19-2671; Rev 0; 10/02 ±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters Features ♦ Meet TIA/EIA-422-B (RS-422) and ITU-T V.11 Recommendation ♦ ±15kV ESD Protection on Tx Outputs ♦ Hot-Swap Functionality ♦ Guaranteed 20Mbps Data Rate (MAX3030E, MAX3032E) ♦ Slew-Rate-Controlled 2Mbps Data Rate (MAX3031E, MAX3033E) ♦ Available in 16-Pin TSSOP and Narrow SO Packages ♦ Low-Power Design (<330µW, VCC = 3.3V Static) ♦ +3.3V Operation ♦ Industry-Standard Pinout ♦ Thermal Shutdown Applications Ordering Information Telecom Backplanes PART TEMP RANGE PIN-PACKAGE 0°C to +70°C 16 SO (Narrow) MAX3030ECUE 0°C to +70°C 16 TSSOP MAX3030EESE -40°C to +85°C 16 SO (Narrow) MAX3030EEUE -40°C to +85°C 16 TSSOP MAX3031ECSE 0°C to +70°C 16 SO (Narrow) MAX3031ECUE 0°C to +70°C 16 TSSOP MAX3031EESE -40°C to +85°C MAX3031EEUE -40°C to +85°C MAX3032ECSE 0°C to +70°C 16 SO (Narrow) MAX3032ECUE 0°C to +70°C 16 TSSOP 14 DO4+ MAX3032EESE -40°C to +85°C 13 DO4- MAX3032EEUE -40°C to +85°C 12 EN3&4 MAX3033ECSE 0°C to +70°C 16 SO (Narrow) 16 TSSOP V.11/X.21 Interface MAX3030ECSE Industrial PLCs Motor Control Pin Configurations TOP VIEW DI1 1 16 VCC DI1 1 16 VCC DO1+ 2 15 DI4 DO1+ 2 15 DI4 DO1- 3 EN 4 DO2- 5 MAX3030E/ MAX3031E 14 DO4+ DO1- 3 13 DO4- EN1&2 4 MAX3032E/ MAX3033E 16 SO (Narrow) 16 TSSOP 16 SO (Narrow) 16 TSSOP 12 EN DO2- 5 DO2+ 6 11 DO3- DO2+ 6 11 DO3- MAX3033ECUE 0°C to +70°C DI2 7 10 DO3+ DI2 7 10 DO3+ MAX3033EESE -40°C to +85°C 16 SO (Narrow) MAX3033EEUE -40°C to +85°C 16 TSSOP GND 8 9 TSSOP/SO DI3 GND 8 9 DI3 TSSOP/SO ________________________________________________________________ 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 MAX3030E–MAX3033E General Description The MAX3030E–MAX3033E family of quad RS-422 transmitters send digital data transmission signals over twisted-pair balanced lines in accordance with TIA/EIA422-B and ITU-T V.11 standards. All transmitter outputs are protected to ±15kV using the Human Body Model. The MAX3030E–MAX3033E are available with either a 2Mbps or 20Mbps guaranteed baud rate. The 2Mbps baud rate transmitters feature slew-rate-limiting to minimize EMI and reduce reflections caused by improperly terminated cables. The 20Mbps baud rate transmitters feature low-static current consumption (ICC < 100µA), making them ideal for battery-powered and power-conscious applications. They have a maximum propagation delay of 16ns and a part-to-part skew less than 5ns, making these devices ideal for driving parallel data. The MAX3030E– MAX3033E feature hot-swap capability that eliminates false transitions on the data cable during power-up or hot insertion. The MAX3030E–MAX3033E are low-power, ESD-protected, pin-compatible upgrades to the industry-standard 26LS31 and SN75174. They are available in space-saving 16-pin TSSOP and SO packages. MAX3030E–MAX3033E ±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters ABSOLUTE MAXIMUM RATINGS (All Voltages Are Referenced to Device Ground, Unless Otherwise Noted) VCC ........................................................................................+6V EN1&2, EN3&4, EN, EN............................................-0.3V to +6V DI_ ............................................................................-0.3V to +6V DO_+, DO_- (normal condition) .................-0.3V to (VCC + 0.3V) DO_+, DO_- (power-off or three-state condition).....-0.3V to +6V Driver Output Current per Pin.........................................±150mA Continuous Power Dissipation (TA = +70°C) 16-Pin SO (derate 8.70mW/°C above +70°C)..............696mW 16-Pin TSSOP (derate 9.40mW/°C above +70°C) .......755mW Operating Temperature Ranges MAX303_EC_ ......................................................0°C to +70°C MAX303_EE_ ...................................................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +160°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. DC ELECTRICAL CHARACTERISTICS (3V ≤ VCC ≤ 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DRIVER OUTPUT: DO_+, DO_VOD1 RL = 100Ω, Figure 1 VOD2 RL = ∞, Figure 1 3.6 VOD3 RL = 3.9kΩ (for compliance with V.11), Figure 1 3.6 Change in Differential Output Voltage ∆VOD RL = 100Ω (Note 2) Driver Common-Mode Output Voltage VOC RL = 100Ω, Figure 1 Change in Common-Mode Voltage ∆VOC RL = 100Ω (Note 2) Differential Driver Output Three-State Leakage Current IOZ VOUT = VCC or GND, driver disabled Output Leakage Current IOFF VCC = 0V, VOUT = 3V or 6V Driver Output Short-Circuit Current ISC VOUT = 0V, VIN = VCC or GND (Note 3) 2.0 -0.4 -0.4 V +0.4 V 3 V +0.4 V ±10 µA 20 µA -150 mA INPUTS: EN, EN, EN1&2, EN3&4 Input High Voltage VIH Input Low Voltage VIL Input Current Hot-Swap Driver Input Current 2.0 V ILEAK IHOTSWAP EN, EN, EN1&2, EN3&4 (Note 4) 0.4 V ±2 µA ±200 µA 100 µA SUPPLY CURRENT Supply Current ICC No load THERMAL PROTECTION Thermal-Shutdown Threshold TSH Thermal-Shutdown Hysteresis ESD Protection DO_ 2 Human Body Model 160 °C 10 °C ±15 kV _______________________________________________________________________________________ ±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters (3V ≤ VCC ≤ 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) PARAMETER SYMBOL Driver Propagation Delay Low to High tDPLH Driver Propagation Delay High to Low tDPHL CONDITIONS MIN TYP MAX UNITS 8 16 ns RL = 100Ω, CL = 50pF (10% to 90%), Figures 2, 3 10 ns RL = 100Ω, CL = 50pF, VCC = 3.3V ±2 ns RL = 100Ω, CL = 50pF, VCC = 3.3V, ∆TMAX = +5°C 5 ns RL = 100Ω, CL = 50pF, Figures 2, 3 Differential Transition Time, Low to High tR Differential Transition Time, High to Low tF Differential Skew (Same Channel) |tDPLH - tDPHL| tSK1 Skew Driver to Driver (Same Device) tSK2 Skew Part to Part tSK3 Maximum Data Rate 20 Mbps Driver Enable to Output High tDZH S2 closed, RL = 500Ω, CL = 50pF, Figures 4, 5 50 ns Driver Enable to Output Low tDZL S1 closed, RL = 500Ω, CL = 50pF, Figures 4, 5 50 ns Driver Disable Time from Low tDLZ S1 closed, RL = 500Ω, CL = 50pF, Figures 4, 5 50 ns Driver Disable Time from High tDHZ S2 closed, RL = 500Ω, CL = 50pF, Figures 4, 5 50 ns TYP MAX UNITS 40 70 ns 50 ns ±10 ns SWITCHING CHARACTERISTICS—MAX3031E, MAX3033E (3V ≤ VCC ≤ 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) PARAMETER SYMBOL Driver Propagation Delay Low to High tDPLH Driver Propagation Delay High to Low tDPHL Differential Transition Time, Low to High Differential Transition Time, High to Low CONDITIONS MIN RL = 100Ω, CL = 50pF, Figures 2, 3 tR RL = 100Ω, CL = 50pF (10% to 90%), Figures 2, 3 15 tF Differential Skew (Same Channel) |tDPLH - tDPHL| tSK1 Skew Driver to Driver (Same Device) tSK2 RL = 100Ω, CL = 50pF, VCC = 3.3V _______________________________________________________________________________________ 3 MAX3030E–MAX3033E SWITCHING CHARACTERISTICS—MAX3030E, MAX3032E SWITCHING CHARACTERISTICS—MAX3031E, MAX3033E (continued) (3V ≤ VCC ≤ 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) PARAMETER SYMBOL Skew Part to Part CONDITIONS MIN TYP RL = 100Ω, CL = 50pF, VCC = 3.3V, ∆TMAX = +5°C tSK3 Maximum Data Rate MAX UNITS 18 ns 2 Mbps Driver Enable to Output High tDZH S2 closed, RL = 500Ω, CL = 50pF, Figures 4, 5 100 ns Driver Enable to Output Low tDZL S1 closed, RL = 500Ω, CL = 50pF, Figures 4, 5 100 ns Driver Disable Time from Low tDLZ S1 closed, RL = 500Ω, CL = 50pF, Figures 4, 5 150 ns Driver Disable Time from High tDHZ S2 closed, RL = 500Ω, CL = 50pF, Figures 4, 5 150 ns Note 1: All currents into the device are positive; all currents out of the device are negative. All voltages are referenced to device ground, unless otherwise noted. Note 2: ∆VOD and ∆VOC are the changes in VOD and VOC, respectively, when DI changes state. Note 3: Only one output shorted at a time. Note 4: This input current is for the hot-swap enable (EN_, EN, EN) inputs and is present until the first transition only. After the first transition, the input reverts to a standard high-impedance CMOS input with input current ILEAK. Typical Operating Characteristics (VCC = +3.3V and TA = +25°C, unless otherwise noted.) TA = 0°C 2 TA = +25°C TA = +85°C 1 OUTPUT CURRENT vs. TRANSMITTER OUTPUT HIGH VOLTAGE MAX3030E toc02 150 150 125 OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 3 100 50 100 75 50 25 0 0 0 30 60 90 OUTPUT CURRENT (mA) 4 200 MAX3030E toc01 4 OUTPUT CURRENT vs. TRANSMITTER OUTPUT LOW VOLTAGE MAX3030E toc03 DIFFERENTIAL OUTPUT VOLTAGE vs. OUTPUT CURRENT DIFFERENTIAL OUTPUT VOLTAGE (V) MAX3030E–MAX3033E ±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters 120 0 0 1 2 3 OUTPUT LOW VOLTAGE (V) 4 0 1 2 3 OUTPUT HIGH VOLTAGE (V) _______________________________________________________________________________________ 4 ±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters 60 TA = +25°C 40 TA = 0°C 20 2.0 15 10 2 3 4 NO RESISTIVE LOAD, CL = 200pF, ALL FOUR TRANSMITTERS SWITCHING 1.5 1.0 0.5 0 0 1 0 0.1k 1k 10k 100k 1M 10M 100M 0.1k 1k 10k 100k 1M SUPPLY VOLTAGE (V) DATA RATE (bps) DATA RATE (bps) MAX3030E/MAX3032E SUPPLY CURRENT vs. DATA RATE MAX3031E/MAX3033E SUPPLY CURRENT vs. DATA RATE MAX3030E DRIVER PROPAGATION DELAY (LOW TO HIGH) SUPPLY CURRENT (mA) ALL FOUR TRANSMITTERS LOADED AND SWITCHING RL = 100Ω, CL = 200pF 110 100 10M MAX3030E toc09 MAX3030E toc08 100 MAX3030E toc07 130 SUPPLY CURRENT (mA) 20 5 0 120 NO RESISTIVE LOAD, CL = 200pF, ALL FOUR TRANSMITTERS SWITCHING SUPPLY CURRENT (mA) 25 SUPPLY CURRENT (mA) TA = +85°C 2.5 MAX3030E toc05 DRIVERS ENABLED SUPPLY CURRENT (µA) 30 MAX3030E toc04 100 80 MAX3031E/MAX3033E SUPPLY CURRENT vs. DATA RATE MAX3030E/MAX3032E SUPPLY CURRENT vs. DATA RATE MAX3030E toc06 SUPPLY CURRENT vs. SUPPLY VOLTAGE MAX3030E–MAX3033E Typical Operating Characteristics (continued) (VCC = +3.3V and TA = +25°C, unless otherwise noted.) ALL FOUR TRANSMITTERS LOADED AND SWITCHING RL = 100Ω, CL = 200pF DI_ 1V/div 97 DIFFERENTIAL OUTPUT 2V/div 94 91 90 80 88 0.1k 1k 10k 100k 1M 10M 100M 0.1k 1k 10k 100k 1M DATA RATE (bps) DATA RATE (bps) MAX3030E DRIVER PROPAGATION DELAY (HIGH TO LOW) MAX3031E DRIVER PROPAGATION DELAY (LOW TO HIGH) MAX3030E toc10 10M 10ns/div MAX3031E DRIVER PROPAGATION DELAY (HIGH TO LOW) MAX3030E toc11 MAX3030E toc12 DI_ 1V/div DIFFERENTIAL OUTPUT 2V/div DIFFERENTIAL OUTPUT 2V/div DIFFERENTIAL OUTPUT 2V/div DI_ 1V/div DI_ 1V/div 10ns/div 20ns/div 20ns/div _______________________________________________________________________________________ 5 MAX3030E–MAX3033E ±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters Typical Operating Characteristics (continued) (VCC = +3.3V and TA = +25°C, unless otherwise noted.) ENABLE RESPONSE TIME MAX3033E EYE DIAGRAM MAX3030E toc13 MAX3030E toc14 ENABLE 1V/div DO_+ 1V/div DIFFERENTIAL OUTPUT 2V/div DO_1V/div 20ns/div 100ns/div Pin Description PIN MAX3030E/ MAX3031E MAX3032E/ MAX3033E 1, 7, 9, 15 1, 7, 9, 15 2, 6, 10, 14 2, 6, 10, 14 3, 5, 11, 13 3, 5, 11, 13 FUNCTION DI1, DI2, DI3, DI4 Transmitter Inputs. When the corresponding transmitter is enabled, a low on DI_ forces the noninverting output low and inverting output high. Similarly, a high on DI_ forces noninverting output high and inverting output low. DO1+, DO2+, Noninverting RS-422 Outputs DO3+, DO4+ DO1-, DO2-, DO3-, DO4- Inverting RS-422 Outputs Transmitter Enable Input: Active HIGH. Drive EN HIGH to enable all transmitters. When EN is HIGH, drive EN LOW to disable (three-state) all the transmitters. The transmitter outputs are high impedance when disabled. EN is hot-swap protected (see the Hot Swap section). 4 — EN 8 8 GND 12 — EN Transmitter Enable Input: Active LOW. Drive EN LOW to enable all transmitters. When EN is LOW, drive EN HIGH to disable all the transmitters. The transmitter outputs are high impedance when disabled. EN is hot-swap protected (see the Hot Swap section). EN1&2 Transmitter Enable Input for Channels 1 and 2. Drive EN1&2 HIGH to enable the corresponding transmitters. Drive EN1&2 LOW to disable the corresponding transmitters. The transmitter outputs are high impedance when disabled. EN1&2 is hotswap protected (see the Hot Swap section). Transmitter Enable Input for Channels 3 and 4. Drive EN3&4 HIGH to enable the corresponding transmitters. Drive EN3&4 LOW to disable the corresponding transmitters. The transmitter outputs are high impedance when disabled. EN3&4 is hotswap protected (see the Hot Swap section). — 6 NAME 4 — 12 EN3&4 16 16 VCC Ground Positive Supply; +3V ≤ VCC ≤ +3.6V. Bypass VCC to GND with a 0.1µF capacitor. _______________________________________________________________________________________ ±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters CL DI_+ DO_+ RL 2 VOD RL VOD DI_ VOC CL RL 2 DI_- DO_CL Figure 1. Differential Driver DC Test Circuit Figure 2. Differential Driver Propagation Delay and Transition Time Test Circuit 3V DI 1.5V 1.5V 0V tDPHL tDPLH 1/2 VO DO_VO DO_+ S1 RL OUTPUT UNDER TEST CL 1/2 VO VO VDIFF 0V -VO VCC S2 VDIFF = V (DO_+) - V (DO_-) 10% 90% 90% 10% tF tR ENABLE SIGNAL IS ONE OF THE POSSIBLE ENABLE CONFIGURATIONS (SEE TRUTH TABLE). tSKEW = |tDPLH - tDPHL| Figure 3. Differential Driver Propagation Delay and Transition Waveform Figure 4. Driver Enable/Disable Delays Test Circuit 3V EN 1.5V 1.5V 0V tDZL tDLZ VOL 1.5V OUTPUT NORMALLY LOW VOH OUTPUT NORMALLY HIGH VOL + 0.3V DI GND 1.5V DO_+ VCC DO_- A A VOH - 0.3V 0V tDZH tDHZ ENABLE SIGNAL IS ONE OF THE POSSIBLE ENABLE CONFIGURATIONS (SEE TRUTH TABLE). Figure 5. Driver Enable/Disable Waveform Figure 6. Short-Circuit Measurements _______________________________________________________________________________________ 7 MAX3030E–MAX3033E Test Circuits and Timing Diagrams MAX3030E–MAX3033E ±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters Test Circuits and Timing Diagrams (continued) VCC GND DO_+ DI DO_- transmitter outputs of this product family are characterized for protection to ±15kV using the Human Body Model. Other ESD test methodologies include IEC10004-2 Contact Discharge and IEC1000-4-2 AirGap Discharge (formerly IEC801-2). A A 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. Human Body Model Figure 7. Power-Off Measurements Detailed Description The MAX3030E–MAX3033E are high-speed quad RS422 transmitters designed for digital data transmission over balanced lines. They are designed to meet the requirements of TIA/EIA-422-B and ITU-T V.11. The MAX3030E–MAX3033E are available in two pinouts to be compatible with both the 26LS31 and SN75174 industry-standard devices. Both are offered in 20Mbps and 2Mbps baud rate. All versions feature a low-static current consumption (ICC < 100µA) that makes them ideal for battery-powered and power-conscious applications. The 20Mbps version has a maximum propagation delay of 16ns and a part-to-part skew less than 5ns, allowing these devices to drive parallel data. The 2Mbps version is slew-rate-limited to reduce EMI and reduce reflections caused by improperly terminated cables. Outputs have enhanced ESD protection providing ±15kV tolerance. All parts feature hot-swap capability that eliminates false transitions on the data cable during power-up or hot insertion. ±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 driver outputs and receiver inputs have extra protection against static electricity. Maxim’s engineers 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 and power-down. After an ESD event, the MAX3030E–MAX3033E keep working without latchup. ESD protection can be tested in various ways; the 8 Figure 8 shows the Human Body Model, and Figure 9 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. RC 1MΩ CHARGE-CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 100pF RD 1.5kΩ DISCHARGE RESISTANCE DEVICE UNDER TEST STORAGE CAPACITOR Figure 8. Human Body ESD Test Model IP 100% 90% Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) AMPS 36.8% 10% 0 0 tRL TIME tDL CURRENT WAVEFORM Figure 9. Human Body Current Waveform _______________________________________________________________________________________ ±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters MAX3030E–MAX3033E 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 contact that occurs with handling and assembly during manufacturing. Of course, all pins require this protection during manufacturing, not just inputs and outputs. Therefore, after PC board assembly, the Machine Model is less relevant to I/O ports. VCC 6µs TIMER TIMER Hot Swap When circuit boards are plugged into a “hot” backplane, there can be disturbances to the differential signal levels that could be detected by receivers connected to the transmission line. This erroneous data could cause data errors to an RS-422 system. To avoid this, the MAX3030E–MAX3033E have hot-swap capable inputs. When a circuit board is plugged into a “hot” backplane, there is an interval during which the processor is going through its power-up sequence. During this time, the processor’s output drivers are high impedance and are unable to drive the enable inputs of the MAX3030E– MAX3033E (EN, EN, EN_) to defined logic levels. Leakage currents from these high-impedance drivers, of as much as 10µA, could cause the enable inputs of the MAX3030E–MAX3033E to drift high or low. Additionally, parasitic capacitance of the circuit board could cause capacitive coupling of the enable inputs to either GND or V CC . These factors could cause the enable inputs of the MAX3030E–MAX3033E to drift to levels that may enable the transmitter outputs. To avoid this problem, the hot-swap input provides a method of holding the enable inputs of the MAX3030E–MAX3033E in the disabled state as VCC ramps up. This hot-swap input is able to overcome the leakage currents and parasitic capacitances that can pull the enable inputs to the enabled state. Hot-Swap Input Circuitry In the MAX3030E–MAX3033E, the enable inputs feature hot-swap capability. At the input there are two NMOS devices, M1 and M2 (Figure 10). When VCC is ramping up from zero, an internal 6µs timer turns on M2 and sets the SR latch, which also turns on M1. Transistors M2, a 2mA current sink, and M1, a 100µA current sink, pull EN to GND through a 5.6kΩ resistor. M2 is designed to pull the EN input to the disabled state against an external parasitic capacitance of up to 100pF that is trying to enable the EN input. After 6µs, the timer turns M2 off and M1 remains on, holding the EN input low against threestate output leakages that might enable EN. M1 remains on until an external source overcomes the required input 5.6kΩ DE (HOT SWAP) EN 100µA 2mA M1 M2 Figure 10. Simplified Structure of the Driver Enable Pin (EN) 3.3V VCC 1kΩ DO_+ DI_ (VCC OR GND) 0.1kΩ 50pF DO_1kΩ Figure 11. Differential Power-Up Glitch (Hot Swap) current. At this time the SR latch resets and M1 turns off. When M1 turns off, EN reverts to a standard, highimpedance CMOS input. Whenever VCC drops below 1V, the hot-swap input is reset. The EN1&2 and EN3&4 input structures are identical to the EN input. For the EN input, there is a complementary circuit employing two PMOS devices pulling the EN input to VCC. Hot-Swap Line Transient The circuit of Figure 11 shows a typical offset termination used to guarantee a greater than 200mV offset when a line is not driven. The 50pF capacitor repre- _______________________________________________________________________________________ 9 MAX3030E–MAX3033E ±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters sents the minimum parasitic capacitance that would exist in a typical application. In most cases, more capacitance exists in the system and reduces the magnitude of the glitch. During a “hot-swap” event when the driver is connected to the line and is powered up, the driver must not cause the differential signal to drop below 200mV (Figures 12 and 13). Operation of Enable Pins The MAX3032E/MAX3033E are compatible with the SN75174. EN1&2 controls transmitters 1 and 2, and EN 3&4 controls transmitters 3 and 4 (dual enable). Typical Applications The MAX3030E–MAX3033E offer optimum performance when used with the MAX3094E/MAX3096 3.3V quad differential line receivers. Figure 14 shows a typical RS422 connection for transmitting and receiving data. The MAX3030E–MAX3033E family has two enable-functional versions. The MAX3030E/MAX3031E are compatible with 26LS31, where the two enable signals control all four transmitters (global enable). VCC 1V/div VCC 1V/div DO_+ - DO_- DO_+ - DO_- DO_+ DO_+ DO_- DO_1.0µs/div 4µs/div Figure 12. Differential Power-Up Glitch (0.1V/µs) Figure 13. Differential Power-Up Glitch (1V/µs) Table 1. MAX3030E/MAX3031E Transmitter Controls EN EN 0 0 Active Active Active Active 0 1 High-Z High-Z High-Z High-Z All transmitters disabled 1 0 Active Active Active Active All transmitters active 1 1 Active Active Active Active All transmitters active TX1 TX2 TX3 TX4 MODE All transmitters active Table 2. MAX3032E/MAX3033E Transmitter Controls 10 EN1&2 EN3&4 TX1 TX2 TX3 TX4 0 0 0 1 1 1 MODE High-Z High-Z High-Z High-Z All transmitters disabled High-Z High-Z Active Active Tx 3 and 4 active 0 Active Active High-Z High-Z Tx 1 and 2 active 1 Active Active Active Active All transmitters active ______________________________________________________________________________________ ±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters MAX3094 DI1 D1 RT R1 R1OUT DI2 D2 RT R2 R2OUT DI3 D3 RT R3 R3OUT DI4 D4 RT R4 R4OUT EN G EN G VCC MAX3030E–MAX3033E MAX3030E/MAX3031E GND VCC GND Figure 14. Typical Connection of a Quad Transmitter and Quad Receiver as a Pair ______________________________________________________________________________________ 11 MAX3030E–MAX3033E ±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters VCC VCC GND GND EN1&2 EN EN EN3&4 DO1+ DI1 DO1- DO1+ DI1 DO1- DO2+ DI2 DO2- DO2+ DI2 DO2- DO3+ DI3 DO3- DO3+ DI3 DO3- DO4+ DI4 DO4- DO4+ DI4 DO4- MAX3030E/MAX3031E MAX3032E/MAX3033E Figure 15. MAX3030E/MAX3031E Functional Diagram Figure 16. MAX3032E/MAX3033E Functional Diagram Chip Information TRANSISTOR COUNT: 1050 PROCESS: BiCMOS 12 ______________________________________________________________________________________ ±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters N E H INCHES MILLIMETERS MAX MIN 0.069 0.053 0.010 0.004 0.014 0.019 0.007 0.010 0.050 BSC 0.150 0.157 0.228 0.244 0.016 0.050 MAX MIN 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 1.27 BSC 3.80 4.00 5.80 6.20 0.40 SOICN .EPS DIM A A1 B C e E H L 1.27 VARIATIONS: 1 INCHES TOP VIEW DIM D D D MIN 0.189 0.337 0.386 MAX 0.197 0.344 0.394 MILLIMETERS MIN 4.80 8.55 9.80 MAX 5.00 8.75 10.00 N MS012 8 AA 14 AB 16 AC D A B e C 0 -8 A1 L FRONT VIEW SIDE VIEW PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE, .150" SOIC APPROVAL DOCUMENT CONTROL NO. 21-0041 REV. B 1 1 ______________________________________________________________________________________ 13 MAX3030E–MAX3033E Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) TSSOP4.40mm.EPS MAX3030E–MAX3033E ±15kV ESD-Protected, 3.3V Quad RS-422 Transmitters 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. 14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.