MAX3322E/MAX3323E 19-2667 Rev 1 1/03 15kV ESD-Protected, RS-232 Transceivers for Multidrop Applications General Description Features The MAX3322E/MAX3323E 3.0V to 5.5V powered Pin-Selectable 5k /High-Impedance Receivers EIA/TIA-232 and V.28/V.24 communications interfaces Transmitter Outputs Three-Stated by Logic are designed for multidrop applications with low power Control requirements, high data-rate capabilities, and enhanced electrostatic discharge (ESD) protection. All V Pin for Compatibility with Mixed Voltage L RS-232 inputs and outputs are protected to 15kV Systems using the IEC 1000-4-2 Air-Gap Discharge method, 1Tx/1Rx (MAX3323E) or 2Tx/2Rx (MAX3322E) 8kV using the IEC 1000-4-2 Contact Discharge method, and 15kV using the Human Body Model. Versions The MAX3322E/MAX3323E have pin-selectable 250kbps Data Rate 5k /high-impedance RS-232 receivers. These devices 1A Low-Power Shutdown are capable of receiving data in high-impedance mode. In multidrop applications, one receiver has a 5k input High ESD Protection for RS-232 I/O Pins resistance, while the other receivers are high imped- 15kVHuman Body Model ance to ensure the RS-232 standard is observed. Logic 8kVIEC 1000-4-2 Contact Discharge control permits selection of the functional mode: high 15kVIEC 1000-4-2 Air-Gap Discharge impedance or RS-232 standard load. The transmitters are enabled by logic control to allow the multiplexing of the inputs to a single UART. Ordering Information A proprietary low-dropout transmitter output stage enables true RS-232 performance from a 3.0V to 5.5V PART TEMP RANGE PIN-PACKAGE supply with a dual charge pump. The charge pump requires only four small 0.1F capacitors for operation MAX3322EEUP -40C to +85C 20 TSSOP from a 3.3V supply. The MAX3322E/MAX3323E are MAX3323EEUE -40C to +85C 16 TSSOP capable of running at data rates up to 250kbps while MAX3323EEPE -40C to +85C 16 DIP maintaining RS-232-compliant output levels. The MAX3322E/MAX3323E have a unique V pin that allows L operation in mixed-logic voltage systems. Both input and output logic levels are pin programmable through Pin Configurations the V pin. L The MAX3322E is a 2Tx/2Rx device for hardware hand- TOP VIEW shaking in standard RS-232 mode, and the MAX3323E is a 1Tx/1Rx, required in most multidrop applications. C1+ 1 20 V CC The MAX3322E is offered in a space-saving TSSOP V+ 2 19 GND package. The MAX3323E is offered in 16-pin DIP and C1- 3 18 SHDN space-saving TSSOP packages. C2+ 4 17 V L Applications MAX3322E C2- 5 16 RENABLE Bar-Code Scanners V- 6 15 TXENABLE Video Security TOUT2 7 14 TIN2 Industrial Data Acquisition RIN2 8 13 ROUT2 Data Splitters TOUT1 9 12 TIN1 RIN1 10 11 ROUT1 TSSOP Pin Configurations continued at end of data sheet. Typical Operating Circuit and Functional Diagram appear at end of data sheet. 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.15kV ESD-Protected, RS-232 Transceivers for Multidrop Applications ABSOLUTE MAXIMUM RATINGS All Voltages Referenced to GND Short-Circuit Duration TOUT to GND........................Continuous V , V ....................................................................-0.3V to +6V Continuous Power Dissipation (T = +70C) CC L A V+ (Note 1)....................................................(V - 0.3V) to +7V 16-Pin DIP (derate 10.5mW/C above +70C)............842mW CC V- (Note 1) ................................................................+0.3V to -7V 16-Pin TSSOP (derate 9.4mW/C above +70C) ........755mW V+ + V- (Note 1) .................................................................+13V 20-Pin TSSOP(derate 11mW/C above +70C) ..........879mW Input Voltages Operating Temperature Range TIN , RENABLE, TXENABLE, SHDN.....................-0.3V to +6V MAX3322E/MAX3323E ...................................-40C to +85C RIN ..................................................................................25V Junction Temperature..................................................... +150C Output Voltages Storage Temperature Range .............................-65C to +150C TOUT ............................................................................13.2V Lead Temperature (soldering, 10s) .................................+300C ROUT ........................................................-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 = 3.0V to 5.5V, V = 1.65V to 5.5V, C1C4 = 0.1F, tested at +3.3V 10% C1 = 0.047F, C2 = C3 = C4 = 0.33F, tested at +5V CC L 10% T = T to T . Typical values are at V = V = 3.3V and T = +25C, unless otherwise noted.) A MIN MAX CC L A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS Supply Current Normal Operation I SHDN = V , no load 1 mA CC L Supply Current in Shutdown I SHDN = 0V, no load 1 10 A CC(SHDN) TRANSMITTER LOGIC INPUTS Input Logic Threshold Low 0.4 V V 1.8V V - 0.4 L L Input Logic Threshold High V V > 1.8V 2/3 x V L L Transmitter Input Hysteresis 0.2 V Input Leakage Current I 0.01 1 A IL LOGIC INPUTS (TXENABLE, RENABLE, SHDN) Input Logic Threshold Low 0.4 V Input Logic Threshold High 2/3 x V V L Input Leakage Current 0.01 1 A RECEIVER OUTPUTS Output Leakage Current I Receivers disabled, SHDN = 0V + 0.05 + 10 A OL I = 1.6mA, V > 1.8V 0.4 OUT L Output Voltage Low V V OL I = 1mA, V 1.8V 0.4 OUT L I = -1mA, V > 1.8V V - 0.4 V - 0.1 OUT L L L Output Voltage High V V OH I = -500A, V 1.8V V - 0.4 V - 0.1 OUT L L L RECEIVER INPUTS Input Voltage Range V -25 +25 V RIN V = 1.65V 0.25 0.6 L Input Threshold Low V = 3.3V 0.6 1.2 V L V = 5.0V 0.8 1.5 L 2 MAX3322E/MAX3323E