iC-HD2

QUAD DIFFERENTIAL LINE DRIVER

Rev A6, 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.

PACKAGING INFORMATION TSSOP20

PIN CONFIGURATION TSSOP20

1

I1

2

GND1

3

4

NO1

5

6

NO2

7

8

O2

9

10

I2

20

I4

19

18

O4

17

16

NEN

15

14

NO3

13

12

GND2

11

O1

NERR

nc

VREF

I3

O3

NO4

nc

VB

PIN FUNCTIONS

No. Name Function

1 I1

Input 1

2 GND1 Ground

3 O1

Driver Output 1

4 NO1

Inverted Driver Output 1

5 VREF Voltage Regulator Output +5 V (5 mA)

6 NO2

Inverted Driver Output 2

7 O2

Driver Output 2

8 nc

9 I2

Input 2

10 NERR Error Message Output (low active)

11 I3

Input 3

12 GND2 Ground

13 O3

Driver Output 3

14 NO3

Inverted Driver Output 3

15 NEN

Function Input

(low signal enables driver outputs)

16 NO4

Inverted Driver Output 4

17 O4

Driver Output 4

18 nc

19 I4

Input 4

20 VB

+4.5 to +35 V Supply Voltage

The pins GND1, GND2 must be connected to ground.