Multiprotocol transceivers are very useful for projects that require RS-232, RS-485, and RS-422 serial standards. They help reduce the workload for software teams.
There are many transceivers available in the market, and one of them is described below.
The MAX3161/MAX3162 are programmable RS-232/RS-485/RS-422 multiprotocol transceivers. The MAX3161 can be pin-programmed as a 2TX/2RX RS-232 interface or a single RS-485/RS-422 transceiver.
The MAX3162 is configured as a 2TX/2RX RS-232 interface and a single RS-485/RS-422 transceiver simultaneously. Both devices incorporate a proprietary low-dropout transmitter output stage and an onboard dual charge pump, allowing RS-232 and RS-485/RS-422 compliant performance from a single supply.
These devices also feature pin-selectable transmitter slew rates for both RS-232 and RS-485/RS-422 modes. Slew-rate limiting minimizes EMI and reduces reflections caused by improperly terminated cables, allowing error-free data transmission up to 250kbps.
Disabling slew-rate limiting allows these devices to transmit at data rates up to 10Mbps in RS-485/RS-422 mode and up to 1Mbps in RS-232 mode. The MAX3161/MAX3162 offer a flow-through pinout that facilitates board layout. They are available in tiny SSOP packages and operate from -40°C to +85°C.
