MAX3130/MAX3131 19-1402 Rev 0 11/98 3V to 5.5V, IrDA Infrared Transceiver with Integrated RS-232 Interface General Description Features The MAX3130/MAX3131 combine an IrDA 1.2 compati- Integrated RS-232 and IrDA in Single 28-Pin SSOP ble infrared transceiver with an RS-232 interfaceall in Package a single 3V-powered hybrid microcircuit. The infrared 370A Supply Current transceiver supports IrDA data rates of 2.4kbps to 115kbps. The infrared receive channel provides a high- IrDA 1.2 Compatible: 2.4kbps to 115kbps gain/low-noise PIN-diode amplifier with 100A of ambi- Data Rate ent photodiode current rejection at a +3V supply. A On-Board IR Encoder/Decoder Allows Use of high-power LED driver capable of sinking 200mA is included in the infrared transmit path. The on-board Non-IrDA UARTs encoder/decoder (ENDEC) compresses/stretches sig- +3.0V to +5.5V Single-Supply Operation nals to and from the external UART, allowing IrDA com- munication even with non-IrDA UARTs. Meet EIA/TIA-232 Specifications Down to +3V A 2-driver/2-receiver RS-232 transceiver supports data 200mA, High-Current Infrared LED Drive rates up to 120kbps. A proprietary, high-efficiency, dual 1A Low-Power Shutdown with RS-232 charge-pump power supply and a low-dropout trans- mitter combine to deliver true RS-232 performance from Receivers Active a single +3.0V to +5.5V supply. Selectable shutdown for IR and RS-232 circuitry reduces supply current to Ordering Information 1A. PART TEMP. RANGE PIN-PACKAGE The MAX3130 is optimized for applications using a sin- MAX3130CAI 0C to +70C 28 SSOP gle UART for both infrared and RS-232 communication. The infrared transmitter input and infrared receiver out- MAX3130EAI -40C to +85C 28 SSOP put are multiplexed with one RS-232 transmitter input MAX3131CAI 0C to +70C 28 SSOP and one RS-232 receiver output, respectively. The MAX3131EAI -40C to +85C 28 SSOP MAX3131s IrDA transceiver and RS-232 transceivers are separate and have their own data inputs and outputs. Pin Configuration Both these devices require a minimum of external com- ponents: four small 0.1F capacitors, a photodiode, an TOP VIEW infrared LED, and a current-setting resistor. EDGEDET (RXD) 1 28 R2OUT Applications T1IN 2 27 R2IN T2IN 3 26 T2OUT Personal Digital Assistants (PDAs) IRMODE (TXD) 4 25 RSSD Palmtop Computers R1OUT 5 24 V- Battery-Powered Systems MAX3130 R1IN 6 23 C2- MAX3131 Hand-Held Equipment T1OUT 7 22 C2+ Peripherals BAUD16 8 21 C1- IrDA Applications GND 9 20 C1+ Cellular Phones V 10 19 V+ CC N.C. 11 18 N.C. AV 12 17 LEDC CC AGND 13 16 PGND PINC 14 15 IRSD SSOP ( ) ARE FOR MAX3131 Maxim Integrated Products 1 For free samples & the latest literature: 3V to 5.5V, IrDA Infrared Transceiver with Integrated RS-232 Interface ABSOLUTE MAXIMUM RATINGS V to GND..............................................................-0.3V to +6V Output Short-Circuit Duration (to V or GND) CC CC AV to AGND .........................................................-0.3V to +6V T1OUT, T2OUT.....................................................Continuous CC V to AV .......................................................................0.3V Output Currents CC CC AGND, PGND to GND ........................................................0.1V LEDC Continuous........................................................200mA V+ to GND................................................................-0.3V to +7V LEDC 20% Duty Cycle t < 90s..............................500mA ON V- to GND .................................................................+0.3V to -7V Input Current V+ to V-................................................................................+13V PINC ..............................................................................10mA Inputs (referenced to GND) Continuous Power Dissipation (T = +70C) A T1IN, T2IN, TXD, RSSD, IRMODE, BAUD16, SSOP (derate 9.52mW/C above +70C)...................762mW IRSD....................................................................-0.3V to +6V Operating Temperature Ranges R1IN, R2IN .....................................................................25V MAX3130/MAX3131CAI ....................................0C to +70C Outputs (referenced to GND) MAX3130/MAX3131EAI..................................-40C to +85C T1OUT, T2OUT............................................................13.2V Storage Temperature Range .............................-65C to +160C R1OUT, R2OUT, EDGEDET, RXD.........-0.3V to (V + 0.3V) Lead Temperature (soldering, 10sec) .............................+300C CC LEDC...................................................................-0.3V to +6V 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 = AV = 3.0V to 5.5V, GND = AGND = PGND, C1C4 = 0.1F (Note 1), T = T to T , unless otherwise noted. Typical CC CC A MIN MAX values are at T = +25C and V = AV = 3.3V.) A CC CC PARAMETER CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS Power-Supply Current V = 3.3V or 5V, T = +25C (Note 2) 0.25 1.0 mA CC A Analog Power-Supply Current T = +25C (Note 2) 120 200 A A RSSD = low or IRMODE = low, Shutdown Supply Current 1.0 10 A T = +25C (Note 2) A Shutdown Analog Supply Current IRSD = low, T = +25C (Note 2) 0.01 1.0 A A LOGIC INPUTS (T1IN, T2IN, TXD, IRMODE, BAUD16, IRSD, RSSD) Input Logic Threshold Low 0.8 V V = AV = 3.3V 2.0 CC CC Input Logic Threshold High V V = AV = 5V 2.4 CC CC Input Leakage Current V = 0 to V 0.01 1.0 A IN CC LOGIC OUTPUTS (R1OUT, R2OUT, RXD, EDGEDET) Output Voltage Low I = 1.6mA 0.1 0.4 V SINK V -V - CC CC Output Voltage High I = 1.0mA V SOURCE 0.6 0.05 IR RECEIVER Data Rate (Note 3) 2.4 115.2 kbps Equivalent Input Noise Current 10 nA RMS Input Current Sensitivity (Note 3) 0.0002 6 mA AV = 3.3V 100 A Ambient Photodiode Current CC A Rejection AV = 5V 375 CC 2 MAX3130/MAX3131