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Part: SN75179BPS
Category:
Interface and Interconnect
-> RS-485
Description: ti SN75179B, Differential Driver And Receiver Pair
Company: Texas Instruments, Inc.
Datasheet: Download SN75179BPS datasheet File size : 255 kB
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Datasheet text preview:
SN75179B DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS003E OCTOBER 1985 REVISED JUNE 1998
D D D D D D D D D D
Meets or Exceeds the Requirements of TIA/EIA-422-B, TIA/EIA-485-A, and ITU Recommendation V.11 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
description
The SN75179B is a differential driver and receiver pair designed for balanced transmission-line applications and meets TIA/EIA-422-B, TIA/EIA-485-A, and ITU Recommendation V.11. It is designed to improve the performance of full-duplex data communications over long bus lines. The SN75179B driver output provides limiting for both positive and negative currents. 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 7 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 SN75179B is designed to drive current loads of up to 60 mA maximum. The SN75179B is characterized for operation from 0°C to 70°C. Function Tables
DRIVER INPUT D H L OUTPUTS Y H L RECEIVER DIFFERENTIAL INPUTS AB VID 0.2 V 0.2 V < VID < 0.2 V VID 0.2 V Open OUTPUT R H ? L ? Z L H
H = high level, L = low level, ? = indeterminate
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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 © 1998, Texas Instruments Incorporated
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
1
SN75179B DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS003E OCTOBER 1985 REVISED JUNE 1998
logic symbol
2 R 3 D 8 7 6 5 A B Z Y
logic diagram (positive logic)
8 R 2 7 6 D 3 5 A B Z Y
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
schematics of inputs and outputs
EQUIVALENT OF DRIVER INPUT VCC TYPICAL OF ALL DRIVER OUTPUTS VCC
Input Output
GND Driver input: R(eq) = 3 k NOM R(eq) = equivalent resistor EQUIVALENT OF EACH RECEIVER INPUT VCC TYPICAL OF ALL RECEIVER OUTPUTS VCC 85 NOM 960 NOM Input 16.8 k NOM 960 NOM Output
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POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SN75179B DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS003E OCTOBER 1985 REVISED JUNE 1998
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, VID (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 25 V Package thermal impedance, JA (see Note 3): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197°C/W P package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104°C/W Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. 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. 3. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace length of zero.
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 4.75 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.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
3
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