MAX3314EESA+T

19-1696; Rev 1; 3/01 ±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceiver The MAX3314E has a SHDN function that reduces supply current to 1µA. The transmitter is disabled and put into tristate while the receiver remains active. The MAX3314E is available in 8-pin µMAX, SOT23, and SO packages. ________________________Applications Features ♦ ESD Protection for RS-232 I/O Pins ±15kV—Human Body Model ±8kV—IEC 1000-4-2 Contact Discharge ±15kV—IEC 1000-4-2 Air-Gap Discharge ♦ 1µA Low-Power Shutdown with Receiver Active ♦ 30µA Operating Supply Current ♦ 460kbps Guaranteed Data Rate ♦ 8-Pin SOT23 Package ♦ ±3.7V RS-232-Compatible Levels Ordering Information PART MAX3314ECKA-T TEMP. RANGE 0°C to +70°C MAX3314ECUA Digital Cameras PDAs GPS POS Telecommunications Handy-Terminals Set-Top Boxes MAX3314ECSA 0°C to +70°C 8 µMAX 0°C to +70°C 8 SO MAX3314EEKA-T -40°C to +85°C 8 SOT23-8 MAX3314EEUA -40°C to +85°C 8 µMAX MAX3314EESA -40°C to +85°C 8 SO Typical Operating Circuit +5V PIN-PACKAGE 8 SOT23-8 Pin Configuration TOP VIEW CBYPASS 0.1µF 1 VCC SHDN V- MAX3314E 2 7 -5V 0.1µF 4 TIN TOUT 5 VCC 1 8 GND 7 V- 3 6 RIN TIN 4 5 TOUT SHDN 2 MAX3314E ROUT 3 ROUT RIN 6 5kΩ SOT23/µMAX/SO GND 8 CAPACITORS MAY BE POLARIZED OR NONPOLARIZED. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX3314E General Description The MAX3314E is a ±5V-powered EIA/TIA-232-compatible interface. It has one transmitter and one receiver in a flow-through architecture. The transmitter output and the receiver input are protected to ±15kV using IEC 1000-4-2 Air-Gap Discharge, ±8kV using IEC 1000-4-2 Contact Discharge, and ±15kV using the Human Body Model. The transmitter has a low-dropout output stage providing minimum RS-232-compatible ±3.7V output levels while driving 3kΩ and 1000pF at 460kbps. Both +5V and -5V must be supplied externally. MAX3314E ±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceiver ABSOLUTE MAXIMUM RATINGS VCC to GND .............................................................-0.3V to +6V V- to GND ...............................................................+0.3V to -6V Input Voltages TIN, SHDN to GND ...............................................-0.3V to +6V RIN to GND ......................................................................±25V Output Voltages TOUT to GND................................................................±13.2V ROUT .................................................…-0.3V to (VCC + 0.3V) Short-Circuit Duration TOUT to GND .........................................................Continuous Continuous Power Dissipation 8-Pin SOT23 (derate 9.7mW/°C above +70°C)...........777mW 8-Pin µMAX (derate 4.1mW/°C above +70°C) ............300mW 8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW Operating Temperature Ranges MAX3314EC_A ..................................................0°C to +70°C MAX3314EE_A................................................-40°C to +85°C Junction Temperature .....................................................+150°C Storage Temperature Range ............................-65°C to +150°C Lead Temperature (soldering, 10s) ................................+300°C 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 (VCC = +5V, V- = -5V, TA = TMIN to TMAX. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS Positive Supply Operating Range VCC 4.75 5 5.25 V Negative Supply Operating Range V- -4.75 -5 -5.25 V Positive Supply Current SHDN = VCC, no load 30 100 µA Negative Supply Current SHDN = VCC, no load 15 30 µA Shutdown Supply Current SHDN = GND 1 10 µA LOGIC INPUTS (TIN, SHDN) Input Logic Threshold Low VIL Input Logic Threshold High VIH 0.8 V 2.4 Transmitter Input Hysteresis Input Leakage Current V 0.5 V ±0.01 µA RECEIVER OUTPUT Output Voltage Low Output Voltage High VOL VOH IOUT = 1.6mA IOUT = -1.0mA 0.4 VCC - 0.3 VCC - 0.1 V V RECEIVER INPUT Input Threshold Low VIL Input Threshold High VIH 0.8 V 2.4 V Input Hysteresis 0.5 V Input Resistance 5 kΩ TRANSMITTER OUTPUT Output Voltage Swing Transmitter output loaded with 3kΩ to ground ±3.7 Output Resistance (Note 1) VCC = V- = 0, transmitter output = ±2V 300 V Ω Output Short-Circuit Current Output Leakage Current VOUT = ±12V, transmitter disabled ±60 mA 25 µA ESD PROTECTION (Transmitter Output, Receiver Input) ESD-Protection Voltage 2 Human Body Model ±15 IEC 1000-4-2 Air-Gap Discharge ±15 IEC 1000-4-2 Contact Discharge ±8 _______________________________________________________________________________________ kV ±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceiver MAX3314E TIMING CHARACTERISTICS (VCC = +5V, V- = -5V, TA = TMIN to TMAX. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN RL = 3kΩ, CL = 1000pF, transmitter switching Maximum Data Rate TYP UNITS 460 kbps tPLH Receiver input to receiver output, CL = 150pF 0.15 tPHL Receiver input to receiver output, CL = 150pF 0.15 Receiver Propagation Delay MAX µs Transmitter Skew 100 ns Receiver Skew 50 ns 8 V/µs RL = 3kΩ to 7kΩ, CL = 150pF to 1000pF, measured from +3V to -3V or -3V to +3V Transition Region Slew Rate Note 1: Not tested, guaranteed by design. Typical Operating Characteristics (VCC = +5V, V- = -5V, 250kbps data rate, transmitter loaded with 3kΩ and CL, TA = +25°C, unless otherwise noted.) TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE 6 +SLEW 5 4 3 2 1 5 4 3 20kbps/120kbps 460kbps/250kbps 2 1 0 -1 -2 20kbps/120kbps -3 -4 460kbps/250kbps 500 1000 1500 2000 LOAD CAPACITANCE (pF) 2500 3000 4.0 250kbps 3.5 120kbps 3.0 2.5 2.0 1.5 20kbps 0.5 -6 0 460kbps 4.5 1.0 -5 0 5.0 SUPPLY CURRENT (mA) SLEW RATE (V/µs) 7 5.5 MAX3314E-02 -SLEW 6 TRANSMITTER OUTPUT VOLTAGE (V) 8 MAX3314E-01 9 SUPPLY CURRENT vs. LOAD CAPACITANCE MAX3314E-03 SLEW RATE vs. LOAD CAPACITANCE 0 0 500 1000 1500 2000 LOAD CAPACITANCE (pF) 2500 3000 0 500 1000 1500 2000 2500 3000 LOAD CAPACITANCE (pF) _______________________________________________________________________________________ 3 ±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceiver MAX3314E Pin Description PIN NAME FUNCTION 1 VCC 2 SHDN Shutdown, Active low (0 = off, 1 = on). 3 ROUT TTL/CMOS Receiver Output 4 TIN TTL/CMOS Transmitter Input 5 TOUT 6 RIN 7 V- 8 GND +5V ±5% External Power Supply. Decouple with a 0.1µF capacitor to ground. RS-232-Compatible Transmitter Output RS-232-Compatible Receiver Input -5V ±5% External Power Supply. Decouple with a 0.1µF capacitor to ground. Ground Detailed Description RS-232-Compatible Drivers parallel with 1000pF. The transmitter output displays no ringing or undesirable transients as the MAX3314E comes out of shutdown. The transmitter is an inverting level translator that converts CMOS-logic levels to ±3.7V EIA/TIA-232-compatible levels. It guarantees data rates up to 460kbps with worst-case loads of 3kΩ in parallel with 1000pF. When SHDN is driven low, the transmitter is disabled and put into tristate. The transmitter input does not have a pullup resistor. Connect to ground if unused. The MAX3314E maintains minimum RS-232-compatible ±3.7V transmitter output voltage even at high data rates. Figure 2 shows a transmitter loopback test circuit. Figure 3 shows the loopback test result at 120kbps, and Figure 4 shows the same test at 250kbps. RS-232-Compatible Receivers The MAX3314E’s receiver converts RS-232 signals to CMOS-logic output levels. The receiver is rated to receive signals to ±25V. It will remain active during shutdown mode. MAX3314E Shutdown Mode In shutdown mode, the transmitter output is put into high impedance (Table 1). This reduces supply current to 1µA. The time required to exit shutdown is less than 2.5µs. Applications Information Capacitor Selection The capacitor type used is not critical for proper operation; either polarized or nonpolarized capacitors are acceptable. If polarized capacitors are used, connect polarity as shown in the Typical Operating Circuit. Bypass VCC and V- to ground with at least 0.1µF. Transmitter Outputs When Exiting Shutdown High Data Rates ±15kV ESD Protection As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The MAX3314E driver outputs and receiver inputs have extra protection against static discharge. Maxim’s engineers have developed state-of-the-art structures to protect these pins against ESD of ±15kV without damage. The ESD structures withstand high ESD in all states: normal operation, shutdown, and powered down. After an ESD event, Maxim’s E versions keep working without latchup, whereas competing products can latch and must be powered down to remove latchup. ESD protection can be tested in various ways. The transmitter outputs and receiver inputs of the product family are characterized for protection to the following limits: • ±15kV using the Human Body Model • ±8kV using the Contact Discharge method specified in IEC 1000-4-2 • ±15kV using the IEC 1000-4-2 Air-Gap method Figure 1 shows the transmitter output when exiting shutdown mode. The transmitter is loaded with 3kΩ in 4 _______________________________________________________________________________________ ±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceiver MAX3314E Table 1. Shutdown Logic Truth Table SHDN TRANSMITTER OUTPUT RECEIVER OUTPUT L High Z Active H Active Active TIN TOUT ROUT 5V/div 0 SHDN TIN = GND 5µs/div 1.5V/div 0 Figure 3. Loopback Test Result at 120kbps TOUT TIN = VCC TIN 1µs/div Figure 1. Transmitter Outputs When Exiting Shutdown or Powering Up TOUT +5V ROUT 0.1µF VCC SHDN MAX3314E 2µs/div -5V V- Figure 4. Loopback Test Result at 250kbps 0.1µF TOUT TIN ROUT ESD Test Conditions ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results. RIN 5kΩ GND Figure 2. Loopback Test Circuit 1000pF Human Body Model Figure 5 shows the Human Body Model, and Figure 6 shows the current waveform it generates when discharged into low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a 1.5kΩ resistor. _______________________________________________________________________________________ 5 MAX3314E ±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceiver RC 1MΩ CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 100pF RC 50MΩ to 100MΩ RD 1500Ω CHARGE-CURRENT LIMIT RESISTOR DISCHARGE RESISTANCE DEVICE UNDER TEST STORAGE CAPACITOR HIGHVOLTAGE DC SOURCE Cs 150pF RD 330Ω DISCHARGE RESISTANCE STORAGE CAPACITOR DEVICE UNDER TEST Figure 7. IEC 1000-4-2 ESD Test Model Figure 5. Human Body ESD Test Model I IP 100% 90% Ir 100% PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) 90% AMPERES I PEAK 36.8% 10% 0 0 tRL TIME tDL CURRENT WAVEFORM 10% Figure 6. Human Body Current Waveform t r = 0.7ns to 1ns IEC 1000-4-2 The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifically refer to ICs. The MAX3314E helps design equipment that meets Level 4 (the highest level) of IEC 1000-4-2 without the need for additional ESD-protection components. The major difference between tests done using the Human Body Model and IEC 1000-4-2 is higher peak current in IEC 1000-4-2 because series resistance is lower in the IEC 1000-4-2 model. Hence, the ESD withstand voltage measured to IEC 1000-4-2 is generally lower than that measured using the Human Body Model. Figure 7 shows the IEC 1000-4-2 model, and Figure 8 shows the current waveform for the 8kV, IEC 1000-4-2, Level 4, ESD Contact Discharge test. The Air-Gap test involves approaching the device with a charged probe. The Contact Discharge method connects the probe to the device before the probe is energized. t 30ns 60ns Figure 8. IEC 1000-4-2 ESD Generator Current Waveform contact that occurs with handling and assembly during manufacturing. Of course, all pins require this protection during manufacturing, not just RS-232 inputs and outputs. Therefore, after PC board assembly, the Machine Model is less relevant to I/O ports. Chip Information TRANSISTOR COUNT: 128 Machine Model The Machine Model for ESD tests all pins using a 200pF storage capacitor and zero discharge resistance. Its objective is to emulate the stress caused by 6 _______________________________________________________________________________________ ±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceiver SOT23, 8L.EPS 8LUMAXD.EPS _______________________________________________________________________________________ 7 MAX3314E Package Information ±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceiver SOICN.EPS MAX3314E Package Information (continued) Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.