特性 Features

? Exceeds Requirements of EIA-485 Standard

? Hot Plug Circuitry - Tx and Rx Outputs Remain ThreeState During Power-up/Power-down

? Supply Voltage: 3.0 V ~ 5.5 V

? Data Rate: 500-kbps Isolated RS485

? Full Fail-safe Receiver (Open, Short, Terminated)

? Up to 5-kV RMS Isolation Rating

? ±200-kV/μs typ Static CMTI, ±150-kV/μs typ Dynamic

CMTI

? Latch-up Performance Exceeds 600 mA

? Bus-Pin Protection (Between Bus pins and GNDB)

– ±15-kV IEC 61000-4-2 Contact Discharge

– ±20-kV IEC 61000-4-2 Air Discharge

? Safety-Related Certifications:

– VDE Certification according to DIN VDE V

0884-17(IEC60747-17)

– 5000-VRMSIsolation Rating per UL 1577

– CQC Certification per GB 4943.1

– CSA, TUV, and CB Certifications

Applications

? Home Appliance

? Motor Drives

? Industrial Control

? Communication Infrastructure

描述 Description

The TPT7487 is a ±15-kV IEC61000 ESD protected, 3.0-V

~ 5.5-V isolated RS485 transceivers that meet the RS-485

and RS-422 standards for Half Duplex communication.

The TPT7488 is isolated Full Duplex RS485.

The TPT748x features a fail-safe receiver, which supports

the output of the receiver to be logic high when the

differential input (bus pin A/B) of the receiver is open,

short, or idle.

Transmitters in this family deliver exceptional differential

output voltages into the RS-485 required 54-Ω load. The

500-kbps device has very low bus currents, so they

present a true “1/8 unit load” to the RS-485 bus. This

allows up to 256 transceivers on the network without using

repeaters. Receiver (Rx) inputs feature a “Full Fail-Safe”

design, which ensures a logic-high Rx output if Rx inputs

are floating, shorted, or on a terminated but undriven bus.

The TPT748x is available in the WSOP16 package and is

characterized from ?40°C to +125°C