19-1339; Rev 0; 1/98 ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus ____________________________Features ♦ ESD Protection for RS-232 I/O Pins: ±15kV—Human Body Model ±8kV—IEC1000-4-2, Contact Discharge ±15kV—IEC1000-4-2, Air-Gap Discharge 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 pump is regulating and the device is ready to begin transmitting. ♦ Guaranteed Data Rate: 250kbps (MAX3224E/3226E/3244E) 1Mbps (MAX3225E/3227E/3245E) All devices are available in a space-saving SSOP package. ________________________Applications ♦ Latchup Free ♦ 1µA Supply Current ♦ AutoShutdown Plus—EDN Innovation of the Year ♦ Guaranteed Slew Rate: 6V/µs (MAX3224E/3226E/3244E) 24V/µs (MAX3225E/3227E/3245E) ♦ Meets EIA/TIA-232 Specifications Down to 3.0V ♦ Guaranteed Mouse Driveability (MAX3244E/3245E) ♦ Ready-to-Transmit Logic-Level Output _______________Ordering Information PART TEMP. RANGE PIN-PACKAGE MAX3224ECPP 0°C to +70°C 20 Plastic DIP MAX3224ECAP MAX3224EEPP MAX3224EEAP 0°C to +70°C -40°C to +85°C -40°C to +85°C 20 SSOP 20 Plastic DIP 20 SSOP MAX3225ECPP MAX3225ECAP MAX3225EEPP MAX3225EEAP 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C 20 Plastic DIP 20 SSOP 20 Plastic DIP 20 SSOP Ordering Information continued at end of data sheet. Notebook, Subnotebook, and Palmtop Computers Cellular Phones _____________________ Selector Guide Battery-Powered Equipment Hand-Held Equipment PART Peripherals NO. OF GUARANTEED AUTOREADY DRIVERS/ DATA RATE SHUTDOWN OUTPUT RECEIVERS (bps) PLUS Printers MAX3224E AutoShutdown Plus and MegaBaud are trademarks of Maxim Integrated Products. †Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; 5,649,210; and other patents pending. 2/2 250k ✔ ✔ ✔ ✔ ✔ ✔ ✔ MAX3225E MAX3226E MAX3227E 2/2 1/1 1/1 1M 250k 1M ✔ ✔ ✔ MAX3244E MAX3245E 3/5 3/5 250k 1M — — ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. MAX3224E–MAX3227E/MAX3244E/MAX3245E † ________________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. MAX3224E–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 V+ to GND (Note 1) ..................................................-0.3V to +7V V- to GND (Note 1) ...................................................+0.3V to -7V V+ + V-(Note 1) ................................................................+13V Input Voltages T_IN, FORCEON, FORCEOFF to GND ................ -0.3V to +6V R_IN to GND ....................................................................±25V Output Voltages T_OUT to GND.............................................................±13.2V R_OUT, INVALID, READY to GND .........-0.3V to (VCC + 0.3V) Short-Circuit Duration T_OUT to GND .......................................................Continuous Continuous Power Dissipation (TA = +70°C) 16-Pin SSOP (derate 7.14mW/°C above +70°C) .........571mW 20-Pin Plastic DIP (derate 11.11mW/°C above +70°C) ...889mW 20-Pin SSOP (derate 8.00mW/°C above +70°C) .........640mW 28-Pin Wide SO (derate 12.5mW/°C above +70°C)........... 1W 28-Pin SSOP (derate 9.52mW/°C above +70°C) .........762mW Operating Temperature Ranges MAX32_ _EC_ _ .................................................0°C to +70°C MAX32_ _EE_ _................................................-40°C to +85°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10sec) .............................+300°C 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%; CL = 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 Input Leakage Current 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 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 ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus (VCC = +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; CL = 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 Output Resistance VCC = V+ = V- = 0, transmitter outputs = ±2V 300 10M Output Short-Circuit Current VCC = 0 or 3V to 5.5V, VOUT = ±12V, Transmitters disabled Output Leakage Current V Ω ±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 IEC1000-4-2 Air Discharge R_IN, T_OUT ±15 IEC1000-4-2 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 15 30 60 sec _______________________________________________________________________________________ 3 MAX3224E–MAX3227E/MAX3244E/MAX3245E † ELECTRICAL CHARACTERISTICS (continued) MAX3224E–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%; CL = 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 CONDITIONS MIN RL = 3kΩ, CL = 1000pF, one transmitter switching tPHL tPLH TYP MAX 250 kbps 0.15 R_IN to R_OUT, CL = 150pF UNITS µs 0.15 Receiver Output Enable Time Normal operation (MAX3244E only) 200 ns Receiver Output Disable Time Normal operation (MAX3244E only) 200 ns (Note 3) 100 ns 50 ns Transmitter Skew tPHL - tPLH Receiver Skew tPHL - tPLH VCC = 3.3V, TA = +25°C, RL = 3kΩ to 7kΩ, measured from +3V to -3V or -3V to +3V Transition-Region Slew Rate CL = 150pF to 1000pF 6 30 CL = 150pF to 2500pF 4 30 V/µs TIMING CHARACTERISTICS—MAX3225E/MAX3227E/MAX3245E (VCC = +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; CL = 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 TYP MAX kbps 0.15 R_IN to R_OUT, CL = 150pF UNITS 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 tPHL - tPLH Receiver Skew tPHL - tPLH Transition-Region Slew Rate VCC = 3.3V, TA = +25°C, RL = 3kΩ to 7kΩ, CL = 150pF to 1000pF, measured from +3V to -3V or -3V to +3V 24 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 _______________________________________________________________________________________ 150 V/µs ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus -1 -2 -3 -4 -5 -6 -SLEW 10 +SLEW 8 6 4 2000 3000 4000 1000 2000 3000 4000 5000 0 1000 2000 MAX3225E/MAX3227E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE 1 TRANSMITTER AT FULL DATA RATE 1 TRANSMITTER AT 1/16 DATA RATE (MAX3225E) LOAD = 3kΩ + CL 1.5Mbps 1Mbps 2Mbps MAX3224-7/44/45E-05 70 60 -SLEW 50 +SLEW 40 30 20 1 TRANSMITTER AT FULL DATA RATE 1 TRANSMITTER AT 1/16 DATA RATE (MAX3225E) LOAD = 3kΩ + CL 90 80 70 2Mbps 60 50 1.5Mbps 40 30 1Mbps 20 1 TRANSMITTER AT 1Mbps 1 TRANSMITTER AT 62.5kbps (MAX3225E) 10 10 0 1000 1500 2000 0 0 2500 500 35 30 25 20 AVERAGE; 10 PARTS 15 32 30 28 26 22 0 20 1000 1500 2000 LOAD CAPACITANCE (pF) 2500 3000 500 1000 1500 2000 MAX3224E–MAX3227E READY TURN-OFF TIME vs. TEMPERATURE 34 5 0 MAX3224E–MAX3227E READY TURN-ON TIME vs. TEMPERATURE 36 24 500 2500 LOAD CAPACITANCE (pF) 38 10 0 2000 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 1500 LOAD CAPACITANCE (pF) LOAD CAPACITANCE (pF) MAX3225E/MAX3227E TRANSMITTER SKEW vs. LOAD CAPACITANCE 1000 200 180 READY TURN-OFF TIME (ns) 500 2500 MAX3224-7/44/45E-09 -5.0 5000 100 SUPPLY CURRENT (mA) 1Mbps 80 SLEW RATE (V/µs) MAX3224-7/44/45E-04 1.5Mbps 40 4000 MAX3225E/MAX3227E SLEW RATE vs. LOAD CAPACITANCE 2.5 45 3000 MAX3225E/MAX3227E TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE 2Mbps 0 MAX3224-7/44/45E-03 T1 TRANSMITTING AT 250kbps T2 (MAX3224E) TRANSMITTING AT 15.6kbps LOAD CAPACITANCE (pF) -7.5 TRANSMITTER SKEW (ns) 20kbps 15 LOAD CAPACITANCE (pF) 5.0 -2.5 20 LOAD CAPACITANCE (pF) 7.5 0 120kbps 25 0 0 5000 30 5 FOR DATA RATES UP TO 250kbps 0 1000 250kbps 35 10 2 VOUT0 TRANSMITTER OUTPUT VOLTAGE (V) 12 40 MAX3224-7/44/45E-06 2 1 0 14 45 SUPPLY CURRENT (mA) T1 TRANSMITTING AT 250kbps T2 (MAX3224E) TRANSMITTING AT 15.6kbps MAX3224-7/44/45E-02 VOUT+ 16 SLEW RATE (V/µs) 6 5 4 3 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–MAX3227E/MAX3244E/MAX3245E † __________________________________________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.) _____________________________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 1.5Mbps 1Mbps 1 TRANSMITTER AT FULL DATA RATE 2 TRANSMITTERS AT 1/16 DATA RATE 2Mbps 3000 1.5Mbps 1Mbps MAX3224-7/44/45E-14 2Mbps -2.5 70 60 SLEW RATE (V/µs) 5.0 2.5 2000 50 40 30 20 -5.0 10 -7.5 1 TRANSMITTER AT 1Mbps 2 TRANSMITTERS AT 62.5kbps 0 400 800 1200 1600 2000 800 1200 1600 MAX3245E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE MAX3245E TRANSMITTER SKEW vs. LOAD CAPACITANCE 80 2Mbps 1.5Mbps 50 40 30 1Mbps 50 2000 MAX3224-7/44/45E-16 MAX3224-7/44/45E-15 90 60 400 LOAD CAPACITANCE (pF) 100 70 0 LOAD CAPACITANCE (pF) 45 40 TRANSMITTER SKEW (ns) 0 35 30 25 20 15 10 20 1 TRANSMITTER AT FULL DATA RATE 2 TRANSMITTERS AT 1/16 DATA RATE 10 5 0 0 0 400 800 1200 1600 LOAD CAPACITANCE (pF) 2000 4000 LOAD CAPACITANCE (pF) MAX3245E SLEW RATE vs. LOAD CAPACITANCE MAX3224-7/44/45E-13 TRANSMITTER OUTPUT VOLTAGE (V) 1000 LOAD CAPACITANCE (pF) 7.5 SUPPLY CURRENT (mA) 0 5000 MAX3245E TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE 6 20kbps 20 0 5000 LOAD CAPACITANCE (pF) 0 120kbps 30 0 0 250kbps 40 10 2 VOUT- 1 TRANSMITTER AT 250kbps 2 TRANSMITTERS AT 15.6kbps 50 SUPPLY CURRENT (mA) -1 -2 -3 -4 -5 -6 12 SLEW RATE (V/µs) 1 TRANSMITTER AT 250kbps 2 TRANSMITTERS AT 15.6kbps 60 MAX3224-7/44/45E-11 VOUT+ 2 1 0 14 MAX3224-7/44/45E-10 6 5 4 3 MAX3244E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE MAX3244E SLEW RATE vs. LOAD CAPACITANCE MAX3224-7/44/45E-12 MAX3244E TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE TRANSMITTER OUTPUT VOLTAGE (V) MAX3224E–MAX3227E/MAX3244E/MAX3245E † ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus 0 1000 2000 LOAD CAPACITANCE (pF) _______________________________________________________________________________________ 3000 5000 ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus PIN MAX3224E MAX3225E MAX3226E MAX3227E MAX3244E MAX3245E NAME FUNCTION 1 1 — READY 2 2 28 C1+ 3 3 27 V+ +5.5V generated by the charge pump 4 4 24 C1- Negative Terminal of Voltage-Doubler Charge-Pump Capacitor 5 5 1 C2+ Positive Terminal of Inverting Charge-Pump Capacitor 6 6 2 C2- Negative Terminal of Inverting Charge-Pump Capacitor 7 7 3 V- 8, 17 13 9–11 T_OUT 9, 16 8 4–8 R_IN 10, 15 9 15–19 R_OUT 11 10 21 INVALID 12, 13 11 12–14 T_IN 14 12 23 FORCEON 18 14 25 GND Ground 19 15 26 VCC +3.0V to +5.5V Single Supply Voltage 20 16 22 FORCEOFF — — 20 R2OUTB Ready to Transmit Output, active-high. READY is enabled high when V- goes below -4V and the device is ready to transmit. Positive Terminal of Voltage-Doubler Charge-Pump Capacitor -5.5V generated by the charge pump RS-232 Transmitter Outputs RS-232 Receiver Inputs TTL/CMOS Receiver Outputs Valid Signal Detector Output, active low. A logic high indicates that a valid RS-232 level is present on a receiver input. TTL/CMOS Transmitter Inputs Force-On Input, active high. Drive high to override AutoShutdown Plus, keeping transmitters and receivers on (FORCEOFF must be high) (Table 1). 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). TTL/CMOS Noninverting Complementary Receiver Outputs. Always active. _______________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 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. 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 M A X 3 2 2 5 E / M A X 3 2 2 7 E / MAX3245E) with worst-case loads of 3kΩ in parallel with 1000pF, providing compatibility with PC-to-PC comLapLink is a trademark of Traveling Software. _______________________________________________________________________________________ 7 MAX3224E–MAX3227E/MAX3244E/MAX3245E † ______________________________________________________________Pin Description MAX3224E–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 5k UART Tx GND CPU 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 I Figure 1. Interface Under Control of PMU PROTECTION DIODE munication 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 30sec, 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 pull-up resistors. Connect unused inputs to GND or VCC. 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 8 MAX3244E MAX3245E R2OUTB VCC Rx THREE-STATED UART 5k Tx GND b) R2IN R2OUT 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. _______________________________________________________________________________________ ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus RECEIVER OR TRANSMITTER EDGE WITHIN 30sec 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 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). 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 receiv- er input’s condition, it is independent of FORCEON and FORCEOFF states (Figures 3 and 4). AutoShutdown Plus Mode The MAX3224E–MAX3227E/MAX3244E/MAX3245E achieve a1µAsupply 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 30sec, 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 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 sys- _______________________________________________________________________________________ 9 MAX3224E–MAX3227E/MAX3244E/MAX3245E † Table 1. Output Control Truth Table +0.3V T_IN R_IN 30µs TIMER R -0.3V INVALID R_IN EDGE DETECT Figure 3a. INVALID Functional Diagram, INVALID Low FORCEOFF S 30sec TIMER EDGE DETECT INVALID ASSERTED IF ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR AT LEAST 30µs. AUTOSHDN R FORCEON Figure 3c. AutoShutdown Plus Logic +2.7V FORCEOFF POWERDOWN* FORCEON R_IN 30µs TIMER R -2.7V AUTOSHDN INVALID INVALID DEASSERTED IF ANY RECEIVER INPUT HAS BEEN BETWEEN +2.7V AND -2.7V FOR LESS THAN 30µs. * POWERDOWN IS ONLY AN INTERNAL SIGNAL. IT CONTROLS THE OPERATIONAL STATUS OF THE TRANSMITTERS AND THE POWER SUPPLIES. Figure 3b. INVALID Functional Diagram, INVALID High Figure 3d. Power-Down Logic Table 2. INVALID Truth Table (MAX3224E– MAX3227E) is driven low. The time required to exit shutdown is typically 100µs (Figure 8). RS-232 SIGNAL PRESENT AT ANY RECEIVER INPUT INVALID OUTPUT Yes High No Low tem 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. 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 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 30sec, and wake up when a valid receiver level or receiver or transmitter edge is detected. By connecting FORCEON and FORCEOFF to INVALID, the MAX3224E–MAX3227E/MAX3244E/MAX3245E shut down when no valid receiver level is detected and INVALID HIGH +2.7V RECEIVER INPUT LEVELS MAX3224E–MAX3227E/MAX3244E/MAX3245E † ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus INDETERMINATE +0.3V 0 INVALID LOW -0.3V INDETERMINATE -2.7V INVALID HIGH Figure 4a. Receiver Positive/Negative Thresholds for INVALID 10 ______________________________________________________________________________________ ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus INVALID } REGION TRANSMITTER INPUTS TRANSMITTER OUTPUTS INVALID OUTPUT VCC tINVL 0 tINVH tAUTOSHDN tAUTOSHDN tWU tWU *VCC OUTPUT 0 V+ VCC 0 V- *MAX3224E–MAX3227E Figure 4b. AutoShutdown Plus, INVALID, and READY Timing Diagram 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. 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 RS-232 products can latch and must be powered down to remove latchup. POWERMANAGEMENT UNIT MASTER SHDN LINE 0.1µF 1M 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. ±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 of the MAX3224E–MAX3227E/MAX3244E/MAX3245E have extra protection against static electricity. Maxim’s engineers FORCEOFF FORCEON MAX3224E MAX3225E MAX3226E MAX3227E MAX3244E MAX3245E Figure 5. AutoShutdown Plus Initial Turn-On to Wake Up a Mouse or Another System ______________________________________________________________________________________ 11 MAX3224E–MAX3227E/MAX3244E/MAX3245E † RECEIVER INPUTS RC 1M CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 100pF RC 50M to 100M 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. IEC1000-4-2 ESD Test Model I IP 100% 90% Ir 100% PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) 90% AMPERES I PEAK MAX3224E–MAX3227E/MAX3244E/MAX3245E † ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus 36.8% 10% 0 0 tRL TIME tDL CURRENT WAVEFORM 10% Figure 6b. Human Body Current Waveform t r = 0.7ns to 1ns 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 IEC1000-4-2 3) ±15kV using IEC1000-4-2’s air-gap method. 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 12 t 30ns 60ns Figure 7b. IEC1000-4-2 ESD Generator Current Waveform a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a 1.5kΩ resistor. IEC1000-4-2 The IEC1000-4-2 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 IEC1000-4-2, without the need for additional ESD-protection components. The major difference between tests done using the Human Body Model and IEC1000-4-2 is higher peak current in IEC1000-4-2, because series resistance is ______________________________________________________________________________________ ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus 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. 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 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). Table 3. Required Minimum Capacitance Values 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 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 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. ______________________________________________________________________________________ 13 MAX3224E–MAX3227E/MAX3244E/MAX3245E † lower in the IEC1000-4-2 model. Hence, the ESD withstand voltage measured to IEC1000-4-2 is generally lower than that measured using the Human Body Model. Figure 7a shows the IEC1000-4-2 model and Figure 7b shows the current waveform for the 8kV, IEC1000-4-2, Level 4, ESD contact-discharge test. MAX3224E–MAX3227E/MAX3244E/MAX3245E † ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus 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 T1IN 5V/div T1OUT 5V/div R1OUT VCC = 3.3V 2µs/div Figure 10. MAX3224E/MAX3226E/MAX3244E Loopback Test Result at 120kbps Mouse Driveability 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/ T1IN 5V/div T1OUT 5V/div VCC CBYPASS 5V/div R1OUT VCC = 3.3V VCC C1+ C1 C1C2+ C2 C2- Figure 11. MAX3224E/MAX3226E/MAX3244E Loopback Test Result at 250kbps VC4 T_ OUT T1IN 5V/div T1OUT 5V/div R_ IN R_ OUT 5k FORCEON FORCEOFF C3* MAX3224E MAX3225E MAX3226E MAX3227E MAX3244E MAX3245E T_ IN VCC 2µs/div V+ GND 1000pF 5V/div R1OUT VCC = 3.3V *C3 CAN BE RETURNED TO VCC OR GND. Figure 9. Loopback Test Circuit 14 200ns/div Figure 12. MAX3225E/MAX3227E/MAX3245E Loopback Test Result at 1Mbps ______________________________________________________________________________________ ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus MAX3224E–MAX3227E/MAX3244E/MAX3245E † +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 5k 18 R2OUT LOGIC OUTPUTS 5k 17 R3OUT RS-232 INPUTS 5k 16 R4OUT 5k 15 23 VCC TO POWERMANAGEMENT UNIT 22 21 R5OUT SERIAL MOUSE 5k FORCEON FORCEOFF INVALID GND 25 Figure 13a. Mouse Driver Test Circuit ______________________________________________________________________________________ 15 5 4 3 VOUT+ VCC = 3.0V MAX3245E dual charge pump ensures the transmitters will 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 TRANSMITTER OUTPUT VOLTAGE (V) MAX3224E–MAX3227E/MAX3244E/MAX3245E † ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus 2 Interconnection with 3V and 5V Logic VOUT+ 1 0 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. Table 5 lists other Maxim ESD-powered transceivers. -1 -2 VCC -3 -4 VOUTVOUT- -5 -6 0 1 2 3 4 5 6 7 8 9 10 LOAD CURRENT PER TRANSMITTER (mA) Figure 13b. MAX324_E Transmitter Output Voltage vs. Load Current per Transmitter 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) No. of Tx/Rx Human Body Model (kV) IEC 1000-4-2 Contact Discharge (kV) IEC 1000-4-2 Air-Gap Discharge (kV) Guaranteed Data Rate (kbps) MAX3241E +3.0 to +5.5 3/5 300 — MAX3243E +3.0 to +5.5 3/5 1 — — ±15 ±8 ±15 250 Yes ±15 ±8 ±15 MAX3244E +3.0 to +5.5 3/5 1 Yes 250 — ±15 ±8 ±15 MAX3245E +3.0 to +5.5 3/5 1 250 Yes — ±15 ±8 ±15 1Mbps MAX3232E +3.0 to +5.5 2/2 300 — — ±15 ±8 ±15 250 MAX3222E +3.0 to +5.5 MAX3223E +3.0 to +5.5 2/2 300 — — ±15 ±8 ±15 250 2/2 1 — Yes ±15 ±8 ±15 MAX3224E 250 +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 16 Supply AutoAutoCurrent Shutdown Shutdown (µA) Plus ______________________________________________________________________________________ ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus +3.3V +3.3V 15 0.1µF CBYPASS 2 C1+ C1 0.1µF 4 C15 C2 0.1µF 6 C2+ 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 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 AUTOSHUTDOWN INVALID 10 PLUS FORCEOFF 16 FORCEON 28 C1+ VCC T1OUT 13 5k 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 5k R2IN 10 R2OUT 5 25 9 5k 1 14 READY AUTOSHUTDOWN INVALID 11 PLUS FORCEOFF 20 FORCEON GND TO POWERMANAGEMENT UNIT VCC 18 ______________________________________________________________________________________ 17 MAX3224E–MAX3227E/MAX3244E/MAX3245E † ___________________________________________________Typical Operating Circuits MAX3224E–MAX3227E/MAX3244E/MAX3245E † ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus ___________________________________________________________Pin Configurations READY 1 16 FORCEOFF C2+ 1 C1+ 2 15 VCC C2- 2 27 V+ V+ 3 14 GND V- 3 26 VCC 13 T1OUT R1IN 4 25 GND 12 FORCEON R2IN 5 C1- 4 C2+ 5 MAX3226E MAX3227E C2- 6 V- 7 R1IN 8 10 INVALID R4IN 7 22 FORCEOFF 9 R1OUT R5IN 8 21 INVALID T1OUT 9 20 R2OUTB T2OUT 10 19 R1OUT T3OUT 11 18 R2OUT T3IN 12 17 R3OUT T2IN 13 16 R4OUT T1IN 14 15 R5OUT C1+ 2 19 VCC V+ 3 18 GND C2+ 5 23 FORCEON 17 T1OUT MAX3224E MAX3225E C2- 6 SO/SSOP 16 R1IN 15 R1OUT V- 7 T2OUT 24 C1- R3IN 6 20 FORCEOFF C1- 4 MAX3244E MAX3245E 11 T1IN SSOP READY 1 28 C1+ 14 FORCEON 8 13 T1IN R2IN 9 12 T2IN R2OUT 10 11 INVALID DIP/SSOP _Ordering Information (continued) ___________________Chip Information PART TEMP. RANGE PIN-PACKAGE MAX3224E MAX3226ECAE* 0°C to +70°C 16 SSOP TRANSISTOR COUNT: 1129 MAX3226EEAE* -40°C to +85°C 16 SSOP MAX3225E MAX3227ECAE* 0°C to +70°C 16 SSOP TRANSISTOR COUNT: 1129 MAX3227EEAE* MAX3244ECWI MAX3244ECAI -40°C to +85°C 0°C to +70°C 0°C to +70°C 16 SSOP 28 Wide SO 28 SSOP MAX3244EEWI MAX3244EEAI MAX3245ECWI MAX3245ECAI -40°C to +85°C -40°C to +85°C 0°C to +70°C 0°C to +70°C 28 Wide SO 28 SSOP 28 Wide SO 28 SSOP MAX3245EEWI MAX3245EEAI -40°C to +85°C -40°C to +85°C 28 Wide SO 28 SSOP MAX3226E TRANSISTOR COUNT: 1129 MAX3227E TRANSISTOR COUNT: 1129 MAX3244E/MAX3245E TRANSISTOR COUNT: 1335 *Future product. Contact factory for availability. 18 ______________________________________________________________________________________ ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus SSOP.EPS SOICW.EPS ______________________________________________________________________________________ 19 MAX3224E–MAX3227E/MAX3244E/MAX3245E † ________________________________________________________Package Information ___________________________________________Package Information (continued) PDIPN.EPS MAX3224E–MAX3227E/MAX3244E/MAX3245E † ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus 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. 20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.