MAX3238E/MAX3248E 19-1632 Rev 1 6/01 +3.0V to +5.5V, 10nA, 250kbps RS-232 Transceivers with 15kV ESD-Protected I/O and Logic Pins General Description Features The MAX3238E/MAX3248E transceivers use Maxims Enhanced ESD Protection on RS-232 I/O Pins and revolutionary AutoShutdown Plus feature to achieve All Logic Pins 10nA supply current. These devices shut down the on- 15kVHuman Body Model board power supply and drivers when they do not sense 8kVIEC 1000-4-2 Contact Discharge a valid signal transition on either the receiver or transmit- 15kVIEC 1000-4-2 Air-Gap Discharge ter inputs. This occurs if the RS-232 cable is disconnect- ed or if the transmitters of the connected peripheral are Guaranteed Data Rate: 250kbps turned off. The devices turn on again when a valid transi- 10nA Low-Power Shutdown with Receivers Active tion is applied to any RS-232 receiver or transmitter input. AutoShutdown Plus automatically achieves this power Schmitt Triggers on All Inputs savings through its on-board circuitry, as no changes are Flow-Through Pinout required to the existing BIOS or operating system. Meets EIA/TIA-232 Specifications Down to 3.0V All RS-232 inputs and outputs, as well as the logic I/O pins, have enhanced ESD protection to 15kV. The addi- Guaranteed 6V/s Slew Rate tional ESD protection on the logic I/O pins makes the Low-Level Logic Thresholds (MAX3248E) MAX3238E/MAX3248E ideal for cell phone data cable applications because it eliminates the need for costly RS-232-Compatible Outputs to 2.7V external TransZorb or protection schemes. The MAX3238E/MAX3248E contain five drivers and three receivers and are 3V-powered EIA/TIA-232 and V.28/V.24 communication interfaces intended for cell phones, data Ordering Information cables, and modem applications. A proprietary, high-effi- PART TEMP. RANGE PIN-PACKAGE ciency, dual charge-pump power supply and a low- MAX3238ECAI 0C to +70C 28 SSOP dropout transmitter combine to deliver true RS-232 performance from a single +3.0V to +5.5V supply. A MAX3238EEAI -40C to +85C 28 SSOP guaranteed data rate of 250kbps provides compatibility MAX3248ECAI 0C to +70C 28 SSOP with popular software for communicating with personal MAX3248EEAI -40C to +85C 28 SSOP computers. Typical Operating Circuit appears at end of data sheet. The MAX3238E and the MAX3248E differ only in their Pin Configuration input logic thresholds. The MAX3238E has standard logic thresholds, while the MAX3248E has low-level logic TOP VIEW thresholds of 0.6V to 1.2V, which are ideal for 1.8V sys- C2+ tems. 1 28 C1+ GND V+ The transmitter inputs, FORCEON, and FORCEOFF have 2 27 a 400k active positive feedback resistor. Once driven to C2- 26 V 3 CC a valid logic level, they will retain this level if the driving V- 4 25 C1- signal is removed or goes high impedance. Unused transmitter and logic inputs may be left unconnected. The T1OUT 5 24 T1IN MAX3238E MAX3238E/MAX3248E can operate with supply voltages T2OUT 6 23 T2IN MAX3248E ranging from +3.0V to +5.5V. T3OUT 7 22 T3IN Applications R1IN 8 21 R1OUT Cellular Data Cables Peripherals R2IN 9 20 R2OUT Modems Data Cradles 19 10 T4IN T4OUT Battery-Powered Equipment Printers R3IN 11 18 R3OUT T5OUT 12 17 T5IN AutoShutdown Plus is a trademark of Maxim Integrated Products. 13 16 R1OUTB TransZorb is a trademark of General Semiconductor Industries, Inc. FORCEON C4 15 FORCEOFF 14 INVALID 4,r pg. SSOP 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.+3.0V to +5.5V, 10nA, 250kbps RS-232 Transceivers with 15kV ESD-Protected I/O and Logic Pins ABSOLUTE MAXIMUM RATINGS V ...........................................................................-0.3V to +6V Short-Circuit Duration CC V+ (Note 1)...............................................................-0.3V to +7V T OUT (one at a time)............................................Continuous V- (Note 1) ................................................................+0.3V to -7V Continuous Power Dissipation (T = +70C) A V+ + V- (Note 1) .................................................................+13V 28-Pin SSOP (derate 9.52mW/C above +70C) .........762mW Input Voltages Operating Temperature Ranges T IN, FORCEOFF, FORCEON..............................-0.3V to +6V MAX3238ECAI/MAX3248ECAI ...........................0C to +70C R IN .................................................................................25V MAX3238EEAI/MAX3248EEAI .........................-40C to +85C Output Voltages Storage Temperature Range ............................-65C to +150C T OUT...........................................................................13.2V Lead Temperature (soldering, 10s) ................................+300C R OUT, INVALID ....................................-0.3V to (V + 0.3V) CC 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 = +3.0V to +5.5V, C1C4 = 0.1F (tested at 3.3V 5%), C1C4 = 0.22F (tested at 3.3V 10%), C1 = 0.047F, and CC C2C4 = 0.33F (tested at 5.0V 10%), T = T to T , unless otherwise noted. Typical values are at T = +25C.) A MIN MAX A PARAMETER CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS (V = +3.3V or +5.0V, T = +25C) CC A Receivers idle, T IN = V or GND, FORCEON = CC 0.75 6 A GND, FORCEOFF = V CC Supply Current, AutoShutdown Plus R IN = FORCEON = GND, FORCEOFF = V CC, 10 300 nA T IN = V or GND CC Supply Current, Shutdown FORCEOFF = GND, R IN = GND, T IN = V or GND 10 300 nA CC Supply Current, AutoShutdown Plus FORCEON = FORCEOFF = V , no load 0.5 2.0 mA CC Disabled LOGIC INPUTS AND RECEIVER OUTPUTS T IN (active) 0.8 1.20 FORCEON, FORCEOFF, and T IN 0.8 1.00 wake-up threshold V = 3.3V MAX3238E CC FORCEON, FORCEOFF, and T IN 0.8 1.45 wake-up threshold V = 5.0V CC Input Logic Threshold Low V T IN (active) 0.6 0.7 FORCEON, FORCEOFF, and T IN 0.6 0.85 MAX3248E wake-up threshold V = 3.3V CC FORCEON, FORCEOFF, and T IN 0.6 1.0 wake-up threshold V = 5.0V CC T IN (active) 1.60 2.0 FORCEON, FORCEOFF, and T IN 1.30 2.0 wake-up threshold V = 3.3V MAX3238E CC FORCEON, FORCEOFF, and T IN 2.10 2.4 wake-up threshold V = 5.0V CC V Input Logic Threshold High T IN (active) 1.10 1.2 FORCEON, FORCEOFF, and T IN 0.95 1.2 wake-up threshold V = 3.3V MAX3248E CC FORCEON, FORCEOFF, and T IN 1.15 1.6 wake-up threshold V = 5.0V CC 2 MAX3238E/MAX3248E