harman kardon HD 29412 Service Manual
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HD29412
Dual Differential Line Drivers With 3 State Outputs
The HD29412 features dual differential line drivers
with three state out puts designed to satisf y the
requirements of EIA–422. Each driver has an
output control is low, the associated outputs are in a
high impedance state. This permits many deviced
to be connected together on the same transmission
line for party line applications.
Function Table
Input
A
HH
H
L
LL
X
X
:
High level
H
:
Low level
L
:
Irrelevant
X
:
High impedance
Z
B
L
H
X
X
C
H
H
H
H
L
X
D
H
H
H
H
X
L
Output
Y
H
L
L
L
Z
Z
Z
L
H
H
H
Z
Z
Pin Arrangement
1
2
1Z
3
1Y
1A
4
5
1B
6
1C
GND
7
(Top View)
14NC
13
12
11
10
VCC
2Z
2Y
2B
2A
2C
9
8
D
HD29412
Absolute Maxim um Ra tings
CC
Symbol
V
CC
VIN
PT
Topr
Tstg
Item
Supply Voltage
Input Voltage
Power Dissipation
Operating Temperature
Storage Temperatur e
Notes: 1. The values is define d as of grou nd terminal.
2. The absolute maximum ratings are values which must not individually be exceeded,
and furthermore, no two of whi ch may be realized at the same time.
Recommended Operating Conditions
Item
Supply Voltage
Output Current
Operating Temperature
Symbol
V
IOH
OL
I
Topr
Ratings
*1
7
5.5
1150
0 to + 70
–65 to + 150
Min
Typ Max
4.75 5.00 5.25
0
–40
40
70
HD29412
Unit
V
V
mW
°C
°C
Unit
V
mA
mA
°C
Electrical Characteristics (Ta = 0 to +70°C)
Item Symbol Unit Conditions
Input Voltage
Input Clamp Voltage
Output Voltage
Output Clamp Voltage
V
IH
VIL
VIK
OH
V
VOL
VOK
V
CC = 4.75 V, II = –12 mA
CC = 4.75 V, VIL = 0.8 V
V
IH = 2 V, IOH = –40 mA
V
CC = 4.75 V, VIL = 0.8 V
V
IH = 2 V,IOL = 40 mA
V
VCC = 5.25 V, IO = –40 mA
Min
2
2.5
Typ
*1
Max
V
0.8
–1.5
V
V
0.5
–1.5
V
2
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