The MAX3316E-MAX3319E are 2.5V powered RS-232 compatible transceivers featuring shutdown (MAX3317E), AutoShutdown Plus (MAX3318E/MAX3319E), and enhanced electrostatic discharge (ESD) protection. All transmitter outputs and receiver inputs are protected to ±15kV using the IEC 1000-4-2 Air-Gap Discharge method, ±8kV using the IEC 1000-4-2 Contact Discharge method, and ±15kV using the Human Body Model. All devices are guaranteed at a data rate of 460kbps. The transceivers have a proprietary low-dropout transmitter output stage enabling RS-232 compatible operation from a +2.25V to +3.0V supply with a dual charge pump. The charge pump requires only four 0.1µF capacitors. The MAX3318E/MAX3319E feature a logic-level output (READY) that asserts when the charge pump is regulating and the device is ready to begin transmitting. The MAX3318E/MAX3319E achieve a 1µA supply current using Maxim's revolutionary AutoShutdown Plus feature. These devices automatically enter a low-power shutdown mode when the RS-232 cable is disconnected or the transmitters of the connected peripherals are inactive for more than 30 seconds. They turn on again when they sense a valid transition at any transmitter or receiver input. AutoShutdown Plus saves power without changes to the existing BIOS or operating system. The MAX3317E also features a 1µA shutdown mode that can be entered by driving SHDN low.
The MAX3316E‑MAX3319E family are 2.5 V powered RS‑232 compatible transceivers with built‑in dual charge‑pump voltage conversion, +15 kV ESD protection and a guaranteed 460 kbps data rate. Variants include shutdown (MAX3317E) and AutoShutdown Plus (MAX3318E/MAX3319E) modes that reduce supply current to 1 A or 1 pA when the cable is disconnected.
The document provides ordering information, pin configurations for SSOP/TSSOP packages, electrical and timing characteristics, typical operating curves, and application circuits. It also describes the READY, INVALID, FORCEON/FORCEOFF control signals and the AutoShutdown Plus behavior for power‑saving operation.
| ESD Protection (Human Body Model) | +15 kV |
|---|---|
| ESD Protection (IEC 1000‑4‑2 Contact Discharge) | +8 kV |
| Operating Supply Current (MAX3318E/MAX3319E, AutoShutdown Plus) | 1 A |
| Shutdown Supply Current (MAX3317E) | <1 pA |
| Guaranteed Data Rate | 460 kbps |
| Operating Supply Voltage | +2.25 V to +3.0 V |
READY goes high when the charge pumps are active and V‑ goes below –2.75 V, indicating the device is ready to transmit.