UM3085EESA具有IEC ESD保护的低功耗,增强型驱动器,半双工RS485收发器

分类:产品动态 时间:2020-05-15

Key Specifications

Part Number

Description

Status

Supply Voltage(Nom)(V)

No. of TX

No. of RX

Duplex

Signaling Rate(Max)(Mbps)

ESD Contact (kV)

ESD Air (kV)

Number of Nodes

Common Mode Range(V)

Fail Safe

ICC(Max) (mA)

Operating Temperature Range()

Pin/Package

EV Kit Available?

UM3085EESA

具有IEC ESD保护的低功耗,增强型驱动器,半双工RS485收发器

Active

5

1

1

Half

0.5

±8

±15

256

-7 to 12

Idle, Open, Short

0.7

-40 to 85

8/SOP

Y

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Product Description

 

The UM3085EESA are ±15kV ESD-protected, high-speed transceivers for RS-485 communication that contain one driver and one receiver. These devices feature fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open, shorted or idle. This means that the receiver output will be logic high if all transmitters on a terminated bus are disabled (high impedance). The UM3085E features reduced slew-rate driver that minimizes EMI and reduces reflections caused by improperly terminated cables, allowing error-free data transmission up to 500kbps. The devices feature enhanced ESD protection. All transmitter outputs and receiver inputs are protected to ±15kV using the Human Body Model and IEC61000-4-2, Air-Gap Discharge.

The transceivers typically draw 400μA of supply current when unloaded, or when fully loaded with the drivers disabled. All devices have a 1/8-unit-load receiver input impedance that allows up to 256 transceivers on the bus and are intended for half-duplex communications.

 

Features

 

- ESD Protection for RS-485 I/O Pins

  ±15kV—Human Body Model

  ±15kV—IEC61000-4-2, Air-Gap Discharge

- True Fail-Safe Receiver while Maintaining EIA/TIA-485 Compatibility

- Enhanced Slew-Rate Limiting Facilitates Error-Free Data Transmission

- 2nA Low-Current Shutdown Mode

- -7V to +12V Common-Mode Input Voltage Range

- Allows up to 256 Transceivers on the Bus

- Thermal Shutdown

- Current-Limiting for Driver Overload Protection

  

Typical Operating Circuits



 

Applications

 

- RS-485 Transceivers

- Level Translators

- Industrial-Control Local Area Networks

- Transceivers for EMI-Sensitive Applications

 

Communication Function Table

 

Table1. Transmitting                       

INPUTS

OUTPUTS

MODE

RE(______)

DE

DI

B

A

X

1

1

0

1

Normal

X

1

0

1

0

Normal

0

0

X

High-Z

High-Z

Normal

1

0

X

High-Z

High-Z

Shutdown

X=Don’t care; High-Z=High Impedance

 

Table2. Receiving

INPUTS

OUTPUTS

MODE

RE(______)

DE

A, B

RO

0

X

>-50mV

1

Normal

0

X

<-200mV

0

Normal

0

X

Inputs Open

1

Normal

1

0

X

High-Z

Shutdown

X=Don’t care; High-Z=High Impedance

 

Ordering Information

 

Part Number

Operating Temperature

Mark Code

Package Type

UM3085EESA

-40°C to +85°C

UM3085EESA

SOP8