MAX3388E/MAX3389E 19-1845 Rev 1 9/01 2.5V, 15kV ESD-Protected RS-232 Transceivers for PDAs and Cell Phones General Description Features The MAX3388E/MAX3389E are 2.5V-powered EIA/TIA- V Pin for Compatibility with Mixed-Voltage L 232 and V.28/V.24 communications interfaces with low Systems power requirements, high data-rate capabilities, and Additional I/O for Hot-Sync Applications enhanced electrostatic discharge (ESD) protection. The MAX3388E/MAX3389E have two receivers and three 15kV ESD Protection on Rx Inputs, Tx Outputs, transmitters. All RS-232 inputs and outputs are protected LIN, and SWIN to 15kV using the IEC 1000-4-2 Air-Gap Discharge Low 300A Supply Current method, 8kV using the IEC 1000-4-2 Contact Discharge Guaranteed 460kbps Data Rate method, and 15kV using the Human Body Model. 1A Low-Power Shutdown In addition to the traditional RS-232 I/O, these devices have dedicated logic-level I/O pins for additional device-to- Integrated Switch for Powering Remote Circuitry device handshaking. During shutdown the logic-level I/O Flow-Through Pinout pins are active for the MAX3389E. An internal 62 switch is provided to switch power to external circuitry or modules. L Active During Shutdown (MAX3389E) OUT A proprietary low-dropout transmitter output stage enables RS-232 compatible performance from a +2.35V Applications to +3.0V supply with a dual charge pump. The charge Subnotebook/Palmtop Computers pump requires only four small 0.1F capacitors for oper- PDAs and PDA Cradles ation from a +2.5V supply. The MAX3388E/MAX3389E are capable of running at data rates up to 460kbps while Cell Phone Data Cables maintaining RS-232-compatible output levels. Battery-Powered Equipment The MAX3388E/MAX3389E have a unique V pin that L Hand-Held Equipment allows interoperation in mixed-logic voltage systems. Peripherals Both input and output logic levels are pin programma- ble through the V pin. The MAX3388E/MAX3389E are L Ordering Information available in a space-saving TSSOP package. PART TEMP. RANGE PIN-PACKAGE Typical Operating Circuit MAX3388ECUG 0C to +70C 24 TSSOP MAX3388EEUG -40C to +85C 24 TSSOP +2.5V 24 23 14 0C to +70C 24 TSSOP C MAX3389ECUG BYPASS V V SHDN CC L 2 1 C1+ MAX3389EEUG -40C to +85C 24 TSSOP V+ C1 C3 3 0.1F C1- 0.1F MAX3388E 4 6 C2+ MAX3389E V- Pin Configuration C2 C4 0.1F 5 0.1F C2- 7 T1OUT T1IN TOP VIEW 21 C1+ 1 24 SHDN T2IN T2OUT 8 20 V+ 2 23 V CC 9 T3IN T3OUT RS-232 C1- 3 22 GND 19 I/O V L C2+ 4 21 T1OUT 13 R1OUT R1IN 18 MAX3388E C2- 5 20 T2OUT 5k MAX3389E V V- 6 19 T3OUT L 12 R2OUT R2IN 17 T1IN 7 18 R1IN 10 LOUT 5k T2IN 8 17 R2IN LIN T3IN 9 16 LIN 16 30k SHDN LOUT 10 15 SWIN 11 15 SWOUT SWIN SWOUT 11 14 V L = 15kV ESD PROTECTION GND 22 R2OUT 12 13 R1OUT C TSSOP 4. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.2.5V, 15kV ESD-Protected RS-232 Transceivers for PDAs and Cell Phones ABSOLUTE MAXIMUM RATINGS V to GND..............................................................-0.3V to +6V Short-Circuit Duration T OUT to GND........................Continuous CC V to GND...................................................-0.3V to (V + 0.3V) Continuous Power Dissipation (T = +70C) L CC A V+ to GND................................................................-0.3V to +7V 24-Pin TSSOP (derate 12.2mW/C above +70C) ........975mW V- to GND .................................................................+0.3V to -7V Operating Temperature Ranges V+ +V-(Note 1) ............................................................... +13V MAX338 ECUG ...................................................0C to +70C Input Voltages MAX338 EEUG.................................................-40C to +85C T IN, SHDN, LIN to GND.......................................-0.3V to +6V Junction Temperature......................................................+150C R IN to GND .....................................................................25V Storage Temperature Range .............................-65C to +150C SWIN to GND...........................................-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C CC Output Voltages T OUT to GND...............................................................13.2V R OUT, SWOUT, LOUT to GND ................-0.3V to (V + 0.3V) L Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot 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. DC ELECTRICAL CHARACTERISTICS (V = V = +2.35V to +3.0V, C1C4 = 0.1F, T = T to T , unless otherwise noted. Typical values are at V = V = +2.5V, CC L A MIN MAX CC L T = +25C.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS (V = +2.5V, T = +25C) CC A Shutdown Supply Current SHDN = GND, all inputs at GND 110 A Supply Current SHDN = V , no load 0.3 1 mA CC LOGIC INPUTS (T IN, SHDN) Input Logic Low V = +2.5V 0.6 V L Input Logic High V = +2.5V 1.5 V L Transmitter Input Hysteresis 0.4 V Input Leakage Current 0.01 1 A RECEIVER OUTPUTS Output Leakage Current R OUT, SHDN = 0 0.05 10 A Output Voltage Low I = 1.6mA 0.4 V OUT V- V - L L Output Voltage High I = -1mA V OUT 0.6 0.13 RECEIVER INPUTS Input Voltage Range -25 +25 V Input Threshold Low T = +25C, V = +2.5V 0.6 1.1 V A L Input Threshold High T = +25C, V = +2.5V 1.8 2.4 V A L Input Hysteresis 0.7 V Input Resistance T = +25C 35 7 k A TRANSMITTER OUTPUTS All transmitter outputs loaded with 3k to Output Voltage Swing 3.7 4.2 V ground Output Resistance V = 0, transmitter output = 2V 300 10M CC Output Short-Circuit Current V = 0 60 mA T OUT 2 MAX3388E/MAX3389E