DS8921AT Datasheet

RS-422 Interface IC


The DS8921, DS8921AT are Differential Line Driver and Receiver pairs designed specifically for applicationsmeeting the ST506, ST412 and ESDI Disk Drive Standards. In addition, these devices meet the requirements ofthe EIA Standard RS-422.The DS8921, DS8921A receivers offer an input sensitivity of 200 mV over a ±7V common mode operating range.Hysteresis is incorporated (typically 70 mV) to improve noise margin for slowly changing input waveforms.The DS8921, DS8921A drivers are designed to provide unipolar differential drive to twisted pair or parallel wiretransmission lines. Complementary outputs are logically ANDed and provide an output skew of 0.5 ns (typ.) withpropagation delays of 12 ns.The DS8921, DS8921A are designed to be compatible with TTL and CMOS. DS8921AT Features • 12 ns typical propagation delay• Output skew - 0.5 ns typical• Meet the requirements of EIA Standard RS-422• Complementary Driver Outputs• High differential or common-mode inputvoltage ranges of ±7V• ±0.2V receiver sensitivity over the inputvoltage range• Receiver input hysteresis-70 mV typical• DS8921AT industrial temperature operation:(−40°C to +85°C)


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Manufacturer information


Diodes Incorporated is a leading global manufacturer and supplier of high-quality application specific standard products within the broad discrete, logic, analog and mixed-signal semiconductor markets. Diodes serves the consumer electronics, computing, communications, industrial, and automotive markets.
Diodes’ products include diodes, rectifiers, transistors, MOSFETs, protection devices, function-specific arrays, single gate logic, amplifiers and comparators, Hall-effect and temperature sensors, power management devices, including LED drivers, AC-DC converters and controllers, DC-DC switching and linear voltage regulators, and voltage references along with special function devices, such as USB power switches, load switches, voltage supervisors, and motor controllers.
Diodes’ corporate headquarters and Americas’ sales office are located in Plano, Texas and Milpitas, California. Design, marketing, and engineering centers are located in Plano; Milpitas; Taipei, Taiwan; Taoyuan City, Taiwan; Zhubei City, Taiwan; Manchester, England; and Neuhaus, Germany. Diodes’ wafer fabrication facilities are located in Manchester and Shanghai, China. Diodes has assembly and test facilities located in Shanghai, Jinan, Chengdu, and Yangzhou, China, as well as in Hong Kong, Neuhaus and Taipei. Additional engineering, sales, warehouse, and logistics offices are located in Taipei; Hong Kong; Manchester; Shanghai; Shenzhen, China; Seongnam-si, South Korea; and Munich, Germany, with support offices throughout the world.

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