MAX3228, MAX3229 +2.5V to +5.5V RS-232 Tranceivers in UCSP

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The MAX3228/MAX3229 are +2.5V to +5.5V powered EIA/TIA-232 and V.28/V.24 communications interfaces with low power requirements, and high data-rate capabilities, in a chip-scale package (UCSP™).

The MAX3228/MAX3229 achieve a 1µA supply current with Maxim's AutoShutdown™ feature. They save power without changes to existing BIOS or operating systems by entering low-power shutdown mode when the RS-232 cable is disconnected, or when the transmitters of the connected peripherals are off.

The transceivers have a proprietary low-dropout transmitter output stage, delivering RS-232 compliant performance from a +3.1V to +5.5V supply, and RS-232 compatible performance with a supply voltage as low as +2.5V. The dual charge pump requires only four small 0.1µF capacitors for operation from a +3.0V supply. Each device is guaranteed to run at data rates of 250kbps while maintaining RS-232 output levels.

The MAX3228/MAX3229 offer a separate power-supply input for the logic interface, allowing configurable logic levels on the receiver outputs and transmitter inputs. Operating over a +1.65V to V_CC range, V_L provides the MAX3228/MAX3229 compatibility with multiple logic families.

The MAX3229 contains one receiver and one transmitter. The MAX3228 contains two receivers and two transmitters. The MAX3228/MAX3229 are available in tiny chip-scale packaging and are specified across the extended industrial temperature range of -40°C to +85°C.

Key Features

Applications/Uses

6 x 5 Chip-Scale Packaging (UCSP)
1µA Low-Power AutoShutdown
250kbps Guaranteed Data Rate
Meets EIA/TIA-232 Specifications Down to +3.1V
RS-232 Compatible to +2.5V Allows Operation from Single Li+ Cell
Small 0.1µF Capacitors
Configurable Logic Levels

	Cell Phones
	Cellular Data Cables
	Handheld Devices
	PDAs and Other Handheld Devices
	Set-Top Boxes

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

Nom. Cap. Value (µF)

Number of Rx Active in Shutdown

Features

RoHS Available

Package

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

Operating Temp. Range (°C)

Price^**

MAX3228

2.5
3
3.3
5

250

0.3

Yes

0.1

•	Auto-Shutdown

•	Low Voltage Logic Compatibility (VL)

•	Micropower

•	Mixed Logic Voltage

•

Shutdown

•	Signal-Invalid O/P

•	Three State Rx O/P

•	Three State Tx

•	True RS-232

Yes

UCSP/20

-40 to +85

$2.40 @ 1k

MAX3229

$1.80 @ 1k

See All RS-232 Line Driver/Receivers (145)

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.