Texas Instruments MAX3223E Bedienungsanleitung

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3-V to 5.5-V Multichannel RS-232 Line Driver and Receiver with ±15-kV ESD

Protection

1 Features

•ESD Protection for RS-232 bus pins

–±15-kV Human-body model (HBM)

–±8-kV IEC61000-4-2, Contact discharge

–±15-kV IEC61000-4-2, Air-gap discharge

•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 500 kbit/s

•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 Mbit/s) for SNx5C3223E

2 Applications

•Battery-powered systems

•PDAs

•Notebooks

•Laptops

•Palmtop PCs

•Hand-held equipment

DB, DW, OR PW PACKAGE

(TOPVIEW)

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

EN

C1+

V+

C1−

C2+

C2−

V−

DOUT2

RIN2

ROUT2

FORCEOFF

V

CC

GND

DOUT1

RIN1

ROUT1

FORCEON

DIN1

DIN2

INVALID

3 Description

The MAX3223E 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

typical data signaling rates up to 500 kbit/s 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 auto-

powerdown 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, the driver outputs are disabled. If FORCEOFF

is set low and EN is high, both drivers and receivers

are shut off, and the supply current is reduced to 1

mA. Disconnecting the serial port or turning off the

peripheral drivers causes auto-powerdown to occur.

Auto-powerdown can be disabled when FORCEON

and FORCEOFF are high. With auto-powerdown

enabled, the device is activated automatically when

a valid signal is applied to any receiver input. The

INVALID output is used to notify the user if an RS-232

signal is present at any receiver input. INVALID is

high (valid data) if any receiver input voltage is greater

than 2.7 V or less than –2.7 V, or has been between

–0.3 V and 0.3 V for less than 30 μs. INVALID is low

(invalid data) if the receiver input voltage is between

–0.3 V and 0.3 V for more than 30 μs. Refer to Figure

5-4 for receiver input levels.

Package Information

PART NUMBERPACKAGE

(1)

PACKAGE SIZE

(2)

MAX3223E

SOIC (DW, 20)12.8 mm × 10.3 mm

SSOP (DB, 20)7.2 mm × 7.8 mm

TSSOP (PW, 20)6.5 mm x 6.4 mm

(1)For more information, see Section 10.

(2)The package size (length × width) is a nominal value and

includes pins, where applicable.

MAX3223E

SLLS707B – JANUARY 2006 – REVISED DECEMBER 2023

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.

Produktspezifikationen