Low Power 5V 10Mbps 256-Fanout RS485 Transceivers (Features 10/14-pin)

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The ZT485H series devices are 5V differential data line transceivers for RS485/RS422 communication that consist of one driver and one receiver with high level of ESD protection. They are designed for balanced transmission lines interface that meet ANSI standard TIA/EIA-485-A and ISO 8482:1987(E) specifications.

The ZT485H series devices spans out with half or full duplex, data rate guaranteed at 250K bit per second or 10Mbps, and allow one-eighth of an unit load that fan out 256 devices sharing a common bus. The I/Os are enhanced-electrostatic discharge (ESD) protected, exceeding ±15kV Human Body Model (HBM).


● Meets or exceeds the requirements of ANSI Standard TIA/EIA-485-A and ISO 8482:1987(E) specifications for V cc at +5V ±10%
● Low quiescent current – 0.5mA typ., 1mA max
● Low shutdown current (where applicable) - 1μA typical, 10μA max
● Guaranteed standard data rate 250Kbps or 10Mbps
● True Fail-Safe (Open, Short, Bus Idle) Receiver
● -7V to +12V common-mode input voltage range
● Half-Duplex mode configuration
● Allows up to 1/8 unit load (256 devices) on the same common bus
● Controlled driver output slew rate and receiver input filtering
● Active-high driver enable and active-low receiver Enable
● ESD protection on bus terminals
-- ±15kV Human Body Model (HBM)
● Alternative replacement for MAX308x, MAX1308x, SN75HVD308x, SN65HVD308x
● Standard fanout driving 1 unit load (32 devices) on the ZT485E Series

Target Applications

Utility meters
Industrial process control
Building automation
Level translators
Transceivers for EMI-sensitive applications
Routers and HUBs
Industrial-controlled Local Area Networks
Industrial PCs, embedded PCs and peripherals
Industrial, security CATV and camera applications



Technical Documentation

Product Brief, Product Introduction and Datasheet

ZT491H Product Brief

Release Date

File Size
327.8 KB

ZT491H Datasheet


Release Date

File Size
2.1 MB