DS7820/DS8820 Dual Line Receiver General Description Features The DS7820, specified from b55§ C to a 125§ C, and the DS8820, specified from 0§ C to a 70§ C, are digital line receivers with two completely independent units fabricated on a single silicon chip. Intended for use with digital systems connected by twisted pair lines, they have a differential input designed to reject large common mode signals while responding to small differential signals. The output is directly compatible with TTL or LS integrated circuits. The response time can be controlled with an external capacitor to eliminate noise spikes, and the output state is determined for open inputs. Termination resistors for the twisted pair line are also included in the circuit. Both the DS7820 and the DS8820 are specified, worst case, over their full operating temperature range, for g 10-percent supply voltage variations and over the entire input voltage range. Y Y Y Y Y Y Operation from a single a 5V logic supply Input voltage range of g 15V Each channel can be strobed independently High input resistance Fan out of two with TTL integrated circuits Strobe low forces output to ‘‘1’’ state Connection Diagram Dual-In-Line Package TL/F/5796 – 2 Top View Order Number DS7820J or DS8820N See NS Package Number J14A or N14A For Complete Military 883 Specifications, See RETS Data Sheet. Order Number: DS7820J/883 or DS7820W/883 See NS Package Number J14A or W14B C1996 National Semiconductor Corporation TL/F/5796 RRD-B30M36/Printed in U. S. A. http://www.national.com DS7820/DS8820 Dual Line Receiver February 1996 Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Maximum Power Dissipation* at 25§ C Cavity Package Molded Package Supply Voltage Input Voltage *Derate cavity package 8.7 mW/§ C above 25§ C; derate molded package 9.7 mW/§ C above 25§ C. 8.0V g 20V Differential Input Voltage Strobe Voltage Output Sink Current Storage Temperature Range Lead Temperature (Soldering, 4 sec.) g 20V 1308 mW 1207 mW Operating Conditions 8.0V 25 mA b 65§ C to a 150§ C 260§ C Supply Voltage (VCC) DS7820 DS8820 Temperature (TA) DS7820 DS8820 Min Max Units 4.5 4.75 5.5 5.25 V V b 55 0 a 125 a 70 §C §C Electrical Characteristics (Notes 2 and 3) Symbol VTH Parameter Input Threshold Voltage Conditions Min Typ Max Units VCM e 0V b 0.5 0 0.5 V b 15V s VCM s 15V b 1.0 0 1.0 V VOH High Output Level IOUT s 0.2 mA 2.5 5.5 V VOL Low Output Level ISINK s 3.5 mA 0 0.4 V RIb Inverting Input Resistance 3.6 5.0 RI a Non-Inverting Input Resistance 1.8 2.5 RT Line Termination Resistance TA e 25§ C 120 170 tr Response Time CDELAY e 0 pF IST Strobe Current ICC Power Supply Current IIN b Non-Inverting Input Current Inverting Input Current kX 250 40 CDELAY e 100 pF 150 VSTROBE e 0.4V b 1.0 VSTROBE e 5.5V IIN a kX X ns ns b 1.4 mA 5.0 mA VIN e 15V 3.2 6.0 mA VIN e 0V 5.8 10.2 mA VIN e b15V 8.3 15.0 mA VIN e 15V 5.0 7.0 mA VIN e 0V b 1.6 b 1.0 mA VIN e b15V b 9.8 b 7.0 mA VIN e 15V 3.0 4.2 mA VIN e 0V 0 b 0.5 mA VIN e b15V b 4.2 b 3.0 mA 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: These specifications apply for 4.5V s VCC s 5.5V, b 15V s VCM s 15V and b 55§ C s TA s a 125§ C for the DS7820 or 0§ C s TA s a 70§ C for the DS8820 unless otherwise specified; typical values given are for VCC e 5.0V, TA e 25§ C and VCM e 0 unless stated differently. 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: The specifications and curves given are for one side only. Therefore, the total package dissipation and supply currents will be double the values given when both receivers are operated under identical conditions. http://www.national.com 2 Typical Performance Characteristics (Note 3) Supply Voltage Sensitivity Common Mode Rejection Transfer Function TL/F/5796 – 4 Response Time Output Voltage Levels Termination Resistance TL/F/5796 – 5 Positive Supply Current Internal Power Dissipation TL/F/5796 – 6 3 http://www.national.com Typical Application TL/F/5796 – 3 Schematic Diagram TL/F/5796 – 1 http://www.national.com 4 Physical Dimensions inches (millimeters) Ceramic Dual-In-Line Package (J) Order Number DS7820J NS Package Number J14A 5 http://www.national.com DS7820/DS8820 Dual Line Receiver Physical Dimensions inches (millimeters) (Continued) Molded Dual-In-Line Package (N) Order Number DS8820N 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. National Semiconductor Corporation 1111 West Bardin Road Arlington, TX 76017 Tel: 1(800) 272-9959 Fax: 1(800) 737-7018 http://www.national.com 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. 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 Fran3ais 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. This datasheet has been download from: www.datasheetcatalog.com Datasheets for electronics components.