MAX3314EKA+T

19-1725; Rev 1a; 3/01 460kbps, 1µA, RS-232-Compatible Transceiver Features ♦ 1µA Low-Power Shutdown with Receiver Active ♦ 30µA Operating Supply Current ♦ 460kbps (min) Data Rate ♦ 8-Pin SOT23 Package ♦ RS-232-Compatible Levels Ordering Information Digital Cameras PART MAX3314CKA MAX3314CUA MAX3314CSA MAX3314EKA MAX3314EUA TEMP. RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 8 SOT23 8 µMAX 8 SO 8 SOT23 8 µMAX PDA MAX3314ESA -40°C to +85°C 8 SO ________________________Applications GPS POS Telecommunications Typical Operating Circuit Handy Terminals Set-Top Boxes +5V CBYPASS 0.1µF 1 VCC SHDN Pin Configuration MAX3314 V- 2 7 -5V 0.1µF TOP VIEW 4 TIN TOUT 5 3 ROUT VCC 1 8 GND 7 V- 3 6 RIN TIN 4 5 TOUT SHDN 2 RIN 6 5kΩ MAX3314 ROUT GND 8 SOT23/µMAX/SO CAPACITORS MAY BE POLARIZED OR UNPOLARIZED. ________________________________________________________________ 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 MAX3314 General Description The MAX3314 is a ±5V powered EIA/TIA-232-compatible interface. It has one transmitter and one receiver in a flow-through architecture. The transmitter has a lowdropout output stage providing minimum RS-232-compatible ±3.7V output levels while driving 3kΩ and 1000pf at 460kbps. Both +5V and -5V are supplied externally. The MAX3314 has a SHDN function that reduces supply current to 1µA. The transmitter is disabled and put into 3-state mode while the receiver remains active. The MAX3314 is available in 8-pin SOT23, µMAX and SO packages. MAX3314 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 MAX3314C_A.....................................................0°C to +70°C MAX3314E_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, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER DC CHARACTERISTICS SYMBOL CONDITIONS MIN TYP MAX UNITS 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 VOL IOUT = 1.6mA Output Voltage High VOH 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 Output Short-Circuit Current Output Leakage Current VOUT = ±12V, transmitter disabled Note 1: Not tested—guaranteed by design. 2 _______________________________________________________________________________________ V Ω ±60 mA 25 µA 460kbps, 1µA, RS-232-Compatible Transceiver (VCC = +5V, V- = -5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL Maximum Data Rate CONDITIONS MIN RL = 3kΩ, CL =1000pf, transmitter switching TYP UNITS 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 460 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 from -3V to +3V Transition Region Slew Rate Typical Operating Characteristics (VCC = +5V, V- = -5V, 250kbps data rate, transmitter loaded with 3kΩ and CL, TA = +25°C, unless otherwise noted.) SLEW RATE (V/us) 7 6 5 SLEW+ 4 3 2 1 0 20kbps/120kbps 2 1 0 -1 -2 -3 460kbps/250kbps 460kbps/250kbps 20kbps/120kbps 500 1000 1500 2000 2500 3000 MAX3314-03 5.0 250kbps 4.5 460kbps 4.0 3.5 3.0 2.5 2.0 1.5 1.0 -4 -5 20kbps 0.5 120kbps 0 -6 0 5.5 SUPPLY CURRENT (mA) 8 6 5 4 3 MAX3314-02 SLEW- TRANSMITTER OUTPUT VOLTAGE (V) MAX3314-01 9 SUPPLY CURRENT vs. LOAD CAPACITANCE TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE SLEW RATE vs. LOAD CAPACITANCE 0 500 LOAD CAPACITANCE (pF) 1000 1500 2000 2500 3000 0 500 1000 1500 2000 2500 3000 LOAD CAPACITANCE (pF) LOAD CAPACITANCE (pF) 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 ± 5% External Power Supply. Decouple with a 0.1µF capacitor to ground. RS-232-Compatible Transmitter Output RS-232-Compatible Receiver Input ±5% External Power Supply. Decouple with a 0.1µF capacitor to ground. Ground _______________________________________________________________________________________ 3 MAX3314 TIMING CHARACTERISTICS MAX3314 460kbps, 1µA, RS-232-Compatible Transceiver Detailed Description RS-232-Compatible Drivers The transmitter is an inverting level translator that converts CMOS-logic levels to 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 3-state mode. The transmitter input does not have a pull-up resistor. Connect to ground if unused. 5V/div 0 SHDN TIN = GND 1.5V/div 0 TOUT RS-232-Compatible Receivers TIN = VCC The MAX3314’s receiver converts RS-232 signals to CMOS-logic output levels. The receiver is rated to signals up to ±25V. The MAX3314’s receiver will remain active during shutdown mode. MAX3314 Shutdown Mode In shutdown mode, the transmitter output is put into high impedance. This reduces the supply current to 1µA. The time required to exit shutdown is less than 2.5µs. Table 1 is the shutdown logic truth table. Table 1. Shutdown Logic Truth Table SHDN TRANSMITTER OUTPUT RECEIVER OUTPUT L High-Z Active H Active Active 1µs/div Figure 1. Transmitter Output When Exiting Shutdown or Powering Up +5V 0.1µF VCC SHDN 0.1µF TOUT TIN Applications Information -5V V- MAX3314 ROUT RIN 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 Output When Exiting Shutdown Figure 1 shows the transmitter output when exiting shutdown mode. The transmitter is loaded with 3kΩ in parallel with 1000pF. The transmitter output displays no ringing or undesirable transients as the MAX3314 comes out of shutdown. Note that the transmitter is enabled only when the magnitude of V- exceeds approximately -3V. 5kΩ GND CAPACITORS MAY BE POLARIZED OR NONPOLARIZED. Figure 2. Loopback Test Circuit 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. Chip Information High Data Rates The MAX3314 maintains minimum RS-232-compatible ±3.7V transmitter output voltage even at high data rates. 4 1000pF TRANSISTOR COUNT: 128 _______________________________________________________________________________________ 460kbps, 1µA, RS-232-Compatible Transceiver Figure 3. Loopback Test Results at 120kbps TIN TOUT TOUT ROUT ROUT MAX3314 5µs/div TIN 2µs/div Figure 4. Loopback Test Results at 250kbps Package Information _______________________________________________________________________________________ 5 MAX3314 460kbps, 1µA, RS-232-Compatible Transceiver SOT23, 8L.EPS SOICN.EPS 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. 6 _____________________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.