Texas Instruments DS8921ATM/NOPB, full-duplex RS-485/RS-422 transceiver, 1 driver / 1 receiver, 8-SOIC package, 4.5V to 5.5V supply, -40°C to 85°C operation.
| Parameter | Value |
|---|---|
| Type | Transceiver |
| Mounting | Surface Mount |
| Supply voltage | 4.5V ~ 5.5V |
| Protocol | RS422, RS485 |
| Operating temperature | -40°C ~ 85°C |
| Duplex | Full |
| Package | Tube |
| Case | 8-SOIC (0.154\", 3.90mm Width) |
| Receiver hysteresis | 70 mV |
| Number of drivers (Receivers) | 1/1 |
The DS8921ATM/NOPB is a full-duplex transceiver supporting both RS-422 and RS-485 protocols.
It is not designed for 3.3V logic — the receiver hysteresis of 70 mV is specified at 5V nominal. If your system runs on a 3.3V bus, you will need a level translator or a different transceiver rated for that supply.
The DS8921ATM/NOPB is supplied in a tube, while the DS8921ATMX/NOPB is typically supplied on tape-and-reel. Electrically they are identical — same transceiver, same 8-SOIC package, same ratings. Choose the tube variant for prototype or low-volume builds; pick the reel variant for automated pick-and-place assembly.