iC-HD2
QUAD DIFFERENTIAL LINE DRIVER
Rev A5, Page 2/8
DESCRIPTION
iC-HD is a robust line driver for industrial 5 V and 24 V
applications with four complementary output chan-
nels.
For signal lines with a characteristic impedance of
30 to 140
Ω
the integrated line adapter, optimized
to 75
Ω,
minimizes ringing effects which arise when
there is no line termination.
At a supply of 24 V the push-pull driver stages typi-
cally provide 200 mA to discharge the line and also
have a low saturation voltage (of typically 200 mV
with a 40 mA low-side load). The outputs are current
limited and short-circuit-proof, shutting down with ex-
cessive temperature.
For bus applications the driver stages can be
switched to high impedance by a high at input NEN.
The driver stage inputs have a Schmitt trigger char-
acteristic and are compatible with CMOS and TTL
levels.
The device recognizes undervoltage at voltage regu-
lator output VREF and thus indirectly also at supply
voltage VB. VREF acts as a 5 V voltage supply for
external loads of up to 5 mA.
Excessive temperature and undervoltage are sig-
naled as an error by a low signal at the short-circuit-
proof NERR output. For test purposes the tempera-
ture monitor can be deactivated by applying a voltage
of greater than 12 V to input NEN.
The iC-HD contains internal ESD protection circuitry.
PACKAGES TSSOP20
PIN CONFIGURATION TSSOP20
PIN FUNCTIONS
No. Name Function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
The pins GND1, GND2 must be connected to ground.
I1
GND1
O1
NO1
VREF
NO2
O2
nc
I2
NERR
I3
GND2
O3
NO3
NEN
NO4
O4
nc
I4
VB
Input 1
Ground
Driver Output 1
Inverted Driver Output 1
Voltage Regulator Output +5 V (5 mA)
Inverted Driver Output 2
Driver Output 2
Input 2
Error Message Output (low active)
Input 3
Ground
Driver Output 3
Inverted Driver Output 3
Function Input
(low signal enables driver outputs)
Inverted Driver Output 4
Driver Output 4
Input 4
+4.5 to +35 V Supply Voltage
1
I1
2
GND1
3
O1
4
NO1
5
VREF
6
NO2
7
O2
8
nc
9
I2
10
NERR
20
VB
19
I4
18
nc
17
O4
16
NO4
...yyww
HD2
Code...
15
NEN
14
NO3
13
O3
12
GND2
11
I3
ICHAUS [ IC-HAUS GMBH ]
