Datasheet

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iC-WE

3-CHANNEL 75 Ω LINE DRIVER

Rev D1, Page 1/10

SO20 TSSOP20

thermal pad

SO16W

FEATURES APPLICATIONS

Ë 3 current-limited and short-circuit-proof push-pull drivers

Ë Built-in adaption to 75 Ω characteristic impedance

Ë High driver current of 300 mA at 24 V typ.

Ë Low saturation voltage up to 30 mA load current

Ë Short switching times and high slew rates by npn circuitry

Ë Wide driver supply range VB = 4.5 V to 30 V

Ë Internal free-wheeling diodes to VB and GND

Ë Schmitt trigger inputs with integrated pull-up current sources

Ë Inputs compatible to TTL and CMOS

Ë Inverting and non-inverting driver mode

Ë Bus capability due to Tri-State switching

Ë Compatible to EIA standard RS-422

Ë Thermal shutdown with hysteresis

Ë Short-circuit-proof OC error output reports thermal shutdown

or undervoltage at VCC or VB

Ë Driver disabled in case of fault

Ë extended temperature range of up to 130 °C in

TSSOP20tp 4.4 mm package

Ë 24 V signal transfer

Ë Line driver in PLC environment

PACKAGES

BLOCK DIAGRAM

iC-WE

SO20

LOW VOLTAGE

T.SHUTDOWN

ERROR

CHAN 3

CHAN 2

CHAN 1

MODE

GND

4-7,14-17

A3 18

A2 13

A1 11

NER

VCC

TNER

TRI

INV9

E11

Summary of content (10 pages)

PAGE 1
iC-WE 3-CHANNEL 75 Ω LINE DRIVER Rev D1, Page 1/10 FEATURES Ë Ë Ë Ë Ë Ë Ë Ë Ë Ë Ë Ë Ë Ë Ë Ë APPLICATIONS 3 current-limited and short-circuit-proof push-pull drivers Built-in adaption to 75 Ω characteristic impedance High driver current of 300 mA at 24 V typ. Low saturation voltage up to 30 mA load current Short switching times and high slew rates by npn circuitry Wide driver supply range VB = 4.
PAGE 2
iC-WE 3-CHANNEL 75 Ω LINE DRIVER Rev D1, Page 2/10 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 overtemperature.
PAGE 3
iC-WE 3-CHANNEL 75 Ω LINE DRIVER Rev D1, Page 3/10 ABSOLUTE MAXIMUM RATINGS Values beyond which damage may occur; device operation is not guaranteed. Item Symbol Parameter Conditions Fig. Unit Min. Max. G001 VCC Supply Voltage 0 7 V G002 VB Driver Supply Voltage 0 32 V -800 800 mA -4 4 mA G003 I(A) Output Current in A1..3 G004 I(E) Input Current in E1..
PAGE 4
iC-WE 3-CHANNEL 75 Ω LINE DRIVER Rev D1, Page 4/10 ELECTRICAL CHARACTERISTICS Operating Conditions: VB = 4.5..30 V, VCC = 5 V ± 10 %, Tj = -40..125 °C, unless otherwise noted Item Symbol Parameter Conditions Tj °C Fig. Unit Min. Typ. Max. Total Device 001 VCC Permissible Supply Voltage Range 4.5 5.5 V 002 I(VCC) Supply Current in VCC 24 23 21 19 mA mA mA mA 003 VB Permissible Driver Supply Voltage Range 30 V 004 I(VB)lo Supply Current in VB A1..
PAGE 5
iC-WE 3-CHANNEL 75 Ω LINE DRIVER Rev D1, Page 5/10 ELECTRICAL CHARACTERISTICS Operating Conditions: VB = 4.5..30 V, VCC = 5 V ± 10 %, Tj = -40..125 °C, unless otherwise noted Item Symbol Parameter Conditions Tj °C Fig. Unit Min. Typ. Max. Inputs E1..3 (continued) 204 Ipu() Pull-Up Current V(E) = 0..VCC - 1 V 40 280 µA 205 Vc()hi Clamp Voltage hi Vc(E)hi = V(E) - VCC, I(E) = 4 mA 0.4 1.25 V 206 Vc()lo Clamp Voltage lo I(E) = -4 mA 207 tp(E-A) Propagation Delay E6 A -1.25 -0.
PAGE 6
iC-WE 3-CHANNEL 75 Ω LINE DRIVER Rev D1, Page 6/10 APPLICATIONS INFORMATION Line drivers for automation & control equipment connect digital signals with TTL or CMOS levels to 24 V systems via cables. Due to possible short-circuits, the drivers are current-limited and lock out in the event of overtemperature. 32 The maximum permissible signal frequency depends on the capacitive load of the outputs (cable length) or the 28 consequential power dissipation in the iC-WE.
PAGE 7
iC-WE 3-CHANNEL 75 Ω LINE DRIVER Rev D1, Page 7/10 EXAMPLE 1: Balanced data transmission over twisted-pair cables For balanced data transmission two iC-WE devices can be operated in parallel at the inputs with different programming of the individual INVert input. The OC error outputs NER are linked for the system fault message. +5 V +24 V 2 ERROR TRI-STATE VCC 10 8 9 TNER MODE CMOS/TTL INPUTS ERROR 12 VB NER ERROR 3 TRI LOW VOLTAGE T.
PAGE 8
iC-WE 3-CHANNEL 75 Ω LINE DRIVER Rev D1, Page 8/10 The error input TNER on the iC-WE can be utilized to conduct a fault signal from the incremental encoder to the output NER and then to the receiver. For protection against voltage peaks from the cable, the state input TRI is wired to the RC combination R1, R2 and C5, which can be dimensioned for levels of up to 30 V at the PLC. Fig.
PAGE 9
iC-WE 3-CHANNEL 75 Ω LINE DRIVER Rev D1, Page 9/10 DEMO BOARD The device iC-WE with SO20 package is equipped with a Demo Board for test purposes. Figures 6 to 8 show the wiring as well as the top and bottom layout of the test PCB. CVB 1µF VB C02 1µF/40V IC2 MC7805C IN OUT GND CVCC 1µF VCC C01 1µF/16V D01 LED 2 VCC TNER TRI INV 10 8 9 TNER MODE E1 VB NER ERROR 3 D02 1N4148 NER TRI LOW VOLTAGE T.
PAGE 10
iC-WE 3-CHANNEL 75 Ω LINE DRIVER Rev D1, Page 10/10 ORDERING INFORMATION Type Package iC-WE SO20 iC-WE SO20 SO16W iC-WE SO16W TSSOP20tp 4.4 mm iC-WE TSSOP20 WE Demo Board Order designation WE DEMO For information about prices, terms of delivery, options for other case types, etc., please contact: iC-Haus GmbH Am Kuemmerling 18 D-55294 Bodenheim GERMANY Tel +49-6135-9292-0 Fax +49-6135-9292-192 http://www.ichaus.