Document
SP485R
1/10th Unit Load RS-485 Transceiver
FEATURES • Allows Over 400 Transceivers On A
Transmission Line (1/10th Unit Load) • High Impedance on Receiver Inputs
(RIN = 150kΩ typical) • Half-Duplex Configuration Consistent
With Industry Standard Pinout • -7V to +12V Common Mode Input
Voltage Range • Low Power Consumption (250mW) • Separate Driver and Receiver Enable
DESCRIPTION The SP485R is a pin-to-pin equivalent to our existing SP485 product and offers a high receiver input impedance. The higher receiver input impedance allows for connecting over 400 transceivers on a single transmission line without degrading the RS-485 driver signal. The device is packaged in a 8-pin plastic DIP or 8-pin narrow SOIC.
Figure 1. Typical Application Circuit
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP485R_100_072309
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device at these ratings or any other.