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SN75176BP

RS-485/RS-422 differential bus transceiver, 10Mbps, DIP-8, driver + receiver with enables

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Pieza del fabricante：

SN75176BP

Paquete：

DIP-8 (9.6 x 7.9 x 5.3mm)

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Descripción

Productos

The SN75176BP is a differential bus transceiver from Texas Instruments in DIP-8 package, implementing the RS-485 and RS-422 communication standards. It combines a tri-state differential line driver and a differential line receiver, both active simultaneously for full-duplex or half-duplex operation. The device features ±200mV receiver sensitivity, 60mA driver output current, and thermal shutdown protection, supporting data rates up to 10Mbps.

Especificaciones

Standard RS-485 / RS-422
Velocidad de datos Up to 10Mbps
Driver Output Current 60mA
Receiver Sensitivity ±200mV
Common-Mode Range -7V to +12V
Bus Pins ESD ±15kV HBM
Tensión de alimentación 5V (4.75-5.25V)
Supply Current 50mA max (driver active)
Paquete DIP-8 (9.6 x 7.9mm)
Temperatura de funcionamiento 0°C to +70°C

Características

  • Combined driver and receiver for bidirectional RS-485 communication
  • ±200mV receiver sensitivity for noise-immune data reception
  • -7V to +12V common-mode range for industrial environments
  • Thermal shutdown protection at 150°C
  • Driver and receiver enable pins for flexible bus control
  • Up to 32 nodes on a single bus

Aplicaciones

  • Industrial RS-485 communication networks (Modbus, PROFIBUS)
  • HVAC and building automation systems
  • Motor drive communication interfaces
  • Point-of-sale terminal networks
  • Laboratory and test equipment remote control

The SN75176BP is an RS-485/RS-422 differential bus transceiver from Texas Instruments in DIP-8, combining a tri-state differential driver and differential receiver on a single chip. The driver converts single-ended TTL/CMOS data into differential signals (A and B) suitable for transmission over twisted-pair cable up to 1200 meters (4000 feet). The receiver converts the differential signal back to single-ended TTL/CMOS with ±200mV sensitivity, providing excellent noise immunity in industrial environments. The driver and receiver can be active simultaneously for full-duplex 4-wire RS-422, or the DE (Driver Enable) and RE# (Receiver Enable) pins can be used for half-duplex 2-wire RS-485. The device supports up to 32 nodes on a single bus (one unit load per device). The common-mode range of -7V to +12V allows operation in the presence of ground potential differences between nodes. The thermal shutdown at 150°C protects against line contention faults. The -BP suffix specifies DIP-8, commercial temperature (0°C to +70°C). The SN75176 is one of the most widely used RS-485 transceivers in the industry, with second-source availability from multiple manufacturers.

The SN75176BP contains two independent functional blocks: a differential driver and a differential receiver, each with its own enable control. The driver: When DE (Driver Enable) is HIGH, the driver is active. The DI (Driver Input) signal controls the differential output: DI=HIGH drives A HIGH and B LOW (logic 1); DI=LOW drives A LOW and B HIGH (logic 0). The driver output current is 60mA into a 54-ohm load (27 ohms each side to a 5V termination), producing a differential voltage of at least 1.5V. When DE is LOW, the driver outputs are high-impedance (tri-state), allowing other nodes to transmit. The receiver: When RE# (Receiver Enable) is LOW, the receiver is active. It compares the voltage difference between A and B: if (A-B) > 200mV, RO (Receiver Output) = HIGH; if (A-B) < -200mV, RO = LOW; if |A-B| 200mV differential, preventing false start bits.

Pin Nombre Tipo Función
1 RO Salida Receiver output (HIGH when A-B > 200mV, LOW when A-B < -200mV, Hi-Z when RE#=HIGH)
2 RE# Entrada Receiver enable (active LOW, LOW=receive, HIGH=RO high-impedance)
3 DE Entrada Driver enable (active HIGH, HIGH=transmit, LOW=driver high-impedance)
4 DI Entrada Driver input (TTL/CMOS, HIGH=A-HIGH/B-LOW, LOW=A-LOW/B-HIGH)
5 GND Potencia Suelo
6 A E/S Bus side A (non-inverting, connects to twisted-pair via termination)
7 B E/S Bus side B (inverting, connects to twisted-pair via termination)
8 VCC Potencia Supply (5V, connect with 0.1uF ceramic bypass)
  • Modbus RTU network: Half-duplex RS-485 connects up to 32 PLCs and I/O modules over 1200m twisted-pair; DE/RE# controlled by UART RTS signal for auto-direction switching
  • HVAC building automation: Multiple temperature/humidity sensors communicate to central controller; -7V to +12V common-mode range tolerates ground differences between floors
  • Motor drive communication: Inverter receives speed/torque commands via RS-485 from PLC; 10Mbps data rate supports real-time command updates
  • Point-of-sale terminal: Cash registers networked to central server over long cable runs; ±200mV sensitivity ensures reliable data in noisy retail environments
Fabricante Número de pieza Paquete Notas
Texas Instruments SN75176BDR SOIC-8 Same device in SOIC-8 SMD package
Texas Instruments SP3485EN-L/TR SOP-8 3.3V RS-485, low power, TI/Sipex brand
Dispositivos analógicos ADM485ARZ-REEL7 SOIC-8 5V RS-485, 5Mbps, ADI brand
Maxim MAX485CPA+ DIP-8 5V RS-485, 2.5Mbps, Maxim brand
STMicroelectronics ST485ABDR SOIC-8 5V RS-485, 10Mbps, ST brand
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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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