DS8921 Datasheet | National Semiconductor

Description The DS8921, DS8921A are Differential Line Driver and Receiver pairs designed specifically for applications meeting the ST506, ST412 and ESDI Disk Drive Standards. In addition, these devices meet the requirements of the EIA Standard RS-422. The DS8921, DS8921A receivers offer an input sensitivity of 200 m V over a ± 7V mon mode operating range. Hysteresis is incorporated (typically 70 m V) 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 wire transmission lines. plementary outputs are logically ANDed and provide an output skew of 0.5 ns (typ.) with propagation delays of 12 ns. The DS8921, DS8921A are designed to be patible with TTL and CMOS. Features n n n n n 12 ns typical propagation delay Output skew - 0.5 ns typical Meet the requirements of EIA Standard RS-422 plementary Driver Outputs High differential or mon-mode input voltage ranges of ± 7V n ± 0.2V receiver sensitivity over the input voltage range n Receiver input hysteresis-70 m V typical n DS8921AT industrial temperature operation: (- 40˚C to +85˚C) Connection Diagram DS008512-1 Order Number DS8921M, DS8921N, DS8921AM, DS8921AN, DS8921ATM, or DS8921ATN See NS Package Number M08A or N08E Truth Table Receiver Input VID ≥ VTH (MAX) VID ≤ VTH (MIN) Open VOUT 1 0 1 Input 1 0 Driver VOUT 1 0 VOUT 0 1 © 1998 National Semiconductor Corporation DS008512 .national. Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage 7V Driver Input Voltage - 0.5V to +7V Output Voltage 5.5V Receiver Output Sink Current 50 m A ± 10V Receiver Input Voltage ± 12V Differential Input Voltage Maximum Package Power Dissipation @ +25˚C M Package 730 m W N Package 1160 m W Derate M Package 9.3 m W/˚C above +25˚C Derate N Package 5.8 m W/˚C above +25˚C Storage...