ST485CDR

Product Overview

The ST485CDR from STMicroelectronics is a surface-mount half-duplex RS422 and RS485 transceiver in an 8-SOIC package. It integrates one driver and one receiver for differential serial communication, with a specified data rate of 2.5 Mbps and a 70 mV receiver hysteresis. The device operates from a 4.75 V to 5.25 V supply and is rated for an operating temperature range of 0°C to 70°C. Its 3.90 mm wide SOIC footprint supports surface-mount board layouts where a single-channel RS485 or RS422 interface is required.

Key Features

• Half-duplex RS422 and RS485 transceiver with 1/1 driver/receiver configuration.
• Specified 2.5 Mbps data rate for differential serial signaling.
• 70 mV receiver hysteresis.
• 4.75 V to 5.25 V supply voltage range.
• Surface-mount 8-SOIC package with 0.154 in (3.90 mm) width.
• 0°C to 70°C operating temperature range.

Applications

• Half-duplex serial communication between a controller and a serial device.
• Differential RS422 or RS485 data links using a single transceiver channel.
• Serial bus interfaces in surface-mount assemblies operating from a 4.75 V to 5.25 V supply.

Design & Procurement Notes

Designers should verify that the system supply remains within 4.75 V to 5.25 V and that the operating temperature stays within 0°C to 70°C. Because the device is half-duplex with one driver and one receiver, the communication architecture should avoid simultaneous transmit and receive on the same channel. The 8-SOIC surface-mount package requires a footprint compatible with 0.154 in (3.90 mm) width, and the 2.5 Mbps data rate and 70 mV receiver hysteresis should be checked against the differential bus loading, termination, and signal integrity requirements of the intended RS422 or RS485 link.