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Data Sheet

FULL DATA SHEET (PDF, 248kB) Download   E-Mail

Description

The MAX3238E/MAX3248E transceivers use Maxim's revolutionary AutoShutdown Plus™ feature to achieve 10nA supply current. These devices shut down the on-board power supply and drivers when they do not sense a valid signal transition on either the receiver or transmitter inputs. This occurs if the RS-232 cable is disconnected or if the transmitters of the connected peripheral are turned off. The devices turn on again when a valid transition is applied to any RS-232 receiver or transmitter input. AutoShutdown Plus automatically achieves this power savings through its on-board circuitry, as no changes are required to the existing BIOS or operating system. All RS-232 inputs and outputs, as well as the logic I/O pins, have enhanced ESD protection to ±15kV. The additional ESD protection on the logic I/O pins makes the MAX3238E/MAX3248E ideal for cell phone data cable applications because it eliminates the need for costly external TransZorb™ or protection schemes. The MAX3238E/MAX3248E contain five drivers and three receivers and are 3V-powered EIA/TIA-232 and V.28/V.24 communication interfaces intended for cell phones, data cables, and modem applications. A proprietary, high-efficiency, dual charge-pump power supply and a low-dropout transmitter combine to deliver true RS-232 performance from a single +3.0V to +5.5V supply. A guaranteed data rate of 250kbps provides compatibility with popular software for communicating with personal computers. The MAX3238E and the MAX3248E differ only in their input logic thresholds. The MAX3238E has standard logic thresholds, while the MAX3248E has low-level logic thresholds of 0.6V to 1.2V, which are ideal for 1.8V systems. The transmitter inputs, FORCEON, and active-low FORCEOFF have a 400 kilohms active positive feedback resistor. Once driven to a valid logic level, they will retain this level if the driving signal is removed or goes high impedance. Unused transmitter and logic inputs may be left unconnected. The MAX3238E/MAX3248E can operate with supply voltages ranging from +3.0V to +5.5V.

Key Features		Applications/Uses
Enhanced ESD Protection on RS-232 I/O Pins and All Logic Pins ±15kV—Human Body Model ±8kV—IEC 1000-4-2 Contact Discharge ±15kV—IEC 1000-4-2 Air-Gap Discharge Guaranteed Data Rate: 250kbps 10nA Low-Power Shutdown with Receivers Active Schmitt Triggers on All Inputs Flow-Through Pinout Meets EIA/TIA-232 Specifications Down to 3.0V Guaranteed 6V/µs Slew Rate Low-Level Logic Thresholds (MAX3248E) RS-232-Compatible Outputs to 2.7V		Battery-Powered Applications Cellular Data Cables Data Cradles Modems Peripherals Printers

Diagram

Typical Operating Circuit

Application Notes

Application Note 739: Design Considerations for Data-Lump Cables - MAX3238E, MAX3248E Application Note 836: Selecting and using RS-232 Interface Parts for Your Power Supply Voltages - MAX3238E Application Note 882: RS-232 Features Explained - MAX3238E, MAX3248E Application Note 2141: Determining Clock Accuracy Requirements for UART Communications - MAX3238E, MAX3248E

Design Guides

Interface (PDF)

Reliability Reports

Reliability Report: MAX3238E.pdf Show FIT data for: MAX3238E MAX3248E Request Reliability Report for: MAX3248E

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-14 of 14

MAX3238E	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX3238ECAI			Active	SSOP;28 pin;81.6 mm² Outline Drawing: 21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28-1*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX3238ECAI-T			Active	Land Pattern: Not Available	0°C to +70°C	See data sheet
MAX3238ECAI+			Active	SSOP;28 pin;81.6 mm² Outline Drawing: 21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+1*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX3238ECAI+T			Active	SSOP;28 pin;81.6 mm² Outline Drawing: 21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+1*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX3238EEAI			Active	SSOP;28 pin;81.6 mm² Outline Drawing: 21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX3238EEAI-T			Active	SSOP;28 pin;81.6 mm² Outline Drawing: 21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX3238EEAI+			Active	SSOP;28 pin;81.6 mm² Outline Drawing: 21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX3238EEAI+T			Active	SSOP;28 pin;81.6 mm² Outline Drawing: 21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX3248E	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX3248EEAI+			Active	SSOP;28 pin;81.6 mm² Outline Drawing: 21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX3248EEAI+T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX3248ECAI			Active	SSOP;28 pin;81.6 mm² Outline Drawing: 21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28-1*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX3248ECAI-T			Active	Land Pattern: Not Available	0°C to +70°C	See data sheet
MAX3248EEAI			Active	SSOP;28 pin;81.6 mm² Outline Drawing: 21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX3248EEAI-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet

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