FEATURES
· Controlled Baseline
– One Assembly/Test Site, One Fabrication
Site
· Extended Temperature Performance of –55°C
to 125°C
· Enhanced Diminishing Manufacturing
Sources (DMS) Support
· Enhanced Product-Change Notification
· Qualification Pedigree (1)
· RS-232 Bus-Pin ESD Protection Exceeds
±15 kV Using Human-Body Model (HBM)
· 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 up to 250 kbit/s
· One Driver and One Receiver
· Low Standby Current . . . 1 mA Typical
· External Capacitors . . . 4 ´ 0.1 mF
· Accepts 5-V Logic Input With 3.3-V Supply
· Alternative High-Speed Pin-Compatible
Device (1 Mbit/s)
– SNx5C3221
· Auto-Powerdown Feature Automatically
Disables Drivers for Power Savings

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

DESCRIPTION/ORDERING INFORMATION
The MAX3221 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. These devices operate at data signaling rates up to 250 kbit/s and a maximum of 30-V/ms driver
output slew rate.