MAX3238

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MAX3238 +3.0V to +5.5V, 1µA, Up to 250kbps, True RS-232 Transceiver with AutoShutdown Plus
The MAX3238* true RS-232 transceiver achieves a 1µA supply current with Maxim‘s revolutionary AutoShutdown Plus™ feature. When the device does not sense a valid signal transition on either the receiver or transmitter inputs within 30sec, the on-board power supply and drivers shut down. This occurs if the RS-232 cable is disconnected or if the transmitters of the connected peripheral are inactive. The system turns on again when a valid transition is applied to any RS-232 receiver or transmitter input, saving power without changes to the existing BIOS or operating system.
The MAX3238 5-driver/3-receiver complete serial port is a 3V-powered EIA/TIA-232 and V.28/V.24 communications interface intended for notebook or subnotebook computer 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 MAX3238 requires only 0.1µF capacitors in 3.3V operation. It is ideal for 3.3V-only systems, mixed 3.3V and 5.0V systems, or 5V-only systems that require true RS-232 performance.
Receiver R1 has an extra, always-active output (in addition to its standard output), which allows external devices, such as a modem, to be monitored without forward biasing the protection diodes in circuitry that may have VCC completely removed.
The MAX3238 is available in a space-saving SSOP package.
Key Features   Applications
1µA Supply Current Achieved with AutoShutdown Plus Guaranteed Data Rate: 250kbps 1µA Low-Power Shutdown Receivers Active in AutoShutdown Plus Mode Flow-Through Pinout Meets EIA/TIA-232 Specifications Down to 3.0V Guaranteed 6V/µs Slew Rate Auto shutdown reduces supply current to 1uA
 
Battery-Powered Applications
Hand-Held Equipment
High-Speed Modems
Notebook, Subnotebook, and Palmtop Computers
Peripherals
Printers
 
Key Specifications: RS-232 Line Driver/Receivers
Part Number Supply Voltage (V) No. of Tx No. of Rx Data Rate (kbps) Typ. ICC Current (mA) Int. Chrg. Pump No. of Ext. Caps Nom. Cap. Value (µF) No. of Rx Active in Shutdown Package Operating Temp. Range (°C) Price
@ 1k
MAX3238 3.3
5 5 3 250 0.5 Yes 4 0.1 028/SSOP -40 to +85
0 to +70 $3.29
Application Notes
App Note 2141: Determining Clock Accuracy Requirements for UART Communications - MAX3238App Note 2020: Choosing the Right RS-232 Transceiver - MAX3238
Notes and Comments
AutoShutdown Plus is a trademark of Maxim Integrated Products.
*Patents Pending
Links to More Information   Didn‘t Find What You Need?
Printed Data Sheet: #19-1144; Rev 1; 2002-11-04
Complete Data Sheet: (PDF 200k):Download orE-Mail
Reliability Report:MAX3238xAI.pdf
Request Samples:MAX3238
Ordering Information (versions, part numbers):MAX3238RS-232 ResourcesBuy DirectPrice and Availability
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Diagram
Typical Operating Circuit

Document Ref.: 19-1144; Rev 1; 2002-11-04
This page last modified: 2006-01-04
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