74lvc646a NXP Semiconductors, 74lvc646a Datasheet - Page 7

• Manufacturer Part Number: 74lvc646a
• Description: Octal Bus Transceiver/register 3-state
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7. Functional description
8. Limiting values
9397 750 13249
Product data sheet
7.1 Function table
Table 3:
Table 4:
[1]
[2]
Table 5:
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to
GND (ground = 0 V).
Symbol
SBA
CPBA
V
Input
OE
X
X
H
H
L
L
L
L
Symbol
V
I
V
I
V
I
IK
OK
O
CC
CC
I
O
un = unspecified;
H = HIGH voltage level;
L = LOW voltage level;
X = don’t care;
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.
= LOW-to-HIGH level transition.
DIR
X
X
X
X
L
L
H
H
Parameter
supply voltage
input diode current
input voltage
output diode current
output voltage
output source or sink current V
Pin description
Function table
Limiting values
CPAB
X
H or L
X
X
X
H or L
Pin
22
23
24
CPBA
X
H or L
X
H or L
X
X
Rev. 04 — 29 June 2004
[1]
…continued
SAB
X
X
X
X
X
X
L
H
Description
B to A select source input
B to A clock input (LOW-to-HIGH, edge-triggered)
supply voltage
SBA
X
X
X
X
L
H
X
X
Conditions
V
V
output HIGH or LOW state
output 3-state
I
O
O
< 0 V
> V
= 0 V to V
Data I/O
A0 to A7 B0 to B7
input
un
input
input
output
output
input
input
CC
[2]
or V
Octal bus transceiver/register; 3-state
CC
O
< 0 V
un
input
input
input
input
input
output
output
[2]
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
[1]
[1]
[1]
Function
store A and B unspecified
store B and A unspecified
store A and B data
hold storage; isolation
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
74LVC646A
Min
-
-
-
0.5
0.5
0.5
0.5
Max
+6.5
+6.5
V
+6.5
50
50
50
CC
+ 0.5 V
7 of 24
Unit
V
mA
V
mA
V
mA