DS7820A,DS8820A DS7820A/DS8820A Dual Line Receiver Literature Number: SNLS358A DS7820A/DS8820A Dual Line Receiver General Description The DS7820A and the DS8820A are improved performance 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 reject input noise spikes. The output state is a logic “1” for both inputs open. Termination resistors for the twisted pair line are also included in the circuit. Both the DS7820A and the DS8820A are specified, worst case, over their full operating temperature range (−55˚C to +125˚C and 0˚C to 70˚C respectively), over the entire input voltage range, for ± 10% supply voltage variations. Features n n n n n n n Operation from a single +5V logic supply Input voltage range of ± 15V Strobe low forces output to “1” state High input resistance Fanout of ten with TTL integrated circuits Outputs can be wire OR’ed Series 54/74 compatible Connection Diagram Dual-in-Line Package DS005797-2 Note 1: Pin 7 connected to bottom of cavity package. Top View Order Number DS7820AJ or DS8820AN See NS Package Number J14A or N14A For Complete Military 883 Specificatons, See RETS Data Sheet. Order Number DS7820AJ/883 See NS Package Number J14A or W14B © 2001 National Semiconductor Corporation DS005797 www.national.com DS7820A/DS8820A Dual Line Receiver May 1999 DS7820A/DS8820A Absolute Maximum Ratings (Note 3) Lead Temperature (Soldering, 4 sec.) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Operating Conditions Supply Voltage 8.0V ± 20V Common-Mode Voltage ± 20V Differential Input Voltage Strobe Voltage 8.0V Output Sink Current 50 mA Storage Temperature Range −65˚C to 150˚C Maximum Power Dissipation (Note 2) at 25˚C Cavity Package 1308 mW Molded Package 1207 mW Supply Voltage (VCC) DS7820A DS8820A Temperature (TA) DS7820A DS8820A 260˚C Min Max Units 4.5 4.75 5.5 5.25 V V −55 0 +125 +70 ˚C ˚C Note 2: Derate cavity package 8.7 mW/˚C above 25˚C; derate molded package 9.7 mW/˚C above 25˚C. Electrical Characteristics (Notes 4, 5, 6) Symbol VTH Parameter Differential Threshold Voltage Conditions Min Typ Max Units IOUT = −400 µA, −3V ≤ VCM ≤ +3V 0.06 0.5 V VOUT ≥ 2.5V −15V ≤ VCM ≤ +15V 0.06 1.0 V IOUT = +16 mA, −3V ≤ VCM ≤ +3V −0.08 −0.5 V VOUT ≤ 0.4V −15V ≤ VCM ≤ +15V −0.08 −1.0 V RI− Inverting Input Resistance −15V ≤ VCM ≤ +15V 3.6 5 RI+ Non-Inverting Input Resistance −15V ≤ VCM ≤ +15V 1.8 2.5 RT Line Termination Resistance TA = 25˚C 120 170 II− Inverting Input Current II+ ICC Non-Inverting Input Current Power Supply Current One Side Only kΩ kΩ 250 Ω VCM = 15V 3.0 4.2 mA VCM = 0V 0 −0.5 mA VCM = −15V −3.0 −4.2 mA VCM = 15V 5.0 7.0 mA VCM = 0V −1.0 −1.6 mA VCM = −15V −7.0 −9.8 mA VCM = 15V 3.9 6.0 mA VCM = −15V 9.2 14.0 mA IOUT = Logical “0” VDIFF = −1V VDIFF = −0.5V, VCM = 0V 6.5 10.2 mA VOH Logical “1” Output Voltage IOUT = −400 µA, VDIFF = 1V 2.5 4.0 5.5 V VOL Logical “0” Output Voltage IOUT = +16 mA, VDIFF = −1V 0 0.22 0.4 V VSH Logical “1” Strobe Input Voltage IOUT = +16 mA, VOUT ≤ 0.4V, VDIFF = −3V VSL Logical “0” Strobe Input Voltage IOUT = −400 µA, VOUT ≥ 2.5V, VDIFF = −3V 0.9 V 2.1 V ISH Logical “1” Strobe Input Current VSTROBE = 5.5V, VDIFF = 3V 0.01 5.0 µA ISL Logical “0” Strobe Input Current VSTROBE = 0.4V, VDIFF = −3V −1.0 −1.4 mA ISC Output Short Circuit Current VO = 0V, VCC = 5.5V, VSTROBE = 0V −4.5 −6.7 mA −2.8 Note 3: “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 4: These specifications apply for 4.5V ≤ VCC ≤ 5.5V, −15V ≤ VCM ≤ 15V and −55˚C ≤ TA ≤ +125˚C for the DS7820A or 4.75V ≤ VCC ≤ 5.25V, 0˚C ≤ TA ≤ +70˚C for the DS8820A unless otherwise specified. Typical values given are for VCC = 5.0V, TA = 25˚C and VCM = 0V unless stated differently. Note 5: 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 6: Only one output at a time should be shorted. www.national.com 2 Symbol Parameter tpd0 Propagation Delay, Differential Input to “0” Output tpd1 Propagation Delay, Differential Input to “1” Output tpd0 Propagation Delay, Strobe Input to “0” Output tpd1 Propagation Delay, Strobe Input to “1” Output Conditions Min Typ Max Units 30 45 ns 27 40 ns 16 25 ns 18 30 ns RL = 400 Ω, CL = 15 pF, see Figure 1 AC Test Circuit and Waveforms DS005797-7 Note 7: *Includes Jig and Probe Capacitance DS005797-8 A = Differential Input to “0” Output B = Differential Input to “1” Output C = Strobe Input to “0” Output D = Strobe Input to “1” Output FIGURE 1. 3 www.national.com DS7820A/DS8820A Switching Characteristics TA = 25˚C, VCC = 5V, unless otherwise noted DS7820A/DS8820A Typical Performance Characteristics Supply Voltage Sensitivity Common-Mode Voltage Sensitivity Temperature Sensitivity DS005797-6 DS005797-10 DS005797-9 Transfer Function Termination Resistance Input Characteristics DS005797-12 DS005797-11 Power Supply Current Internal Power Dissipation DS005797-14 Differential Input Delays Output Voltage Levels DS005797-15 Strobe Delays DS005797-16 Noise Rejection DS005797-17 www.national.com DS005797-13 DS005797-18 4 DS005797-19 DS7820A/DS8820A Schematic Diagram DS005797-1 Note 8: Schematic shows one-half of unit. Typical Applications Differential Line Driver and Receiver DS005797-3 Note 9: Optional to control response time. Single Ended (EIA-RS232C) Receiver with Hysteresis 5 www.national.com DS7820A/DS8820A Typical Applications (Continued) DS005797-5 (Output = “1” for Open Input) DS005797-4 www.national.com 6 DS7820A/DS8820A Physical Dimensions inches (millimeters) unless otherwise noted Ceramic Dual-In-Line Package (J) Order Number DS7820AJ or DS7820AJ/883 NS Package Number J14A 7 www.national.com DS7820A/DS8820A Dual Line Receiver Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Molded Dual-In-Line Package (N) Order Number DS8820AN 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 AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. 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