MAX3221
SLLS348P – JUNE 1999 – REVISED JULY 2021
MAX3221 3-V to 5.5-V RS-232 Line Driver and Receiver With ±15-kV ESD Pr...
MAX3221
SLLS348P – JUNE 1999 – REVISED JULY 2021
MAX3221 3-V to 5.5-V RS-232 Line Driver and Receiver With ±15-kV ESD Protection
1 Features
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 kbps One driver and one receiver Low standby current: 1 μA typical External
capacitors: 4 × 0.1 μF Accepts 5-V logic input with 3.3-V supply Alternative high-speed pin-compatible
device (1 Mbps)
– SNx5C3221 Automatic power-down feature automatically
disables drivers for power savings
2 Applications
Industrial PCs Wired networking Data center and enterprise computing Battery-powered systems PDAs Notebooks Laptops Palmtop PCs Hand-held equipment
3 Description
The MAX3221 device consists of one line driver, one line receiver with dedicated enable pin, 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-232F 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 kbps and a maximum of 30-V/μs driver output slew rate.
Flexible control options for power management are available wh...