SP3485 Low Power Half-Duplex RS-485 Transceiver

The SP3485 is a 3.3V powered, half-duplex, low-power RS-485 transceiver that fully meets the requirements of the TIA/EIA-485 standard. The SP3485 includes a driver and a receiver, both of which can be independently enabled and disabled. When both are disabled, both the driver and the receiver output a high-impedance state. The SP3485 has a 1/8 load that allows 256 SP3485 transceivers to be connected to the same communication bus. Error-free data transfer of up to 12Mbps is possible. The SP3485 operates from a voltage range of 3.0 to 3.6V and features fail-safe, over-temperature protection, current limit protection, overvoltage protection, and other functions.

 

SP3485 Pinout Configuration

Pin	Name	Function
1	RO	Receiver output
2	RE	Receiver output enable active LOW
3	DE	Driver output enable active HIGH
4	DI	Driver input
5	GND	Ground connection
6	A	Non-inverting driver output / receiver input
7	B	Inverting driver output / receiver input
8	Vcc	Positive supply

 

Features

• RS-485 and RS-422 transceiver
• Operates from a single 3.3V supply
• Interoperable with 5.0V logic
• Driver/receiver enable
• -7V to +12V common-mode input voltage range
• Allows up to 32 transceivers on the serial bus
• Compatibility with industry-standard 75176 pinout
• Driver output short-circuit protection

Absolute Maximum Ratings

• VCC 6.0V
• Input Voltages
  • Logic -0.3V to 6.0V
  • Drivers -0.3V to 6.0V
  • Receivers ±15V
• Outputs
  • Drivers ±15V
  • Receivers -0.3V to 6.0V
• Storage Temperature -65˚C to 150˚C
• Maximum Junction Temperature, TJ 125˚C
• Power Dissipation 600mW (derate 6.90mW/°C above 70°C)
• ESD Rating Human Body Model (HBM) ±2kV

 

SP3485 Equivalent RS-485 Transceiver ICS

SP3481, UIMAX3485, MAX3485

 

Other RS-485 Transceiver

MAX485, SP485

 

Note: Complete technical details can be found in the SP3485 datasheet at this page’s end.

 

How To Use SP3485?

The SP3485 is a member of the family of 3.3V low-power half-duplex transceivers that meet the electrical specifications of the RS-485 and RS-422 serial protocols. This device is pin-to-pin compatible with the MaxLinear SP481, SP483, and SP485 devices. The image below shows the typical application diagram for the SP3485.

Transmit Function Truth Table

Receive Function Truth Table

 

Applications

• Industrial Communication
• Automotive industry
• Multi-node communication

 

2D Model and Dimensions