Datasheet

iC-WE
3-CHANNEL 75 Ω LINE DRIVER
Rev D1, Page 2/10
SO20 SO16W
(low power applications only)
TSSOP20tp 4.4 mm
DESCRIPTION
The iC-WE is a high-speed monolithic line driver circuit for three independent channels with built-in
characteristic impedance adaption for 75Ω lines. The push-pull outputs are designed for a high driver power
of typ. 300mA at 24V. They are current-limited and short-circuit protected by thermal shut-down at over-
temperature. Clamp diodes to VB and to GND protect the IC outputs against echoes of mismatched lines and
against damage due to ESD according to MIL-STD-883.
All inputs are Schmitt triggers and contain current sources from the 5V supply VCC which select a defined
High Level without external wiring. Clamp diodes to VCC and to GND furnish ESD protection.
Using the INVert input it is possible to switch all channels to inverting or non-inverting operation. This enables
a data transmission with balanced line activation using two iC-WE devices. For bus applications the final
stages can be forced to a high impedance state using the TRI-State input.
The circuit monitors supply voltages VB and VCC as well as the chip temperature and switches all final stages
to high impedance in the event of a fault. The NER output which is constructed as an open collector and is
also short-circuit proof reports the fault via the connected line. The error input TNER can be linked to message
outputs of other ICs and allows iC-WE to report a system fault message. If the supply voltage VCC cancels,
NER becomes highly resistive.
PACKAGES SO20, SO16W, TSSOP20 to JEDEC Standard
PIN CONFIGURATION, top view (scale 2:1)
PIN FUNCTIONS
Name Function
VCC +5 V (± 10 %) Input Supply Voltage
E1 Channel 1 Input
E2 Channel 2 Input
E3 Channel 3 Input
TRI Tristate Input, high active
INV Invert Mode Input, high active
TNER Error Input
Name Function
VB +4.5..+30 V Driver Supply Voltage
A1 Channel 1 Output
A2 Channel 2 Output
A3 Channel 3 Output
NER Error Output, low active
GND Ground
To enhance heat removal, the TSSOP20 package offers a large area pad to be soldered (a connection is
only permitted to GND).