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MAX485CSA+

5V RS-485 transceiver, 2.5Mbps, half-duplex, SOIC-8

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Manufacturer Part：

MAX485CSA+

Package：

8-Pin SOIC Narrow (4.9 x 3.9 x 1.5 mm)

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Description

Product Overview

The MAX485CSA+ is an Analog Devices low-power RS-485/RS-422 transceiver with 5V supply, 2.5Mbps data rate, half-duplex operation, +/-1500V ESD HBM, fail-safe receiver, and up to 32 nodes per bus. Packaged in SOIC-8, 0C to +70C.

Key Specifications

Supply Voltage 5 V single
Data Rate 2.5 Mbps
Topology Half-duplex (1 driver + 1 receiver)
Common Mode Range -7 V to +12 V
Supply Current 120-500 uA
Shutdown Current 0.1 uA typ
ESD Protection +/-1500V HBM
Package SOIC-8 (Narrow)

Features

  • 5V single-supply operation
  • 2.5Mbps data rate (unrestricted driver)
  • Half-duplex RS-485/RS-422 transceiver
  • Up to 32 transceivers on one bus
  • +/-1500V HBM ESD protection
  • Fail-safe receiver (open input = high output)
  • Driver short-circuit current limiting
  • Thermal shutdown protection

Applications

  • Industrial control LANs
  • Low-power RS-485 transceivers
  • Level translators for EMI-sensitive apps
  • Building automation networks

The MAX485CSA+ is an Analog Devices (formerly Maxim Integrated) low-power RS-485/RS-422 transceiver in an 8-pin narrow SOIC package. The device contains one differential driver and one differential receiver, configured for half-duplex communication on a shared RS-485 bus. The 5V single-supply operation and 2.5Mbps maximum data rate make it one of the most widely used RS-485 transceivers for industrial communication. The driver output enables (DE) and receiver output enables (RE) allow independent control of the driver and receiver, enabling half-duplex operation with direction control. The -7V to +12V common-mode input range exceeds the RS-485 specification, providing robustness in noisy industrial environments. The fail-safe receiver feature ensures the receiver output is high when the bus inputs are open (floating), preventing erroneous data reception on unoccupied buses. The driver includes short-circuit current limiting and thermal shutdown protection.

The MAX485CSA+ converts TTL/CMOS logic levels to RS-485 differential signaling. The driver takes single-ended data from the DI (driver input) pin and drives complementary signals on the A and B bus outputs when DE is high. When DI is high, the driver makes A higher than B (differential positive); when DI is low, B is higher than A (differential negative). The receiver senses the differential voltage between A and B when RE is low. If A exceeds B by at least 200mV, the receiver output (RO) is high; if B exceeds A by 200mV, RO is low. The fail-safe feature ensures RO is high when the inputs are open, shorted, or terminated but not driven. For half-duplex operation, the DE and RE pins are typically connected together so that the device is either transmitting (DE=RE=high) or receiving (DE=RE=low). The driver and receiver three-state outputs are in high-impedance when disabled, allowing multiple transceivers to share the bus.

Pin Mnemonic Description
1 RO Receiver output
2 RE Receiver output enable (active low)
3 DE Driver output enable (active high)
4 DI Driver data input
5 GND Ground
6 A Non-inverting receiver input / driver output
7 B Inverting receiver input / driver output
8 VCC +5V supply
  • Industrial Modbus RS-485 network node at 2.5Mbps with fail-safe receiver for open-bus protection
  • Building automation BACnet bus transceiver at 115kbps with +/-1500V ESD for long cable runs
  • Multi-drop sensor network with 32 nodes per bus using half-duplex direction control
  • Arduino/ESP32 RS-485 shield with DE/RE auto-direction control for 2-wire communication
Model Manufacturer Key Difference
MAX485ESA+T ADI Extended temp -40C to +85C
SN65HVD75DR TI RS-485, 12Mbps, SOIC-8
SP3485EN-L/TR MaxLinear RS-485, 3.3V, 10Mbps
THVD1500DR TI RS-485, 5V, 1Mbps, IEC ESD
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