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HD29050www.DataSheet4U.com
Dual Differential Line Drivers / ReceiversWith 3 State Outputs
The HD29050 features differential line drivers /
receivers with three state output designed to meet
the spec of EIA RS – 422A and 423A. Each device
has two drivers / receivers in a 16 pin package.
The device becomes in enable state when active
high for a driver and active low for a receiver.
Features
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Driver
• Built in current restriction when short circuit
• Power up / down protection.
• High output current
I OH = –40 mA
IOL = 40 mA
Receiver
• Input hysteresis (Typ. 50 mV)
• In phase input voltage ±200 mV of input
sensitivity in the range –7 to +12 V.
Pin Arrangement
R1B 1
R1A 2
R1Y 3
R
Enable
4
R2Y 5
R2A 6
R2B 7
GND 8
16 VCC
15 D1A
14 D1Y
13 D1Z
12 D
Enable
11 D2Z
10 D2Y
9 D2A
(Top View)
Function Table
Drivers
Input A
Enable
Output Y
LHL
HH
H
XL
Z
Output Z
H
L
Z
Receivers
Differential Input A – B
VID ≥ 0.2 V
Enable
L
–0.2 V < VID < 0.2 V
VID ≤ –0.2 V
L
L
XH
H : High level
L : Low level
Z : High impedance
X : Immaterial
? : Irrelevant
Output Y
H
?
L
Z
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HD29050www.DataSheet4U.com
Electrical Characteristics (Ta = 0 to +70°C)
Receiver
HD29050
Item
Differential Input *2
Threshold Voltage
Symbol
VTHR
Min
Typ
–0.2
Input Current
IIBR
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VOHR
2.7
VOLR
Output Leak Current
IOZR
–100
Short Circuit Output *1 IOSR
Current
Input Voltage
Input Current
Input Clamp Voltage
VIHE
VILE
IILE
IIHE
IIE
VIKE
–100
–15
2.0
Max
0.2
1.0
–0.8
0.45
Unit Conditions
V VO ≥ 2.7 V
–7.0 V < VIC < 12 V
V VO ≤ 0.45 V
–7.0 V < VIC < 12 V
mA VIN = 12 V
0 V ≤ VCC ≤ 5.25 V
mA VIN = –7 V
0 V ≤ VCC ≤ 5.25 V
V VCC = 4.75 V, IO = –400 µA
VID = 0.4 V, –7.0 V < V ICM < 12 V
V VCC = 4.75 V, IO = 8.0 mA
VID = –0.4 V, –7.0 V < V ICM < 2 V
100 µA VCC = 5.25 V, VO = 0.4 V
VID = 3.0 V, Enable = 2.0 V
100 µA VCC = 5.25 V, VO = 2.4 V
VID = –3.0 V, Enable = 2.0 V
–85 mA VCC = 5.25 V, VO = 0 V
VID = 3.0 V
0.8
–100
20
100
–1.5
V
V
µA VCC = 5.25 V, VIL = 0.4 V
µA VCC = 5.25 V, VIH = 2.7 V
µA VCC = 5.25 V, VIH = 5.25 V
V VCC = 4.75
II = –18 mA
Supply
Item
Supply Current
Symbol Min Typ
Max Unit Conditions
ICC
55 *3 80
mA VCC = 5.25 V
Notes: 1. Not more than one output should be shorted at a time, and duration of the short circuit should
not exceed one second.
2. In this table, only the threshold voltage is expressed in algebra.
3. All typical values are at V CC = 5 V, Ta = 25°C.
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HD29050www.DataSheet4U.com
1. tPLHD , tPHLD
Test circuit
Enable
3V
Input
Pulse
Generator
*1
A
Y
Z
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Output
CL =
30pF
*2
5V
RL =
180 Ω
RL =
75 Ω
HD29050
Waveforms
Input
A
Output
Y
Output
Z
1.3 V 1.3 V
tPLHD
1.3 V
tPHLD
3V
tPHLD0 V
VOH
1.3 V
tPLHD VOL
VOH
1.3 V 1.3 V
VOL
tSKD tSKD
2. tZHD , tZLD , tHZD , tLZD
Test circuit
Input
Pulse
Generator
*1
Enable
A
3 V or GND
5V
Output RL =
180 Ω
Y
Z CL = 30pF *3
or 10pF
*2
RL =
75 Ω
Input
Enable
Output
Waveforms
1.3 V 1.3 V
tZHD tHZD
1.3 V
tZLD
1.3 V
3V
0V
0.5 VVOH
tLZD
VOL
VOH
0.5 VVOL
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