DM8838

Line Drivers IReceivers DM7838/DM8838 quad unified"bus transceiver general description ~·features The DM7838/DM8838 are quad high speed drivers!' receivers designed for use in bus organized datatransmission systems interconnected by termi· nated 120n Impedance lines. The external termi· nation is intended to be a 180n resistor from the bus to the +5V logic supply together with a 390n resistor from the bus to ground. The bus can be terminated at one or both ends. Low bus pin cur· rent allows up to 27 driver/receiver pairs to utilize a common bus. The bus loading is unchanged when Vee = OV. The receivers Incorporate hystere· SIS to greatly enhance bus nOise immunity. One two·lnput NOR gate is included tq disable all drivers In a package simultaneously. Receiver per· formance IS optimized for systems with bus rISe and fall times::; 10}.1s. 4 totally separate driver/receiver pairs per package 1V typical receiver Input hysteresIs Receiver hysteresis independent of re...