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BL3085B

BELLING
Part Number BL3085B
Manufacturer BELLING
Description RS-485 Transceivers
Published Mar 2, 2016
Detailed Description BL3085B High ESD-Protected, Fail-Safe, Slew-Rate-Limited RS-485 Transceivers General Description The BL3085B is a half-d...
Datasheet PDF File BL3085B PDF File

BL3085B
BL3085B

Overview
BL3085B High ESD-Protected, Fail-Safe, Slew-Rate-Limited RS-485 Transceivers General Description The BL3085B is a half-duplex RS-485 transceiver with ±18kV IEC 61000-4-2 contact discharge protection.
The BL3085B contains one driver and one receiver.
The device features fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open or shorted.
This means that the receiver output will be logic high even if all transmitters on a terminated bus are disabled.
The BL3085B features reduced slew-rate driver that minimizes EMI and reduces reflections caused by improperly terminated cables, allowing error-free data transmission up to 250kbps.
The BL3085B has a 1/8 unit load receiver input impedance that allows up to 256 transceivers on the bus.
Configuration Functional Block of BL3085B Applications RS-485 Communications Level Translators Transceivers for EMI-Sensitive Applications Industrial Control Local Area Networks Energy Meter Networks Lighting Systems Page- 1 - www.
belling.
com.
cn V1.
2 BL3085B Pin Function Description Pin Number 1 Name RO Receiver Output.
Function Receiver Output Enable.
/RE is low to enable the Receiver; /RE is high 2 /RE to disable the Receiver.
Driver Output Enable: DE is high to enable the Driver; DE is low to 3 DE disable the Driver.
4 DI Driver Input 5 GND Ground.
6 A Non-inverting Receiver Input and Non-inverting Driver Output.
7 B Inverting Receiver Input and Inverting Driver Output.
8 VCC Power Supply.
Function Table Transmitting Inputs Outputs /RE DE DI B A X1 1 0 1 X1 0 1 0 0 0 X High-Z High-Z 10 X Shutdown Inputs /RE DE 0X 0X 0X 11 10 Receiving Outputs A-B RO ≥-0.
05V 1 ≤-0.
2V 0 Open/shorted 1 X High-Z X Shutdown Page2 www.
belling.
com.
cn V1.
2 Absolute Maximum Ratings Parameter Power Supply Control Input Voltage Transmitter Input Voltage Transmitter Output Voltage Receiver Input Voltage Receiver Output Voltage Operating Temperature Symbol VCC /RE, DE DI A, B A,...


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