The SP3490/3491 are +3.3V low power full duplex transceivers that meet the specifications of the RS-485 and RS-422 serial protocols.
The SP3490 and SP3491 are members of Sipex's low‑power, +3.3 V full‑duplex transceiver family that meet the RS‑485 and RS‑422 specifications. They are pin‑to‑pin compatible with the Sipex SP490/SP491 devices and include driver and receiver tri‑state enable lines on the SP3491.
The datasheet provides absolute maximum ratings, detailed DC and AC electrical characteristics, pin‑out diagrams, package dimensions, and ordering information. Key parameters such as supply voltage, data rate, propagation delays, and short‑circuit currents are listed for designers.
| Supply Voltage | +3.0 to +3.6 V |
|---|---|
| Maximum Data Rate | 10 Mbps |
| Receiver Input‑to‑Output Propagation Delay | 40‑120 ns |
| Input High Voltage | 2.0 V |
| Input Low Voltage | 0.8 V |
| Driver Short‑Circuit Current | 250 mA |
| Receiver Short‑Circuit Current | 60 mA |
| Maximum Number of Devices on Bus | 32 |
The devices operate from a single +3.0 V to +3.6 V supply.
Both the SP3490 and SP3491 support up to 10 Mbps data rate.
Up to 32 transceivers can be placed on the bus.