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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 V

CC

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-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 kbps and a maximum of

30-V/μs driver output slew rate.

Flexible control options for power management

are available when the serial port is inactive.

The automatic power-down feature functions when

FORCEON is low and FORCEOFF is high. During

this mode of operation, if the device does not sense a

valid

RS-232 signal on the receiver input, the driver output

is disabled and the supply current is reduced to 1 μA.

The INVALID output notifies the user if an RS-232

signal is present at the receiver input.

Device Information

PART NUMBERPACKAGE

(1)

BODY SIZE (NOM)

MAX3221

SSOP (DB) (32)6.20 mm × 5.30 mm

TSSOP (PW) (32)5.00 mm × 4.40 mm

(1)For all available packages, see the orderable addendum at

the end of the data sheet.

spacer

RX

TX

POWER

APD

EN[RX]

DIN

ROUT

DOUT

RS232

RIN

RS232

11

11

FORCEON

FORCEOFF

STATUS

INVALID

3.3V,5V

Simplified Diagram

MAX3221

SLLS348P – JUNE 1999 – REVISED JULY 2021

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Produktspecifikationer