74LVC646A 데이터 시트보기 (PDF) - Philips Electronics
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74LVC646A Datasheet PDF : 16 Pages
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Philips Semiconductors
Octal bus transceiver/register (3-State)
Product specification
74LVC646A
PIN CONFIGURATION
CP AB 1
S AB 2
DIR 3
A0 4
A1 5
A2 6
A3 7
A4 8
A5 9
A 6 10
A 7 11
GND 12
24 V CC
23 CP BA
22 S BA
21 OE
20 B 0
19 B 1
18 B 2
17 B 3
16 B 4
15 B 5
14 B 6
13 B 7
PIN DESCRIPTION
PIN NUMBER SYMBOL
1
CPAB
2
SAB
3
DIR
4, 5, 6, 7, 8,
9, 10, 11
A0 to A7
12
GND
20, 19, 18, 17,
16, 15, 14, 13
B0 to B7
21
OE
22
SBA
23
CPBA
24
VCC
FUNCTION
‘A’ to ‘B’ clock input
(LOW-to-HIGH, edge-triggered)
Select ‘A’ to ‘B’ source input
Direction control input
‘A’ data inputs/outputs
Ground (0V)
‘B’ data inputs/outputs
Output enable input (active LOW)
Select ‘B’ to ‘A’ source input
‘B’ to ‘A’ clock input
(LOW-to-HIGH, edge-triggered)
Positive supply voltage
SV00766
FUNCTION TABLE
INPUTS
DATA I/O *
OE
DIR
CPAB CPBA
SAB
SBA
X
X
↑
X
X
X
X
X
X
↑
X
X
A0 to A7
input
un *
H
X
↑
↑
X
X
H
X
H or L H or L
X
X
input
L
L
X
X
X
L
L
L
X
H or L
X
H
output
L
H
X
X
L
X
L
H
H or L
X
H
X
input
* 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
B0 to B7
un *
input
input
input
output
FUNCTION
store A, B unspecified *
store B, A unspecified *
store A and B data,
isolation hold storage
real-time B data to A bus
stored B data to A bus
real-time A data to B bus
stored A data to B bus
1998 Jul 29
3
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