MAX3224E/MAX3225E/ MAX3226E/MAX3227E/ E L AVAILAB MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus ________________General Description The MAX3224E/MAX3225E/MAX3226E/MAX3227E/ MAX3244E/MAX3245E are 3V-powered EIA/TIA-232 and V.28/V.24 communications interfaces with automatic shutdown/wakeup features, high data-rate capabilities, and enhanced electrostatic discharge (ESD) protection. All transmitter outputs and receiver inputs 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. All devices achieve a 1µA supply current using Maxim’s revolutionary AutoShutdown Plus™ feature. These devices automatically enter a low-power shutdown mode when the RS-232 cable is disconnected or the transmitters of the connected peripherals are inactive, and the UART driving the transmitter inputs is inactive for more than 30 seconds. They turn on again when they sense a valid transition at any transmitter or receiver input. AutoShutdown Plus saves power without changes to the existing BIOS or operating system. The MAX3225E/MAX3227E/MAX3245E also feature MegaBaud™ operation, guaranteeing 1Mbps for highspeed applications such as communicating with ISDN modems. The MAX3224E/MAX3226E/MAX3244E guarantee 250kbps operation. The transceivers have a proprietary low-dropout transmitter output stage enabling true RS-232 performance from a +3.0V to +5.5V supply with a dual charge pump. The charge pump requires only four small 0.1µF capacitors for operation from a 3.3V supply. The MAX3224E–MAX3227E feature a logiclevel output (READY) that asserts when the charge Functional Diagrams pump is regulating and the device is ready to begin transmitting. All devices are available in a space-saving TQFN, SSOP, and TSSOP (MAX3224E/MAX3225E/MAX3244E/ MAX3245E) packages. ________________________Applications Notebook, Subnotebook, and Palmtop Computers Cellular Phones Battery-Powered Equipment Hand-Held Equipment Peripherals Printers __Next Generation Device Features ♦ For Space-Constrained Applications: MAX3228E/MAX3229E: ±15kV ESD-Protected, +2.5V to +5.5V, RS-232 Transceivers in UCSP™ MAX3222E/MAX3232E/MAX3241E/MAX3246E: ±15kV ESD-Protected, Down to 10nA, +3.0V to +5.5V, Up to 1Mbps, True RS-232 Transceivers (MAX3246E Available in UCSP) ♦ For Low-Voltage or Data Cable Applications: MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins Ordering Information PART TEMP RANGE MAX3224ECTP+ 0°C to +70°C PIN-PACKAGE 20 TQFN-EP* MAX3224ECUP+ 0°C to +70°C 20 TSSOP MAX3224ECAP+ 0°C to +70°C 20 SSOP MAX3224ECPP+ 0°C to +70°C 20 Plastic DIP MAX3224EETP+ -40°C to +85°C 20 TQFN-EP* MAX3224EEUP+ -40°C to +85°C 20 TSSOP MAX3224EEAP+ -40°C to +85°C 20 SSOP MAX3224EEPP+ -40°C to +85°C 20 Plastic DIP MAX3224EAAP+ -40°C to +125°C 20 SSOP +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Ordering Information continued at end of data sheet. _____________________ Selector Guide PART NO. OF GUARANTEED READY DRIVERS/ DATA RATE OUTPUT RECEIVERS (bps) AutoShutdown Plus MAX3224E 2/2 250k ✔ ✔ MAX3225E MAX3226E MAX3227E 2/2 1/1 1/1 1M 250k 1M ✔ ✔ ✔ ✔ ✔ ✔ MAX3244E MAX3245E 3/5 3/5 250k 1M — — ✔ ✔ Pin Configurations appear at end of data sheet. Functional Diagrams continued at end of data sheet. AutoShutdown Plus, MegaBaud, and UCSP are trademarks of UCSP a trademark of Maxim Integrated Products, Inc. MaximisIntegrated Products, Inc. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com. 19-1339; Rev 10; 3/11 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus ABSOLUTE MAXIMUM RATINGS VCC to GND ..............................................................-0.3V to +6V 20-Pin TQFN (derate 21.3mW/°C above +70°C) ....1702.1mW V+ to GND (Note 1) ..................................................-0.3V to +7V 20-Pin Plastic DIP (derate 11.11mW/°C above +70°C) ...889mW V- to GND (Note 1) ...................................................+0.3V to -7V 20-Pin SSOP (derate 8.00mW/°C above +70°C) .........640mW V+ + ⏐V-⏐(Note 1) ................................................................+13V 20-Pin TSSOP (derate 10.9mW/°C above +70°C) .......879mW Input Voltages 28-Pin Wide SO (derate 12.5mW/°C above +70°C)............1W T_IN, FORCEON, FORCEOFF to GND ................ -0.3V to +6V 28-Pin SSOP (derate 9.52mW/°C above +70°C) .........762mW R_IN to GND ....................................................................±25V 28-Pin TSSOP (derate 12.8mW/°C above +70°C) .......1026mW Output Voltages 36-Pin TQFN (derate 26.3mW/°C above +70°C)...........2105mW T_OUT to GND.............................................................±13.2V Operating Temperature Ranges R_OUT, INVALID, READY to GND .........-0.3V to (VCC + 0.3V) MAX32_ _EC_ _ .................................................0°C to +70°C Short-Circuit Duration MAX32_ _EE_ _................................................-40°C to +85°C T_OUT to GND .......................................................Continuous MAX32_ _EAA_ ..............................................-40°C to +125°C Continuous Power Dissipation (TA = +70°C) Storage Temperature Range .............................-65°C to +160°C 16-Pin SSOP (derate 7.14mW/°C above +70°C) .........571mW Lead Temperature (soldering, 10s) .................................+300°C 16-Pin TSSOP (derate 9.4mW/°C above +70°C) ......754.7mW Soldering Temperature (reflow) .......................................+260°C 16-Pin TQFN (derate 20.8mW/°C above +70°C) ....1666.7mW 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. ELECTRICAL CHARACTERISTICS (VCC = +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS (VCC = 3.3V or 5.0V, TA = +25°C) Supply Current, AutoShutdown Plus FORCEON = GND, FORCEOFF = VCC, all R_IN idle, all T_IN idle 1 10 µA Supply Current, Shutdown FORCEOFF = GND 1 10 µA Supply Current, AutoShutdown Plus Disabled FORCEON = FORCEOFF = VCC, no load 0.3 1 mA 0.8 V LOGIC INPUTS AND RECEIVER OUTPUTS Input Logic Threshold Low T_IN, FORCEON, FORCEOFF Input Logic Threshold High T_IN, FORCEON, FORCEOFF VCC = 3.3V 2 VCC = 5.0V 2.4 Transmitter Input Hysteresis V 0.5 V T_IN, FORCEON, FORCEOFF ±0.01 ±1 µA Output Leakage Current R_OUT (MAX3244E/MAX3245E), receivers disabled ±0.05 ±10 µA Output Voltage Low IOUT = 1.6mA 0.4 V Output Voltage High IOUT = -1.0mA Input Leakage Current VCC - 0.6 VCC - 0.1 V RECEIVER INPUTS Input Voltage Range -25 Input Threshold Low TA = +25°C Input Threshold High TA = +25°C 0.6 1.2 VCC = 5.0V 0.8 1.5 1.5 2.4 VCC = 5.0V 1.8 2.4 2 0.5 TA = +25°C 3 5 V V VCC = 3.3V Input Hysteresis Input Resistance +25 VCC = 3.3V V V 7 kΩ Maxim Integrated MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus ELECTRICAL CHARACTERISTICS (continued) (VCC = +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS TRANSMITTER OUTPUTS Output Voltage Swing All transmitter outputs loaded with 3kΩ to ground ±5 ±5.4 V Output Resistance VCC = V+ = V- = 0V, transmitter outputs = ±2V 300 10M Ω Output Short-Circuit Current VCC = 0V or 3V to 5.5V, VOUT = ±12V, Transmitters disabled Output Leakage Current ±60 mA ±25 µA MOUSE DRIVEABILITY (MAX3244E/MAX3245E) T1IN = T2IN = GND, T3IN = VCC, T3OUT loaded with 3kΩ to GND, T1OUT and T2OUT loaded with 2.5mA each Transmitter Output Voltage ±5 V ESD PROTECTION IEC 1000-4-2 Air Discharge R_IN, T_OUT ±15 IEC 1000-4-2 Contact Discharge ±8 Human Body Model ±15 kV AutoShutdown Plus (FORCEON = GND, FORCEOFF = VCC) Receiver Input Threshold to INVALID Output High Figure 4a Receiver Input Threshold to INVALID Output Low Figure 4a INVALID, READY Output Voltage Low (MAX3224E–MAX3227E) IOUT = -1.6mA INVALID, READY Output Voltage High (MAX3224E–MAX3227E) IOUT = -1.0mA Positive threshold Negative threshold 2.7 -2.7 -0.3 V +0.3 V 0.4 V VCC - 0.6 V Receiver Positive or Negative Threshold to INVALID High tINVH VCC = 5V, Figure 4b 1 µs Receiver Positive or Negative Threshold to INVALID Low tINVL VCC = 5V, Figure 4b 30 µs Receiver or Transmitter Edge to Transmitters Enabled tWU VCC = 5V, Figure 5b (Note 2) 100 µs Receiver or Transmitter Edge to tAUTOSHDN VCC = 5V, Figure 5b (Note 2) Transmitters Shutdown Maxim Integrated 15 30 60 s 3 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus TIMING CHARACTERISTICS—MAX3224E/MAX3226E/MAX3244E (VCC = +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL tPHL tPLH Receiver Output Enable Time Receiver Output Disable Time Transmitter Skew Receiver Skew MIN RL = 3kΩ, CL = 1000pF, one transmitter switching Maximum Data Rate Receiver Propagation Delay CONDITIONS ⏐ tPHL - tPLH ⏐ ⏐ tPHL - tPLH ⏐ MAX 250 UNITS kbps 0.15 R_IN to R_OUT, CL = 150pF µs 0.15 Normal operation (MAX3244E only) 200 ns Normal operation (MAX3244E only) 200 ns (Note 3) 100 ns 50 ns VCC = 3.3V, TA = +25°C, RL = 3kΩ to 7kΩ, measured from +3V to -3V or -3V to +3V, one transmitter switching Transition-Region Slew Rate TYP CL = 150pF to 1000pF 6 30 V/µs TIMING CHARACTERISTICS—MAX3225E/MAX3227E/MAX3245E (VCC = +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL Maximum Data Rate Receiver Propagation Delay tPHL tPLH CONDITIONS MIN RL = 3kΩ, CL = 1000pF, one transmitter switching 250 VCC = 3.0V to 4.5V, RL = 3kΩ, CL = 250pF, one transmitter switching 1000 VCC = 4.5V to 5.5V, RL = 3kΩ, CL = 1000pF, one transmitter switching 1000 R_IN to R_OUT, CL = 150pF TYP MAX kbps 0.15 µs 0.15 Receiver Output Enable Time Normal operation (MAX3245E only) 200 ns Receiver Output Disable Time Normal operation (MAX3245E only) 200 ns (Note 3) 25 ns 50 ns Transmitter Skew Receiver Skew ⏐ tPHL - tPLH ⏐ ⏐ tPHL - tPLH ⏐ VCC = 3.3V, TA = +25°C, RL = 3kΩ to 7kΩ, CL = 150pF to 1000pF, Transition-Region Slew Rate 24 150 measured from +3V to -3V or -3V to +3V, one transmitter switching Note 2: A transmitter/receiver edge is defined as a transition through the transmitter/receiver input logic thresholds. Note 3: Transmitter skew is measured at the transmitter zero cross points. 4 UNITS V/µs Maxim Integrated MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus __________________________________________Typical Operating Characteristics (VCC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and CL, TA = +25°C, unless otherwise noted.) 12 -SLEW 10 +SLEW 8 6 40 4 -3 -4 -5 -6 VOUT3000 4000 5000 0 1000 2000 3000 4000 0 5000 4000 -SLEW 50 +SLEW 40 30 80 1 TRANSMITTER AT 1Mbps 1 TRANSMITTER AT 62.5kbps (MAX3225E) 1500 2000 2500 500 LOAD CAPACITANCE (pF) MAX3225E/MAX3227E TRANSMITTER SKEW vs. LOAD CAPACITANCE 30 25 20 AVERAGE: 10 PARTS 15 2000 LOAD CAPACITANCE (pF) Maxim Integrated 2500 3000 0 500 1000 1500 2000 MAX3224E–MAX3227E READY TURN-ON TIME vs. TEMPERATURE MAX3224E–MAX3227E READY TURN-OFF TIME vs. TEMPERATURE 28 26 20 1Mbps LOAD CAPACITANCE (pF) 30 0 30 2500 32 22 1.5Mbps 40 LOAD CAPACITANCE (pF) 34 5 1500 2000 36 24 1000 1500 38 10 500 1000 MAX3224-7/44/45E-08 1 TRANSMITTER AT 512kbps 1 TRANSMITTER AT 30kbps (MAX3225E) LOAD = 3kΩ + CL READY TURN-ON TIME (μs) MAX3224-7/44/45E-07 50 50 0 0 200 180 READY TURN-OFF TIME (ns) 1000 2Mbps 60 10 0 500 70 2500 MAX3224-7/44/45E-09 -7.5 1 TRANSMITTER AT FULL DATA RATE 1 TRANSMITTER AT 1/16 DATA RATE (MAX3225E) LOAD = 3kΩ + CL 90 20 10 MAX3224-7/44/45E-06 60 5000 100 SUPPLY CURRENT (mA) 70 SLEW RATE (V/μs) 1Mbps MAX3224-7/44/45E-05 MAX3224-7/44/45E-04 80 -5.0 0 3000 MAX3225E/MAX3227E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE 20 35 2000 MAX3225E/MAX3227E SLEW RATE vs. LOAD CAPACITANCE 1 TRANSMITTER AT FULL DATA RATE 1 TRANSMITTER AT 1/16 DATA RATE (MAX3225E) LOAD = 3kΩ + CL 1.5Mbps 1Mbps 2Mbps 40 1000 MAX3225E/MAX3227E TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE 1.5Mbps 45 T1 TRANSMITTING AT 250kbps T2 (MAX3224E) TRANSMITTING AT 15.6kbps LOAD CAPACITANCE (pF) 2.5 0 20kbps 15 LOAD CAPACITANCE (pF) 2Mbps -2.5 20 LOAD CAPACITANCE (pF) 5.0 0 120kbps 25 0 0 2000 30 5 FOR DATA RATES UP TO 250kbps 1000 250kbps 35 10 2 7.5 TRANSMITTER SKEW (ns) 45 MAX3224-7/44/45E-03 14 SLEW RATE (V/μs) T1 TRANSMITTING AT 250kbps T2 (MAX3224E) TRANSMITTING AT 15.6kbps 0 TRANSMITTER OUTPUT VOLTAGE (V) 16 SUPPLY CURRENT (mA) VOUT+ MAX3224-7/44/45E-02 6 5 4 3 2 1 0 -1 -2 MAX3224E/MAX3226E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE MAX3224E/MAX3226E SLEW RATE vs. LOAD CAPACITANCE MAX3224-7/44/45E-01 TRANSMITTER OUTPUT VOLTAGE (V) MAX3224E/MAX3226E TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE 160 140 120 100 80 60 40 20 0 -40 -20 0 20 40 60 TEMPERATURE (°C) 80 100 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) 5 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus _____________________________Typical Operating Characteristics (continued) (VCC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and CL, TA = +25°C, unless otherwise noted.) 10 8 6 4 1000 2000 3000 4000 0 1000 2000 3000 4000 0 1000 1.5Mbps 1Mbps 1 TRANSMITTER AT FULL DATA RATE 2 TRANSMITTERS AT 1/16 DATA RATE -2.5 2Mbps 3000 4000 5000 1.5Mbps 1Mbps MAX3224-7/44/45E-14 2Mbps 70 60 SLEW RATE (V/μs) 5.0 2.5 2000 LOAD CAPACITANCE (pF) MAX3245E SLEW RATE vs. LOAD CAPACITANCE MAX3224-7/44/45E-13 50 40 30 20 -5.0 10 1 TRANSMITTER AT 1Mbps 2 TRANSMITTERS AT 62.5kbps 0 -7.5 400 800 1200 1600 800 1200 1600 LOAD CAPACITANCE (pF) MAX3245E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE MAX3245E TRANSMITTER SKEW vs. LOAD CAPACITANCE MAX3224-7/44/45E-15 90 80 2Mbps 60 400 LOAD CAPACITANCE (pF) 100 70 0 2000 1.5Mbps 50 40 30 1Mbps 50 45 40 TRANSMITTER SKEW (ns) 0 2000 MAX3224-7/44/45E-16 TRANSMITTER OUTPUT VOLTAGE (V) 20kbps 20 LOAD CAPACITANCE (pF) 7.5 SUPPLY CURRENT (mA) 30 5000 MAX3245E TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE 35 30 25 20 15 10 20 1 TRANSMITTER AT FULL DATA RATE 2 TRANSMITTERS AT 1/16 DATA RATE 10 5 0 0 0 6 120kbps 0 5000 LOAD CAPACITANCE (pF) 0 250kbps 40 10 0 0 1 TRANSMITTER AT 250kbps 2 TRANSMITTERS AT 15.6kbps 50 2 VOUT- MAX3224-7/44/45E-12 MAX3224-7/44/45E-11 1 TRANSMITTER AT 250kbps 2 TRANSMITTERS AT 15.6kbps 12 60 SUPPLY CURRENT (mA) VOUT+ 0 -1 -2 -3 -4 -5 -6 14 MAX3224-7/44/45E-10 6 5 4 3 2 1 MAX3244E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE MAX3244E SLEW RATE vs. LOAD CAPACITANCE SLEW RATE (V/μs) TRANSMITTER OUTPUT VOLTAGE (V) MAX3244E TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE 400 800 1200 1600 2000 0 1000 2000 3000 Maxim Integrated MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus ______________________________________________________________ Pin Description PIN MAX3224E MAX3225E TQFN DIP/ SSOP/ TSSOP MAX3226E MAX3227E TQFN SSOP/ TSSOP MAX3244E MAX3245E SO/ SSOP/ TSSOP MAX3245E TQFN NAME FUNCTION Ready to Transmit Output, active-high. READY is enabled high when V- goes below -4V and the device is ready to transmit. 19 1 14 1 — — READY 1 2 16 2 28 31 C1+ 20 3 15 3 27 30 V+ +5.5V generated by the charge pump 2 4 1 4 24 26 C1- Negative Terminal of VoltageDoubler Charge-Pump Capacitor 3 5 2 5 1 33 C2+ Positive Terminal of Inverting Charge-Pump Capacitor 4 6 3 6 2 34 C2- Negative Terminal of Inverting Charge-Pump Capacitor 5 7 4 7 3 35 V- -5.5V Generated by the Charge Pump 6, 15 8, 17 10 13 9, 10, 11 7, 8, 9 T_OUT 7, 14 9, 16 5 8 4-8 1-5 R_IN 15-19 15, 16, 17, 19, 20 R_OUT TTL/CMOS Receiver Outputs 8, 13 10, 15 6 9 Positive Terminal of VoltageDoubler Charge-Pump Capacitor RS-232 Transmitter Outputs RS-232 Receiver Inputs 9 11 7 10 21 23 INVALID Valid Signal Detector Output, active low. A logic high indicates that a valid RS-232 level is present on a receiver input. 10, 11 12, 13 8 11 12-14 11, 12, 13 T_IN TTL/CMOS Transmitter Inputs Maxim Integrated 7 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Pin Description (continued) PIN MAX3224E MAX3225E TQFN DIP/ SSOP/ TSSOP MAX3226E MAX3227E TQFN SSOP/ TSSOP MAX3244E MAX3245E SO/ SSOP/ TSSOP NAME FUNCTION Force-On Input, Active High. Drive high to override AutoShutdown Plus, keeping transmitters and receivers on (FORCEOFF must be high) (Table 1). 12 14 9 12 23 25 FORCEON 16 18 11 14 25 27 GND Ground 17 19 12 15 26 29 VCC +3.0V to +5.5V Single Supply Voltage Force-Off Input, Active Low. Drive low to shut down transmitters, receivers (except R2OUTB), and charge pump. This overrides AutoShutdown Plus and FORCEON (Table 1). 18 20 13 16 22 24 FORCEOFF — — — — 20 21 R2OUTB — — — — — 6, 10, 14, 18, 22, 28, 32, 36 N.C. No Connection. Not internally connected. — — — — — — EP Exposed Pad. Solder the exposed pad to the ground plane or leave unconnected. _______________Detailed Description Dual Charge-Pump Voltage Converter The MAX3224E–MAX3227E/MAX3244E/MAX3245E’s internal power supply consists of a regulated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump), over the +3.0V to +5.5V range. The charge pump operates in discontinuous mode: if the output voltages are less than 5.5V, the charge pump is 8 MAX3245E TQFN TTL/CMOS Noninverting Complementary Receiver Outputs. Always active. enabled; if the output voltages exceed 5.5V, the charge-pump is disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies. The READY output (MAX3224E–MAX3227E) is low when the charge pumps are disabled in shutdown mode. The READY signal asserts high when V- goes below -4V. Maxim Integrated MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus POWERMANAGEMENT UNIT OR KEYBOARD CONTROLLER VCC FORCEOFF FORCEON INVALID PROTECTION DIODE MAX3244E MAX3245E PREVIOUS RS-232 VCC I Rx 5kΩ UART Tx CPU GND I/O CHIP WITH UART SHDN = GND RS-232 a) OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM ACTIVE RECEIVER OUTPUT IN SHUTDOWN. VCC TO μP LOGIC TRANSITION DETECTOR Figure 1. Interface Under Control of PMU I PROTECTION DIODE RS-232 Transmitters The transmitters are inverting level translators that convert CMOS-logic levels to 5.0V EIA/TIA-232 levels. The MAX3224E/MAX3226E/MAX3244E guarantee a 250kbps data rate (1Mbps, for the MAX3225E/MAX3227E/ MAX3245E) with worst-case loads of 3kΩ in parallel with 1000pF, providing compatibility with PC-to-PC communication software (such as LapLink®). Transmitters can be paralleled to drive multiple receivers. Figure 1 shows a complete system connection. When FORCEOFF is driven to ground or when the AutoShutdown Plus circuitry senses that all receiver and transmitter inputs are inactive for more than 30s, the transmitters are disabled and the outputs go into a highimpedance state. When powered off or shut down, the outputs can be driven to ±12V. The transmitter inputs do not have pullup resistors. Connect unused inputs to GND or VCC. MAX3244E MAX3245E R2OUTB VCC Rx UART 5kΩ Tx GND b) R2IN R2OUT THREE-STATED T1IN T1OUT FORCEOFF = GND NEW MAX3244E/MAX3245E: IN SHUTDOWN, R2OUTB IS USED TO MONITOR EXTERNAL DEVICES AND R2OUT IS THREE STATED, ELIMINATING A CURRENT PATH THROUGH THE UART'S PROTECTION DIODE. Figure 2. The MAX3244E/MAX3245E detect RS-232 activity when the UART and interface are shut down. LapLink is a registered trademark of Laplink Software, Inc. Maxim Integrated 9 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Table 1. Output Control Truth Table RECEIVER OR TRANSMITTER EDGE WITHIN 30s T_OUT R_OUT (MAX3224E/ MAX3225E/ MAX3226E/ MAX3227E) R_OUT (MAX3244E/ MAX3245E) R2OUTB (MAX3244E/ MAX3245E) FORCEON FORCEOFF VALID RECEIVER LEVEL Shutdown (Forced Off) X 0 X X High-Z Active High-Z Active Normal Operation (Forced On) 1 1 X X Active Active Active Active Normal Operation (AutoShutdown Plus) 0 1 X Yes Active Active Active Active Shutdown (AutoShutdown Plus) 0 1 X No High-Z Active Active Active Normal Operation INVALID* 1 Yes X Active Active Active Active Normal Operation INVALID* 1 X Yes Active Active Active Active Shutdown INVALID* 1 No No High-Z Active Active Active Normal Operation (AutoShutdown) INVALID* INVALID** Yes X Active Active Active Active Shutdown (AutoShutdown) INVALID* INVALID** No X High-Z Active High-Z Active OPERATION STATUS X = Don’t care * INVALID connected to FORCEON ** INVALID connected to FORCEON and FORCEOFF RS-232 Receivers The receivers convert RS-232 signals to CMOS-logic output levels. The MAX3224E–MAX3227E feature inverting outputs that always remain active (Table 1). The MAX3244E/MAX3245E have inverting three-state outputs that are high impedance when shut down (FORCEOFF = GND) (Table 1). The MAX3244E/MAX3245E feature an extra, always active, noninverting output, R2OUTB. R2OUTB output monitors receiver activity while the other receivers are high impedance, allowing ring indicator applications to be monitored without forward biasing other devices connected to the receiver outputs. This is ideal for systems where V CC is set to ground in shutdown to accommodate peripherals such as UARTs (Figure 2). 10 The MAX3224E–MAX3227E/MAX3244E/MAX3245E feature an INVALID output that is enabled low when no valid RS-232 voltage levels have been detected on all receiver inputs. Because INVALID indicates the receiver input’s condition, it is independent of FORCEON and FORCEOFF states (Figures 3 and 4). AutoShutdown Plus Mode The MAX3224E–MAX3227E/MAX3244E/MAX3245E achieve a 1µA supply current with Maxim’s AutoShutdown Plus feature, which operates when FORCEOFF is high and a FORCEON is low. When these devices do not sense a valid signal transition on any receiver and transmitter input for 30s, the on-board charge pumps are shut down, reducing supply current to 1µA. This occurs if the RS-232 cable is disconnected or if the connected Maxim Integrated MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus +0.3V T_IN R_IN 30μs TIMER R -0.3V INVALID R_IN EDGE DETECT S 30s TIMER EDGE DETECT INVALID ASSERTED IF ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR AT LEAST 30μs. Figure 3a. INVALID Functional Diagram, INVALID Low FORCEOFF AUTOSHDN R FORCEON Figure 3c. AutoShutdown Plus Logic +2.7V FORCEOFF POWERDOWN* FORCEON 30μs TIMER R -2.7V INVALID INVALID DEASSERTED IF ANY RECEIVER INPUT HAS BEEN BETWEEN +2.7V AND -2.7V FOR LESS THAN 30μs. Figure 3b. INVALID Functional Diagram, INVALID High Table 2. INVALID Truth Table RS-232 SIGNAL PRESENT AT ANY RECEIVER INPUT INVALID OUTPUT Yes High No Low peripheral transmitters are turned off, and the UART driving the transmitter inputs is inactive. The system turns on again when a valid transition is applied to any RS-232 receiver or transmitter input. As a result, the system saves power without changes to the existing BIOS or operating system. Figures 3a and 3b depict valid and invalid RS-232 receiver voltage levels. INVALID indicates the receiver input’s condition, and is independent of FORCEON and FORCEOFF states. Figure 3 and Tables 1 and 2 summarize the operating modes of the MAX3224E– MAX3227E/MAX3244E/MAX3245E. FORCEON and FORCEOFF override AutoShutdown Plus circuitry. When neither control is asserted, the IC selects between these states automatically based on the last receiver or transmitter input edge received. Maxim Integrated AUTOSHDN * POWERDOWN IS ONLY AN INTERNAL SIGNAL. IT CONTROLS THE OPERATIONAL STATUS OF THE TRANSMITTERS AND THE POWER SUPPLIES. Figure 3d. Power-Down Logic When shut down, the device’s charge pumps turn off, V+ is pulled to VCC, V- is pulled to ground, the transmitter outputs are high impedance, and READY (MAX3224E–MAX3227E) is driven low. The time required to exit shutdown is typically 100µs (Figure 8). By connecting FORCEON to INVALID, the MAX3224E– MAX3227E/MAX3244E/MAX3245E shut down when no valid receiver level and no receiver or transmitter edge is detected for 30s, and wake up when a valid receiver level or receiver or transmitter edge is detected. INVALID HIGH +2.7V RECEIVER INPUT LEVELS R_IN INDETERMINATE +0.3V 0 INVALID LOW -0.3V INDETERMINATE -2.7V INVALID HIGH Figure 4a. Receiver Positive/Negative Thresholds for INVALID 11 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus RECEIVER INPUTS INVALID } REGION TRANSMITTER INPUTS TRANSMITTER OUTPUTS INVALID OUTPUT VCC tINVL 0 tINVH tAUTOSHDN tAUTOSHDN tWU tWU *VCC READY 0 V+ VCC 0 V- *MAX3224E–MAX3227E Figure 4b. AutoShutdown Plus, INVALID, and READY Timing Diagram By connecting FORCEON and FORCEOFF to INVALID, the MAX3224E–MAX3227E/MAX3244E/MAX3245E shut down when no valid receiver level is detected and wake up when a valid receiver level is detected (same functionality as AutoShutdown feature on MAX3221E/ MAX3223E/MAX3243E). A mouse or other system with AutoShutdown Plus may need time to wake up. Figure 5 shows a circuit that forces the transmitters on for 100ms, allowing enough time for the other system to realize that the MAX3244E/ MAX3245E is awake. If the other system outputs valid RS-232 signal transitions within that time, the RS-232 ports on both systems remain enabled. Software-Controlled Shutdown If direct software control is desired, use INVALID to indicate DTR or ring indicator signal. Tie FORCEOFF and FORCEON together to bypass the AutoShutdown Plus so the line acts like a SHDN input. discharges encountered during handling and assembly. The driver outputs and receiver inputs of the MAX3224E–MAX3227E/MAX3244E/MAX3245E have extra protection against static electricity. Maxim’s engineers have developed state-of-the-art structures to protect POWERMANAGEMENT UNIT MASTER SHDN LINE 0.1μF 1MΩ FORCEOFF FORCEON MAX3224E MAX3225E MAX3226E MAX3227E MAX3244E MAX3245E ±15kV ESD Protection As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic 12 Figure 5. AutoShutdown Plus Initial Turn-On to Wake Up a Mouse or Another System Maxim Integrated MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus RC 1MΩ CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 100pF RC 50MΩ to 100MΩ RD 1500Ω DISCHARGE RESISTANCE CHARGE CURRENT LIMIT RESISTOR DEVICE UNDER TEST STORAGE CAPACITOR Figure 6a. Human Body ESD Test Model HIGHVOLTAGE DC SOURCE Cs 150pF RD 330Ω DISCHARGE RESISTANCE STORAGE CAPACITOR DEVICE UNDER TEST Figure 7a. IEC 1000-4-2 ESD Test Model I IP 100% 90% Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) 100% 90% AMPERES I PEAK 36.8% 10% 0 0 tRL TIME tDL CURRENT WAVEFORM 10% Figure 6b. Human Body Current Waveform t r = 0.7ns to 1ns 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 RS-232 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 this product family are characterized for protection to the following limits: 1) ±15kV using the Human Body Model 2) ±8kV using the Contact-Discharge Method specified in IEC 1000-4-2 3) ±15kV using IEC 1000-4-2’s Air-Gap Method. Maxim Integrated t 30ns 60ns Figure 7b. IEC 1000-4-2 ESD Generator Current Waveform 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 6a shows the Human Body Model and Figure 6b shows the current waveform it generates when discharged into a 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. 13 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus IEC 1000-4-2 The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifically refer to integrated circuits. The MAX3224E–MAX3227E, MAX3244E/MAX3245E help you 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 7a shows the IEC 1000-4-2 model and Figure 7b shows the current waveform for the 8kV, IEC 1000-4-2, Level 4, ESD Contact-Discharge Method. The Air-Gap Method involves approaching the device with a charged probe. The Contact-Discharge Method connects the probe to the device before the probe is energized. 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 RS-232 inputs and outputs. Therefore, after PC board assembly, the Machine Model is less relevant to I/O ports. __________Applications Information Capacitor Selection The capacitor type used for C1–C4 is not critical for proper operation; polarized or nonpolarized capacitors Table 3. Required Minimum Capacitance Values 14 VCC (V) C1, CBYPASS (µF) C2, C3, C4 (µF) 3.0 to 3.6 0.22 0.22 3.15 to 3.6 0.1 0.1 4.5 to 5.5 0.047 0.33 3.0 to 5.5 0.22 1 5V/div 0 FORCEON = FORCEOFF T1OUT 2V/div 0 5V/div 0 T2OUT VCC = 3.3V C1–C4 = 0.1μF READY 5μs/div Figure 8. Transmitter Outputs when Exiting Shutdown or Powering Up can be used. The charge pump requires 0.1µF capacitors for 3.3V operation. For other supply voltages, see Table 3 for required capacitor values. Do not use values smaller than those listed in Table 3. Increasing the capacitor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consumption. C2, C3, and C4 can be increased without changing C1’s value. However, do not increase C1 without also increasing the values of C2, C3, C4, and CBYPASS, to maintain the proper ratios (C1 to the other capacitors). When using the minimum required capacitor values, make sure the capacitor value does not degrade excessively with temperature. If in doubt, use capacitors with a larger nominal value. The capacitor’s equivalent series resistance (ESR), which usually rises at low temperatures, influences the amount of ripple on V+ and V-. Power-Supply Decoupling In most circumstances, a 0.1µF VCC bypass capacitor is adequate. In applications that are sensitive to powersupply noise, use a capacitor of the same value as charge-pump capacitor C1. Connect bypass capacitors as close to the IC as possible. Transmitter Outputs when Exiting Shutdown Figure 8 shows two transmitter outputs when exiting shutdown mode. As they become active, the two transmitter outputs are shown going to opposite RS-232 levels (one transmitter input is high, the other is low). Each Maxim Integrated MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus transmitter is loaded with 3kΩ in parallel with 1000pF. The transmitter outputs display no ringing or undesirable transients as they come out of shutdown. Note that the transmitters are enabled only when the magnitude of V- exceeds approximately -3V. 5V/div T1IN High Data Rates The MAX3224E/MAX3226E/MAX3244E maintain the RS-232 ±5.0V minimum transmitter output voltage even at high data rates. Figure 9 shows a transmitter loopback test circuit. Figure 10 shows a loopback test result at 120kbps, and Figure 11 shows the same test at 250kbps. For Figure 10, all transmitters were driven simultaneously at 120kbps into RS-232 loads in parallel with 1000pF. For Figure 11, a single transmitter was driven at 250kbps, and all transmitters were loaded with an RS-232 receiver in parallel with 250pF. The MAX3225E/MAX3227E/MAX3245E maintain the RS-232 ±5.0V minimum transmitter output voltage at data rates up to 1Mbps (MegaBaud). Figure 12 shows a loopback test result with a single transmitter driven at 1Mbps and all transmitters loaded with an RS-232 receiver in parallel with 250pF. 5V/div T1OUT 5V/div R1OUT VCC = 3.3V 2μs/div Figure 10. MAX3224E/MAX3226E/MAX3244E Loopback Test Result at 120kbps T1IN 5V/div T1OUT 5V/div VCC 5V/div R1OUT CBYPASS VCC = 3.3V VCC C1+ C1 C1C2+ C2 C2- MAX3224E MAX3225E MAX3226E MAX3227E MAX3244E MAX3245E C4 5kΩ FORCEON GND Figure 11. MAX3224E/MAX3226E/MAX3244E Loopback Test Result at 250kbps V- R_ IN R_ OUT FORCEOFF C3* T_ OUT T_ IN VCC 2μs/div V+ T1IN 5V/div T1OUT 5V/div 1000pF 5V/div R1OUT VCC = 3.3V 200ns/div *C3 CAN BE RETURNED TO VCC OR GND. Figure 9. Loopback Test Circuit Maxim Integrated Figure 12. MAX3225E/MAX3227E/MAX3245E Loopback Test Result at 1Mbps 15 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus +3.3V 26 0.1μF 28 C1 0.1μF 24 1 C2 0.1μF 2 LOGIC INPUTS VCC 27 C1+ V+ C3 0.1μF C1C2+ MAX3244E MAX3245E COMPUTER SERIAL PORT 3 V- C4 0.1μF C2- 14 T1IN T1OUT 9 +V 13 T2IN T2OUT 10 +V 12 T3IN T3OUT 11 -V 20 R2OUTB 19 R1OUT GND R1IN 4 R2IN 5 R3IN 6 R4IN 7 R5IN 8 Tx 5kΩ 18 R2OUT LOGIC OUTPUTS 5kΩ 17 R3OUT RS-232 INPUTS 5kΩ 16 R4OUT 5kΩ 15 23 VCC TO POWERMANAGEMENT UNIT 22 21 R5OUT SERIAL MOUSE 5kΩ FORCEON FORCEOFF INVALID GND 25 Figure 13a. Mouse Driver Test Circuit 16 Maxim Integrated MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Mouse Driveability TRANSMITTER OUTPUT VOLTAGE (V) 5 4 3 VOUT+ VCC = 3.0V 2 1 The MAX3244E/MAX3245E are specifically designed to power serial mice while operating from low-voltage power supplies. They have been tested with leading mouse brands from manufacturers such as Microsoft and Logitech. The MAX3244E/MAX3245E successfully drove all serial mice tested and met their respective current and voltage requirements. The MAX3244E/ MAX3245E dual charge pump ensures the transmitters supply at least ±5V during worst-case conditions. Figure 13b shows the transmitter output voltages under increasing load current. Figure 13a shows a typical mouse connection. MAX2343E-FIG15 6 VOUT+ 0 -1 -2 VCC -3 -4 VOUTVOUT- -5 -6 0 1 2 3 4 5 6 7 8 9 10 Interconnection with 3V and 5V Logic LOAD CURRENT PER TRANSMITTER (mA) The MAX3224E–MAX3227E/MAX3244E/MAX3245E can directly interface with various 5V logic families, including ACT and HCT CMOS. See Table 4 for more information on possible combinations of interconnections. Figure 13b. MAX324_E Transmitter Output Voltage vs. Load Current per Transmitter Table 5 lists other Maxim ESD-powered transceivers. Table 4. Logic Family Compatibility with Various Supply Voltages SYSTEM POWER-SUPPLY VOLTAGE (V) VCC SUPPLY VOLTAGE (V) 3.3 3.3 5 5 5 3.3 COMPATIBILITY Compatible with all CMOS families Compatible with all TTL and CMOS families Compatible with ACT and HCT CMOS, and with AC, HC, or CD4000 CMOS Table 5. ±15kV ESD-Protected, 3.0V to 5.5V Powered RS-232 Transceivers from Maxim PART SUPPLY VOLTAGE RANGE (V) MAX3241E +3.0 to +5.5 3/5 300 — — ±15 ±8 ±15 250 MAX3243E +3.0 to +5.5 3/5 1 — Yes ±15 ±8 ±15 250 MAX3244E +3.0 to +5.5 3/5 1 Yes — ±15 ±8 ±15 250 MAX3245E +3.0 to +5.5 3/5 1 Yes — ±15 ±8 ±15 1Mbps MAX3232E +3.0 to +5.5 2/2 300 — — ±15 ±8 ±15 250 MAX3222E +3.0 to +5.5 2/2 300 — — ±15 ±8 ±15 250 MAX3223E +3.0 to +5.5 2/2 1 — Yes ±15 ±8 ±15 250 MAX3224E +3.0 to +5.5 2/2 1 Yes — ±15 ±8 ±15 250 MAX3225E +3.0 to +5.5 2/2 1 Yes — ±15 ±8 ±15 1Mbps MAX3221E +3.0 to +5.5 1/1 1 — Yes ±15 ±8 ±15 250 MAX3226E +3.0 to +5.5 1/1 1 Yes — ±15 ±8 ±15 250 MAX3227E +3.0 to +5.5 1/1 1 Yes — ±15 ±8 ±15 1Mbps Maxim Integrated NO. SUPPLY AutoAutoOF CURRENT Shutdown Shutdown Tx/Rx Plus (µA) Human Body Model (kV) IEC 1000-4-2 IEC 1000-4-2 GUARANTEED Contact Air-Gap DATA RATE Discharge Discharge (kbps) (kV) (kV) 17 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus ___________________________________________________Typical Operating Circuits +3.3V +3.3V 15 0.1μF CBYPASS 2 C1+ C1 0.1μF 4 5 C2 0.1μF 6 C1C2+ 3 V+ MAX3226E* MAX3227E V- 9 R1OUT C3 0.1μF C1 0.1μF C4 0.1μF C2 0.1μF 7 C2- 11 T1IN 12 READY AutoShutdown Plus 24 1 2 27 V+ C3 0.1μF C1C2+ MAX3244E*** MAX3245E V- 3 C4 0.1μF C2- 14 T1IN T1OUT 9 R1IN 8 13 T2IN T2OUT 10 12 T3IN T3OUT 11 INVALID 10 FORCEOFF 16 FORCEON 28 C1+ VCC T1OUT 13 5kΩ 1 26 CBYPASS 0.1μF VCC GND TO POWERMANAGEMENT UNIT VCC 22 FORCEOFF 23 FORCEON AutoShutdown Plus INVALID 21 20 R2OUTB 14 19 R1OUT R1IN 4 18 R2OUT R2IN 17 R3OUT R3IN 6 16 R4OUT R4IN 7 15 R5OUT R5IN 8 +3.3V CBYPASS C1 0.1μF 2 C1+ 4 C15 C2 0.1μF TTL/CMOS INPUTS 19 0.1μF 6 C2+ VCC 3 V+ MAX3224E** MAX3225E V- C3 0.1μF 7 C4 0.1μF C2- 13 T1IN T1OUT 17 12 T2IN T2OUT 8 RS-232 OUTPUTS GND R1IN 16 15 R1OUT TTL/CMOS OUTPUTS RS-232 INPUTS 5kΩ R2IN 10 R2OUT 5 25 9 5kΩ 1 14 READY AutoShutdown Plus INVALID 11 FORCEOFF 20 FORCEON GND TO POWERMANAGEMENT UNIT VCC *MAX3226E/MAX3227E PIN OUT REFERS TO SSOP/TSSOP PACKAGES. **MAX3224E/MAX3225E PIN OUT REFERS TO DIP/ SSOP/TSSOP PACKAGES. ***MAX3244E/MAX3245E PIN OUT REFERS TO SO/SSOP/TSSOP PACKAGES. 18 18 Maxim Integrated MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus ___________________________________________________________ Pin Configurations + + + READY 1 READY 1 16 FORCEOFF 20 FORCEOFF C2+ 1 28 C1+ C1+ 2 15 VCC C1+ 2 19 VCC C2- 2 27 V+ V+ 3 14 GND V+ 3 18 GND V- 3 26 VCC 17 T1OUT R1IN 4 25 GND 16 R1IN R2IN 5 15 R1OUT R3IN 6 14 FORCEON R4IN 7 22 FORCEOFF 8 13 T1IN R5IN 8 21 INVALID R2IN 9 12 T2IN T1OUT 9 20 R2OUTB 11 INVALID T2OUT 10 19 R1OUT T3OUT 11 18 R2OUT T3IN 12 17 R3OUT V- 7 12 FORCEON 11 T1IN C2- 6 V- 7 10 INVALID T2OUT 9 R1OUT R1IN 8 MAX3224E MAX3225E SSOP/TSSOP R1IN R1OUT FORCEON T1IN TOP VIEW T1OUT R2OUT 10 15 14 13 12 11 DIP/SSOP/TSSOP GND 16 10 T2IN VCC 17 9 INVALID 8 R2OUT 7 R2IN 6 T2OUT FORCEOFF 18 MAX3224E MAX3225E READY 19 24 C1- MAX3244E MAX3245E 23 FORCEON T2IN 13 16 R4OUT T1IN 14 15 R5OUT SO/SSOP/TSSOP TOP VIEW C2+ N.C. C1+ V+ VCC N.C. C2- 6 C1- 4 C2+ 5 N.C. C2+ 5 13 T1OUT VC2- MAX3226E MAX3227E C1- 4 36 35 34 33 32 31 30 29 28 *EP V+ 20 1 2 3 4 5 C1+ C1- C2+ C2- V- + 12 11 10 FORCEON T1OUT VCC TOP VIEW GND TQFN + 20 GND C1FORCEON FORCEOFF INVALID N.C. R2OUTB R1OUT 19 R2OUT R1IN R2IN 1 27 2 26 R3IN R4IN R5IN N.C. 3 25 T1OUT T2OUT T3OUT 7 4 24 5 23 MAX3245E 6 22 21 8 *EP 9 9 READY 14 7 INVALID 6 R1OUT 5 R1IN MAX3226E MAX3227E V+ 15 C1+ 16 *EP N.C. T1IN R3OUT 8 N.C. FORCEOFF 13 T3IN T2IN T1IN N.C. R5OUT R4OUT 10 11 12 13 14 15 16 17 18 TQFN C2+ 3 4 V- 2 C2- 1 C1- + TQFN Maxim Integrated *CONNECT EP TO GND. 19 MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Ordering Information (continued) PART TEMP RANGE PIN-PACKAGE MAX3225ECUP+ 0°C to +70°C 20 TSSOP MAX3225ECTP+ 0°C to +70°C 20 TQFN-EP* MAX3225ECAP+ 0°C to +70°C 20 SSOP MAX3225ECPP+ 0°C to +70°C 20 Plastic DIP MAX3225EETP+ -40°C to +85°C 20 TQFN -EP* MAX3225EEUP+ -40°C to +85°C 20 TSSOP MAX3225EEAP+ -40°C to +85°C 20 SSOP MAX3225EEPP+ -40°C to +85°C 20 Plastic DIP MAX3225EAAP+ -40°C to +125°C 20 SSOP Chip Information PROCESS: BICMOS Package Information For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 16 SSOP A16+2 21-0056 90-0106 MAX3226ECTE+ 0°C to +70°C 16 TQFN-EP* 16 TSSOP U16+1 21-0066 90-0117 MAX3226ECUE+ 0°C to +70°C 16 TSSOP 16 TQFN-EP T1655+2 21-0140 90-0072 MAX3226ECAE+ 0°C to +70°C 16 SSOP 20 DIP P20+3 21-0043 — MAX3226EEAE+ -40°C to +85°C 16 SSOP 20 SSOP A20+1 21-0056 90-0094 MAX3226EETE+ -40°C to +85°C 16 TQFN-EP* 20 TSSOP U20+2 21-0066 90-0116 MAX3226EEUE+ -40°C to +85°C 16 TSSOP 20 TQFN-EP T2055+5 21-0140 90-0010 MAX3226EAAE+ -40°C to +125°C 16 SSOP 28 Wide SO W28+6 21-0042 90-0109 MAX3227ECAE+ 0°C to +70°C 16 SSOP 28 SSOP A28+1 21-0056 90-0095 MAX3227ECTE+ 0°C to +70°C 16 TQFN-EP* 28 TSSOP U28+2 21-0066 90-0171 MAX3227ECUE+ 0°C to +70°C 16 TSSOP T3666+3 21-0141 90-0050 MAX3227EEAE+ -40°C to +85°C 16 SSOP MAX3227EEAE/V+ -40°C to +85°C 16 SSOP MAX3227EETE+ -40°C to +85°C 16 TQFN-EP* MAX3227EEUE+ -40°C to +85°C 16 TSSOP MAX3227EAAE+ -40°C to +125°C MAX3244ECWI+ 0°C to +70°C 28 Wide SO MAX3244ECAI+ 0°C to +70°C 28 SSOP 36 TQFN 16 SSOP MAX3244ECUI+ 0°C to +70°C MAX3244EEWI+ -40°C to +85°C 28 Wide SO 28 TSSOP MAX3244EEAI+ -40°C to +85°C 28 SSOP MAX3244EEUI+ -40°C to +85°C MAX3245ECWI+ 0°C to +70°C 28 Wide SO MAX3245ECAI+ 0°C to +70°C 28 SSOP MAX3245ECTX+ 0°C to +70°C 36 TQFN- EP* MAX3245EEAI+ -40°C to +85°C 28 SSOP MAX3245EEWI+ -40°C to +85°C 28 WIDE SO MAX3245EEUI+ -40°C to +85°C 28 TSSOP MAX3245EETX+ -40°C to +85°C 36 TQFN- EP* 28 TSSOP +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. /V denotes an automotive qualified part. 20 Maxim Integrated MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus Revision History REVISION NUMBER REVISION DATE 10 3/11 DESCRIPTION Added an automotive qualified part to the Ordering Information; changed all the parts listed in the Ordering Information to lead free PAGES CHANGED 1, 20 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. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 © Maxim Integrated 21 The Maxim logo and Maxim Integrated are trademarks of Maxim Integrated Products, Inc.