DS8921

DS8921/DS8921A/DS8921AT Differential Line Driver and Receiver Pair May 1998 DS8921/DS8921A/DS8921AT Differential Line Driver and Receiver Pair General 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 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 wire transmission lines. Complementary 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 compatible 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 Complementary Driver Outputs High differential or common-mode input voltage ranges of ± 7V n ± 0.2V receiver sensitivity over the input voltage range n Receiver input hysteresis-70 mV 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 ≥ VT...