The MAX3293/MAX3294/MAX3295 low-power, high-speed transmitters for RS-485/RS-422 communication operate from a single +3.3V power supply. These devices contain one differential transmitter. The MAX3295 transmitter operates at data rates up to 20Mbps, with an output skew of less than 5ns, and a guaranteed driver propagation delay below 25ns. The MAX3293 (250kbps) and MAX3294 (2.5Mbps) are slew-rate limited to minimize EMI and reduce reflections caused by improperly terminated cables. The MAX3293/MAX3294/MAX3295 output level is guaranteed at +1.5V with a standard 54Ω load, compliant with RS-485 specifications. The transmitter draws 5mA of supply current when unloaded, and 1µA in low-power shutdown mode (DE = GND). Hot-swap circuitry eliminates false transitions on the data cable during circuit initialization or connection to a live backplane, and short-circuit current limiting and thermal-shutdown circuitry protect the driver against excessive power dissipation. The MAX3293/MAX3294/MAX3295 are offered in a 6-pin SOT23 package, and are specified over the automotive temperature range.
The MAX3293, MAX3294 and MAX3295 are low‑power, high‑speed transmitters for RS‑485/RS‑422 communication that operate from a single +3.3 V supply. They provide differential driver outputs, hot‑swap capability, and protection against short‑circuit and thermal overload. The devices are offered in a 6‑pin SOT‑23 package and are qualified for automotive temperature ranges.
The datasheet includes absolute maximum ratings, electrical characteristics, switching performance, typical operating curves, pin descriptions, and layout guidelines. It also details the hot‑swap input structure, EMI reduction techniques, and package dimensions.
| Data Rate | 250 kbps (MAX3293), 2.5 Mbps (MAX3294), 20 Mbps (MAX3295) |
|---|---|
| Supply Voltage (VCC) | 3.135 V – 3.465 V |
| Common‑Mode Input Voltage Range | -7 V to +12 V |
| Propagation Delay | < 25 ns |
| Output Skew | < 5 ns |
| Operating Temperature Range | -40 °C to +125 °C |
The MAX3295 operates at data rates up to 20 Mbps.
The transmitters are qualified for an automotive temperature range of –40 °C to +125 °C.
Driving the DE (Driver Enable) pin high enables the driver; pulling DE low places the outputs in a high‑impedance shutdown state.