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 line transceiver designed meet requirements standard RS485 with extended common mode range b7V) multipoint data transmission addition compatible with RS-422 driver receiver outputs feature TRI-STATE capability driver outputs over entire common mode range 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 temperature 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 common mode range permits ground difference between devices Thermal shutdown protection High impedance with driver TRI-STATE with power over entire common mode range allows unused devices powered down compatible with DS3695 SN75176A Combined impedance driver output receiver input less than RS485 unit load allowing transceivers typical receiver hysteresis
Connection Logic Diagram
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View Order Number DS75176BN DS75176BTN DS75176BM DS75176BSee Package Number N08E M08A
TRI-STATE registered trademark National Semiconductor Corp C1996 National Semiconductor Corporation 8759 RRD-B30M36 Printed
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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 Package Package (Note (Note Storage Temperature Range
Lead Temperature (Soldering seconds)
Recommended Operating Conditions
Supply Voltage Voltage Terminal (Separate Common Mode) Operating Free Temperature DS75176B DS75176BT Differential Input Voltage (Note Units
Electrical Characteristics (Notes unless otherwise specified
Symbol VOD1 VOD2 DVOD Parameter Differential Driver Output Voltage (Unloaded) Differential Driver Output Voltage (with Load) Change Magnitude Driver Differential Output Voltage Complementary Output States Driver Common Mode Output Voltage Conditions Units (RS-422) (Note (RS-485)
(Figure
(Figure
lVOCl Change Magnitude Driver Common Mode Output Voltage Complementary Output States DVTH IOZR 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
b400 (Note
Driver Outputs Enabled Driver Outputs Disabled
Load (Note
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Electrical Characteristics (Notes unless otherwise specified (Continued)
Symbol IOSD IOSR Parameter Driver Short-Circuit Output Current Receiver Short-Circuit Output Current Conditions (Note (Note
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 Note Derate linearly Note Derate linearly 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
Switching Characteristics
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
Conditions Units
RLDIFF RLDIFF
(Figures
(Figures Open (Figures Open (Figures Open (Figures Open (Figures Closed (Figures Open (Figures Open (Figures Open (Figures Open
Test Circuits
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FIGURE
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Note load circuit closed except otherwise mentioned
FIGURE
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FIGURE
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Note Unless otherwise specified switches closed
FIGURE
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Switching Time Waveforms
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FIGURE Driver Propagation Delays Transition Times
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FIGURE Driver Enable Disable Times
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Note Differential input voltage realized grounding pulsing between
FIGURE Receiver Propagation Delays
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Switching Time Waveforms (Continued)
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FIGURE Receiver Enable Disable Times
Function Tables
DS75176B Transmitting Inputs Line Condition Fault Fault Fault Outputs
DS75176B Receiving Inputs
Fault Don't care condition High impedance state Improper line conditons causing excessive power dissipation driver such shorts contention situations This fail safe condition
Outputs RI-RI
Inputs Open
Typical Application
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Physical Dimensions inches (millimeters)
Small Outline Package Order Number DS75176BM DS75176BNS Package Number M08A
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DS75176B DS75176BT Multipoint RS-485 RS-422 Transceivers
Physical Dimensions inches (millimeters) (Continued)
103669
Molded Dual-In-Line Package Order Number DS75176BN DS75176BTN Package Number N08E
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT NATIONAL SEMICONDUCTOR CORPORATION used herein Life support devices systems devices systems which intended surgical implant into body support sustain life whose failure perform when properly used accordance with instructions provided labeling reasonably expected result significant injury user
National Semiconductor Corporation 1111 West Bardin Road Arlington 76017 1(800) 272-9959 1(800) 737-7018
critical component component life support device system whose failure perform reasonably expected cause failure life support device system affect safety effectiveness
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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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