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| DS7837 DS8837 Hex Unified Bus Receiver February 1996 DS7837 DS8837 Hex Unified Bus Receiver General Description The DS7837 DS8837 are high speed 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 receiver design employs a built-in input hysteresis providing substantial noise immunity Low input current allows up to 27 driver receiver pairs to utilize a common bus Disable inputs provide time discrimination Disable inputs and receiver outputs are TTL compatible Performance is optimized for systems with bus rise and fall times s 1 0 ms V Features Y Y Y Y Y Y Y Y Low receiver input current for normal VCC or VCC e 0V (15 mA typ) Six separate receivers per package Built-in receiver input hysteresis (1V typ) High receiver noise immunity (2V typ) Temperature insensitive receiver input thresholds track bus logic levels TTL compatible disable and output Molded or cavity dual-in-line or flat package High speed Typical Application TL F 5811 - 1 Connection Diagram Dual-In-Line Package TL F 5811 - 2 Top View Order Number DS7837J DS8837M or DS8837N See NS Package Number J16A M16A or N16A C1996 National Semiconductor Corporation TL F 5811 RRD-B30M36 Printed in U S A http www national com 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 Input Voltage Operating Temperature Range DS7837 DS8837 7V 5 5V b 55 C to a 125 C 0 C to a 70 C Operating Conditions Min Supply Voltage (VCC) DS7837 DS8837 Temperature (TA) DS7837 DS8837 45 4 75 b 55 Max 55 5 25 a 125 a 70 Units V V C C 0 b 65 C to a 150 C Storage Temperature Range Maximum Power Dissipation at 25 C Cavity Package 1433 mW Molded DIP Package 1362 mW SO Package 1002 mW Lead Temperature (Soldering 4 seconds) 260 C Derate cavity package 9 6 mW C above 25 C derate molded DIP package 10 9 mW C above 25 C derate SO package 8 01 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 VTH Parameter High Level Receiver Threshold VCC e Max Conditions DS7837 DS8837 VTL Low Level Receiver Threshold VCC e Min DS7837 DS8837 IIH Maximum Receiver Input Current VIN e 4V VCC e VMAX VCC e 0V IIL VIH VIL IIH Logical ``0'' Receiver Input Current Logical ``1'' Input Voltage Logical ``0'' Input Voltage Logical ``1'' Input Current Disable Input VIN e 0 4V VCC e VMAX Disable Disable VIND e 2 4V VIND e 5 5V IIL VOH VOL IOS ICC VCL Logical ``0'' Input Current Logical ``1'' Output Voltage Logical ``0'' Output Voltage Output Short Circuit Current Power Supply Current Input Clamp Diode VIN e 4V VIND e 0 4V Disable Input VIN e 0 5V VIND e 0 8V IOH e b400 mA VIN e 4V VIND e 0 8V IOH e 16 mA VIN e 0 5V VIND e 0V VOS e 0V VCC e VMAX (Note 4) VIN e 4V VIND e 0V (Per Package) VIN e b12 mA VIND e b12 mA TA e 25 C b 18 0 Min 1 65 1 80 0 97 1 05 Typ 2 25 2 25 1 30 1 30 15 0 10 10 Max 2 65 2 50 1 63 1 55 50 0 50 0 50 0 Units V V V V mA mA mA V 20 08 80 0 20 b3 2 V mA mA mA V 24 0 25 04 b 55 0 V mA mA V 45 0 b1 0 60 0 b1 5 http www national com 2 Switching Characteristics TA e 25 C Symbol tpd Parameter Propagation Delays VIND e 0V Receiver Input e 0V Disable (Note 7) nominal power supplies unless otherwise noted Conditions Input to Logical ``1'' Output (Note 5) Input to Logical ``0'' Output (Note 6) Input to Logical ``1'' Output Input to Logical ``0'' Output Min Typ 20 18 9 4 Max 30 30 15 10 Units ns ns ns 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 DS7837 and across the 0 C to a 70 C range for the DS8837 All typical values are for 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 3V to VOUT e 1 5V VIN e 0V to 3V pulse Note 6 Fan-out of 10 load CLOAD e 15 pF total Measured from VIN e 2 3V to VOUT e 1 5V VIN e 0V to 3V pulse Note 7 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 Physical Dimensions inches (millimeters) Ceramic Dual-In-Line Package (J) Order Number DS7837J NS Package Number J16A 3 http www national com DS7837 DS8837 Hex Unified Bus Receiver Physical Dimensions inches (millimeters) (Continued) SO Package (M) Order Number DS8837M NS Package Number M16A Molded Dual-In-Line Package (N) Order Number DS8837N NS Package Number N16A 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 National Semiconductor Corporation 1111 West Bardin Road Arlington TX 76017 Tel 1(800) 272-9959 Fax 1(800) 737-7018 2 A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness http www national com National Semiconductor Europe Fax a49 (0) 180-530 85 86 Email europe support nsc com Deutsch Tel a49 (0) 180-530 85 85 English Tel a49 (0) 180-532 78 32 Fran ais Tel a49 (0) 180-532 93 58 Italiano Tel a49 (0) 180-534 16 80 National Semiconductor Hong Kong Ltd 13th Floor Straight Block Ocean Centre 5 Canton Rd Tsimshatsui Kowloon Hong Kong Tel (852) 2737-1600 Fax (852) 2736-9960 National Semiconductor Japan Ltd Tel 81-043-299-2308 Fax 81-043-299-2408 National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications |
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