HD26C31
Quadruple Differential Line Drivers With 3 State Outputs
ADE-205-574 (Z)
1st. Edition
Dec. 2000
Description
The HD26C31 features quadruple differential line drivers which satisfy the requirements of EIA standard
RS-422A. This device is designed to provide differential signals with high current capability on bus lines.
The circuit provides enable input to control all four drivers. The output circuit has active pull up and pull
down and is capable of sinking or sourcing 20 mA.
Features
TTL input compatibility
Propagation delay time: 6 ns typ
Output to output skew: 0.5 ns typ
High output impedance in power off conditions
Meets EIA standard RS-422A
Operates from a single 5 V supply
Three state outputs
Low power dissipation with CMOS process
Power up and power down protection
Pin to pin compatible with HD26LS31
HD26C31
2
Pin Arrangement
(Top view)
1
2
3
4
5
6
7
1A
GND
1Y
1Z
2Z
8
Enable G
2Y
2A
13
14
15
10
11
12
9
16 V
CC
4A
4Y
4Z
Enable G
3Z
3Y
3A
Function Table
Input
Enables
Outputs
A
G
G
Y
Z
H
H
X
H
L
L
H
X
L
H
H
X
L
H
L
L
X
L
L
H
X
L
H
Z
Z
H :
High level
L
:
Low level
X :
Irrelevant
Z
:
High impedance
HD26C31
3
Absolute Maximum Ratings (Ta = 25C)
Item
Symbol
Ratings
Unit
Supply Voltage*
2
V
CC
0.5 to 7.0
V
Input Voltage
V
IN
1.5 to V
CC
+1.5
V
Output Voltage
V
OUT
0.5 to V
CC
+0.5
V
Power Dissipation
P
T
500
mW
Storage Temperature Range
Tstg
65 to 150
C
Lead Temperature*
3
Tlead
260
C
Output Current
I
OUT
150
mA
Supply Current
I
CC
150
mA
Notes: 1. The absolute maximum ratings are values which must not individually be exceeded, and
furthermore, no two of which may be realized at the same time.
2. The values is defined as of ground terminal.
3. The values at 1.6 mm away from the package within 10 second, when soldering.
Recommended Operating Conditions (Ta = 40C to +85C)
Item
Symbol
Min
Typ
Max
Unit
Supply Voltage
V
CC
4.5
5.0
5.5
V
Input Voltage
V
IN
0
--
V
CC
V
Output Voltage
V
OUT
0
--
V
CC
V
Operating Temperature
Ta
40
25
85
C
Input Rise/Fall Time*
1
t
r
, t
f
--
--
500
ns
Note:
1. This guarantees maximum limit when one input switches.
HD26C31
4
Logic Diagram
1Y
1Z
1A
2Y
2Z
2A
3Y
3Z
3A
4Y
4Z
4A
Enable G
Enable G
HD26C31
5
Electrical Characteristics (Ta = 40C to +85C)
Item
Symbol
Min
Typ
Max
Unit
Conditions
Input Voltage
V
IH
2.0
--
--
V
V
IL
--
--
0.8
V
Output Voltage
V
OH
2.4
3.4
--
V
V
IN
= V
IH
or V
IL
, I
OH
= 20 mA
V
OL
--
0.2
0.4
V
V
IN
=V
IH
or V
IL
, I
OL
= 20 mA
Differential Output Voltage
V
T
2.0
3.1
--
V
R
L
= 100
50
50
V
T
V
OS
Difference In Differential
Output
IV
T
I IV
T
I
--
--
0.4
V
Common ModeOutput
Voltage
V
OS
--
1.8
3.0
V
Difference In Output
Common Mode
IV
OS
V
OS
I --
--
0.4
V
Input Current
I
IN
--
--
1.0
A
V
IN
= V
CC
, GND, V
IH
or V
IL
Supply Current
I
CC
--
200
500
A
I
OUT
= 0
A, V
IN
= V
CC
or GND
I
CC
*
2
--
0.8
2.0
mA
I
OUT
=0
A, V
IN
= 2.4 V or 0.5 V
Off State Output Current
I
OZ
--
0.5
5.0
A
V
OUT
= V
CC
or GND,
G
= V
IL
, G = V
IH
Short Circuit Output Current I
SC
*
3
30
--
150 mA
V
IN
= V
CC
or GND
Output Current with Power
I
OFF
--
--
100
A
V
CC
= 0 V, V
OUT
= 6 V
Off
I
OFF
--
--
100
A
V
CC
= 0 V, V
OUT
= 0.25 V
Notes: 1. All typical values are at V
CC
= Ta = 25
C.
2. 1 input: V
IN
= 2.4 V or 0.5 V, other inputs: V
IN
= V
CC
or GND
3. Not more than one output should be shorted at a time and duration of the short circuit should not
exceed one second.
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