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| THREE CHANNEL DIFFERENTIAL LINE DRIVER IC With built-in current sink to drive an LED ET9600 FEATURES * * * * * * * * Supply Voltage Range 4.5V to 30V Operation to 800KHz CMOS and TTL Compatible Inputs Outputs RS-422A Compatible High Impedance Buffered Inputs with Hysteresis Outputs short circuit protected 70mA peak SINK/SOURCE current Outputs Protected by Thermal Shut-Down APPLICATIONS * * Optical Encoders Industrial Controls DESCRIPTION These line drivers are similar to the four channel 26ET31, with the added feature of providing an internal LED drive. The device is biased so that the base of the LED drive transistor (shown) is held at 2.5V. To set the LED current, connect a resistor from RSET to ground. For more information on LED drive, see application note APP-D2. Voltage connected to the VCC pin is regulated for use by logic functions within the chip, while the output drivers run off this voltage without modification. The device marking (see photo) includes the suffix SCP to denote that this version has `short circuit protection'. ABSOLUTE MAXIMUM RATINGS Parameter Operating Temperature Range Supply Voltage Range Symbol TA VCC Min. -40 4.5 Max. 125 30 Units C V Ref. Note 1 ETIC RESERVES THE RIGHT TO MAKE CHANGES AT ANY TIME TO IMPROVE THE DESIGN AND TO SUPPLY THE BEST PRODUCT. (c) 2000, Rev A1 iC-Haus GmbH Integrated Circuits Am Kuemmerling 18, D-55294 Bodenheim Page 1 of 2 Tel +49-6135-9292-0 Fax +49-6135-9292-192 http://www.ichaus.com ELECTRICAL CHARACTERISTICS Unless otherwise specified, typical values given at VCC=12V, TA = 25C, with LED and RSET open. Parameters Overtemp Operate Point (junction) Overtemp Release Point (junction) Supply Current Input Positive-Going Threshold G Input Negative-Going Threshold Low Level Input Current High Level Input Current Low Level Output High Level Output High Level Output Symbol TJOP TJRP Icc1 Icc2 VT+ VTIIL IIH VOL VOH VOH Min. Typ. 155 105 11.0 12.0 1.5 1.0 -0.1 0 150 2.9 28.4 Max. Units C C mA V V A A mV V V Test Conditions Note 1 Note 1 Vcc = 4.5 V Vcc = 30.0V 7.0 9.0 1.1 0.7 17.0 20.0 1.9 1.4 -4.0 4.0 375 2.4 27.8 VIN = 0V VIN = 5V VCC = 4.5V-30V IOL = 10mA IOH = -10mA,VCC = IOH = -10mA,VCC = 30V NOTES: 1. This is not a test parameter, but for information only. 2. It may be necessary to clamp the outputs with Schottky diodes when driving extemely long cables with high capacitance between outputs. These diodes should have a forward voltage of less than 0.4V, and be connected with cathode to the output and anode to ground. PACKAGE Chip Only 14 Lead SOIC SUFFIX -C -SOP ETIC RESERVES THE RIGHT TO MAKE CHANGES AT ANY TIME TO IMPROVE THE DESIGN AND TO SUPPLY THE BEST PRODUCT. (c) 2000, Rev A1 iC-Haus GmbH Integrated Circuits Am Kuemmerling 18, D-55294 Bodenheim Page 2 of 2 Tel +49-6135-9292-0 Fax +49-6135-9292-192 http://www.ichaus.com |
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