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MAX3238 Dataheets PDF



Part Number MAX3238
Manufacturers Maxim
Logo Maxim
Description +3.0V to +5.5V / 1A / up to 250kbps / True RS-232 Transceiver with AutoShutdown Plus
Datasheet MAX3238 DatasheetMAX3238 Datasheet (PDF)

19-1144; Rev 0; 9/96 +3.0V to +5.5V, 1µA, up to 250kbps, True RS-232 Transceiver with AutoShutdown Plus™ _______________General Description 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 .

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19-1144; Rev 0; 9/96 +3.0V to +5.5V, 1µA, up to 250kbps, True RS-232 Transceiver with AutoShutdown Plus™ _______________General Description 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. ____________________________Features o 1µA Supply Current Achieved with AutoShutdown Plus o Guaranteed Data Rate: 250kbps o 1µA Low-Power Shutdown o Receivers Active in AutoShutdown Plus Mode o Flow-Through Pinout o Meets EIA/TIA-232 Specifications Down to 3.0V o Guaranteed 6V/µs Slew Rate MAX3238* ______________Ordering Information PART MAX3238CAI MAX3238EAI TEMP. RANGE 0°C to +70°C -40°C to +85°C PIN-PACKAGE 28 SSOP 28 SSOP __________________Pin Configuration TOP VIEW C2+ GND C2VT1OUT T2OUT T3OUT R1IN R2IN 1 2 3 4 5 6 7 8 9 28 C1+ 27 V+ 26 VCC 25 C1- ________________________Applications Notebook, Subnotebook, and Palmtop Computers High-Speed Modems Battery-Powered Equipment Hand-Held Equipment Peripherals Printers MAX3238 24 T1IN 23 T2IN 22 T3IN 21 R1OUT 20 R2OUT 19 T4IN 18 R3OUT 17 T5IN 16 R1OUTB 15 INVALID T4OUT 10 R3IN 11 Typical Operating Circuit appears at end of data sheet. T5OUT 12 FORCEON 13 FORCEOFF 14 AutoShutdown Plus is a trademark of Maxim Integrated Products. *Patents Pending SSOP 1 ________________________________________________________________ Maxim Integrated Products For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 +3.0V to +5.5V, 1µA, up to 250kbps, True RS-232 Transceiver with AutoShutdown Plus™ MAX3238 ABSOLUTE MAXIMUM RATINGS VCC ...........................................................................-0.3V to +6V V+ (Note 1) ...............................................................-0.3V to +7V V- (Note 1) ................................................................+0.3V to -7V V+ + |V-| (Note 1) .................................................................+13V Input Voltages T_IN, FORCEOFF, FORCEON ..............................-0.3V to +6V R_IN .................................................................................±25V Output Voltages T_OUT...........................................................................±13.2V R_OUT, INVALID ....................................-0.3V to (VCC + 0.3V) Short-Circuit Duration T_OUT (one at a time) ............................................Continuous Continuous Power Dissipation (TA = +70°C) SSOP (derate 9.52mW/°C above +70°C) ....................762mW Operating Temperature Ranges MAX3238CAI ......................................................0°C to +70°C MAX3238EAI....................................................-40°C to +85°C Storage Temperature Range ............................-65°C to +160°C Lead Temperature (soldering, 10sec) ............................+300°C Note 1: V+ and V- can have a maximum magnitude of +7V, but their absolute difference can not exceed +13V. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V CC = +3.0V to +5.5V; C1–C4 = 0.1µF (tested at 3.3V ±5%), C1–C4 = 0.22µF (tested at 3.3V ±10%), C1 = 0.047µF and C2–C4 = 0.33µF (tested at 5.0V ±10%); TA = TMIN to TMAX; unless otherwise noted. Typical values are at TA = +25°C.).


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