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74HC648 Datasheet(PDF) 4 Page - NXP Semiconductors

Part No. 74HC648
Description  Octal bus transceiver/register; 3-state; inverting
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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74HC648 Datasheet(HTML) 4 Page - NXP Semiconductors

 
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December 1990
4
Philips Semiconductors
Product specification
Octal bus transceiver/register; 3-state;
inverting
74HC/HCT648
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
Fig.4 Functional diagram.


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