ic-we iC-Haus, ic-we Datasheet - Page 2

• Manufacturer Part Number: ic-we
• Description: 3-channel 75 ? Line Driver
• Manufacturer: iC-Haus

iC-WE
3-CHANNEL 75 Ω LINE DRIVER
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
PIN FUNCTIONS
Name
VCC
E1
E2
E3
TRI
INV
TNER
To enhance heat removal, the TSSOP20 package offers a large area pad to be soldered (a connection is
only permitted to GND).
Function
+5 V (± 10 %) Input Supply Voltage
Channel 1 Input
Channel 2 Input
Channel 3 Input
Tristate Input, high active
Invert Mode Input, high active
Error Input
SO20
(low power applications only)
SO16W
Name
VB
A1
A2
A3
NER
GND
Function
+4.5..+30 V Driver Supply Voltage
Channel 1 Output
Channel 2 Output
Channel 3 Output
Error Output, low active
Ground
TSSOP20tp 4.4 mm
(scale 2:1)
Rev D1, Page 2/10