DS7640

DS7640 DS8640 Quad NOR Unified Bus Receiver February 1996 DS7640 DS8640 Quad NOR Unified Bus Receiver General Description The DS7640 and DS8640 are quad 2-input receivers designed for use in bus organized data transmission systems interconnected by terminated 120X impedance lines The external termination is intended to be 180X resistor from the bus to the a 5V logic supply together with a 390X resistor from the bus to ground The design employs a built-in input threshold providing substantial noise immunity Low input current allows up to 27 driver receiver pairs to utilize a common bus Features Y Y Y Y Y Y Low input current with normal VCC or VCC e 0V (30 mA typ) High noise immunity (1 1V typ) Temperature-insensitive input thresholds track bus logic levels TTL compatible output Matched optimized noise immunity for ‘‘1’’ and ‘‘0’’ levels High speed (19 ns typ) Connection Diagram Dual-In-Line Package TL F 5805 – 1 Top View Order Number DS7640J or DS8640N See NS Package Number J14A or N14A Typical Application 120X Unified Data Bus TL F 5805 – 2 C1996 National Semiconductor Corporation TL F 5805 RRD-B30M36 Printed in U S A http www national com Absolute Maximum Ratings (Note 1) Operating Conditions Min Supply Voltage (VCC) DS7640 DS8640 Temperature (TA) DS7640 DS8640 45 4 75 b 55 If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage Input Voltag...