HD29050
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.
Pin Arrangement
R1B
R1A
R1Y
1
2
3
16 V
CC
15 D1A
14 D1Y
13 D1Z
12 D
Enable
11 D2Z
10 D2Y
9
(Top View)
D2A
R
4
Enable
R2Y
5
6
7
8
Features
Driver
•
Built in current restriction when short circuit
•
Power up / down protection.
•
High output current
I
OH
= –40 mA
I
OL
= 40 mA
Receiver
•
Input hysteresis (Typ. 50 mV)
•
In phase input voltage
±200
mV of input
sensitivity in the range –7 to +12 V.
R2A
R2B
GND
Function Table
Drivers
Input A
L
H
X
Enable
H
H
L
Output Y
L
H
Z
Receivers
Differential Input A – B
V
ID
≥
0.2 V
–0.2 V < V
ID
< 0.2 V
V
ID
≤
–0.2 V
X
H
L
Z
X
?
:
:
:
:
:
High level
Low level
High impedance
Immaterial
Irrelevant
Enable
L
L
L
H
Output Y
H
?
L
Z
Output Z
H
L
Z
HD29050
Absolute Maximum Ratings
Item
Supply Voltage
*1
*3
*2
*3
HD29050
Symbol
V
CC
V
IN
V
ID
I
O
V
IE
V
IN
*4
*5
Ratings
7
±25
±25
50
5.5
5.5
–1.0 to 7.0
0 to 70
–65 to 150
Unit
V
V
V
mA
V
V
V
°C
°C
Input Voltage A , B
Output Current
Input Voltage
*3
Differential Input Voltage
Enable Input Voltage
*4
Output Applied Voltage
V
O
T
opr
T
stg
Operating Temperature Range
Storage Temperature Range
Notes: 1. All voltage values except for differential input voltage are with respect to network ground terminal.
2. Differential input voltage is measured at the noninverting input with respect to the
corresponding inverting input.
3. Only receiver
4. Only driver
5. Z state
6. 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.
Recommended Operating Conditions
Item
Supply Voltage
In Phase Input Voltage
Differential Input Voltage
Enable Input Voltage
Input Voltage
*2
*1
*1
Symbol
V
CC
V
IC
V
ID
V
IE
V
IN
T
opr
Min
4.75
–7.0
–6.0
0
0
0
Typ
5.0
Max
5.25
12
6.0
5.25
5.25
Unit
V
V
V
V
V
°C
Operating Temperature
Notes: 1. Only receiver
2. Only driver
25
70
2
HD29050
Electrical Characteristics (Ta = 0 to +70°C)
Driver
Item
Input Voltage
Symbol
V
IHD
V
ILD
Input Clamp Voltage
V
IKD
2.5
Min
2.0
0.8
–1.5
Typ
Max
Unit
V
V
V
V
CC
= 4.75 V
I
I
= –18 mA
V
CC
= 4.75 V
I
OH
= –20 mA
V
CC
= 4.75 V
I
OH
= –40 mA
V
CC
= 4.75 V
I
OL
= 20 mA
V
CC
= 4.75 V
I
OL
= 40 mA
Conditions
HD29050
Output Voltage
V
OHD
V
2.4
V
V
OLD
0.45
V
0.5
V
µA
µA
µA
µA
µA
µA
µA
V
V
Output Leak Current
I
OZD
–100
100
V
CC
= 5.25 V, V
O
= 0.5 V
Enable = 0.8 V
V
CC
= 5.25 V, V
O
= 2.7 V
Enable = 0.8 V
V
CC
= 0 V
V
O
= –0.25 V
V
CC
= 0 V
V
O
= 6.0 V
V
CC
= 5.25 V
V
I
= 5.25 V
V
CC
= 5.25 V
V
I
= 2.7 V
V
CC
= 5.25 V
V
I
= 0.4 V
–100
100
I
O(Off)
–100
100
Input Current
I
ID
100
I
IHD
20
I
IHD
∆
V
OC
V
OD
2
∆
V
OD
Short Circuit
Output Current
*1
–360
0.4
2.0
0.4
–30
–150
Differential Output
Voltage
V
mA
V
CC
= 5.25 V
V
O
= 0 V
I
OSD
3
HD29050
Electrical Characteristics (Ta = 0 to +70°C)
Receiver
Item
Differential Input
Threshold Voltage
*2
HD29050
Symbol
V
THR
Min
Typ
Max
0.2
Unit Conditions
V
V
O
≥
2.7 V
–7.0 V < V
IC
< 12 V
V
O
≤
0.45 V
–7.0 V < V
IC
< 12 V
V
IN
= 12 V
0 V
≤
V
CC
≤
5.25 V
–0.2
I
IBR
V
Input Current
1.0
–0.8
mA
mA V
IN
= –7 V
0 V
≤
V
CC
≤
5.25 V
V
V
CC
= 4.75 V, I
O
= –400
µA
V
ID
= 0.4 V, –7.0 V < V
ICM
< 12 V
V
CC
= 4.75 V, I
O
= 8.0 mA
V
ID
= –0.4 V, –7.0 V < V
ICM
< 2 V
V
CC
= 5.25 V, V
O
= 0.4 V
V
ID
= 3.0 V, Enable = 2.0 V
V
CC
= 5.25 V, V
O
= 2.4 V
V
ID
= –3.0 V, Enable = 2.0 V
V
CC
= 5.25 V, V
O
= 0 V
V
ID
= 3.0 V
Output Voltage
V
OHR
2.7
V
OLR
0.45
V
Output Leak Current
I
OZR
–100
100
µA
µA
mA
–100
*1
100
Short Circuit Output
Current
Input Voltage
I
OSR
V
IHE
V
ILE
–15
2.0
–85
V
0.8
–100
20
100
–1.5
V
µA
µA
µA
V
V
CC
= 5.25 V, V
IL
= 0.4 V
V
CC
= 5.25 V, V
IH
= 2.7 V
V
CC
= 5.25 V, V
IH
= 5.25 V
V
CC
= 4.75
I
I
= –18 mA
Input Current
I
ILE
I
IHE
I
IE
Input Clamp Voltage
V
IKE
Supply
Item
Supply Current
Symbol
I
CC
Min
Typ
55
*3
Max
80
Unit
mA
Conditions
V
CC
= 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.
4
HD29050
Switching Characteristics (Ta = 25°C, V
CC
= 5 V)
Driver
Item
Propagation Delay
Time
Symbol
t
PLHD
Min
Typ
Max
20
Unit
ns
ns
Conditions
HD29050
C
L
= 30 pF, R
L
= 75
Ω
to GND
R
L
= 180
Ω
to V
CC
C
L
= 30 pF, R
L
= 75
Ω
to GND
R
L
= 180
Ω
to V
CC
C
L
= 30 pF, R
L
= 75
Ω
to GND
R
L
= 180
Ω
to V
CC
C
L
= 30 pF
R
L
= 75
Ω
to GND
C
L
= 30 pF
R
L
= 180
Ω
to V
CC
C
L
= 10 pF
R
L
= 75
Ω
to GND
C
L
= 10 pF
t
PHLD
*1
20
4
Propagation Delay
Time Difference
Output Enable Time
t
SKD
ns
t
ZHD
t
ZLD
20
ns
35
20
ns
Output Disable Time
t
HZD
ns
t
LZD
25
ns
Receiver
Item
Propagation Delay
Time
Symbol
t
PLHR
Min
Typ
Max
40
Unit
ns
ns
Conditions
C
L
= 15 pF
t
PHLR
40
20
C
L
= 15 pF
Output Enable Time
t
ZHR
ns
C
L
= 15 pF
R
L
= 5 KΩ to GND
C
L
= 15 pF
R
L
= 2 KΩ to V
CC
C
L
= 15 pF, R
L
= 5 KΩ to GND
R
L
= 2 KΩ to V
CC
t
ZLR
t
HZR
25
ns
Output Disable Time
30
ns
t
LZR
30
ns
Note: 1. t
SKD
=
t
PLHD
–
t
PHLD
5
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