Isolation
HX
H
H
Z (Input)
Z (Input)
Store A & B data
Store
A & B data
L
L
X
X
X
L
Output
Z (Input)
B real-time data to
A bus
B real-time data to
A bus
L
L
H
H
X
H
Output
Z (Input)
B stored data to A
bus
B stored data to A
bus
L
L
LLXH
Output
Z (Input)
B stored data to A
bus
B stored data to A
bus
L
H
X
X
L
X
Z (Input)
Output
A real-time data to
B bus
A real-time data to
B bus
L
H
H
H
H
X
Z (Input)
Output
A stored data to B
bus
A stored data to B
bus
L
H
L
L
H
X
Z (Input)
Output
A stored data to B
bus
A stored data to B
bus
Real-time transfer
Bus B to Bus A
Real-time transfer
Bus A to Bus B


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