The MAX3316E–MAX3319E are 2.5V powered RS-232 compatible transceivers. These devices feature shut- down (MAX3317E), AutoShutdown Plus™ (MAX3318E/ MAX3319E), and enhanced electrostatic discharge (ESD) protection integrated into the chip. 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 trans- mitter output stage enabling RS-232 compatible opera- tion 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 shut- down 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 MAX3317E’s receivers r
The MAX3316E–MAX3319E family are 2.5 V powered RS‑232 compatible transceivers featuring shutdown (MAX3317E), AutoShutdown Plus™ (MAX3318E/MAX3319E), and enhanced ESD protection. They operate over a supply range of +2.25 V to +3.0 V, guarantee a 460 kbps data rate, and include a dual charge‑pump that requires only four 0.1 µF capacitors.
Available in compact SSOP and TSSOP packages, the devices support a wide range of applications such as handheld computers, pagers, and GPS terminals. Key functional blocks include inverting transmitters, active‑low receivers, a READY logic‑level output, and an INVALID signal for detecting the absence of valid RS‑232 levels. The family also offers a low‑power shutdown mode with supply current below 1 µA while keeping receivers active.
| Supply Voltage Range | +2.25 V to +3.0 V |
|---|---|
| Maximum Data Rate | 460 kbps |
| ESD Protection (Human Body Model) | ±15 kV |
| Shutdown Supply Current | < 1 µA |
| Slew Rate | 4 V/µs |
The devices are guaranteed to operate at a data rate of 460 kbps.
In shutdown mode the supply current drops to less than 1 µA while the receivers remain active.
READY goes high when the charge pump is regulating and the device is ready to transmit; it is low when the charge pumps are disabled in shutdown mode.
MAX3316E is offered in 16‑pin SSOP and 20‑pin TSSOP; MAX3317E/MAX3318E in 20‑pin SSOP and 20‑pin TSSOP; MAX3319E in 16‑pin SSOP.