High Speed Standard Supply Voltage Dual Channels High Common-Mode Reje

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High Speed Standard Supply Voltage Dual Channels High Common-Mode Reje

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SN55107A, SN55107B, SN55108A, SN55108B SN75107A, SN75107B, SN75108A, SN75108B DUAL LINE RECEIVERS
High Speed Standard Supply Voltage Dual Channels High Common-Mode Rejection Ratio High Input Impedance High Input Sensitivity Differential Common-Mode Input Voltage Range Strobe Inputs Receiver Selection Gate Inputs Logic Versatility Drive Capability High Noise Margin '107A '107B Have Totem-Pole Outputs '108A '108B Have Open-Collector Outputs Versions Have Diode-Protected Input Power-Off Condition
SN55107A, SN55107B, SN55108A, SN55108B PACKAGE SN75107A, SN75107B, SN75108A, SN75108B PACKAGE (TOP VIEW)
SN55107A, SN55107B, SN55108A, SN55108B PACKAGE (TOP VIEW)
description
These circuits TTL-compatible, high-speed line receivers. Each monolithic dual circuit featuring independent channels. They designed general well such specific applications data comparators balanced, unbalanced, party-line transmission systems. These devices unilaterally interchangeable with replacements SN55107, SN55108, SN75107, SN75108, offer diode-clamped strobe inputs simplify circuit design.
internal connection
SN75108B RECOMMENDED DESIGN
essential difference between versions seen schematics. Input-protection diodes series with collectors differential-input transistors versions. These diodes useful certain party-line systems that have multiple power supplies operated with some supplies turned off. such system, supply turned allowed ground, equivalent input circuit connected that supply would follows:
Input Input
Version
Version
This would problem specific systems that might possibly have transmission lines biased some potential greater than SN55107A, SN55107B, SN55108A, SN55108B characterized operation over full military temperature range 55°C 125°C. SN75107A, SN75107B, SN75108A, SN75108B characterized operation from 70°C.
PRODUCTION DATA information current publication date. Products conform specifications terms Texas Instruments standard warranty. Production processing does necessarily include testing parameters.
Copyright 1995, Texas Instruments Incorporated
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SN55107A, SN55107B, SN55108A, SN55108B SN75107A, SN75107B, SN75108A, SN75108B DUAL LINE RECEIVERS
logic symbols
SN55107 SN75107 SN55108 SN75108
These symbols accordance with ANSI/IEEE 91-1984 Publication 617-12. numbers shown packages.
logic diagram (positive logic)
FUNCTION TABLE DIFFERENTIAL INPUTS STROBES high level, level, irrelevant OUTPUT Indeterminate
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schematic (each receiver)
Output
Inputs
Strobe
4.25 Common Both Receivers Strobe
Other Receiver numbers shown packages. '107A '107B, '108A '108B. NOTES: Resistor values shown nominal. Components shown with dashed lines output circuitry applicable '107A '107B only. Diodes series with collectors differential input transistors short circuited '107A '108A.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, (see Note Supply voltage, Differential input voltage, (see Note Common-mode input voltage, (see Note Strobe input voltage Continuous total dissipation Dissipation Rating Table Operating free-air temperature range, SN55' 55°C 125°C SN75' 70°C Storage temperature range, Tstg 65°C 150°C Case temperature seconds, package 260°C Lead temperature (1/16 inch) from case seconds: package 300°C Lead temperature (1/16 inch) from case seconds: package 260°C
Stresses beyond those listed under "absolute maximum ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated under "recommended operating conditions" implied. Exposure absolute-maximum-rated conditions extended periods affect device reliability. NOTES: voltage values, except differential voltages, with respect network ground terminal. Differential voltage values noninverting terminal with respect inverting terminal. Common-mode input voltage average voltages inputs.
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DISSIPATION RATING TABLE PACKAGE (SN5510_A,B) (SN7510_A,B) 25°C POWER RATING 1375 1375 1025 1150 1000 DERATING FACTOR ABOVE 25°C mW/°C 11.0 mW/°C 11.0 mW/°C mW/°C mW/°C mW/°C 70°C POWER RATING 125°C POWER RATING
recommended operating conditions (see Note
SN55107A, SN55107B SN55108A, SN55108B Supply voltage, Supply voltage, High-level input voltage between differential inputs, VIDH (see Note Low-level input voltage between differential inputs, VIDL (see Note Common-mode input voltage, (see Notes Input voltage, differential input (see Note High-level input voltage strobe inputs, VIH(S) Low-level input voltage strobe inputs, VIL(S) Low-level output current, 0.025 0.025 SN75107A, SN75107B SN75108A, SN75108B 4.75 4.75 0.025 5.25 5.25 0.025 UNIT
Operating free-air temperature, algebraic convention, which less positive (more negative) limit designated minimum, used this data sheet input voltage levels only. NOTES: When using only channel line receiver, strobe unused channel should grounded least differential inputs unused receiver should terminated some voltage between recommended combinations input voltages fall within shaded area Figure common-mode voltage provided that more positive inputs more negative than
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SN55107A, SN55107B, SN55108A, SN55108B SN75107A, SN75107B, SN75108A, SN75108B DUAL LINE RECEIVERS
RECOMMENDED COMBINATIONS INPUT VOLTAGES
Input Voltage
Input Voltage
Figure Recommended Combinations Input Voltages
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SN55107A, SN55107B, SN55108A, SN55108B SN75107A, SN75107B, SN75108A, SN75108B DUAL LINE RECEIVERS
electrical characteristics over recommended free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN, VIL(S) VIDH MIN, VIH(S) VIDL MAX, MAX, MAX, MAX, MAX, MAX, MIN, MAX, MAX, 25°C 25°C VIH(G) VIH(G) VIL(G) VIH(S) VIH(S) VIL(S)= '107A, '107B '108A, '108B UNIT
High-level High level output voltage
Low-level level output voltage High-level input current Low-level input current High-level input current into Low-level input current into High-level input current into Low-level input current into High-level output current Short-circuit output Supply current from outputs high Supply current from outputs high
ICCH ICCH
conditions shown MAX, appropriate value specified under recommended operating conditions. typical values 25°C. more than output should shorted time.
switching characteristics, 25°C, (see Figure
PARAMETER tPLH(D) tPHL(D) tPLH(S) tPHL(S) Propagation delay time, low- high-level output, from differential inputs Propagation delay time, high- low-level output, from differential inputs Propagation delay time, low- high-level output, from strobe input Propagation delay time, high- low-level output, from strobe input TEST CONDITIONS '107A, '107B '108A, 108B UNIT
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SN55107A, SN55107B, SN55108A, SN55108B SN75107A, SN75107B, SN75108A, SN75108B DUAL LINE RECEIVERS
PARAMETER MEASUREMENT INFORMATION
Differential Input Pulse Generator (see Note (see Note Output `107A, `107B
VCC+
(see Note
Output `108A, `108B (see Note
Strobe Input (see Note
Pulse Generator (see Note TEST CIRCUIT Input Strobe Input PLH(D) PHL(D) PLH(S) PHL(S) Output VOLTAGE WAVEFORMS NOTES: pulse generators have following characteristics: tpd1 MHz, tpd2 kHz. Strobe input pulse applied Strobe when inputs 1A-1B being tested, Strobe when inputs 1A-1B 2A-2B being tested, Strobe when inputs 2A-2B being tested. includes probe capacitance. diodes 1N916.
Figure Test Circuit Voltage Waveforms
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SN55107A, SN55107B, SN55108A, SN55108B SN75107A, SN75107B, SN75108A, SN75108B DUAL LINE RECEIVERS
TYPICAL CHARACTERISTICS
OUTPUT VOLTAGE DIFFERENTIAL INPUT VOLTAGE
High-Level Input Current '108A, '108B Output Voltage Inverting Inputs Noninverting Inputs
HIGH-LEVEL INPUT CURRENT FREE-AIR TEMPERATURE
'107A, '107B
Supply Current
Propagation Delay Time
Differential Input Voltage
Free-Air Temperature
Figure
SUPPPLY CURRENT (OUTPUTS HIGH) FREE-AIR TEMPERATURE
Figure
PROPAGATION DELAY TIME (DIFFERENTIAL INPUTS) FREE-AIR TEMPERATURE
tPHL(D) tPLH(D)
Free-Air Temperature
Free-Air Temperature
Figure
Figure
Values below above 70°C apply SN55' only.
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TYPICAL CHARACTERISTICS
PROPAGATION DELAY TIME (LOW-TO-HIGH LEVEL) (DIFFERENTIAL INPUTS) FREE-AIR TEMPERATURE
tPLH(D) PLH(D) Propagation Delay Time tPLH(D) PLH(D) Propagation Delay Time 3900
PROPAGATION DELAY TIME (LOW-TO-HIGH LEVEL) (DIFFERENTIAL INPUTS) FREE-AIR TEMPERATURE
1950
1950 3900
Free-Air Temperature
Free-Air Temperature
Figure
'108A, '108B
Figure
'108A, '108B
PROPAGATION DELAY TIME (STROBE INPUTS) FREE-AIR TEMPERATURE
tPLH(S)
PROPAGATION DELAY TIME (STROBE INPUTS) FREE-AIR TEMPERATURE
Propagation Delay Time tPLH(S) tPHL(S)
Propagation Delay Time
tPHL(S)
Free-Air Temperature
Free-Air Temperature
Figure
Values below above 70°C apply SN55' only.
Figure
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SN55107A, SN55107B, SN55108A, SN55108B SN75107A, SN75107B, SN75108A, SN75108B DUAL LINE RECEIVERS
APPLICATION INFORMATION basic balanced-line transmission system
'107A, '107B, '108A, '108B dual line circuits designed specifically high-speed data transmission systems that utilize balanced terminated transmission lines such twisted-pair lines. system operates balanced mode, noise induced line also induced other. noise appears common mode receiver input terminals where rejected. ground connection between line driver receiver part signal circuit that system performance affected circulating ground currents. unique driver-output circuit allows terminated transmission lines driven normal line impedances. High-speed system operation ensured since line reflections virtually eliminated when terminated lines used. Crosstalk minimized signal amplitudes line impedances. typical data delay system approximately where distance feet separating driver receiver. This delay includes gate delay both driver receiver. Data impressed balanced-line system unbalancing line voltages with driver output current. driven line selected appropriate driver-input logic levels. voltage difference approximately: VDIFF 1/2IO(on) High series line resistance will cause degradation signal. receivers, however, will detect signals less). normal line resistances, data recovered from lines several thousand feet length. Line-termination resistors (RT) required only extreme ends line. short lines, termination resistors receiver only prove adequate. signal amplitude will then approximately: VDIFF IO(on)
Data Input Inhibit Driver SN55109A, SN55110A, SN75109A, SN75110A, SN75112 Strobes Receiver `107A, `107B, `108A, `108B
Transmission Line Having Characteristic Impedance ZO/2
Figure Typical Differential Data Line
data-bus party-line system
strobe feature receivers inhibit feature drivers allow these dual line circuits used data-bus party-line systems. these applications, several drivers receivers share common transmission line. enabled driver transmits data enabled receivers line while other drivers receivers disabled. Data thus time multiplexed transmission line. device specifications allow widely varying thermal electrical environments various driver receiver locations. data-bus system offers maximum performance minimum cost.
2-10
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SN55107A, SN55107B, SN55108A, SN55108B SN75107A, SN75107B, SN75108A, SN75108B DUAL LINE RECEIVERS
APPLICATION INFORMATION
Drivers SN55109A, SN55110A, SN75109A, SN75110A, SN75112
Receiver
Receiver Strobes
Receiver Strobes
Strobes
Location Data Input Inhibit Location Driver Location Driver Location Driver Receivers `107A, `107B, `108A, `108B
Figure Typical Differential Party Line
unbalanced single-line systems
These dual-line circuits also used unbalanced single-line systems. Although these systems offer same performance balanced systems long lines, they adequate very short lines where environmental noise severe. receiver threshold level established applying reference voltage receiver input terminal. signal from transmission line applied remaining input. reference voltage should optimized that signal swing symmetrical about maximum noise margin. reference voltage should range provided voltage supply voltage divider from available supply voltage. single-ended output from driver used single-line systems. Coaxial shielded line preferred minimum noise crosstalk problems. large signal swings, high output current (typically SN75112 recommended. Drivers paralleled higher current. When using only channel line drivers, other channel should inhibited and/or have outputs grounded.
SN55109A, SN55110A, SN75109A, SN75110A, SN75112 Input Output Input Vref Strobes `107A, `107B, `108A, `108B Output
Inhibit
Figure Single-Ended Operation
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SN55107A, SN55107B, SN55108A, SN55108B SN75107A, SN75107B, SN75108A, SN75108B DUAL LINE RECEIVERS
APPLICATION INFORMATION '108A, '108B dot-AND output connections
'108A, '108B line receivers feature open-collector-output circuit that connected dot-AND logic configuration with other similar open-collector outputs. This allows level logic implemented without additional logic delay.
`108A, `108B
`108A, `108B Output SN5401/SN7401 Equivalent Dot-AND Connection
increasing common-mode input voltage range receiver
Figure Dot-AND Connection common-mode voltage range (CMVR) defined range voltage applied simultaneously both input terminals that exceeded does allow normal operation receiver. recommended operating CMVR making useful noisiest environments. extremely noisy environments, common-mode voltage easily reach some precautions taken reduce ground power supply noise, well crosstalk problems. When receiver must operate such conditions, input attenuators should used decrease system common-mode noise tolerable level receiver inputs. Differential noise also reduced same ratio. These attenuators have been intentionally omitted from receiver input terminals designer select resistors that will compatible with particular application environment. Furthermore, attenuators adversely affects input sensitivity, propagation delay time, power dissipation, some cases (depending selected resistor values) input impedance, therefore, reducing versatility receiver. ability receiver operate with approximately common-mode voltage inputs been checked using circuit shown Figure resistors provide voltage divider network. Dividers with three different values presenting 5-to-1 attenuation were used operate differential inputs approximately common-mode voltage. Careful matching attenuators needed balance overdrive input stage. resistors used shown Table Table shows some typical switching results obtained under such conditions. Table
Attenuator Attenuator Attenuator tPLH '107A,'107B tPHL
Table Typical Propagation Delays Receiver With Attenuator Test Circuit Shown Figure
DEVICE PARAMETERS INPUT ATTENUATOR TYPICAL (ns)
tPLH '108A,'108B tPHL
2-12
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APPLICATION INFORMATION
Attenuator Each Input Receiver
Figure Common-Mode Circuit Testing Input Attenuators With Results Shown Table methods terminating transmission line reduce reflections are:
Method Method
Figure Termination Techniques first method uses resistors attenuation network line termination. second method uses additional resistors line terminations.
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APPLICATION INFORMATION
party-line operation, method should used follows:
Attenuation Network
Figure Party-Line Termination Technique minimize loading, values should fairly large. Examples possible values shown Table
furnace control using SN75108A
furnace control circuit Figure example possible SN55107A Series areas other than what would normally considered electronic systems. Basically, description operation this control follows. When room temperature below desired level, resistance room temperature sensor high channel noninverting input below (less positive than) reference level input differential amplifier. This situation causes output, operating heat relay turning heat. channel noninverting input below reference level when bonnet temperature furnace reaches desired level. This causes output thus operating blower relay. Normally furnace shut down when room temperature reaches desired level channel output goes high, turning heat off. blower remains long bonnet temperature high, even after heat relay off. There also safety switch bonnet that shuts furnace down temperature there exceeds desired limitations. types temperature-sensing devices bias-resistor values used determined particular operating conditions encountered.
Bonnet Temp. Sensor Bonnet Upper Limit Switch
Room Temp. Sensor
Channel
Heat Relay Return
Room Temp. Setting
Blower Control Channel
Blower Relay Return
Figure Furnace Control Using SN75108A
2-14
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APPLICATION INFORMATION repeaters long lines
some cases, driven line long that noise level line reaches common-mode limits attenuation becomes large results poor reception. such case, simple application receiver driver repeaters [shown Figure 19(a)] restores signal level allows adequate signal level receiving end. multichannel operation desired, then proper gating each channel must sent through repeater station using another repeater Figure 19(b).
Repeaters Data Driver Receiver Driver Receiver Data
SINGLE-CHANNEL LINE
Data
Driver
Receiver
Driver
Receiver
Data
Clock
Strobe
Receiver
Driver
Receiver
MULTICHANNEL LINE WIDTH WITH STROBE
Figure Receiver-Driver Repeaters
receiver dual differential comparator
There many applications differential comparators, such voltage comparison, threshold detection, controlled Schmitt triggering, pulse-width control. differential comparator, '107A '108A connected compare noninverting input terminal with inverting input shown Figure Thus output will high resulting from input being greater less than reference. strobe inputs allow additional control over circuit that either output both inhibited.
Strobe
Reference Strobe Reference Strobe Output
Output
Figure SN55107A Series Receiver Dual Differential Comparator
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2-15
SN55107A, SN55107B, SN55108A, SN55108B SN75107A, SN75107B, SN75108A, SN75108B DUAL LINE RECEIVERS
APPLICATION INFORMATION window detector
window detector circuit Figure large number applications test equipment determining upper limits, lower limits, both same time such detecting whether voltage signal exceeded limits window. Illumination upper-limit (lower-limit) indicator shows that input voltage above (below) selected upper (lower) limit. mode selector provided selecting desired test. window detecting, upper lower limits test position used.
Upper Limit Input From Test Point Lower Limit Upper-Limit Indicator
Lower-Limit Indicator
Mode Selector MODE SELECTOR LEGEND POSITION CONDITION Test Upper Limit Test Lower Limit Test Upper Lower Limits
Figure Window Detector Using SN75108A
2-16
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APPLICATION INFORMATION temperature controller with zero-voltage switching
circuit Figure switches electric-resistive heater providing negative-going pulses gate triac during time interval when line voltage passing through zero. pulse generator 2N5447 four diodes. This portion circuit provides negative-going pulses during short time (approximately when line voltage near zero. These pulses inverting input channel '108A. room temperature below desired level, resistance thermistor high noninverting input channel above reference level determined thermostat setting. This provides high-level output from channel This output ANDed with positive-going pulses from output channel which reinverted 2N5449.
10-V Zener `108A 2N5447 Channel Channel Thermostat Setting 2N5449
Zener
Heater Load
Figure Zero-Voltage Switching Temperature Controller
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2-17
2-18
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High Speed Standard Supply Voltage Dual Channels High Common-Mode Reje

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