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74HC646 Fiches technique(PDF) 4 Page - NXP Semiconductors

No de pièce 74HC646
Description  Octal bus transceiver/register; 3-state
Download  12 Pages
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74HC646 Fiches technique(HTML) 4 Page - NXP Semiconductors

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September 1993
4
Philips Semiconductors
Product specification
Octal bus transceiver/register; 3-state
74HC/HCT646
Fig.4 Functional diagram.
FUNCTION TABLE
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
↑ = LOW-to-HIGH level transition
2. The data output functions may be enabled or disabled by various signals at the OE and DIR inputs. Data input
functions are always enabled, i.e., data at the bus inputs will be stored on every LOW-to-HIGH transition on the clock
inputs.
INPUTS (1)
DATA I/O (2)
FUNCTION
OE
DIR
CPAB
CPBA
SAB
SBA
A0 to A7
B0 to B7
H
H
X
X
H or L
H or L
X
X
X
X
input
input
isolation
store A and B data
L
L
L
L
X
X
X
H or L
X
X
L
H
output
input
real-time B data to A bus
stored B data to A bus
L
L
H
H
X
H or L
X
X
L
H
X
X
input
output
real-time A data to B bus
stored A data to B bus


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