DS7640/DS8640 Quad NOR Unified Bus Receiver General Description Features 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. 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 DS7640/DS8640 Quad NOR Unified Bus Receiver February 1996 Absolute Maximum Ratings Operating Conditions (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage Input Voltage Storage Temperature Range Supply Voltage (VCC) DS7640 DS8640 Temperature (TA) DS7640 DS8640 7.0V 5.5V b 65§ C to a 150§ C Maximum Power Dissipation* at 25§ C Cavity Package Molded Package Lead Temperature (Soldering, 4 seconds) Min Max Units 4.5 4.75 5.5 5.25 V V b 55 a 125 a 70 §C §C 0 1308 mW 1207 mW 260§ C *Derate cavity package 8.7 mW/§ C above 25§ C; derate molded package 9.7 mW/§ C above 25§ C. Electrical Characteristics The following apply for VMIN s VCC s VMAX, TMIN s TA s TMAX, unless otherwise specified (Notes 2 and 3) Symbol VIH VIL IIH Parameter Conditions VOUT e VOL High Level Input Threshold Low Level Input Threshold VOUT e VOH VIN e 4V Maximum Input Current Min Typ DS7640 1.80 1.50 DS8640 1.70 1.50 Max Units V V DS7640 1.50 1.20 V DS8640 1.50 1.30 V VCC e VMAX 30 80 mA VCC e 0V 1.0 50 mA 1.0 50 mA IIL Maximum Input Current VIN e 0.4V, VCC e VMAX VOH Output Voltage IOH e b400 mA, VIN e VIL VOL Output Voltage IOL e 16 mA, VIN e VIH IOS Output Short Circuit Current VIN e 0.5V, VOS e 0V, VCC e VMAX, (Note 4) ICC Power Supply Current VIN e 4V, (Per Package) 2.4 V 0.25 b 18 0.4 V b 55 mA 40 mA 25 Switching Characteristics TA e 25§ C, nominal power supplies unless otherwise noted Symbol tpd Parameter Propagation Delays Conditions (Notes 5 and 6) Min Typ Max Units Input to Logic ‘‘1’’ Output 10 23 35 ns Input to Logic ‘‘0’’ Output 10 15 30 ns Note 1: ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed. Except for ‘‘Operating Temperature Range’’ they are not meant to imply that the devices should be operated at these limits. The table of ‘‘Electrical Characteristics’’ provides conditions for actual device operation. Note 2: Unless otherwise specified min/max limits apply across the b 55§ C to a 125§ C temperature range for the DS7640 and across the 0§ C to a 70§ C range for the DS8640. All typical values are TA e 25§ C and VCC e 5V. Note 3: All currents into device pins shown as positive, out of device pins as negative, all voltages referenced to ground unless otherwise noted. All values shown as max or min on absolute value basis. Note 4: Only one output at a time should be shorted. Note 5: Fan-out of 10 load, CLOAD e 15 pF total, measured from VIN e 1.5V to VOUT e 1.5V, VIN e 0V to 3V pulse. Note 6: Apply to VCC e 5V, TA e 25§ C. http://www.national.com 2 Physical Dimensions inches (millimeters) Ceramic Dual-In-Line Package (J) Order Number DS7640J NS Package Number J14A 3 http://www.national.com DS7640/DS8640 Quad NOR Unified Bus Receiver Physical Dimensions inches (millimeters) (Continued) Molded Dual-In-Line Package (N) Order Number DS8640N NS Package Number N14A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 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