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Part: SN75179A
Category:
Interface and Interconnect
-> RS-485/RS-422
-> Transceiver
Description: Differential Driver And Receiver Pair: 2 Drvrs/2 RCVRS
Company: Texas Instruments, Inc.
Datasheet: Download SN75179A datasheet File size : 255 kB
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Datasheet text preview:
SN75179A DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS123B D2845, JUNE 1984 REVISED FEBRUARY 1993
· · · · · · · · · ·
Meets EIA Standards RS-422A, RS423A, and CCITT Recommendations V.11 and X.27 Bus Voltage Range . . . 7 V to 12 V Positive and Negative Current Limiting Driver Output Capability . . . 60 mA Max Driver Thermal Shutdown Protection Receiver Input Impedance . . . 12 k Min Receiver Input Sensitivity . . . ± 200 mV Receiver Input Hysteresis . . . 50 mV Typ Operates From Single 5-V Supply Low Power Requirements
D OR P PACKAGE (TOP VIEW)
VCC R D GND
1 2 3 4
8 7 6 5
A B Z Y
NOT RECOMMENDED FOR NEW DESIGN
logic symbol
2 8 7 6 5 A B Z Y
description
The SN75179A driver and bus receiver circuit is a monolithic integrated device designed for balanced transmission line applications, and meets EIA Standards RS-422A, RS-423A, and CCITT Recommendations V.11 and X.27. It is designed to improve the performance of data communications over long bus lines. The SN75179A features positive- and negativecurrent limiting for the driver and receiver. The receiver features high input impedance, input hysteresis for increased noise immunity, and input sensitivity of ± 200 mV over a common-mode input voltage range of 12 V to 12 V. The driver provides thermal shutdown for protection from line fault conditions. Thermal shutdown is designed to occur at a junction temperature of approximately 150°C. The device is designed to drive current loads of up to 60 mA maximum. The SN75179A is characterized for operation from 0°C to 70°C. Function Tables
DRIVER INPUT D H L OUTPUTS Y Z H L L H R
D
3
logic diagram
2 8 7 6 5 A B Z Y
R
D
3
RECEIVER DIFFERENTIAL INPUTS AB VID 0.2 V 0.2 V < VID < 0.2 V VID 0.2 V ? = indeterminate OUTPUT R H ? L
H = high level,
L = low level,
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright © 1993, Texas Instruments Incorporated
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
21
SN75179A DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS123B D2845, JUNE 1984 REVISED FEBRUARY 1993
schematics of inputs and outputs
EQUIVALENT DRIVER OR ENABLE INPUT VCC Req TYPICAL OF ALL DRIVER OUTPUTS VCC
Input Output
Driver input: Req = 3 k NOM Enable inputs: Req = 8 k NOM EQUIVALENT OF EACH RECEIVER INPUT VCC
GND
TYPICAL OF ALL RECEIVER OUTPUTS 85 NOM VCC
960 NOM Input 16.8 k 960 NOM NOM Output
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Voltage range at any bus terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 V to 15 V Differential input voltage (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 25 V Continuous total dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table Operating free-air temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
NOTES: 1. All voltage values, except differential input voltage, are with respect to network ground terminal. 2. Differential-input voltage is measured at the noninverting input with respect to the corresponding inverting input. DISSIPATION RATING TABLE PACKAGE D P TA 25°C POWER RATING 725 mW 1000 mW DERATING FACTOR ABOVE TA = 25°C 5.8 mW/°C 8.0 mW/°C TA = 70°C POWER RATING 464 mW 640 mW
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POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SN75179A DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS123B D2845, JUNE 1984 REVISED FEBRUARY 1993
recommended operating conditions
MIN Supply voltage, VCC High-level input voltage, VIH Low-level input voltage, VIL Common-mode input voltage, VIC Differential input voltage, VID High-level output current, IOH output current Low-level output current, IOL output current Driver Receiver Driver Receiver Driver Driver 7 4.5 2 0.8 12 ± 12 60 400 60 8 NOM 5 MAX 5.25 UNIT V V V V V mA µA mA
Operating free-air temperature, TA 0 70 °C The algebraic convention, where the less-positive (more-negative) limit is designated minimum, is used in this data sheet for common-mode input voltage and threshold voltage.
DRIVER SECTION electrical characteristics over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER VIK VOH VOL |VOD1| |VOD2| |VOD| VOC |VOC| IO IIH IIL IOS Input clamp voltage High-level output voltage Low-level output voltage Differential output voltage Differential output voltage output voltage Change in magnitude of differential output voltage§ Common-mode output voltage¶ Change in magnitude of common-mode output voltage§ Output current with power off High-level input current Low-level input current Short-circuit output current VCC = 0, VI = 2.4 V VI = 0.4 V VO = 7 V VO = VCC VO = 12 V VO = 7 V to 12 V RL = 54 or 100 , See FIgure 13 TEST CONDITIONS II = 18 mA VIH = 2 V, IOH = 33 mA VIH = 2 V, IOH = 33 mA IO = 0 RL = 100 , RL = 54 , VIL = 0.8 V, VIL = 0.8 V, MIN TYP MAX 1.5 3.7 1.1 2 VOD2 See Figure 13 See Figure 13 2 1.5 2.7 2.4 ± 0.2 3 ± 0.2 ± 100 20 400 250 250 500 mA UNIT V V V V V V V V µA µA µA
ICC Supply current (total package) No load 50 mA All typical values are at VCC = 5 V and TA = 25°C. § |VOD| and |VOC| are the changes in magnitude of VOD and VOC, respectively, that occur when the input is changed from a high level to a low level. ¶ In EIA Standard RS-422A, VOC, which is the average of the two output voltages with respect to ground, is called output offset voltage, VOS.
switching characteristics, VCC = 5 V, TA = 25°C
PARAMETER tdD ttD Differential-output delay time Differential-output transition time TEST CONDITIONS RL = 60 60 , See Figure 3 Figure MIN TYP 40 65 MAX 60 95 UNIT ns ns
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
23
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