The MAX3460-MAX3464 are high-speed differential bus transceivers for RS-485 and RS-422 communications. They are designed to meet TIA/EIA-422-B, TIA/EIA-485-A, V.11, and X.27 standards. The transceivers comply with the Profibus specification providing +2.1V output level with a 54Ω load, 20Mbps data rate, and output skew less than 2ns. Each transceiver contains one three-state differential line driver and one differential input line receiver. The devices operate from a +5V supply and feature true fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open or shorted. This enables all receiver outputs on a terminated bus to output logic highs when all transmitters are disabled. All devices feature a 1/4 standard unit load receiver input impedance that allows 128 transceivers on the bus. Driver and receiver propagation delays are guaranteed under 20ns for multidrop, clock distribution applications. Drivers are short-circuit current limited and are protected against excessive power dissipation by thermal shutdown circuitry. The driver and receiver feature active-high and active-low enables, respectively, that can be connected together externally to serve as a direction control.
The MAX3460–MAX3464 family are high‑speed differential bus transceivers designed for RS‑485 and RS‑422 communication. They meet TIA/EIA‑422‑B, TIA/EIA‑485‑A, V.11 and X.27 standards and are compatible with Profibus applications, offering a guaranteed 20 Mbps data rate and true fail‑safe operation.
The devices operate from a single +5 V supply, provide a +2.1 V differential output on a 54 Ω load, and support up to 128 transceivers on a bus. Features include hot‑swap capability, low‑power shutdown (≈1 µA), and built‑in current‑limiting and thermal shutdown protection.
| Supply Voltage (VCC) | 4.75 V to 5.25 V |
|---|---|
| Maximum Data Rate | 20 Mbps |
| Driver/Receiver Propagation Delay | ≤20 ns |
| Differential Output Level | 2.1 V on 54 Ω load |
| Low‑Power Shutdown Current | 1 µA |
The transceivers support up to 20 Mbps data rate.
Up to 128 transceivers can be connected in parallel on one communication line.
Operating temperature ranges from –40 °C to +85 °C depending on the package.
In low‑power shutdown mode the devices draw about 1 µA of supply current.