DIN2

DOUT2

12

8

Powerdown

RIN1

16

20

15

PWRDOWN

ROUT1

DIN1

DOUT1

13

17

RIN2

9

10

ROUT2

1

EN

10

MAX3222

SLLS408H – JANUARY 2000 – REVISED OCTOBER 2016

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8 Detailed Description

8.1 Overview

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. Also, during power down, the onboard charge pump is disabled; V+ is lowered to VCC,

and V

− is raised toward GND. Receiver outputs also can be placed in the high-impedance state by setting EN

high.

8.2 Functional Block Diagram

Figure 7. Logic Diagram (Positive Logic)