MC33990D

Drivers, Receivers, Transceivers

The MC33990D is a family of RS-485 transceivers designed for applications where reliable serial communication at high data rates is essential. The MC33990D transceivers are suitable for use in industrial, commercial and automotive systems.

Overview

The MC33990D family of RS-485 transceivers is an optimized solution for high speed, reliable communication. It is designed to drive and receive data up to 3.125 Mbps in full duplex mode and operates over a single differential pair pin-out. The transceiver features a full-duplex, non-directional transceiver port, enabling two transceivers to communicate bi-directionally without the need for additional circuitry. It also has a configurable output drive for up to four transceiver pairs, allowing for up to a 32-bit wide data bus. Additionally, the on-chip termination resistors and slew rate control enables communications over long transmission lines.

Features

The MC33990D family of transceivers offers a wide range of features for high-speed, reliable data transmission. These include a programmable high input impedance, swappable ports for high-speed signaling, data line fault detection and optional spread spectrum clocking to minimize emissions and peak power. The device also includes a built-in flag on the output port and provides high level of protection against damage due to electrostatic discharge and transients.

Applications

The MC33990D is most suitable for applications requiring reliable serial communication at high data rates. This includes industrial, commercial and automotive systems, as well as applications in medical, test and measurement, and communications equipment. It is also ideally suited for any system that requires both fast serial communication and high levels of isolation. Examples include communication networks, remote data acquisition, as well as vehicle-to-vehicle communication systems.

Working Principle

The MC33990D is a full-duplex, non-directional transceiver designed for high-speed, reliable data transmission. It is typically used for point-to-point communication and operates over a single differential pair, with two transceivers talking to each other bi-directionally. The device features two on-chip termination resistors and slew rate control, allowing communications over long transmission lines. The on-chip flag simplifies system design and error checking by enabling the slave device to check for proper device functioning before responding. Additionally, the MC33990D family of transceivers includes a spread-spectrum clocking option, which can help minimize peak power and reduce EMI/RFI emissions.