BL3085A(H)

BL3085A(H) High ESD-Protected, Fail-Safe, Slew-Rate-Limited RS-485 Transceivers General Description The BL3085A(H) is a half-duplex RS-485 transceiver with ±15kV IEC 61000-4-2 contact ESD protection. This device contains one driver and one receiver. The BL3085A(H) includes 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 BL3085A(H) 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 BL3085A(H) has a 1/8 unit load receiver input impedance that allows up to 256 transceivers on the bus. Features Functional Block ➢ ➢ ➢ ➢ ➢ +3.3V or +5V Operation True Fail-Safe Receiver Maximum Data Rate: 250kbps Allow Up to 256 Transceivers on the Bus I/O Pins ESD Protection: ±15kV IEC 61000-4-2, contact Discharge ➢ Available in SOP8 Package Applications ➢ ➢ ➢ ➢ ➢ ➢ RS-485 Communications Level Translators Transceivers for EMI-Sensitive Applications Industrial Control Local Area Networks Energy Meter Networks Lighting Systems www.belling.com.cn Page- 1 - V1.3 BL3085A(H) Ordering Information Part Number Package Marking BL3085A(H) SOP8 BL3085A I47SSSSS “SSSSS” : Product Trace Code Pin Function Description Pin Number Name 1 RO Receiver Output. 2 /RE Receiver Output Enable. /RE is low to enable the Receiver; /RE is high to disable the Receiver. 3 DE Driver Output Enable. DE is high to enable the Driver; DE is low to disable the Driver. 4 DI Driver Input 5 GND 6 A Non-inverting Receiver Input and Non-inverting Driver Output. 7 B Inverting Receiver Input and Inverting Driver Output. 8 VCC Function Ground. Power Supply. Function Table (Transmitting) Inputs Outputs /RE DE DI A B X 1 1 1 0 X 1 0 0 1 0 0 X High-Z High-Z 1 0 X www.belling.com.cn Shutdown（High-Z） Page 2 V1.3 BL3085A(H) Function Table (Receiving) Inputs Outputs /RE DE A-B RO 0 X >-50mV 1 0 X