19-0312; Rev 0; 9/94 +2.7V to +3.6V-Powered, 1µA Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver The MAX3212 uses Maxim’s new proprietary AutoShutdown mode to reduce supply current to 1µA. The MAX3212, with 3 RS-232 drivers and 5 RS-232 receivers, is intended for 2.7V to 3.6V-powered EIA/TIA-232E and V.28/V.24 serial interface. True RS-232 levels are maintained across the operating range. A guaranteed data rate of 235kbps provides compatibility with popular software for communicating with personal computers. Supply current is reduced to 1µA with Maxim’s new AutoShutdown feature. When the MAX3212 does not sense a valid signal level on the receiver inputs, the onboard power supply and drivers shut down. This occurs if the RS-232 cable is disconnected or if the transmitters of the connected peripheral are turned off. The system turns on again when a valid level is applied to any RS-232 receiver input. As a result, the system saves power without changes to the existing software. A second power-management feature is incorporated to permit automatic shutdown when the RS-232 connection is valid but inactive. In this case, a transition detector facilitates shutdown when the receivers are presented with stationary RS-232 levels for long periods. Three-state drivers are provided on receiver outputs so that multiple receivers, generally of different interface standards, can be wire-ORed at the UART. The MAX3212 is available in 28-pin SO and SSOP packages. ____________________________Features BETTER THAN BIPOLAR! ♦ ♦ ♦ ♦ ♦ ♦ ♦ 1µA Supply Current Using AutoShutdown Operates from Single +2.7V to +3.6V Supply 28-Pin SSOP or Wide SO Packages Meets All EIA/TIA-232E & EIA/TIA-562 Specifications Mouse Driveability–Guaranteed Low-Cost, Surface-Mount External Components 235kbps Guaranteed Data Rate– LapLink™ Compatible ♦ +5V Logic Compatible ♦ Complementary Receiver Output Always Active ♦ Flow-Through Pinout __________Typical Operating Circuit 0.68µF 1N6050 15µH +3.0V 0.33µF 3 27 1 VCC V+ LN 1N6050 2 16 LP V- 0.33µF 26 FORCEON +3.0V 25 FORCEOFF 5 TRAN 6 MAX3212 INVALID 13 T1IN 14 T2IN T2OUT 18 T2 15 T3IN T3OUT 17 T3 8 R1OUT ________________________Applications T1OUT 19 T1 R1IN 24 R1 5k Notebook and Palmtop Computers 9 R2OUT Peripherals R2IN 23 R2 5k Instruments 10 R3OUT Battery-Powered Equipment R3IN 22 R3 5k 11 R4OUT PART TEMP. RANGE 0°C to +70°C 28 Wide SO MAX3212CAI 0°C to +70°C 28 SSOP MAX3212EWI -40°C to +85°C MAX3212EAI -40°C to +85°C 5k 12 R5OUT PIN-PACKAGE MAX3212CWI R4IN 21 R4 ______________Ordering Information R5IN 20 R5 7 R5OUTB R5 5k 28 Wide SO 28 SSOP +3.0V EN 4 GND 28 AUTOSHUTDOWN OPERATION FORCEOFF = HIGH, FORCEON = LOW Pin Configuration appears at end of data sheet. * Patent pending RS-232 Present Yes No Status On Shut Down ________________________________________________________________ Maxim Integrated Products Call toll free 1-800-998-8800 for free samples or literature. 1 MAX3212* _______________General Description MAX3212 +2.7V to +3.6V-Powered, 1µA Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver ABSOLUTE MAXIMUM RATINGS Supply Voltages VCC .....................................................................-0.3V to +4.6V V+ ............................................................(VCC - 0.3V) to +7.4V V- ........................................................................-7.4V to +2.0V LN ..............................................................-0.3V to (V+ + 1.0V) LP.......................................................(V- - 1.0V) to (V+ + 0.3V) Input Voltages T_IN, EN, FORCEON, FORCEOFF .....................-0.3V to +7.0V R_IN ..................................................................................±25V Output Voltages T_OUT...............................................................................±15V R_OUT, R5OUTB, INVALID, TRAN............-0.3V to (V+ + 0.3V) Short-Circuit Duration, T_OUT....................................Continuous Continuous Power Dissipation (TA = +70°C) Wide SO (derate 11.76mW/°C above +70°C)...............941mW SSOP (derate 8.00mW/°C above +70°C) .....................640mW Operating Temperature Ranges MAX3212C_ I .......................................................0°C to +70°C MAX3212E_ I ....................................................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10sec) .............................+300°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VCC = 2.7V to 3.6V, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS Operating Voltage Range Meets or exceeds EIA/TIA-232E specifications 2.7 All R_IN unconnected, FORCEON = GND VCC Supply Current 1 FORCEOFF = GND FORCEON = FORCEOFF = VCC, no load 3.6 V 10 µA µA 1 10 1.5 3.0 mA LOGIC INPUT AND RECEIVER OUTPUTS 0.3VCC - 0.1 Input Logic Threshold Low T_IN, EN, FORCEON, FORCEOFF Input Logic Threshold High T_IN, EN, FORCEON, FORCEOFF Input Current High T_IN, EN, FORCEON, FORCEOFF 1 µA Input Current Low T_IN, EN, FORCEON, FORCEOFF 1 µA Hysteresis T_IN, VCC = 3.3V Logic Output Voltage Low IOUT = 1.0mA Logic Output Voltage High IOUT = -1.0mA Logic Output Leakage Current EN = GND, 0V < R_OUT < VCC 0.67VCC + 0.1 V V 0.3 V 0.4 V ±10 µA VCC - 0.5 V AUTOSHUTDOWN (FORCEON = GND, FORCEOFF = VCC) 2 Positive threshold Receiver Input Thresholds, Transmitters Enabled Figure 4 Receiver Input Thresholds, Transmitters Disabled 1µA supply current, Figure 4 INVALID Output Voltage Low IOUT = 1.0mA INVALID Output Voltage High IOUT = -1.0mA Receiver Threshold to Transmitters Enabled, tWU Figure 4b Receiver Positive or Negative Threshold to Invalid High, tINVH Receiver Positive or Negative Threshold to Invalid Low, tINVL Negative threshold 3.0 -3.0 -0.3 VCC - 0.6 V 0.3 V 0.4 V V 250 µs Figure 4 1 µs Figure 4 30 µs _______________________________________________________________________________________ +2.7V to +3.6V-Powered, 1µA Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver MAX3212 ELECTRICAL CHARACTERISTICS (continued) (VCC = 2.7V to 3.6V, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS +25 V EIA/TIA-232E RECEIVERS Input Voltage Operating Range -25 Input Voltage Threshold Low 0.4 V Input Voltage Threshold High 3.0 Input Hysteresis 0.7 Input Resistance -15V < VIN < 15V 3 5 ±5.5 V V 7 kΩ EIA/TIA-232E EIA/TIA-232ETRANSMITTERS TRANSMITTERS Output Voltage Swing (VHIGH, VLOW) All transmitters loaded with 3kΩ to GND ±5.0 Output Resistance VCC = V- = V+ = 0V, -2V < T_OUT < 2V 300 EIA/TIA-232E Short-Circuit Current V Ω 28 60 mA MOUSE DRIVEABILITY Transmitter Output Voltage TIN = T2IN = GND, T3IN = VCC, T3OUT loaded with 3kΩ to GND, T1OUT and T2OUT loaded with 5mA ±5 V TIMING CHARACTERISTICS (VCC = 2.7V to 3.6V, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS RL = 3kΩ, CL = 1000pF, one transmitter switching, 150pF load on each receiver Data Rate MIN TYP 235 250 MAX UNITS kbps Receiver Output Enable Time tER 70 200 ns Receiver Output Disable Time tDR 420 700 ns Transmitter Output Enable Time tET Transmitter Output Disable Time tDT Receiver Propagation Delay tPHLR tPLHR Includes power-supply start-up 150pF load 250 µs 600 ns 630 2000 630 2000 tPHL - tPLH 40 2500pF 3kΩ load 800 2000 800 2000 Transmitter Skew tPHL - tPLH 52 Transition-Region Slew Rate RL = 3kΩ to 7kΩ, measured from +3V to -3V or -3V to +3V Receiver Skew Transmitter Propagation Delay tPHLT tPLHT ns ns ns ns CL = 50pF to 2500pF 4.0 10 30 CL = 50pF to 1000pF 6 13 30 V/µs EN High to TRAN Reset Delay 5 µs EN High Pulse Width 1 µs _______________________________________________________________________________________ 3 __________________________________________Typical Operating Characteristics (VCC = 3.3V, TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. SUPPLY VOLTAGE TRANSMITTING SUPPLY CURRENT vs. LOAD CAPACITANCE 60 50 35 30 25 TRANSMITTERS LOADED WITH 3kΩ + 2500pF 1 TRANSMITTER (FULL DATA RATE) 2 TRANSMITTERS (DATA RATE/8) 20 15 0 50 100 150 200 50 SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) 55 235kbps 45 40 35 120kbps 30 30 20 3kΩ + 120kbps 10 3kΩ + 20kbps 3kΩ ONLY 0 20 20kbps -10 15 250 1000 0 2000 3000 4000 2.0 5000 3.0 7.5 TRANSMITTER OUTPUT VOLTAGE (V) MAX3212-04 12 +SLEW -SLEW 8 6 4 TRANSMITTERS LOADED WITH 3kΩ AND SPECIFIED CAPACITANCE AT 232kbps 0 VOUT+ 5.0 TRANSMITTERS LOADED WITH 3kΩ AND SPECIFIED CAPACITANCE 2.5 0 -2.5 VOUT- -5.0 -7.5 0 1000 2000 3000 4000 1000 0 5000 2000 3000 4000 5000 LOAD CAPACITANCE/TRANSMITTER (pF) LOAD CAPACITANCE/TRANSMITTER (pF) TIME TO EXIT SHUTDOWN: ONE TRANSMITTER HIGH, ONE TRANSMITTER LOW FORCEON, FORCEOFF VOH 0V T_OUT 2V/div 0V VOL RL = 3kΩ || 2500pF 100µs/div 4 3.5 TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE AT 235kbps 14 10 2.5 SUPPLY VOLTAGE (V) LOAD CAPACITANCE/TRANSMITTER (pF) SLEW RATE vs. LOAD CAPACITANCE SLEW RATE (V/µs) 40 25 DATA RATE (kbps) 2 3kΩ + 235kbps MAX3212-05 40 60 MAX3212-02 65 MAX3212-01 45 MAX3212-03 TRANSMITTING SUPPLY CURRENT vs. DATA RATE SUPPLY CURRENT (mA) MAX3212 +2.7V to +3.6V-Powered, 1µA Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver _______________________________________________________________________________________ 4.0 +2.7V to +3.6V-Powered, 1µA Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver PIN NAME 1 LN Inductor/Diode Connection Point FUNCTION 2 LP Inductor/Diode Connection Point 3 VCC Supply Voltage Input, 2.7V to 3.6V 4 EN Receiver Enable Control. Drive EN low to force receiver outputs into a high-Z state. Drive EN high for normal operation. Cycle EN high then low to reset TRAN. TRAN is always low when EN is high. 5 TRAN Transition Detection Output. TRAN latches high when a transition occurs on any receiver input while EN is low. Reset by cycling the EN pin high then low. 6 INVALID Output of Invalid Signal Detector. Low if invalid RS-232 levels are present on all receiver inputs, otherwise high. Complementary Output of R5OUT—always active 7 R5OUTB 8–12 R1OUT–R5OUT Receiver Outputs. Swing from GND to VCC. High-impedance when EN is low. 13, 14, 15 T1IN, T2IN, T3IN Transmitter Inputs 16 V- 17, 18, 19 T3OUT, T2OUT, T1OUT 20–24 R5IN–R1IN Receiver Inputs 25 FORCEOFF Drive low to shut down transmitters and on-board power supply, overriding all automatic circuitry and FORCEON (see Figure 3). 26 FORCEON 27 V+ 28 GND Negative Supply generated on-board Transmitter Outputs Drive high to overide automatic circuitry, keeping transmitters on (see Figure 3). FORCEOFF = high. Positive Supply generated on-board Ground _______________Detailed Description The MAX3212 line driver/receiver is intended for 3Vpowered EIA/TIA-232E and V.28/V.24 communications interfaces where 3 drivers and 5 receivers are required. The operating voltage range extends from 3.6V down to 2.7V while still maintaining true RS-232 and EIA/TIA-562 transmitter output voltage levels. The circuit comprises three sections: power supply, transmitters, and receivers. The power-supply section converts the supplied 3V to about ±6.5V, to provide the voltages necessary for the drivers to meet true RS232 levels. External components are small and inexpensive. The transmitters and receivers are guaranteed to operate at data rates of 235kbps. The MAX3212 is equipped with Maxim’s new proprietary AutoShutdown circuitry. This achieves a supply current of 1µA by shutting down the device when the RS-232 cable is disconnected or when the connected peripheral transmitters are turned off. While shut down, all receivers can remain active or can be disabled under logic control. A complementary receiver remains active in all cases, enabling a system incorporating the MAX3212 to remain shut down and still monitor incoming RS-232 activity. Three-state drivers on all receiver outputs are provided so that multiple receivers, generally of different interface standards, can be wire-ORed at the UART. Switch-Mode Power Supply The switch-mode power supply uses a single inductor with two inexpensive diodes and two capacitors to generate ±6.5V from the 2.7V to 3.6V input. The Typical Operating Circuit shows the complete circuit for the power supply. Use a 15µH inductor with a saturation current rating of at least 350mA and under 1Ω resistance. Use 1N6050 diodes or equivalent. Surface-mount equivalents for the 1N6050 include the Motorola MMBD6050LT1, Philips PMBD6050, and Allegro (formerly Sprague) TMPD6050LT. For C1 and C2, use ceramic capacitors with values no less than indicated in the Typical Operating Circuit. These capacitors determine the ripple on V+ and V-, but _______________________________________________________________________________________ 5 MAX3212 ______________________________________________________________Pin Description MAX3212 +2.7V to +3.6V-Powered, 1µA Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver not the absolute voltages. Increasing the size of C1 and C2 increases the time V+ and V- take to reach their final value. Bypass VCC to GND with at least 0.33µF close to the MAX3212. Increase this to 4.7µF if there are no other V CC supply bypass components less than 6 inches (15cm) away from the MAX3212. Component suppliers are listed in Table 1. RS-232 Drivers All three drivers are identical and deliver EIA/TIA-232E and EIA/TIA-562 output voltage levels when VCC is between 2.7V and 3.6V. When FORCEOFF is driven low or when the AutoShutdown circuitry senses invalid voltage levels at all receiver inputs, the drivers are disabled and the outputs are forced into a high-impedance state. RS-232 Receivers The MAX3212 receivers convert RS-232 signals to CMOS-logic output levels. All receivers have one inverting three-state output. Receiver 5 also has a complementary (noninverting) output. In shutdown, all five inverting receivers can be either active or inactive under logic control. The complementary output (R5OUTB) is always active, regardless of the state of EN or the part’s shutdown status. R5OUTB can monitor RS-232 activity while the other receivers are high impedance. This allows Ring Indicator to be monitored without forward biasing other devices connected to the receiver outputs. This is ideal for systems where the UART’s VCC is set to 0V in shutdown. (See Figure 2.) Enable Control The EN input has two functions: It allows enabling/disabling of the receivers, and it is used to reset the transition detector. Driving EN low places five inverting receiver outputs (R_OUT) into a high-impedance state. R5OUTB is always active, regardless of the state of EN or the part’s shutdown status (Table 2). EN has no effect on T_OUT. EN also resets the transition detector. Drive EN high and then low to reset the TRAN output low. TRAN goes high when a transition occurs on any receiver input. Table 1. Suggested Component Suppliers MANUFACTURER PART NUMBER PHONE FAX Diodes Allegro TMPD6050LT USA (508) 853-5000 USA (508) 853-5049 Motorola MMBD6050LT1 USA (408) 749-0510 USA (408) 991-7420 Philips PMBD6050 USA (401) 762-3800 USA (401) 767-4493 Murata-Erie LQH4N150K-TA USA (404) 436-1300 Japan (075) 951-9111 USA (404) 684-1541 Japan (075) 955-6526 Sumida CD43150 USA (708) 956-0666 Japan (03) 3607-5111 USA (708) 956-0702 Japan (03) 3607-5428 TDK NLC453232T-150K USA (708) 803-6100 Japan (03) 3278-5111 USA (708) 803-6296 Japan (03) 3278-5358 Inductors Table 2. AutoShutdown Logic 6 RS-232 SIGNAL PRESENT AT RECEIVER INPUT FORCEOFF INPUT Yes No FORCEON INPUT INVALID OUTPUT H X H Normal Operation H H L Normal Operation (Forced On) TRANSCEIVER STATUS No H L L Shutdown (AutoShutdown) Yes L X H Shutdown (Forced Off) No L X L Shutdown (Forced Off) _______________________________________________________________________________________ +2.7V to +3.6V-Powered, 1µA Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver MAX3212 VCC POWER MANAGEMENT UNIT OR KEYBOARD CONTROLLER FORCEOFF FORCEON INVALID PREVIOUS RS-232 MAX3212 VCC CPU I/O CHIP WITH UART ESD PROTECTION DIODE Rx 5k UART RS-232 Tx SHDN = LOW GND a) OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM ACTIVE RECEIVER OUTPUT IN SHUTDOWN. VCC Figure 1. Interface Under Control of PMU TO µP LOGIC TRANSITION DETECTOR AutoShutdown A 1µA supply current is achieved with Maxim’s new AutoShutdown feature, which operates when FORCEON is low and FORCEOFF is high. When the MAX3212 senses no valid signal level on any receiver input for typically 30µs, the on-board power supply and drivers shut down. Internal 5kΩ resistors pull the receiver inputs to ground, disabling the transmitters and reducing supply current to 1µA when the device is in AutoShutdown mode. This occurs if the RS-232 cable is disconnected or if the connected peripheral transmitters are turned off. The system turns on again when a valid level is applied to any RS-232 receiver input. As a result, the system saves power without changes to the existing BIOS or operating system. When using the AutoShutdown feature, INVALID is high when the device is on and low when the device is shut down. The INVALID output indicates the condition of the receiver inputs; INVALID can be used in any mode. MAX3212 R5OUTB VCC ESD PROTECTION DIODE Rx EN = LOW UART Tx GND R5IN R5OUT T1IN 5k T1OUT SHDN = LOW b) NEW MAX3212: EN SHUTS DOWN RECEIVER OUTPUTS (EXCEPT FOR R5OUTB) SO NO CURRENT FLOWS TO UART IN SHUTDOWN. R5OUTB INDICATES RECEIVER ACTIVITY DURING SHUTDOWN WITH EN HIGH. Figure 2. Detection of RS-232 Activity when the UART and Interface Are Shut Down: MAX3212 (b) vs. Previous Transceivers (a) _______________________________________________________________________________________ 7 MAX3212 +2.7V to +3.6V-Powered, 1µA Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver +0.3V to +3.0V + FORCEOFF POWER DOWN + -0.3V to -3.0V FORCEON RIN_ Rx ROUT_ EN • • • • • 30µs DELAY INVALID • INVALID IS AN INTERNALLY GENERATED SIGNAL THAT IS USED BY THE AUTOSHUTDOWN LOGIC AND APPEARS AS AN OUTPUT OF THE DEVICE. POWER DOWN IS ONLY AN INTERNAL SIGNAL. IT CONTROLS THE OPERATIONAL STATUS OF THE TRANSMITTERS AND THE POWER SUPPLIES. FORCEOFF 0 0 0 0 1 1 1 1 FORCEON 0 0 1 1 0 0 1 1 INVALID 0 1 0 1 0 1 0 1 POWER DOWN 0 0 0 0 0 1 1 1 Figure 3. AutoShutdown Logic Table 2 summarizes the MAX3212 operating modes. FORCEON and FORCEOFF override the automatic circuitry and force the transceiver into its normal operating state or into its low-power standby state. When neither control is asserted, the IC selects between these states automatically based on receiver input levels. Figure 4 depicts valid and invalid RS-232 receiver levels. The MAX3212 shuts down after sensing invalid RS-232 levels for greater than 30µs, ensuring the AutoShutdown mode is not enabled for slow-moving signals (1V/µs). A mouse or another system with AutoShutdown may need a period of time to wake up. Figure 5 shows a circuit that forces the transmitters on for 100ms after startup, allowing enough time for the other system to realize that the MAX3212 system is awake. If the other system outputs valid RS-232 signals within that time, the RS232 ports on both systems remain enabled. 8 Transition Detector The MAX3212 also has an on-board transition detector that monitors activity on the receiver inputs. In systems with a sleep mode, the transition detector output (TRAN) can be used to wake up the system when activity at the receiver inputs is detected. Before putting the system to sleep, set TRAN low by cycling EN high and then low. TRAN remains low as long as no activity is detected on the receiver inputs. When any receiver is toggled, TRAN latches high. Connect TRAN to a microprocessor interrupt, or if the system wakes up periodically TRAN can be polled. Transition detection is useful when valid RS232 levels are present at the receiver inputs but no data is being sent. For example, if a printer is attached to the serial port but is not in use, the microprocessor senses this and forces the MAX3212 off. _______________________________________________________________________________________ +2.7V to +3.6V-Powered, 1µA Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver +0.3V 0V MASTER SHDN LINE 0.1µF INDETERMINATE MAX3212 POWER MANAGEMENT UNIT TRANSMITTERS ENABLED, INVALID HIGH +3.0V 1M AUTOSHUTDOWN, TRANSMITTERS DISABLED, 1µA SUPPLY CURRENT, INVALID LOW -0.3V FORCEOFF FORCEON INDETERMINATE MAX3212 -3.0V TRANSMITTERS ENABLED, INVALID HIGH (a) Figure 5. AutoShutdown with Initial Turn-On to Wake Up a Mouse or Another System RECEIVER INPUT VOLTAGE (V) INVALID REGION VCC INVALID OUTPUT (V) 0 tINVL tINVH tWU V+ VCC V- (b) Figure 4. AutoShutdown Trip Levels _______________________________________________________________________________________ 9 +2.7V to +3.6V-Powered, 1µA Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver MAX3212 Driving the MAX3212 from 5V Logic The MAX3212 can directly interface with various 5V logic families, including ACT and HCT CMOS. TRANSMITTER OUTPUT VOLTAGE vs. LOAD CURRENT PER TRANSMITTER Mouse Driveability MAX3212-06 TRANSMITTER OUTPUT VOLTAGE (V) 7 T1OUT AND T2OUT 5 The MAX3212 has been specifically designed to power serial mice while operating from low-voltage power supplies. It has been tested with samples of ten major mouse models from six manufacturers, including the leading three, Logitech (5 models), Mouse Systems, and Microsoft. The MAX3212 successfully drove all serial mice and met their respective current and voltage requirements. 3 1 VCC = 2.7V VCC = 3.3V T1IN AND T2IN = GND T3IN = VCC T3OUT, T2OUT, T1OUT ALL LOADED SIMULTANEOUSLY -1 -3 -5 Figure 6 shows the transmitter output voltages under increasing load current. The MAX3212’s switching regulator ensures the transmitters will supply at least ±5V during worst-case load conditions. T3OUT -7 0 1 2 3 4 5 6 7 8 9 LOAD CURRENT PER TRANSMITTER (mA) Figure 6. Mouse Emulation Circuit Current _____+3V-Powered EIA/TIA-232 and EIA/TIA-562 Transceivers from Maxim PART POWERSUPPLY VOLTAGE (V) No. OF TRANSMITTERS/ RECEIVERS No. OF RECEIVERS ACTIVE IN SHUTDOWN GUARANTEED DATA RATE (kbps) EIA/TIA232 OR 562 MAX212 3.0 to 3.6 3/5 5 120 232 Drives mice MAX218 1.8 to 4.25 2/2 2 120 232 Operates directly from batteries without a voltage regulator MAX562 MAX563 2.7 to 5.25 3.0 to 3.6 3/5 2/2 5 2 230 230 562 562 MAX3212 2.7 to 3.6 3/5 5 235 232 MAX3222 3.0 to 5.5 2/2 2 120 232 0.1µF capacitors MAX3223 MAX3232 3.0 to 5.5 3.0 to 5.5 2/2 2/2 2 N/A 120 120 232 232 0.1µF capacitors, AutoShutdown 0.1µF capacitors MAX3241 3.0 to 5.5 3/5 5 120 232 0.1µF capacitors, 2 complementary receivers, drives mice MAX3243 3.0 to 5.5 3/5 1 120 232 0.1µF capacitors, AutoShutdown, complementary receiver, drives mice 10 FEATURES Wide supply range 0.1µF capacitors AutoShutdown, complementary receiver, drives mice, transient detection ______________________________________________________________________________________ +2.7V to +3.6V-Powered, 1µA Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver MAX3212 __________________Pin Configuration TOP VIEW LN 1 28 GND LP 2 27 V+ VCC 3 26 FORCEON EN 4 25 FORCEOFF TRAN 5 INVALID 6 MAX3212 24 R1IN 23 R2IN R5OUTB 7 22 R3IN R1OUT 8 21 R4IN R2OUT 9 20 R5IN R3OUT 10 19 T1OUT R4OUT 11 18 T2OUT R5OUT 12 17 T3OUT T1IN 13 16 V- T2IN 14 15 T3IN SO/SSOP TRANSISTOR COUNT: 1435 ______________________________________________________________________________________ 11 MAX3212 +2.7V to +3.6V-Powered, 1µA Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver ________________________________________________________Package Information DIM A A1 B C D E e H L α α E H C L INCHES MILLIMETERS MIN MAX MIN MAX 0.068 0.078 1.73 1.99 0.002 0.008 0.05 0.21 0.010 0.015 0.25 0.38 0.004 0.008 0.09 0.20 SEE VARIATIONS 0.205 0.209 5.20 5.38 0.0256 BSC 0.65 BSC 0.301 0.311 7.65 7.90 0.025 0.037 0.63 0.95 0˚ 8˚ 0˚ 8˚ DIM PINS e SSOP SHRINK SMALL OUTLINE PACKAGE A B A1 D D D D D 14 16 20 24 28 INCHES MILLIMETERS MAX MIN MAX MIN 6.33 0.239 0.249 6.07 6.33 0.239 0.249 6.07 7.33 0.278 0.289 7.07 8.33 0.317 0.328 8.07 0.397 0.407 10.07 10.33 21-0056A D DIM D 0°- 8° A e B 0.101mm 0.005in. A1 C L A A1 B C E e H L INCHES MAX MIN 0.104 0.093 0.012 0.004 0.019 0.014 0.013 0.009 0.299 0.291 0.050 0.419 0.394 0.050 0.016 DIM PINS E W PACKAGE SMALL OUTLINE H D D D D D 16 18 20 24 28 INCHES MIN MAX 0.398 0.413 0.447 0.463 0.496 0.512 0.598 0.614 0.697 0.713 MILLIMETERS MIN MAX 2.35 2.65 0.10 0.30 0.35 0.49 0.23 0.32 7.40 7.60 1.27 10.00 10.65 0.40 1.27 MILLIMETERS MIN MAX 10.10 10.50 11.35 11.75 12.60 13.00 15.20 15.60 17.70 18.10 21-0042A 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. 12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1994 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.