1 Features
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 kbps
• Two Drivers and Two Receivers
• 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)
– SNx5C3222

2 Applications
• Battery-Powered Systems
• PDAs
• Notebooks
• Laptops
• Palmtop PCs
• Hand-held Equipment

3 Description
The MAX3222 consists of two line drivers, two line
receivers, 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. The device operates at
data signaling rates up to 250 kbit/s and a maximum
of 30-V/μs driver output slew rate.
The MAX3222 can be placed in the power-down
mode by setting PWRDOWN low, which draws only 1
μA from the power supply. When the device is
powered down, the receivers remain active while the
drivers are placed in the high-impedance state.
Receiver outputs also can be placed in the highimpedance
state by setting EN high.