DS75176B/DS75176BT Multipoint RS-485/RS-422 Transceivers DS75176B

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DS75176B/DS75176BT Multipoint RS-485/RS-422 Transceivers DS75176B

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DS75176B/DS75176BT Multipoint RS-485/RS-422 Transceivers
DS75176B/DS75176BT Multipoint RS-485/RS-422 Transceivers
DS75176B high speed differential TRI-STATE bus/line transceiver designed meet requirements standard RS485 with extended common mode range (+12V -7V), multipoint data transmission. addition, compatible with RS-422. driver receiver outputs feature TRI-STATE capability, driver outputs over entire common mode range +12V -7V. contention fault situations that cause excessive power dissipation within device handled thermal shutdown circuit, which forces driver outputs into high impedance state. specifications guaranteed over 70°C temperature 4.75V 5.25V supply voltage range.
Features
Meets standard RS485 multipoint transmission compatible with RS-422. Small Outline (SO) Package option available minimum board space. driver propagation delays. Single supply. +12V common mode range permits ground difference between devices bus. Thermal shutdown protection. High impedance with driver TRI-STATE with power off, over entire common mode range allows unused devices powered down. compatible with DS3695/A SN75176A/B. Combined impedance driver output receiver input less than RS485 unit load, allowing transceivers bus. typical receiver hysteresis.
Connection Logic Diagram
DS008759-1
View Order Number DS75176BN, DS75176BTN, DS75176BM DS75176BSee Package Number N08E M08A
TRI-STATE registered trademark National Semiconductor Corp.
1999 National Semiconductor Corporation
DS008759
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Absolute Maximum Ratings (Note
Military/Aerospace specified devices required, please contact National Semiconductor Sales Office/ Distributors availability specifications. Supply Voltage, Control Input Voltages Driver Input Voltage Driver Output Voltages Receiver Input Voltages (DS75176B) Receiver Output Voltage Continuous Power Dissipation 25°C Package Package Storage Temperature Range Lead Temperature (Soldering, seconds) +15V/ -10V +15V/ -10V 5.5V (Note (Note -65°C +150°C 260°C
Recommended Operating Conditions
Supply Voltage, Voltage Terminal (Separate Common Mode) Operating Free Temperature DS75176B DS75176BT Differential Input Voltage, (Note 4.75 5.25 Units
Electrical Characteristics (Notes 70°C, 4.75V 5.25V unless otherwise specified
Symbol VOD1 VOD2 Parameter Differential Driver Output Voltage (Unloaded) Differential Driver Output Voltage (with Load) Change Magnitude Driver Differential Output Voltage Complementary Output States |VOC| Driver Common Mode Output Voltage Change Magnitude Driver Common Mode Output Voltage Complementary Output States IOZR IOSD Input High Voltage Input Voltage Input Clamp Voltage Input Current Input High Current Input Current Differential Input Threshold Voltage Receiver Receiver Input Hysteresis Receiver Output High Voltage Output Voltage OFF-State (High Impedance) Output Current Receiver Receiver Input Resistance Supply Current Driver Short-Circuit Output Current -400 (Note 0.4V 2.4V +12V Load (Note (Note +12V (Note Driver Outputs Enabled Driver Outputs Disabled -250 +250 DO/RI, DO/RI 5.25V 0.4V 2.4V -0.2 -1.5 -200 +1.0 -0.8 +0.2 (Figure (Figure (RS-422) (Note (RS-485) Conditions Units
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Electrical Characteristics (Notes
Symbol IOSR Parameter Receiver Short-Circuit Output Current
(Continued)
70°C, 4.75V 5.25V unless otherwise specified Conditions Units
Note "Absolute Maximum Ratings" those beyond which safety device cannot guaranteed. They meant imply that device should operated these limits. tables "Electrical Characteristics" provide conditions actual device operation. Note currents into device pins positive; currents device pins negative. voltages referenced device ground unless otherwise specified. Note typicals given 25°C. Note Derate linearly 5.56 mW/°C 70°C. Note Derate linearly 6.11 mW/°C 70°C. Note Differential Input/Output voltage measured noninverting terminal with respect inverting terminal Note worst case parameters which note applied, must increased DS75176BT. other parameters remain valid -40°C +85°C.
Switching Characteristics
5.0V, 25°C Symbol tPLH tPHL tPLH tPHL Parameter Driver Input Output Driver Input Output Driver Rise Time Driver Fall Time Driver Enable Output High Driver Enable Output Driver Disable Time from Driver Disable Time from High Receiver Input Output Receiver Input Output Receiver Enable Output Receiver Enable Output High Receiver Disable from Receiver Disable from High RLDIFF RLDIFF =CL2 (Figure Figure (Figure Figure Open (Figure Figure Open (Figure Figure Open (Figure Figure Open (Figure Figure Closed (Figure Figure Open (Figure Figure Open (Figure Figure Open (Figure Figure Open Conditions Units
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Test Circuits
DS008759-2
FIGURE
DS008759-3
Note: load circuit closed except otherwise mentioned.
FIGURE
DS008759-4
FIGURE
DS008759-5
Note: Unless otherwise specified switches closed.
FIGURE
Switching Time Waveforms
DS008759-6
FIGURE Driver Propagation Delays Transition Times
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Switching Time Waveforms
(Continued)
DS008759-7
FIGURE Driver Enable Disable Times
DS008759-8
Note: Differential input voltage realized grounding pulsing between +2.5V -2.5V
FIGURE Receiver Propagation Delays
DS008759-9
FIGURE Receiver Enable Disable Times
Function Tables DS75176B Transmitting
Inputs Line Condition Fault Fault Fault Outputs
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Function Tables
(Continued)
DS75176B Receiving
Inputs RI-RI +0.2V -0.2V Inputs Open** Outputs
Don't care condition High impedance state Fault Improper line conditons causing excessive power dissipation driver, such shorts contention situations **This fail safe condition
Typical Application
DS008759-11
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Physical Dimensions
inches (millimeters) unless otherwise noted
Lit. 103669
Molded Dual-In-Line Package Order Number DS75176BN DS75176BTN Package Number N08E
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DS75176B/DS75176BT Multipoint RS-485/RS-422 Transceivers
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT NATIONAL SEMICONDUCTOR CORPORATION. used herein: critical component component life support Life support devices systems devices sysdevice system whose failure perform reatems which, intended surgical implant into sonably expected cause failure life support body, support sustain life, whose faildevice system, affect safety effectiveness. perform when properly used accordance with instructions provided labeling, reasonably expected result significant injury user.
National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com National Semiconductor Europe Fax: 80-530 Email: europe.support@nsc.com Deutsch Tel: 80-530 English Tel: 80-532 Tel: 80-532 Italiano Tel: 80-534 National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: sea.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507
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National does assume responsibility circuitry described, circuit patent licenses implied National reserves right time without notice change said circuitry specifications.

DS75176B/DS75176BT Multipoint RS-485/RS-422 Transceivers DS75176B

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