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19-0312; Rev 0; 9/94
+2.7V to +3.6V-Powered, 1A Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver
_______________General Description
The MAX3212 uses Maxim's new proprietary AutoShutdown mode to reduce supply current to 1A. 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 1A 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!
o o o o o o o 1A 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- LapLinkTM Compatible o +5V Logic Compatible o Complementary Receiver Output Always Active o Flow-Through Pinout
MAX3212*
__________Typical Operating Circuit
0.68F 1N6050 15H +3.0V 0.33F 3 27 1 VCC V+ LN 26 FORCEON +3.0V 25 FORCEOFF 5 TRAN 6 INVALID T1 T2 T3 R1 5k 9 R2OUT R2 5k 10 R3OUT R3 5k 11 R4OUT R3IN 22 R2IN 23 T1OUT 19 T2OUT 18 T3OUT 17 R1IN 24 13 T1IN 14 T2IN 15 T3IN 1N6050 2 16 LP V0.33F
MAX3212
________________________Applications
Notebook and Palmtop Computers Peripherals Instruments Battery-Powered Equipment
8 R1OUT
______________Ordering Information
PART MAX3212CWI MAX3212CAI MAX3212EWI MAX3212EAI TEMP. RANGE 0C to +70C 0C to +70C -40C to +85C -40C to +85C PIN-PACKAGE 28 Wide SO 28 SSOP 28 Wide SO 28 SSOP
+3.0V EN 4 12 R5OUT 7 R5OUTB
R4 5k R5 R5 5k GND 28
R4IN 21
R5IN 20
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
1
Call toll free 1-800-998-8800 for free samples or literature.
+2.7V to +3.6V-Powered, 1A Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver MAX3212
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 = +70C) Wide SO (derate 11.76mW/C above +70C)...............941mW SSOP (derate 8.00mW/C above +70C) .....................640mW Operating Temperature Ranges MAX3212C_ I .......................................................0C to +70C MAX3212E_ I ....................................................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+300C
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 DC CHARACTERISTICS Operating Voltage Range VCC Supply Current Meets or exceeds EIA/TIA-232E specifications All R_IN unconnected, FORCEON = GND FORCEOFF = GND FORCEON = FORCEOFF = VCC, no load LOGIC INPUT AND RECEIVER OUTPUTS Input Logic Threshold Low Input Logic Threshold High Input Current High Input Current Low Hysteresis Logic Output Voltage Low Logic Output Voltage High Logic Output Leakage Current Receiver Input Thresholds, Transmitters Enabled Receiver Input Thresholds, Transmitters Disabled INVALID Output Voltage Low INVALID Output Voltage High Receiver Threshold to Transmitters Enabled, tWU Receiver Positive or Negative Threshold to Invalid High, tINVH Receiver Positive or Negative Threshold to Invalid Low, tINVL 2 T_IN, EN, FORCEON, FORCEOFF T_IN, EN, FORCEON, FORCEOFF T_IN, EN, FORCEON, FORCEOFF T_IN, EN, FORCEON, FORCEOFF T_IN, VCC = 3.3V IOUT = 1.0mA IOUT = -1.0mA EN = GND, 0V < R_OUT < VCC Positive threshold Negative threshold -3.0 -0.3 0.3 0.4 VCC - 0.6 250 1 30 VCC - 0.5 10 3.0 0.3 0.4 0.67VCC + 0.1 1 1 0.3VCC - 0.1 V V A A V V V A 2.7 1 1 1.5 3.6 10 10 3.0 V A A mA CONDITIONS MIN TYP MAX UNITS
AUTOSHUTDOWN (FORCEON = GND, FORCEOFF = VCC) Figure 4 V V V V s s s
1A supply current, Figure 4 IOUT = 1.0mA IOUT = -1.0mA Figure 4b Figure 4 Figure 4
_______________________________________________________________________________________
+2.7V to +3.6V-Powered, 1A Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 2.7V to 3.6V, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER EIA/TIA-232E RECEIVERS Input Voltage Operating Range Input Voltage Threshold Low Input Voltage Threshold High Input Hysteresis Input Resistance EIA/TIA-232E TRANSMITTERS EIA/TIA-232E TRANSMITTERS Output Voltage Swing (VHIGH, VLOW) Output Resistance EIA/TIA-232E Short-Circuit Current MOUSE DRIVEABILITY Transmitter Output Voltage TIN = T2IN = GND, T3IN = VCC, T3OUT loaded with 3k to GND, T1OUT and T2OUT loaded with 5mA 5 V All transmitters loaded with 3k to GND VCC = V- = V+ = 0V, -2V < T_OUT < 2V 5.0 300 28 60 5.5 V mA -15V < VIN < 15V 3 0.7 5 7 -25 0.4 3.0 +25 V V V V k CONDITIONS MIN TYP MAX UNITS
MAX3212
TIMING CHARACTERISTICS
(VCC = 2.7V to 3.6V, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER Data Rate Receiver Output Enable Time Receiver Output Disable Time Transmitter Output Enable Time Transmitter Output Disable Time Receiver Propagation Delay Receiver Skew Transmitter Propagation Delay Transmitter Skew Transition-Region Slew Rate EN High to TRAN Reset Delay EN High Pulse Width tPHLT tPLHT tER tDR tET tDT tPHLR tPLHR 150pF load Includes power-supply start-up SYMBOL CONDITIONS RL = 3k, CL = 1000pF, one transmitter switching, 150pF load on each receiver MIN 235 TYP 250 70 420 250 600 630 630 40 800 800 52 CL = 50pF to 2500pF CL = 50pF to 1000pF 4.0 6 10 13 5 1 30 V/s 30 s s 2000 2000 2000 2000 200 700 MAX UNITS kbps ns ns s ns ns ns ns ns
tPHL - tPLH
2500pF 3k load
tPHL - tPLH
RL = 3k to 7k, measured from +3V to -3V or -3V to +3V
_______________________________________________________________________________________
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+2.7V to +3.6V-Powered, 1A Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver MAX3212
__________________________________________Typical Operating Characteristics
(VCC = 3.3V, TA = +25C, unless otherwise noted.)
TRANSMITTING SUPPLY CURRENT vs. DATA RATE
MAX3212-01
TRANSMITTING SUPPLY CURRENT vs. LOAD CAPACITANCE
60 55 SUPPLY CURRENT (mA) 50 45 40 35 30 25 20 15 0 1000 2000 3000 4000 5000 LOAD CAPACITANCE/TRANSMITTER (pF) 0 20kbps -10 2.0 120kbps 235kbps
MAX3212-02
SUPPLY CURRENT vs. SUPPLY VOLTAGE
50 SUPPLY CURRENT (mA) 40 30 20 10 3k + 120kbps 3k + 20kbps 3k ONLY 3k + 235kbps
MAX3212-03
45 40 SUPPLY CURRENT (mA) 35 30 25 20 15 0 TRANSMITTERS LOADED WITH 3k + 2500pF 1 TRANSMITTER (FULL DATA RATE) 2 TRANSMITTERS (DATA RATE/8) 50 100 150 200
65
60
250
2.5
3.0
3.5
4.0
DATA RATE (kbps)
SUPPLY VOLTAGE (V)
SLEW RATE vs. LOAD CAPACITANCE
MAX3212-04
TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE AT 235kbps
TRANSMITTER OUTPUT VOLTAGE (V) VOUT+ 5.0 2.5 0 -2.5 -5.0 -7.5 VOUTTRANSMITTERS LOADED WITH 3k AND SPECIFIED CAPACITANCE
MAX3212-05
14 12 +SLEW SLEW RATE (V/s) 10 8 6 4 2 0 0 1000 2000 3000 4000 TRANSMITTERS LOADED WITH 3k AND SPECIFIED CAPACITANCE AT 232kbps -SLEW
7.5
5000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE/TRANSMITTER (pF)
LOAD CAPACITANCE/TRANSMITTER (pF)
TIME TO EXIT SHUTDOWN: ONE TRANSMITTER HIGH, ONE TRANSMITTER LOW
FORCEON, FORCEOFF 0V 2V/div VOH
0V
T_OUT
VOL RL = 3k || 2500pF 100s/div
4
_______________________________________________________________________________________
+2.7V to +3.6V-Powered, 1A Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver
______________________________________________________________Pin Description
PIN 1 2 3 4 NAME LN LP VCC EN Inductor/Diode Connection Point Inductor/Diode Connection Point Supply Voltage Input, 2.7V to 3.6V 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. 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. 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 Receiver Outputs. Swing from GND to VCC. High-impedance when EN is low. Transmitter Inputs Negative Supply generated on-board Transmitter Outputs Receiver Inputs Drive low to shut down transmitters and on-board power supply, overriding all automatic circuitry and FORCEON (see Figure 3). Drive high to overide automatic circuitry, keeping transmitters on (see Figure 3). FORCEOFF = high. Positive Supply generated on-board Ground FUNCTION
MAX3212
5 6 7 8-12 13, 14, 15 16 17, 18, 19 20-24 25 26 27 28
TRAN INVALID R5OUTB R1OUT-R5OUT T1IN, T2IN, T3IN VT3OUT, T2OUT, T1OUT R5IN-R1IN FORCEOFF FORCEON V+ GND
_______________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 1A 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 15H inductor with a saturation current rating of at least 350mA and under 1 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
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_______________________________________________________________________________________
+2.7V to +3.6V-Powered, 1A Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver MAX3212
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 0.33F close to the MAX3212. Increase this to 4.7F 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. 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.)
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.
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.
PHONE FAX
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
Table 1. Suggested Component Suppliers
MANUFACTURER Diodes Allegro Motorola Philips Inductors Murata-Erie Sumida TDK LQH4N150K-TA CD43150 NLC453232T-150K USA (404) 436-1300 Japan (075) 951-9111 USA (708) 956-0666 Japan (03) 3607-5111 USA (708) 803-6100 Japan (03) 3278-5111 USA (404) 684-1541 Japan (075) 955-6526 USA (708) 956-0702 Japan (03) 3607-5428 USA (708) 803-6296 Japan (03) 3278-5358 TMPD6050LT MMBD6050LT1 PMBD6050 USA (508) 853-5000 USA (408) 749-0510 USA (401) 762-3800 USA (508) 853-5049 USA (408) 991-7420 USA (401) 767-4493 PART NUMBER
Table 2. AutoShutdown Logic
RS-232 SIGNAL PRESENT AT RECEIVER INPUT Yes No No Yes No 6 FORCEOFF INPUT H H H L L FORCEON INPUT X H L X X INVALID OUTPUT H L L H L TRANSCEIVER STATUS Normal Operation Normal Operation (Forced On) Shutdown (AutoShutdown) Shutdown (Forced Off) Shutdown (Forced Off)
_______________________________________________________________________________________
+2.7V to +3.6V-Powered, 1A Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver MAX3212
VCC POWER MANAGEMENT UNIT OR KEYBOARD CONTROLLER FORCEOFF FORCEON INVALID
MAX3212
VCC ESD PROTECTION DIODE Rx UART RS-232 Tx GND SHDN = LOW
PREVIOUS RS-232
CPU
I/O CHIP WITH UART
5k
a) OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM ACTIVE RECEIVER OUTPUT IN SHUTDOWN. VCC
Figure 1. Interface Under Control of PMU
TO P
LOGIC TRANSITION DETECTOR
AutoShutdown
A 1A 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 30s, the on-board power supply and drivers shut down. Internal 5k resistors pull the receiver inputs to ground, disabling the transmitters and reducing supply current to 1A 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
R5OUT EN = LOW T1IN SHDN = LOW 5k
R5IN
UART
T1OUT
Tx GND
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
+2.7V to +3.6V-Powered, 1A Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver MAX3212
+0.3V to +3.0V + FORCEOFF + -0.3V to -3.0V FORCEON RIN_ EN Rx ROUT_ POWER DOWN
* * *
* * *
30s 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 30s, ensuring the AutoShutdown mode is not enabled for slow-moving signals (1V/s). 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.
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.
8
_______________________________________________________________________________________
+2.7V to +3.6V-Powered, 1A Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver MAX3212
TRANSMITTERS ENABLED, INVALID HIGH +3.0V INDETERMINATE +0.3V 0V -0.3V INDETERMINATE -3.0V TRANSMITTERS ENABLED, INVALID HIGH AUTOSHUTDOWN, TRANSMITTERS DISABLED, 1A SUPPLY CURRENT, INVALID LOW
POWER MANAGEMENT UNIT
MASTER SHDN LINE 0.1F 1M
FORCEOFF FORCEON
MAX3212
(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
_______________________________________________________________________________________
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+2.7V to +3.6V-Powered, 1A Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver MAX3212
Driving the MAX3212 from 5V Logic
TRANSMITTER OUTPUT VOLTAGE vs. LOAD CURRENT PER TRANSMITTER
TRANSMITTER OUTPUT VOLTAGE (V) T1OUT AND T2OUT 5 3 1 -1 -3 -5 -7 0 1 2 3 4 5 6 7 8 9 LOAD CURRENT PER TRANSMITTER (mA) VCC = 2.7V T1IN AND T2IN = GND T3IN = VCC T3OUT, T2OUT, T1OUT ALL LOADED SIMULTANEOUSLY VCC = 3.3V
MAX3212-06
The MAX3212 can directly interface with various 5V logic families, including ACT and HCT CMOS.
7
Mouse Driveability
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. 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
Figure 6. Mouse Emulation Circuit Current
_____+3V-Powered EIA/TIA-232 and EIA/TIA-562 Transceivers from Maxim
POWERSUPPLY VOLTAGE (V) 3.0 to 3.6 1.8 to 4.25 2.7 to 5.25 3.0 to 3.6 2.7 to 3.6 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 No. OF TRANSMITTERS/ RECEIVERS 3/5 2/2 3/5 2/2 3/5 2/2 2/2 2/2 3/5 3/5 No. OF RECEIVERS ACTIVE IN SHUTDOWN 5 2 5 2 5 2 2 N/A 5 1 GUARANTEED DATA RATE (kbps) 120 120 230 230 235 120 120 120 120 120 EIA/TIA232 OR 562 232 232 562 562 232 232 232 232 232 232
PART
FEATURES
MAX212 MAX218 MAX562 MAX563 MAX3212 MAX3222 MAX3223 MAX3232 MAX3241 MAX3243
Drives mice Operates directly from batteries without a voltage regulator Wide supply range 0.1F capacitors AutoShutdown, complementary receiver, drives mice, transient detection 0.1F capacitors 0.1F capacitors, AutoShutdown 0.1F capacitors 0.1F capacitors, 2 complementary receivers, drives mice 0.1F capacitors, AutoShutdown, complementary receiver, drives mice
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+2.7V to +3.6V-Powered, 1A Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver
__________________Pin Configuration
TOP VIEW
LN 1 LP 2 VCC 3 EN 4 TRAN 5 INVALID 6 R5OUTB 7 R1OUT 8 R2OUT 9 R3OUT 10 R4OUT 11 R5OUT 12 T1IN 13 T2IN 14 28 GND 27 V+ 26 FORCEON 25 FORCEOFF
MAX3212
MAX3212
24 R1IN 23 R2IN 22 R3IN 21 R4IN 20 R5IN 19 T1OUT 18 T2OUT 17 T3OUT 16 V15 T3IN
SO/SSOP
TRANSISTOR COUNT: 1435
______________________________________________________________________________________
11
+2.7V to +3.6V-Powered, 1A Supply Current, 3-Driver/5-Receiver, True RS-232 Transceiver MAX3212
________________________________________________________Package Information
DIM A A1 B C D E e H 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 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
E
H
C
L
DIM PINS
e
A B D
A1
SSOP SHRINK SMALL OUTLINE PACKAGE
D D D D D
14 16 20 24 28
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
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
DIM PINS
E
H
W PACKAGE SMALL OUTLINE
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 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 (c) 1994 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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