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CD54HC646F3A Fiches technique(PDF) 2 Page - Texas Instruments

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No de pièce CD54HC646F3A
Description  OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
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CD54HC646F3A Fiches technique(HTML) 2 Page - Texas Instruments

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CD54HC646, CD74HCT646
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCHS278B – APRIL 2003 – REVISED APRIL 2003
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
FUNCTION TABLE
INPUTS
DATA I/O
OPERATION OR FUNCTION
OE
DIR
CLKAB
CLKBA
SAB
SBA
A1– A8
B1– B8
OPERATION OR FUNCTION
X
X
X
X
X
Input
Unspecified†
Store A, B unspecified†
X
XX
X
X
Unspecified†
Input
Store B, A unspecified†
H
X
X
X
Input
Input
Store A and B data
H
X
H or L
H or L
X
X
Input disabled
Input disabled
Isolation, hold storage
L
L
X
X
X
L
Output
Input
Real-time B data to A bus
L
L
X
H or L
X
H
Output
Input
Stored B data to A bus
L
H
X
X
L
X
Input
Output
Real-time A data to B bus
L
H
H or L
X
H
X
Input
Output
Stored A data to B bus
† The data-output functions can be enabled or disabled by various signals at OE and DIR. Data-input functions always are enabled; i.e., data at
the bus terminals is stored on every low-to-high transition of the clock inputs.


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