Differential Bus Repeaters
Meets EIA Standards RS-422-A and RS-485 and CCITT
Recommendations V.11 and X.27 Designed for Multipoint Transmission on Long Bus Lines in Noisy Environments 3-State Outputs Bus Voltage Range. 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
description
The SN75177B and SN75178B differential bus repeaters are monolithic integrated devices each designed for one-way data communication on multipoint bus transmission lines. These devices are designed for balanced transmission bus line applications and meet EIA Standard RS-422-A and RS-485 and CCITT Recommendations V.11 and X.27. Each device is designed to improve the performance of the data communication over long bus lines. The SN75177B and SN75178B are identical except for the complementary enable inputs, which allow the devices to be used in pairs for bidirectional communication. The SN75177B and SN75178B feature positive- and negative-current limiting 3-state outputs for the receiver and driver. The receiver features high input impedance, input hysteresis for increased noise immunity, and input sensitivity 200 mV over a common-mode input voltage range 12 V. The driver features thermal shutdown for protection from line fault conditions. Thermal shutdown is designed to occur at a junction temperature of approximately 150°C. The driver is designed to drive current loads 60 mA maximum. The SN75177B and SN75178B are designed for optimum performance when used on transmission buses employing the SN75172 and SN75174 differential line drivers, SN75173 and SN75175 differential line receivers, or SN75176B bus transceiver. Function Tables
SN75177B DIFFERENTIAL INPUTS AB VID V < VID 0.2 V VID V X ENABLE EN SN75178B DIFFERENTIAL INPUTS AB VID V < VID 0.2 V VID V X ENABLE EN OUTPUTS
H = high level, L = low level, ? = indeterminate, X = irrelevant, Z = impedance (off)
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.
These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
EQUIVALENT OF EACH INPUT VCC Req TYPICAL OF ALL DRIVER OUTPUTS VCC
Driver input: Req 3 k NOM Enable inputs: Req 8 k NOM EQUIVALENT OF EACH RECEIVER INPUT VCC
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC (see Note 7 V Voltage range at any bus terminal. 15 V Differential input voltage (see Note 25 V Enable input voltage. 5.5 V Continuous total dissipation. See Dissipation Rating Table Operating free-air temperature range. to 70°C Storage temperature range. to 150°C Lead temperature mm (1/16 inch) from case for 10 seconds. 260°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 TA 25°C POWER RATING 1000 mW DERATING FACTOR ABOVE 25°C 5.8 mW/°C 8.0 mW/°C = 70°C POWER RATING 640 mW
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, High-level current IOH Low level output current, Low-level current IOL Driver Receiver Driver Receiver or EN NOM 5 MAX 5.25 UNIT µA mA
Operating free-air temperature, 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.
Meets EIA Standards RS-422-A and RS-485 and CCITT
Recommendations V.11 and X.27 Designed for Multipoint Transmission on Long Bus Lines in Noisy Environments 3-State Outputs Bus Voltage Range. 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
description
The SN75177B and SN75178B differential bus repeaters are monolithic integrated devices each designed for one-way data communication on multipoint bus transmission lines. These devices are designed for balanced transmission bus line applications and meet EIA Standard RS-422-A and RS-485 and CCITT Recommendations V.11 and X.27. Each device is designed to improve the performance of the data communication over long bus lines. The SN75177B and SN75178B are identical except for the complementary enable inputs, which allow the devices to be used in pairs for bidirectional communication. The SN75177B and SN75178B feature positive- and negative-current limiting 3-state outputs for the receiver and driver. The receiver features high input impedance, input hysteresis for increased noise immunity, and input sensitivity 200 mV over a common-mode input voltage range 12 V. The driver features thermal shutdown for protection from line fault conditions. Thermal shutdown is designed to occur at a junction temperature of approximately 150°C. The driver is designed to drive current loads 60 mA maximum. The SN75177B and SN75178B are designed for optimum performance when used on transmission buses employing the SN75172 and SN75174 differential line drivers, SN75173 and SN75175 differential line receivers, or SN75176B bus transceiver. Function Tables
SN75177B DIFFERENTIAL INPUTS AB VID V < VID 0.2 V VID V X ENABLE EN SN75178B DIFFERENTIAL INPUTS AB VID V < VID 0.2 V VID V X ENABLE EN OUTPUTS
H = high level, L = low level, ? = indeterminate, X = irrelevant, Z = impedance (off)
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.
These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
EQUIVALENT OF EACH INPUT VCC Req TYPICAL OF ALL DRIVER OUTPUTS VCC
Driver input: Req 3 k NOM Enable inputs: Req 8 k NOM EQUIVALENT OF EACH RECEIVER INPUT VCC
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC (see Note 7 V Voltage range at any bus terminal. 15 V Differential input voltage (see Note 25 V Enable input voltage. 5.5 V Continuous total dissipation. See Dissipation Rating Table Operating free-air temperature range. to 70°C Storage temperature range. to 150°C Lead temperature mm (1/16 inch) from case for 10 seconds. 260°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 TA 25°C POWER RATING 1000 mW DERATING FACTOR ABOVE 25°C 5.8 mW/°C 8.0 mW/°C = 70°C POWER RATING 640 mW
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, High-level current IOH Low level output current, Low-level current IOL Driver Receiver Driver Receiver or EN NOM 5 MAX 5.25 UNIT µA mA
Operating free-air temperature, 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.
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