DS55107/DS75107/DS75108/DS75208 Dual Line Receivers General Description The products described herein are TTL compatible dual high speed circuits intended for sensing in a broad range of system applications. While the primary usage will be for line receivers of MOS sensing, any of the products may effectively be used as voltage comparators, level translators, window detectors, transducer preamplifiers, and in other sensing applications. As digital line receivers the products are applicable with the SN55109/SN75109 and mA75110/ DS75110 companion drivers, or may be used in other balanced or unbalanced party-line data transmission systems. The improved input sensitivity and delay specifications of the DS75208 make it ideal for sensing high performance MOS memories as well as high sensitivity line receivers and voltage comparators. Input protection diodes are incorporated in series with the collectors of the differential input stage. These diodes are useful in certain applications that have multiple VCC a supplies or VCC a supplies that are turned off. Features Y Y Y Y Y Y Y Y Y Y Y Diode protected input stage for power ‘‘OFF’’ condition 17 ns typ high speed TTL compatible g 10 mV or g 25 mV input sensitivity g 3V input common-mode range High input impedance with normal VCC, or VCC e 0V Strobes for channel selection Dual circuits Sensitivity gntd. over full common-mode range Logic input clamp diodesÐmeets both ‘‘A’’ and ‘‘B’’ version specifications g 5V standard supply voltages Connection Diagram Dual-In-Line Package TL/F/9446 – 1 Top View Order Number DS75107M, DS75107N, DS75107AM, DS75107AN, DS75108M, DS75108N or DS75208N See NS Package Number M14A or N14A For Complete Military 883 Specifications, see RETS Datasheet. Order Number DS55107AJ/883 See NS Package Number J14A Selection Guide Temperature x Package x b 55§ C s TA s a 125§ C Cavity Dip 0§ C s TA s a 70§ C Cavity or Molded Dip Input Sensitivity x Output Logicv g 25 mV g 25 mV g 10 mV TTL Active Pull-Up TTL Open Collector DS55107 DS75107 DS75108 DS75208 C1996 National Semiconductor Corporation TL/F/9446 RRD-B30M36/Printed in U. S. A. http://www.national.com DS55107/DS75107/DS75108/DS75208 Dual Line Receivers January 1996 Absolute Maximum Ratings (Note 1) Strobe Input Voltage If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage, VCC a Supply Voltage, VCC Differential Input Voltage Common Mode Input Voltage b 65§ C to a 150§ C Maximum Power Dissipation* at 25§ C Cavity Package Molded Package Lead Temperature (Soldering, 4 sec) 7V b 7V g 6V g 5V b 5.5V Storage Temperature Range 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. Operating Conditions DS75107, DS75108, DS75208 DS55107 Min Nom Max Min Nom Max 4.5V 5V 5.5V 4.75V 5V 5.25V Supply Voltage VCCb b 4.5V b 5V b 5.5V b 4.75V b 5V b 5.25V Operating Temperature Range b 55§ C to a 125§ C 0§ C to a 70§ C Supply Voltage VCC a 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 DS55107 and across the 0§ C to a 70§ C range for the DS75107, DS75108 and DS75208. 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. DS55107/DS75107, DS75108 Electrical Characteristics TMIN s TA s TMAX (Notes 2, 3) Symbol IIH Parameter Conditions High Level Input Current into A1, B1, A2 or B2 VCC a e Max, VCCb e Max, VID e 0.5V, VIC e b3V to 3V IIL Low Level Input Current into A1, B1, A2 or B2 IIH High Level Input Current into G1 or G2 VCC a e Max, VCCb e Max, VID e b2V, VIC e b3V to 3V VCC a e Max, VCCb e Max IIL Low Level Input Current into G1 or G2 VCC a e Max, VCCb e Max, VIL(S) e 0.4V IIH High Level Input Current into S VCC a e Max, VCCb e Max IIL VOH VOL Min Max Units 30 75 mA b 10 mA VIH(S) e 2.4V 40 mA VIH(S) Max VCC a 1 mA b 1.6 mA VIH(S) e 2.4V 80 mA VIH(S) e Max VCC a 2 mA b 3.2 mA Low Level Input Current into S VCC a e Max, VCCb e Max, VIL(S) e 0.4V High Level Output Voltage VCC a e Min, VCCb e Min, ILOAD e b400 mA, VID e 25 mV, VIC e b3V to 3V, (Note 3) Low Level Output Voltage Typ 2.4 V VCC a e Min, VCCb e Min, ISINK e 16 mA, VID e b25 mV, VIC e b3V to 3V 0.4 V 250 mA b 70 mA IOH High Level Output Current VCC a e Min, VCCb e Min VOH e Max VCC a , (Note 4) IOS Short Circuit Output Current VCC a e Max, VCCb e Max, (Notes 2 and 3) ICCH a High Logic Level Supply Current from VCC VCC a e Max, VCCb e Max, VID e 25 mV, TA e 25§ C 18 30 mA ICCHb High Logic Level Supply Current from VCC VCC a e Max, VCCb e Max, VID e 25 mV, TA e 25§ C b 8.4 b 15 mA Input Clamp Voltage on G or S VCC a e Min, VCCb e Min, IIN e b12 mA, TA e 25§ C b1 b 1.5 V VI http://www.national.com 2 b 18 Switching Characteristics VCC a e 5V, VCCb e b5V, TA e 25§ C Symbol Parameter Typ Max Units tPLH(D) Propagation Delay Time, Low to High Level, from Differential Inputs A and B to Output RL e 390X, CL e 50 pF, (Note 1) (Note 3) 17 25 ns (Note 4) 19 25 ns Propagation Delay Time, High to Low Level, from Differential Inputs A and B to Output RL e 390X, CL e 50 pF, (Note 1) (Note 3) 17 25 ns (Note 4) 19 25 ns Propagation Delay Time, Low to High Level, from Strobe Input G or S to Output RL e 390X, CL e 50 pF (Note 3) 10 15 ns (Note 4) 13 20 ns Propagation Delay Time, High to Low Level, from Strobe Input G or S to Output RL e 390X, CL e 50 pF (Note 3) 8 15 ns (Note 4) 13 20 ns Typ Max Units 30 75 mA b 10 mA tPHL(D) tPLH(S) tPHL(S) Conditions Min Note 1: Differential input is a 100 mV to b 100 mV pulse. Delays read from 0 mV on input to 1.5V on output. Note 2: Only one output at a time should be shorted. Note 3: DS55107/DS75107 only. Note 4: DS75108 only. DS75208 Electrical Characteristics 0§ C s TA s a 70§ C Symbol Parameter Conditions IIH High Level Input Current into A1, B1, A2 or B2 VCC a e Max, VCCb e Max, VID e 0.5V, VIC e b3V to 3V IIL Low Level Input Current into A1, B1, A2 or B2 VCC a e Max, VCCb e Max, VID e b2V, VIC e b3V to 3V IIH High Level Input Current into G1 or G2 VCC a e Max, VCCb e Max IIL Low Level Input Current into G1 or G2 VCC a e Max, VCCb e Max, VIL(S) e 0.4V IIH High Level Input Current into S VCC a e Max, VCCb e Max IIL Low Level Input Current into S VCC a e Max, VCCb e Max, VIL(S) e 0.4V VOL Low Level Output Voltage Min VIH(S) e 2.4V 40 mA VIH(S) e Max VCC a 1 mA b 1.6 mA VIH(S) e 2.4V 80 mA VIH(S) e Max VCC a 2 mA b 3.2 mA VCC a e Min, VCCb e Min, ISINK e 16 mA, VID e b10 mV, VIC e b3V to 3V 0.4 V 250 mA IOH High Level Output Current VCC a e Min, VCCb e Min, VOH e Max VCC a ICCH a High Logic Level Supply Current from VCC a VCC a e Max, VCCb e Max, VID e 10 mV, TA e 25§ C 18 30 mA ICCHb High Logic Level Supply Current from VCCb VCC a e Max, VCCb e Max, VID e 10 mV, TA e 25§ C b 8.4 b 15 mA VI Input Clamp Voltage on G or S VCC a e Min, VCCb e Min, IIN e b12 mA, TA e 25§ C b1 b 1.5 V 3 http://www.national.com Switching Characteristics VCC a e 5V, VCCb e b5V, TA e 25§ C Symbol Parameter Conditions tPLH(D) Propagation Delay Time, Low-toHigh Level, from Differential Inputs A and B to Output RL e 470X, CL e 15 pF, (Note 1) Propagation Delay Time, High-toLow Level, from Differential Inputs A and B to Output RL e 470X, CL e 15 pF, (Note 1) Propagation Delay Time, Low-toHigh Level, from Strobe Input G or S to Output RL e 470X, CL e 15 pF Propagation Delay Time, High-toLow Level, from Strobe Input G or S to Output RL e 470X, CL e 15 pF tPHL(D) tPLH(S) tPHL(S) Min Typ Max Units 35 ns 20 ns 17 ns 17 ns Note 1: Differential input is a 10 mV to b 30 mV pulse. Delays read from 0 mV on input to 1.5V on output. Voltage Waveforms TL/F/9446 – 12 Typical Applications Basic Balanced-Line Transmission System TL/F/9446 – 2 http://www.national.com 4 Typical Applications (Continued) Data-Bus or Party-Line System TL/F/9446 – 3 25 mV (or less). For normal line resistances, data may be recovered from lines of several thousand feet in length. Line termination resistors (RT) are required only at the extreme ends of the line. For short lines, termination resistors at the receiver only may prove adequate. The signal amplitude will then be approximately: VDIFF j IO(on) c RT (2) APPLICATION The DS55107, DS75107 dual line circuits are designed specifically for use in high speed data transmission systems that utilize balanced, terminated transmission lines such as twisted-pair lines. The system operates in the balanced mode, so that noise induced on one line is also induced on the other. The noise appears common mode at the receiver input terminals where it is rejected. The ground connection between the line driver and receiver is not part of the signal circuit so that system performance is not affected by circulating ground currents. The unique driver output circuit allows terminated transmission lines to be driven at normal line impedances. High speed system operation is ensured since line reflections are virtually eliminated when terminated lines are used. Crosstalk is minimized by low signal amplitudes and low line impedances. The typical data delay in a system is approximately (30 a 1.3L) ns, where L is the distance in feet separating the driver and receiver. This delay includes one gate delay in both the driver and receiver. Data is impressed on the balanced-line system by unbalancing the line voltages with the driver output current. The driven line is selected by appropriate driver input logic levels. The voltage difference is approximately: VDIFF j (/2 IO(on) c RT (1) The strobe feature of the receivers and the inhibit feature of the drivers allow the DS55107, DS75107 dual line circuits to be used in data-bus or party-line systems. In these applications, several drivers and receivers may share a common transmission line. An enabled driver transmits data to all enabled receivers on the line while other drivers and receivers are disabled. Data is thus time multiplexed on the transmission line. The DS55107, DS75107 device specifications allow widely varying thermal and electrical environments at the various driver and receiver locations. The data-bus system offers maximum performance at minimum cost. The DS55107, DS75107 dual line circuits may also be used in unbalanced or single line systems. Although these systems do not offer the same performance as balanced systems for long lines, they are adequate for very short lines where environment noise is not severe. The receiver threshold level is established by applying a DC reference voltage to one receiver input terminal. The signal from the transmission line is applied to the remaining input. The reference voltage should be optimized so that signal High series line resistance will cause degradation of the signal. The receivers, however, will detect signals as low as 5 http://www.national.com Typical Applications (Continued) swing is symmetrical about it for maximum noise margin. The reference voltage should be in the range of b3.0V to a 3.0V. It can be provided by a voltage supply or by a voltage divider from an available supply voltage. DS75108 Wired-OR Output Connections Unbalanced or Single-Line Systems TL/F/9446–4 TL/F/9446 – 6 Precautions in the Use of DS1603, DS3603, DS55107, DS75107, DS75108 and DS75208 Dual Line Receivers The following precaution should be observed when using or testing DS55107, DS75107 line circuits. When only one receiver in a package is being used, at least one of the differential inputs of the unused receiver should be terminated at some voltage between b3.0V and a 3.0V, preferably at ground. Failure to do so will cause improper operation of the unit being used because of common bias circuitry for the current sources of the two receivers. The DS55107, DS75107 and DS75108 line receivers feature a common mode input voltage range of g 3.0V. This satisfies the requirements for all but the noisiest system applications. For these severe noise environments, the common mode range can be extended by the use of external input attenuators. Common mode input voltages can in this way be reduced to g 3.0V at the receiver input terminals. Differential data signals will be reduced proportionately. Input sensitivity, input impedance and delay times will be adversely affected. The DS75108 line receivers feature an open-collector-output circuit that can be connected in the DOT-OR logic configuration with other DS75108 outputs. This allows a level of logic to be implemented without addtional logic delay. Circuit Differences Between ‘‘A’’ and Standard Devices The difference between the ‘‘A’’ and standard devices is shown in the following schematics of the input stage. ‘‘A’’ Devices TL/F/9446 – 7 Increasing Common Mode Input Voltage Range of Receiver Standard Devices TL/F/9446–5 TL/F/9446 – 8 http://www.national.com 6 Typical Applications (Continued) This would be a problem in specific systems which might possibly have the transmission lines biased to some potential greater than 1.4V. Since this is not a widespread application problem, both the ‘‘A’’ and standard devices will be available. The ratings and characteristic specifications of the ‘‘A’’ devices are the same as those of the standard devices. The DS55107A feature the ‘‘A’’ device input stage. The input protection diodes are useful in certain party-line systems which may have multiple V a power supplies and, in which case, may be operated with some of the V a supplies turned off. In such a system, if a supply is turned off and allowed to go to ground, the equivalent input circuit connected to that supply would be as follows: ‘‘A’’ Devices TL/F/9446 – 9 Standard Devices TL/F/9446 – 10 Schematic Diagrams DS55107/DS75107, DS75108, DS75208 TL/F/9446 – 11 Note 1: (/2 of the dual circuit is shown. Note 2: *Indicates connections common to second half of dual circuit. Note 3: Components shown with dash lines are applicable to the DS55107, DS75207 and DS75107 only. 7 http://www.national.com http://www.national.com 8 Physical Dimensions inches (millimeters) Ceramic Dual-In-Line Package (J) Order Number DS55107J, DS75107J or DS75208J NS Package Number J14A Molded Dual-In-Line Package (M) Order Number DS75107M, DS75107AM or DS75108M NS Package Number M14A 9 http://www.national.com DS55107/DS75107/DS75108/DS75208 Dual Line Receivers Physical Dimensions inches (millimeters) (Continued) Molded Dual-In-Line Package (N) Order Number DS75107N, DS75107AN, DS75108N or DS75208N 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. 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