MAX3233E, MAX3235E ±15kV ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual RS-232 Transceivers with Internal Capacitors

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The MAX3233E/MAX3235E are EIA/TIA-232 and V.28/V.24 communications interfaces with automatic shutdown/wake-up features, high data-rate capabilities, and enhanced electrostatic discharge (ESD) protection. All transmitter outputs and receiver inputs are protected to ±15kV using IEC 1000-4-2 Air-Gap Discharge, to ±8kV using IEC 1000-4-2 Contact Discharge, and to ±15kV using the Human Body Model. The MAX3233E operates from a +3.3V supply; the MAX3235E operates from +5.0V.

All devices achieve a 1µA supply current using Maxim's revolutionary AutoShutdown Plus™ feature. These devices automatically enter a low-power shutdown mode when the following two conditions occur: either the RS-232 cable is disconnected or the transmitters of the connected peripherals are inactive, and the UART driving the transmitter inputs is inactive for more than 30 seconds. They turn on again when they sense a valid transition at any transmitter or receiver input. AutoShutdown Plus saves power without changes to the existing BIOS or operating system.

The MAX3233E/MAX3235E have internal dual charge pumps requiring no external capacitors. Both transceivers have a proprietary low-dropout transmitter output stage that enables true RS-232 performance from a +3.0V to +3.6V supply for the MAX3233E or a +4.5V to +5.5V supply for the MAX3235E. These devices are guaranteed to operate up to 250kbps. Both are available in space-saving 20-pin wide SO or plastic DIP packages.

Key Features

Applications/Uses

ESD Protection for RS-232 I/O Pins
- ±15kV—Human Body Model
- ±8kV—IEC 1000-4-2, Contact Discharge
- ±15kV—IEC 1000-4-2, Air-Gap Discharge
Latchup Free
1µA Supply Current
AutoShutdown Plus-1997 EDN Magazine Innovation of the Year
Single-Supply Operation
- +3.0V to +3.6V (MAX3233E)
- +4.5V to +5.5V (MAX3235E)
250kbps Guaranteed Data Rate
6V/µs Guaranteed Slew Rate
Meets EIA/TIA-232 Specifications Down to 3.0V (MAX3233E)
Internal Charge-Pump Capacitors

	Battery-Powered Applications
	Cell Phones
	Embedded Systems
	Handheld Equipment
	Peripherals
	Subnotebook and Palmtop Computers

Key Specifications: RS-232 Line Driver/Receivers

Part Number

Supply Voltage (V)

Number of Tx

Number of Rx

Data Rate (kbps)

Typ. I_CC Current (mA)

Internal Charge Pump

Number of Ext. Caps

ESD Protection (±kV)

Number of Rx Active in Shutdown

Features

RoHS Available

Package

Smallest Available Package (max w/pins) (mm²)

Operating Temp. Range (°C)

Price^**

MAX3233E

3.3

250

0.3

Yes

•	Auto-Shutdown Plus

•	Internal Capacitors

•	Micropower

•	Three State Rx O/P

•	True RS-232

Yes

PDIP/20
SOIC/20

138

-40 to +85
0 to +70

$3.89 @ 1k

MAX3235E

$3.59 @ 1k

See All RS-232 Line Driver/Receivers (138)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.