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74LVC646A Datasheet(PDF) 3 Page - NXP Semiconductors

Part No. 74LVC646A
Description  Octal bus transceiver/register 3-State
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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74LVC646A Datasheet(HTML) 3 Page - NXP Semiconductors

 
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Philips Semiconductors
Product specification
74LVC646A
Octal bus transceiver/register (3-State)
1998 Jul 29
3
PIN CONFIGURATION
SV00766
1
2
3
4
5
6
7
8
9
10
11
12
CP AB
S AB
DIR
A 0
A 1
A 2
A 3
A 4
A 5
A 6
A 7
GND
V CC
CP BA
S BA
OE
B 0
B 1
B 2
B 3
B 4
B 5
B 6
B 7
24
23
22
21
20
19
18
17
16
15
14
13
PIN DESCRIPTION
PIN NUMBER
SYMBOL
FUNCTION
1
CPAB
‘A’ to ‘B’ clock input
(LOW-to-HIGH, edge-triggered)
2
SAB
Select ‘A’ to ‘B’ source input
3
DIR
Direction control input
4, 5, 6, 7, 8,
9, 10, 11
A0 to A7
‘A’ data inputs/outputs
12
GND
Ground (0V)
20, 19, 18, 17,
16, 15, 14, 13
B0 to B7
‘B’ data inputs/outputs
21
OE
Output enable input (active LOW)
22
SBA
Select ‘B’ to ‘A’ source input
23
CPBA
‘B’ to ‘A’ clock input
(LOW-to-HIGH, edge-triggered)
24
VCC
Positive supply voltage
FUNCTION TABLE
INPUTS
DATA I/O *
FUNCTION
OE
DIR
CPAB
CPBA
SAB
SBA
A0 to A7
B0 to B7
FUNCTION
X
X
X
X
X
X
X
X
X
X
input
un *
un *
input
store A, B unspecified *
store B, A unspecified *
H
H
X
X
H or L
H or L
X
X
X
X
input
input
store A and B data,
isolation hold storage
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
*
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.
un
= unspecified
H
= HIGH voltage level
L
= LOW voltage level
X
= Don’t care
= LOW-to-HIGH level transition


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