DS75107 Dual Line Receiver General Description Features The product described herein is a TTL compatible dual high speed circuit intended for sensing in a broad range of system applications. While the primary usage will be for line receivers of MOS sensing, the product may effectively be used as a voltage comparator, level translator, window detector, transducer preamplifier, and in other sensing applications. As a digital line receiver the product is applicable with the SN55109/SN75109 and µA75110/DS75110 companion drivers, or may be used in other balanced or unbalanced party-line data transmission systems. 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+ supplies or VCC+ supplies that are turned off. n n n n n n n n n n Diode protected input stage for power “OFF” condition 17 ns typ high speed TTL compatible ± 10 mV or ± 25 mV input sensitivity ± 3V input common-mode range High input impedance with normal VCC, or VCC = 0V Strobes for channel selection Dual circuits Sensitivity gntd. over full common-mode range Logic input clamp diodes — meets both “A” and “B” version specifications n ± 5V standard supply voltages Connection Diagram Dual-In-Line Package DS009446-1 Top View Order Number DS75107M, DS75107N 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→ Package→ Input Sensitivity→ 0˚C ≤ TA ≤ +70˚C Cavity or Molded Dip ± 25 mV ± 10 mV Output Logic ↓ TTL Active Pull-Up DS75107 TTL Open Collector © 1999 National Semiconductor Corporation DS009446 www.national.com DS75107 Dual Line Receiver May 1999 Absolute Maximum Ratings (Note 1) Strobe Input Voltage 5.5V Storage Temperature Range −65˚C to +150˚C Maximum Power Dissipation (Note 1) at 25˚C Cavity Package 1308 mW Molded Package 1207 mW Lead Temperature (Soldering, 4 sec) 260˚C If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage, VCC+ Supply Voltage, VCC− Differential Input Voltage Common Mode Input Voltage 7V −7V ± 6V ± 5V Note: Derate cavity package 8.7 mW/˚C above 25˚C; derate molded package 9.7 mW/˚C above 25˚C. Operating Conditions DS75107 Min Nom Max Supply Voltage VCC+ 4.75V 5V 5.25V Supply Voltage VCC− −4.75V −5V −5.25V 0˚C to +70˚C Operating Temperature Range DS75107 Electrical Characteristics TMIN ≤ TA ≤ TMAX(Notes 2, 3) Symbol IIH Parameter High Level Input Current into A1, B1, A2 or B2 IIL Low Level Input Current into A1, B1, A2 or B2 IIH High Level Input Current into G1 or G2 IIL Low Level Input Current into G1 or G2 IIH High Level Input Current into S IIL Low Level Input Current into S VOH High Level Output Voltage VOL IOH IOS ICCH+ −10 Units µA µA µA 1 mA VCC+ = Max, VCC− = Max VCC+ = Max, VCC− = Max, VIL(S) = 0.4V VIH(S) = 2.4V VIH(S) = Max VCC+ Short Circuit Output Current www.national.com 75 40 VOH = Max VCC+ VCC+ = Max, VCC− = Max, Input Clamp Voltage on G or S Max 30 VIH(S) Max VCC+ High Level Output Current High Logic Level Supply Typ VIH(S) = 2.4V ISINK = 16 mA, VID = −25 mV, VIC = −3V to 3V VCC+ = Min, VCC− = Min High Logic Level Supply Min VCC− = Max VCC+ = Max, VCC− = Max, VIL(S) = 0.4V Low Level Output Voltage Current from VCC VI VCC+ = Max, VCC− = Max, VID = −2V, VIC = −3V to 3V VCC+ = Max, VCC+ = Min, VCC− = Min, ILOAD = −400 µA, VID = 25 mV, VIC = −3V to 3V, (Note 3) VCC+ = Min, VCC− = Min, Current from VCC ICCH− Conditions VCC+ = Max, VCC− = Max, VID = 0.5V, VIC = −3V to 3V (Notes 3, 5) VCC+ = Max, VCC− = Max, VID = 25 mV, TA = 25˚C −1.6 80 µA 2 mA −3.2 2.4 mA V 0.4 250 −18 −70 18 30 VCC+ = Max, VCC− = Max, VID = 25 mV, TA = 25˚C −8.4 −15 VCC+ = Min, VCC− = Min, IIN = −12 mA, TA = 25˚C −1 −1.5 2 mA V µA mA mA mA V Switching Characteristics VCC+ = 5V, VCC− = −5V, TA = 25˚C Symbol Parameter Conditions RL = 390Ω, CL = 50 pF, (Note 4) tPLH(D) Propagation Delay Time, Low to High Level, from Differential Inputs A and B to Output tPHL(D) Propagation Delay Time, High to Low Level, from Differential Inputs A and B to Output RL = 390Ω, CL = 50 pF, (Note 4) tPLH(S) Propagation Delay Time, Low to High Level, from Strobe Input G or S to Output RL = 390Ω, CL = 50 pF Propagation Delay Time, High to Low Level, from Strobe Input G or S to Output RL = 390Ω, CL = 50 pF tPHL(S) Min Typ Max Units 17 25 ns 19 25 ns 17 25 ns 19 25 ns 10 15 ns 13 20 ns 8 15 ns 13 20 ns Switching Characteristics VCC+ = 5V, VCC− = −5V, TA = 25˚C Symbol tPLH(D) Parameter Propagation Delay Time, Low-to- Conditions RL = 470Ω, CL = 15 pF, (Note 6) Min High Level, from Differential Typ Max Units 35 ns 20 ns 17 ns 17 ns Inputs A and B to Output tPHL(D) Propagation Delay Time, High-to- RL = 470Ω, CL = 15 pF, (Note 6) Low Level, from Differential Inputs A and B to Output tPLH(S) Propagation Delay Time, Low-to- RL = 470Ω, CL = 15 pF High Level, from Strobe Input G or S to Output tPHL(S) Propagation Delay Time, High-to- RL = 470Ω, CL = 15 pF Low Level, from Strobe Input G or S to Output 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 0˚C to +70˚C range for the DS75107. All typical values are for TA = 25˚C and VCC = 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: Differential input is +100 mV to −100 mV pulse. Delays read from 0 mV on input to 1.5V on output. Note 5: Only one output at a time should be shorted. Note 6: Differential input is +10 mV to −30 mV pulse. Delays read from 0 mV on input to 1.5V on output. Voltage Waveforms DS009446-12 3 www.national.com Typical Applications Data-Bus or Party-Line System DS009446-2 Data-Bus or Party-Line System DS009446-3 The typical data delay in a system is approximately (30 + 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 ≅ 1⁄2 IO(on) x RT: (1) APPLICATION The DS75107 dual line circuit is 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. Cross-talk is minimized by low signal amplitudes and low line impedances. www.national.com High series line resistance will cause degradation of the signal. The receivers, however, will detect signals as low as 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 ≅ IO(on) x RT: (2) 4 Typical Applications (Continued) Increasing Common Mode Input Voltage Range of Receiver The strobe feature of the receiver and the inhibit feature of the driver allows the DS75107 dual line circuit 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. 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 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. DS009446-5 DS75108 Wired-OR Output Connections 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 swing is symmetrical about it for maximum noise margin. The reference voltage should be in the range of −3.0V to +3.0V. It can be provided by a voltage supply or by a voltage divider from an available supply voltage. Unbalanced or Single-Line Systems DS009446-6 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. DS009446-4 “A” Devices 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 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 −3.0V and +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 DS75107 line receiver features a common mode input voltage range of ± 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 ± 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. DS009446-7 5 www.national.com Typical Applications (Continued) Standard Devices Standard Devices DS009446-10 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. DS009446-8 The input protection diodes are useful in certain party-line systems which may have multiple V+ power supplies and, in which case, may be operated with some of the V+ 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 DS009446-9 www.national.com 6 Schematic Diagrams DS55107/DS75107, DS75108, DS75208 DS009446-11 ⁄ of the dual circuit is shown. *Indicates connections common to second half of dual circuit. Components shown with dash lines are applicable to the DS55107, DS75207 and DS75107 only. 12 7 www.national.com Physical Dimensions inches (millimeters) unless otherwise noted Ceramic Dual-In-Line Package (J) Order Number DS75107J NS Package Number J14A Molded Dual-In-Line Package (M) Order Number DS75107M, DS75107AM NS Package Number M14A www.national.com 8 DS75107 Dual Line Receiver Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Molded Dual-In-Line Package (N) Order Number DS75107N, DS75107AN 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. 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 Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: [email protected] www.national.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: [email protected] Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Français Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80 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 Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: [email protected] National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 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.