FEATURES
Meets or Exceeds the Requirements of
TIA/EIA-232-F and ITU v.28 Standards
Operates With 3-V to 5.5-V VCC Supply
Operates at Least 1 Mbit/s
Low Standby Current . . . 1 mA Typ
External Capacitors . . . 4 ´ 0.1 mF
Accepts 5-V Logic Input With 3.3-V Supply
Designed to Be Interchangeable With Maxim™
MAX3227
Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
ESD Protection for RS-232 I/O Pins
– ±15 kV – Human-Body Model
– ±8 kV – IEC61000-4-2, Contact Discharge
– ±8 kV – IEC61000-4-2, Air-Gap Discharge
Auto-Powerdown Plus Feature Automatically
Disables Drivers for Power Savings
Packaged in Plastic Shrink Small-Outline
Package

APPLICATIONS
Battery-Powered, Hand-Held, and Portable
Equipment
PDAs and Palmtop PCs
Notebooks, Sub-Notebooks, and Laptops
Digital Cameras
Mobile Phones and Wireless Devices

DESCRIPTION/ORDERING INFORMATION
The MAX3227 consists of one line driver, one line receiver, and a dual charge-pump circuit with ±15-kV ESD
protection pin to pin (serial-port connection pins, including GND). The device meets the requirements of
TIA/EIA-232-F and provides the electrical interface between an asynchronous communication controller and the
serial-port connector. The charge pump and four small external capacitors allow operation from a single 3-V to
5.5-V supply. This device operates at data-signaling rates of 1 Mbit/s in normal operating mode and a maximum
of 30-V/ms driver output slew rate. This device also features a logic-level output (READY) that asserts when the
charge pump is regulating and the device is ready to begin transmitting.
The MAX3227 achieves a 1-mA supply current using the auto-powerdown plus feature. This device automatically
enters a low-power powerdown mode when the RS-232 cable is disconnected or the drivers of the connected
peripherals are inactive for more than 30 s. They turn on again when they sense a valid transition at any driver or
receiver input. Auto-powerdown saves power without changes to the existing BIOS or operating system.
The MAX3227C is characterized for operation from 0°C to 70°C. The MAX3227I is characterized for operation
from –40°C to 85°C.