The MAX3465–MAX3469 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 transceiver complies with the Profibus specification providing +2.1V minimum output level with a 54Ω load, 40Mbps data rate, and output skew less than 2ns. Each part 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 MAX3465‑MAX3469 family are high‑speed differential bus transceivers for RS‑485 and RS‑422 communications. They operate from a +5 V supply, provide true fail‑safe circuitry, and support up to 40 Mbps data rates, making them suitable for Profibus and other industrial‑control LANs.
The devices include a three‑state driver, a differential receiver, and optional hot‑swap versions. They can be used in full‑duplex or half‑duplex configurations, allow up to 128 transceivers on a single bus, and feature built‑in current limiting and thermal shutdown protection.
| Supply Voltage (VCC) | 4.75 V to 5.25 V |
|---|---|
| Maximum Data Rate | 40 Mbps |
| Driver Propagation Delay | 15 ns (typical) |
| Shutdown Supply Current | 1 µA |
| Maximum Bus Load | Up to 128 transceivers |
The devices operate from a supply voltage of 4.75 V to 5.25 V.
They support data rates up to 40 Mbps.
Up to 128 transceivers can be connected to the same bus.
The typical driver propagation delay is 15 ns.