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19-2770; Rev 0; 2/03
20Mbps, +3.3V, SOT23 RS-485/ RS-422 Transmitters
General Description
The MAX3293/MAX3294/MAX3295 low-power, highspeed transmitters for RS-485/RS-422 communication operate from a single +3.3V power supply. These devices contain one differential transmitter. The MAX3295 transmitter operates at data rates up to 20Mbps, with an output skew of less than 5ns, and a guaranteed driver propagation delay below 25ns. The MAX3293 (250kbps) and MAX3294 (2.5Mbps) are slew-rate limited to minimize EMI and reduce reflections caused by improperly terminated cables. The MAX3293/MAX3294/MAX3295 output level is guaranteed at +1.5V with a standard 54 load, compliant with RS-485 specifications. The transmitter draws 5mA of supply current when unloaded, and 1A in lowpower shutdown mode (DE = GND). Hot-swap circuitry eliminates false transitions on the data cable during circuit initialization or connection to a live backplane, and short-circuit current limiting and thermalshutdown circuitry protect the driver against excessive power dissipation. The MAX3293/MAX3294/MAX3295 are offered in a 6-pin SOT23 package, and are specified over the automotive temperature range. o Space-Saving 6-Pin SOT23 Package o 250kbps/2.5Mbps/20Mbps Data Rates Available o Operate from a Single +3.3V Supply o ESD Protection 9kV--Human Body Model o Slew-Rate Limited for Errorless Data Transmission (MAX3293/MAX3294) o 1A Low-Current Shutdown Mode o -7V to +12V Common-Mode Input Voltage Range o Current Limiting and Thermal Shutdown for Driver-Overload Protection o Hot-Swap Inputs for Telecom Applications o Automotive Temperature Range (-40C to +125C)
Features
MAX3293/MAX3294/MAX3295
Ordering Information
PART MAX3293AUT-T MAX3294AUT-T MAX3295AUT-T TEMP RANGE -40C to +125C -40C to +125C -40C to +125C PINPACKAGE 6 SOT23-6 6 SOT23-6 6 SOT23-6
Applications
RS-485/RS-422 Communications Clock Distribution Telecom Equipment Automotive Security Equipment Point-of-Sale Equipment Industrial Control
Selector Guide
PART MAX3293AUT-T MAX3294AUT-T MAX3295AUT-T MAXIMUM DATA RATE (Mbps) 0.25 2.5 20 SLEW-RATE LIMITED Yes Yes No TOP MARK ABNI ABNJ ABNK
Pin Configuration
TOP VIEW
DI 1 6 Y
DI DE
Typical Operating Circuit
120 Z D Y R RO
VCC 2
MAX3293 MAX3294 MAX3295
5
GND
DE 3
4
Z
MAX3293 MAX3294 MAX3295
MAX3280E MAX3281E MAX3283E MAX3284E
SOT23-6
________________________________________________________________ Maxim Integrated Products
1
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20Mbps, +3.3V, SOT23 RS-485/ RS-422 Transmitters MAX3293/MAX3294/MAX3295
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND, unless otherwise noted.) Supply Voltage (VCC).............................................................+6V DE, DI .......................................................................-0.3V to +6V Y, Z .........................................................................-7V to +12.5V Maximum Continuous Power Dissipation (TA = +70C) 6-Pin SOT23 (derate 6.25mW/C above +70C).........500mW Operating Temperature Ranges MAX32_ _EEUT...............................................-40C to +85C MAX32_ _EAUT ............................................-40C to +125C Storage Temperature Range .............................-65C to +160C Junction Temperature .....................................................+160C Lead Temperature (soldering, 10s) .................................+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 = +3.3V 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25C.) (Notes 1, 2)
PARAMETER POWER SUPPLY Supply Voltage Supply Current in Normal Operation Supply Current in Shutdown Mode DRIVER Figure 1, DE = VCC, DI = GND or VCC R = 50 (RS-422), TA +85C R = 27 (RS-485), TA +85C 2.0 1.5 VCC V VCC 0.2 -1 +3 0.2 V V V VCC IQ ISHDN No load, DI = VCC or GND, DE = VCC No load, DE = GND 1 3.135 3.300 3.465 5 10 V mA A SYMBOL CONDITIONS MIN TYP MAX UNITS
Differential Driver Output
VOD
Change in Magnitude of Differential Output Voltage Driver Common-Mode Output Voltage Change in Magnitude of CommonMode Voltage DRIVER LOGIC Input High Voltage Input Low Voltage Input Current
VOD VOC VOC
Figure 1, R = 27 or 50, DE = VCC (Note 3) Figure 1, R = 27 or 50, DE = VCC, DI = VCC or GND Figure 1, R = 27 or 50 (Note 3)
VIH VIL IIN
DE, DI DE, DI DE, DI Y, Z DE = GND, VCC = GND or +3.3V VIN = +12V VIN = -7V
2.0 0.8 -2 -20 -20 +25 -25 -250 +250 160 40 +2 +20
V V A
Output Leakage
IO
A +20 mA mA C C kV
Driver Short-Circuit Foldback Output Current Driver Short-Circuit Output Current Thermal-Shutdown Threshold Thermal-Shutdown Hysteresis ESD Protection
IOSFD IOSD TTS TTSH
(VCC - 1V) VOUT +12V, output high -7V VOUT 1V, output high 0 VOUT +12V, output low -7V VOUT VCC, output high
Y, Z
Human Body Model
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2
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20Mbps, +3.3V, SOT23 RS-485/ RS-422 Transmitters
SWITCHING CHARACTERISTICS (MAX3293)
(VCC = +3.3V 5%, TA = +25C, unless otherwise noted. Typical values are at VCC = +3.3V.)
PARAMETER Driver Propagation Delay Driver Differential Output Rise or Fall Time Driver Output Skew Differential Driver Output Skew Maximum Data Rate Driver Enable to Output High Driver Enable to Output Low Driver Disable Time from Low Driver Disable Time from High Device-to-Device Propagation Delay Matching tZH tZL tLZ tHZ SYMBOL tPLH tPHL tR tF tSKEW tDSKEW CONDITIONS Figures 2, 3; RDIFF = 54, CL = 50pF Figures 2, 3; RDIFF = 54, CL = 50pF Figures 2, 3; RDIFF = 54, CL = 50pF, tSKEW = | tPLH - tPHL | (Note 5) Figures 2, 3; RDIFF = 54, CL = 50pF Figures 2, 3; RDIFF = 54, CL = 50pF Figures 4, 5; S2 closed, RL = 500, CL = 100pF Figures 4, 5; S1 closed, RL = 500, CL = 100pF Figures 4, 5; S1 closed, RL = 500, CL = 100pF Figures 4, 5; S2 closed, RL = 500, CL = 100pF Same power supply, maximum temperature difference between devices = +30C (Note 5) MIN 400 400 400 400 -400 -100 250 2000 2000 1000 1000 900 TYP MAX 1300 1300 1200 1200 +400 +100 UNITS ns ns ns ns kbps ns ns ns ns ns
MAX3293/MAX3294/MAX3295
SWITCHING CHARACTERISTICS (MAX3294)
(VCC = +3.3V 5%, TA = +25C, unless otherwise noted. Typical values are at VCC = +3.3V.)
PARAMETER Driver Propagation Delay Driver Differential Output Rise or Fall Time Driver Output Skew Differential Driver Output Skew Maximum Data Rate Driver Enable to Output High Driver Enable to Output Low Driver Disable Time from Low Driver Disable Time from High Device-to-Device Propagation Delay Matching tZH tZL tLZ tHZ SYMBOL tPLH tPHL tR tF tSKEW tDSKEW CONDITIONS Figures 2, 3; RDIFF = 54, CL = 50pF Figures 2, 3; RDIFF = 54, CL = 50pF Figures 2, 3; RDIFF = 54, CL = 50pF, tSKEW = | tPLH - tPHL | (Note 5) Figures 2, 3; RDIFF = 54, CL = 50pF Figures 2, 3; RDIFF = 54, CL = 50pF Figures 4, 5; S2 closed, RL = 500, CL = 100pF Figures 4, 5; S1 closed, RL = 500, CL = 100pF Figures 4, 5; S1 closed, RL = 500, CL = 100pF Figures 4, 5; S2 closed, RL = 500, CL = 100pF Same power supply, maximum temperature difference between devices = +30C (Note 5) MIN 24 24 10 10 -40 -6 2.5 400 400 100 100 46 TYP MAX 70 70 70 70 +40 +6 UNITS ns ns ns ns Mbps ns ns ns ns ns
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20Mbps, +3.3V, SOT23 RS-485/ RS-422 Transmitters MAX3293/MAX3294/MAX3295
SWITCHING CHARACTERISTICS (MAX3295)
(VCC = +3.3V 5%, TA = +25C, unless otherwise noted. Typical values are at VCC = +3.3V.)
PARAMETER Driver Propagation Delay SYMBOL tPLH tPHL tR tF Driver Output Skew Differential Driver Output Skew Maximum Data Rate tSKEW tDSKEW CONDITIONS Figures 2, 3; RDIFF = 54, CL = 50pF TA = -40C to +125C Figures 2, 3; RDIFF = 54, CL = 50pF TA < +85C TA = -40C to +125C TA < +85C Figures 2, 3; RDIFF = 54, CL = 50pF, tSKEW = | tPLH - tPHL | Figures 2, 3; RDIFF = 54, CL = 50pF Figures 2, 3; RDIFF = 54, CL = 50pF, TA +85C Figures 2, 3; RDIFF = 54, CL = 50pF Driver Enable to Output High Driver Enable to Output Low Driver Disable Time from Low Driver Disable Time from High Device-to-Device Propagation Delay Matching tZH tZL tLZ tHZ Figures 4, 5; S2 closed, RL = 500, CL = 100pF Figures 4, 5; S1 closed, RL = 500, CL = 100pF Figures 4, 5; S1 closed, RL = 500, CL = 100pF Figures 4, 5; S2 closed, RL = 500, CL = 100pF Same power supply, maximum temperature difference between devices = +30C (Note 5) 20 16 400 400 100 100 25 ns ns ns ns ns 5 5 MIN TYP MAX 25 25 18.5 15 18.5 15 ns ns Mbps ns UNITS ns
Driver Differential Output Rise or Fall Time
Note 1: Devices production tested at +25C. Limits over the operating temperature range are guaranteed by design. Note 2: All currents into the device are positive; all currents out of the device are negative. All voltages are referenced to device ground, unless otherwise noted. Note 3: VOD and VOC are the changes in VOD and VOC, respectively, when the DI input changes state. Note 4: The maximum current applies to peak current just prior to foldback current limiting. Note 5: Not production tested. Guaranteed by design.
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20Mbps, +3.3V, SOT23 RS-485/ RS-422 Transmitters
Test Circuits and Timing Diagrams
Y R VOD R Z VOC OUTPUT UNDER TEST CL S2 RL S1 VCC
MAX3293/MAX3294/MAX3295
Figure 1. Driver DC Test Load
Figure 4. Enable/Disable Timing Test Load
3V
3V
DE 0V
1.5V
1.5V
DE DI Y VID Z RDIFF
CL
tZL(SHDN), tZL Y, Z VOL
tLZ VOL + 0.25V
2.3V OUTPUT NORMALLY LOW
CL
Y, Z 2.3V 0V
OUTPUT NORMALLY HIGH VOH - 0.25V tHZ
tZH(SHDN), tZH
Figure 2. Driver Timing Test Circuit
Figure 5. Driver Enable and Disable Times
3V DI 0V 1.5V
f = 1MHz, tR 3ns, tF 3ns 1.5V tPLH tPHL 1/2 VO
Z VO Y 1/2 VO VO VDIFF 0V -VO VDIFF = V (Y) - V (Z) 90% 10% tR tF tSKEW = | tPLH - tPHL | 90% 10%
Figure 3. Driver Propagation Delays
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20Mbps, +3.3V, SOT23 RS-485/ RS-422 Transmitters MAX3293/MAX3294/MAX3295
Typical Operating Characteristics
(VCC = +3.3V, TA = +25C, unless otherwise noted.)
MAX3295 SUPPLY CURRENT vs. DATA RATE
MAX3293-95 toc01
SUPPLY CURRENT vs. TEMPERATURE
MAX3293-95 toc02
SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE
DE = GND
MAX3293-95 toc03
25
DE = VCC NO LOAD TA = +85C TA = +125C
2.0
20 SUPPLY CURRENT (mA)
DE = VCC NO LOAD NO SWITCHING
2.0
SUPPLY CURRENT (mA)
SUPPLY CURRENT (A)
1.5
1.6
15 TA = +25C TA = -40C 5
1.2
1.0
10
0.8
0.5
0.4
0 0 5 10 DATA RATE (Mbps) 15 20
0 -40 -10 20 50 80 110 TEMPERATURE (C)
0 -40 -10 20 50 80 110 TEMPERATURE (C)
OUTPUT CURRENT vs. DIFFERENTIAL OUTPUT VOLTAGE
MAX3293-95 toc04
DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs. TEMPERATURE
MAX3293-95 toc05
DRIVER OUTPUT CURRENT vs. DRIVER OUTPUT LOW VOLTAGE
MAX3293-95 toc06
50
3.5 DIFFERENTIAL OUTPUT VOLTAGE (V)
120mA
40 OUTPUT CURRENT (mA)
3.0 RDIFF = 100 2.5
30
20
2.0 RDIFF = 54 1.5
10
0 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50
DIFFERENTIAL OUTPUT VOLTAGE (V)
1.0 -40 -10 20 50 80 110 0V 2V/div OUTPUT LOW VOLTAGE 12V TEMPERATURE (C)
OUTPUT CURRENT (20mA/div) 0mA
DRIVER OUTPUT CURRENT vs. DRIVER OUTPUT HIGH VOLTAGE
MAX3293-95 toc07
OUTPUT SKEW vs. TEMPERATURE
MAX3293-95 toc08
DRIVER PROPAGATION DELAY vs. TEMPERATURE
RDIFF = 54 CL = 50pF
MAX3293-95 toc09
4
40
120mA 3 OUTPUT CURRENT (20mA/div) OUTPUT SKEW (ns)
PROPAGATION DELAY (ns)
30 tPHL 20 tPLH 10
2
1 0mA -7V 5V 2V/div OUTPUT HIGH VOLTAGE 0 -40 -10 20 50 80 110 TEMPERATURE (C)
0 -40 -10 20 50 80 110 TEMPERATURE (C)
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20Mbps, +3.3V, SOT23 RS-485/ RS-422 Transmitters
Typical Operating Characteristics (continued)
(VCC = +3.3V, TA = +25C, unless otherwise noted.)
UNLOADED DRIVER OUTPUT WAVEFORM (fIN = 16Mbps)
MAX3293-95 toc12
MAX3293/MAX3294/MAX3295
DRIVER PROPAGATION DELAY
MAX3293-95 toc10
ENABLE RESPONSE TIME
MAX3293-95 toc11
DI 0V
DE 0V Y-Z 0V Y, Z
Y, Z 0V 0V 20ns/div Y, Z: 1V/div DI: 2V/div Y, Z, DE: 2V/div 40ns/div Y, Z: 1V/div 20ns/div
LOADED DRIVER OUTPUT WAVEFORM (fIN = 16Mbps)
MAX3293-95 toc13
EYE DIAGRAM (fIN = 20Mbps)
MAX3293-95 toc14
Y, Z
Y, Z
0V 20ns/div Y, Z: 500mV/div
0V 10ns/div Y, Z: 500mV/div
Pin Description
PIN 1 2 3 4 5 6 NAME DI VCC DE Z GND Y FUNCTION Driver Input. A logic low on DI forces the noninverting output (Y) low and the inverting output (Z) high. A logic high on DI forces the noninverting output (Y) high and the inverting output (Z) low. Positive Supply. VCC = +3.3V 5%. Bypass VCC to GND with a 0.1F capacitor. Driver Output Enable. Force DE high to enable driver. Pull DE low to disable the driver. Hot-swap input, see the Hot-Swap Capability section. Inverting RS-485/RS-422 Output Ground Noninverting RS-485/RS-422 Output
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20Mbps, +3.3V, SOT23 RS-485/ RS-422 Transmitters MAX3293/MAX3294/MAX3295
Detailed Description
The MAX3293/MAX3294/MAX3295 are low-power transmitters for RS-485/RS-422 communication. The MAX3295 operates at data rates up to 20Mbps, the MAX3294 up to 2.5Mbps (slew-rate limited), and the MAX3293 up to 250kbps (slew-rate limited). These devices are enabled using an active-high driver enable (DE) input. When disabled, outputs enter a high-impedance state, and the supply current reduces to 1A. The MAX3293/MAX3294/MAX3295 have a hot-swap input structure that prevents disturbance on the differential signal lines when a circuit board is plugged into a "hot" backplane (see the Hot-Swap Capability section). Drivers are also short-circuit current limited and are protected against excessive power dissipation by thermal-shutdown circuitry. cause coupling of VCC or GND to DE. These factors could improperly enable the driver. The MAX3293/MAX3294/MAX3295 eliminate all above issues with hot-swap circuitry. When V CC rises, an internal pulldown circuit holds DE low for approximately 10s. After the initial power-up sequence, the pulldown circuit becomes transparent, resetting the hot-swap tolerable input.
VCC 10s TIMER TIMER
Driver
The driver accepts a single-ended, logic-level input (DI) and translates it to a differential RS-485/RS-422 level output (Y and Z). Driving DE high enables the driver, while pulling DE low places the driver outputs (Y and Z) into a high-impedance state (see Table 1).
Low-Power Shutdown
Force DE low to disable the MAX3293/MAX3294/ MAX3295. In shutdown mode, the device consumes a maximum of 10A of supply current.
EN
5.6k
DE (HOT SWAP) 2mA 100A
Hot-Swap Capability
Hot-Swap Input When circuit boards are inserted into a "hot" or powered backplane, disturbances to the enable can lead to data errors. Upon initial circuit board insertion, the processor undergoes its power-up sequence. During this period, the output drivers are high impedance and are unable to drive the DE input of the MAX3293/ MAX3294/MAX3295 to a defined logic level. Leakage currents up to 10A from the high-impedance output could cause DE to drift to an incorrect logic state. Additionally, parasitic circuit board capacitance could
M1
M2
Figure 6. Simplified Structure of the Driver Enable Input (DE)
DIFFERENTIAL POWER-UP GLITCH (0.1V/s)
VCC 2V/div 0V
Table 1. MAX3293/MAX3294/ MAX3295 (RS-485/RS-422) Transmitting Function Table
INPUTS DE 0 1 1 DI X 0 1 OUTPUTS Y Z Shutdown Shutdown 0 1 1 0
Y
10mV/div AC-COUPLED 10mV/div AC-COUPLED
Z
Y-Z
20mV/div
4s/div
X = Don't care. 8
Figure 7. Differential Power-Up Glitch (0.1V/s)
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20Mbps, +3.3V, SOT23 RS-485/ RS-422 Transmitters
Hot-Swap Input Circuitry The MAX3293/MAX3294/MAX3295 enable input features hot-swap capability. At the input, there are two NMOS devices, M1 and M2 (Figure 6). When V CC ramps from zero, an internal 10s timer turns on M2 and sets the SR latch, which also turns on M1. Transistors M2, a 2mA current sink, and M1, a 100A current sink, pull DE to GND through a 5.6k resistor. M2 is designed to pull DE to the disabled state against an external parasitic capacitance up to 100pF that may drive DE high. After 10s, the timer deactivates M2 while M1 remains on, holding DE low against threestate leakages that can drive DE high. M1 remains on until an external source overcomes the required input current. At this time, the SR latch resets and M1 turns
DIFFERENTIAL POWER-UP GLITCH (1V/s)
VCC 2V/div 0V 100mV/div AC-COUPLED 100mV/div AC-COUPLED
off. When M1 turns off, DE reverts to a standard, highimpedance CMOS input. Whenever VCC drops below 1V, the hot-swap input is reset.
MAX3293/MAX3294/MAX3295
Hot-Swap Line Transient
During a hot-swap event when the driver is connected to the line and is powered up, the driver must not cause the differential signal to drop below 200mV. Figures 7, 8, and 9 show the results of the MAX3295 during power-up for three different V CC ramp rates (0.1V/s, 1V/s, and 10V/s). The photos show the VCC ramp, the singleended signal on each side of the 100 termination, as well as the differential signal across the termination.
ESD Protection
Human Body Model Figure 10 shows the Human Body Model, and Figure 11 shows the current waveform it generates when discharged into low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the device through a 1.5k resistor.
Y
RC 1M CHARGE-CURRENTLIMIT RESISTOR
RD 1.5k DISCHARGE RESISTANCE STORAGE CAPACITOR DEVICE UNDER TEST
Z
Y-Z
200mV/div
1s/div
HIGHVOLTAGE DC SOURCE
Cs 100pF
Figure 8. Differential Power-Up Glitch (1V/s) Figure 10. Human Body ESD Test
DIFFERENTIAL POWER-UP GLITCH (10V/s)
VCC 2V/div 0V 50mV/div AC-COUPLED 50mV/div AC-COUPLED
IP 100% 90% AMPERES 36.8% 10% 0V 0V tRL
Ir
PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE)
Y Z
Y-Z
TIME tDL CURRENT WAVEFORM
100mV/div 200ns/div
Figure 9. Differential Power-Up Glitch (10V/s)
Figure 11. Current Waveform 9
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20Mbps, +3.3V, SOT23 RS-485/ RS-422 Transmitters MAX3293/MAX3294/MAX3295
Reduced EMI and Reflections (MAX3293/MAX3294)
The MAX3293/MAX3294 are slew-rate limited, minimizing EMI and reducing reflections caused by improperly terminated cables. Figure 12 shows Fourier analysis of the MAX3295 transmitting a 125kHz signal. High-frequency harmonics with large amplitudes are evident. Figure 13 shows the same information, but for the slewrate-limited MAX3293, transmitting the same signal. The high-frequency harmonics have much lower amplitudes, and the potential for EMI is significantly reduced. To minimize reflections, the line should be terminated at both ends in its characteristic impedance, and stub lengths off the main line should be kept as short as possible. The slew-rate-limited MAX3293 and MAX3294 are more tolerant of imperfect termination.
Driver Output Protection
Two mechanisms prevent excessive output current and power dissipation caused by faults or by bus contention. The first, a foldback current limit on the output stage, provides immediate protection against short circuits over the whole common-mode voltage range (see the Typical Operating Characteristics). The second, a thermal-shutdown circuit, forces the driver outputs into a high-impedance state if the die temperature exceeds +160C.
Chip Information
TRANSISTOR COUNT: 263 PROCESS: BiCMOS
DRIVER OUTPUT WAVEFORM AND FFT PLOT OF MAX3295
DRIVER OUTPUT WAVEFORM AND FFT PLOT OF MAX3293
10dB/div
10dB/div
Figure 12. Driver Output Waveform and FFT Plot of MAX3295 Transmitting a 125kHz Signal
Figure 13. Driver Output Waveform and FFT Plot of MAX3293 Transmitting a 125kHz Signal
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20Mbps, +3.3V, SOT23 RS-485/ RS-422 Transmitters
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
6LSOT.EPS
MAX3293/MAX3294/MAX3295
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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