74abt648pw NXP Semiconductors, 74abt648pw Datasheet - Page 5

• Manufacturer Part Number: 74abt648pw
• Description: Octal Transceiver/register, Inverting 3-state
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7. Functional description
Table 4:
[1]
[2]
9397 750 14858
Product data sheet
Operating mode
Store A or B
Store A, B unspecified
Store B, A unspecified
Store A and B
Store A and B data
Isolation, hold storage
B data to A bus
Real time B data to A bus
Stored B data to A bus
A data to B bus
Real time A data to B bus
Stored A data to B bus
H = HIGH voltage level;
L = LOW voltage level;
X = don’t care;
The data output function may be enabled or disabled by various signals at the OE input. Data input functions are always enabled, i.e.,
data at the bus pins will be stored on every LOW-to-HIGH transition of the clock.
= LOW-to-HIGH clock transition.
Function table
7.1 Function table
Table 3:
Symbol
SBA
CPBA
V
CC
[1]
Input
OE
X
X
H
H
L
L
L
L
Pin description
DIR
X
X
X
X
L
L
H
H
Pin
22
23
24
CPAB
X
H or L
X
X
X
H or L
Rev. 04 — 27 April 2005
…continued
Description
B to A select input
B to A clock input
supply voltage
CPBA
X
H or L
X
H or L
X
X
Octal transceiver/register; inverting; 3-state
SAB
X
X
X
X
X
X
L
H
SBA
X
X
X
X
L
H
X
X
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Data I/O
An
input
unspecified
output
input
output
input
74ABT648
[2]
Bn
unspecified
output
input
input
input
output
[2]
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