MAX3295AUT+T ,20Mbps, +3.3V, SOT23 RS-485/RS-422 TransmittersFeaturesThe MAX3293/MAX3294/MAX3295 low-power, high- ● Space-Saving 6-Pin SOT23 Packagespeed transm ..
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MAX6955AAX ,2-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key ScanFeatures2The MAX6955 is a compact display driver that interfaces 400kbps 2-Wire Interface Compatib ..
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MAX6955AAX+ ,2-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key ScanApplicationsFunctional DiagramSet-Top Boxes Bar Graph DisplaysPanel Meters Audio/Video EquipmentGPI ..
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MAX6956AAI+ ,2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port LED Display Driver and I/O ExpanderApplicationsTOP VIEWSet-Top Boxes Bar Graph DisplaysISET 1 28 V+Panel Meters Industrial Controllers ..
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MAX3293AUT+T-MAX3294AUT+-MAX3294AUT+T-MAX3295AUT+-MAX3295AUT+T
20Mbps, +3.3V, SOT23 RS-485/RS-422 Transmitters
General DescriptionThe MAX3293/MAX3294/MAX3295 low-power, high-
speed transmitters for RS-485/RS-422 commu-
nication 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 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 guar-
anteed at +1.5V with a standard 54Ω load, compliant
with RS-485 specifications. The transmitter draws 5mA
of supply current when unloaded, and 1µA in low-power
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 ther-
mal-shutdown circuitry protect the driver against exces-
sive power dissipation.
The MAX3293/MAX3294/MAX3295 are offered in a
6-pin SOT23 package, and are specified over the
automotive temperature range.
Applications●RS-485/RS-422 Communications●Clock Distribution●Telecom Equipment●Automotive●Security Equipment●Point-of-Sale Equipment●Industrial Control
Features●Space-Saving 6-Pin SOT23 Package●250kbps/2.5Mbps/20Mbps Data Rates Available●Operate from a Single +3.3V Supply●ESD Protection ±9kV–Human Body Model●Slew-Rate Limited for Errorless Data Transmission
(MAX3293/MAX3294)●1µA Low-Current Shutdown Mode●-7V to +12V Common-Mode Input Voltage Range●Current Limiting and Thermal Shutdown for
Driver-Overload Protection●Hot-Swap Inputs for Telecom Applications●Automotive Temperature Range (-40°C to +125°C)
Pin Configuration appears at end of data sheet.+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
/V denotes automotive-qualified package.
PART
MAXIMUM
DATA RATE
(Mbps)
SLEW-
RATE
LIMITED
TOP
MARKMAX3293AUT+T0.25YesABNI or
ABVH
MAX3294AUT+T2.5YesABNJ or
ABVI
MAX3295AUT+T20NoABNK or
ABVJ
MAX3295AUT/V+T20No+ACSB
PARTTEMP RANGEPIN-PACKAGE
MAX3293AUT+T-40°C to +125°C6 SOT23-6
MAX3294AUT+T-40°C to +125°C6 SOT23-6
MAX3295AUT+T-40°C to +125°C6 SOT23-6
MAX3295AUT/V+T-40°C to +125°C6 SOT23-6
MAX3293
MAX3294
MAX3295
MAX3280E
MAX3281E
MAX3283E
MAX3284ERO
120Ω
MAX3293–MAX329520Mbps, +3.3V, SOT23 RS-485/
RS-422 Transmitters
Selector Guide
Ordering Information
Typical Operating Circuit
(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 = +70°C)
SOT23 (derate 8.2mW/°C above +70°C) .................654.1mW
Operating Temperature Ranges
MAX32_ _AUT ..............................................-40°C to +125°C
Storage Temperature Range ............................-65°C to +160°C
Junction Temperature .....................................................+160°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
(VCC = +3.3V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) (Notes 1, 2)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
POWER SUPPLYSupply VoltageVCC3.1353.3003.465V
Supply Current in Normal
OperationIQNo load, DI = VCC or GND, DE = VCC5mA
Supply Current in Shutdown ModeISHDNNo load, DE = GND110µA
DRIVERDifferential Driver OutputVODFigure 1, DE = VCC,
DI = GND or VCC
R = 50Ω (RS-422),
TA ≤ +85°C2.0VCCR = 27Ω (RS-485),
TA ≤ +85°C1.5VCC
Change in Magnitude of
Differential Output Voltage∆VODFigure 1, R = 27Ω or 50Ω,
DE = VCC (Note 3)0.2V
Driver Common-Mode
Output VoltageVOCFigure 1, R = 27Ω or 50Ω,
DE = VCC, DI = VCC or GND-1+3V
Change in Magnitude of
Common-Mode Voltage∆VOCFigure 1, R = 27Ω or 50Ω (Note 3)0.2V
DRIVER LOGICInput High VoltageVIHDE, DI2.0V
Input Low VoltageVILDE, DI0.8V
Input CurrentIINDE, DI-2+2µA
Output Leakage IO
Y, Z
DE = GND,
VCC = GND or
+3.3V
VIN = +12V-20+20
VIN = -7V-20+20
Driver Short-Circuit Foldback
Output CurrentIOSFD(VCC - 1V) ≤ VOUT ≤ +12V, output high+25mA-7V ≤ VOUT ≤ 1V, output high-25
Driver Short-Circuit
Output CurrentIOSD0 ≤ VOUT ≤ +12V, output low-250mA-7V ≤ VOUT ≤ VCC, output high+250
Thermal-Shutdown ThresholdTTS160°C
MAX3293–MAX329520Mbps, +3.3V, SOT23 RS-485/
RS-422 Transmitters
Electrical CharacteristicsStresses 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.
Absolute Maximum Ratings
(VCC = +3.3V ±5%, TA = +25°C, unless otherwise noted. Typical values are at VCC = +3.3V.)
(VCC = +3.3V ±5%, TA = +25°C, unless otherwise noted. Typical values are at VCC = +3.3V.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSDriver Propagation DelaytPLHFigures 2, 3; RDIFF = 54Ω,
CL = 50pF70nstPHL2470
Driver Differential Output Rise or
Fall TimeFigures 2, 3; RDIFF = 54Ω,
CL = 50pF70nstF1070
Driver-Output SkewtSKEWFigures 2, 3; RDIFF = 54Ω, CL = 50pF,
tSKEW = | tPLH - tPHL | (Note 5)-40+40ns
Differential Driver-Output SkewtDSKEWFigures 2, 3; RDIFF = 54Ω, CL = 50pF-6+6ns
Maximum Data RateFigures 2, 3; RDIFF = 54Ω, CL = 50pF2.5Mbps
Driver Enable to Output HightZHFigures 4, 5; S2 closed, RL = 500Ω,
CL = 100pF400ns
Driver Enable to Output LowtZLFigures 4, 5; S1 closed, RL = 500Ω,
CL = 100pF400ns
Driver Disable Time from LowtLZFigures 4, 5; S1 closed, RL = 500Ω,
CL = 100pF100ns
Driver Disable Time from HightHZFigures 4, 5; S2 closed, RL = 500Ω,
CL = 100pF100ns
Device-to-Device Propagation
Same power supply, maximum temperature
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSDriver Propagation DelaytPLHFigures 2, 3; RDIFF = 54Ω,
CL = 50pF
4001300nstPHL4001300
Driver Differential Output Rise
or Fall TimeFigures 2, 3; RDIFF = 54Ω,
CL = 50pF
4001200nstF4001200
Driver-Output SkewtSKEWFigures 2, 3; RDIFF = 54Ω, CL = 50pF,
tSKEW = | tPLH - tPHL | (Note 5)-400+400ns
Differential Driver-Output SkewtDSKEWFigures 2, 3; RDIFF = 54Ω, CL = 50pF-100+100ns
Maximum Data RateFigures 2, 3; RDIFF = 54Ω, CL = 50pF250kbps
Driver Enable to Output HightZHFigures 4, 5; S2 closed, RL = 500Ω,
CL = 100pF2000ns
Driver Enable to Output LowtZLFigures 4, 5; S1 closed, RL = 500Ω,
CL = 100pF2000ns
Driver Disable Time from LowtLZFigures 4, 5; S1 closed, RL = 500Ω,
CL = 100pF1000ns
Driver Disable Time from HightHZFigures 4, 5; S2 closed, RL = 500Ω,
CL = 100pF1000ns
Device-to-Device Propagation
Delay Matching
Same power supply, maximum temperature
difference between devices = +30°C (Note 5)900ns
MAX3293–MAX329520Mbps, +3.3V, SOT23 RS-485/
RS-422 Transmitters
Switching Characteristics (MAX3294)
Switching Characteristics (MAX3293)
Note 1: Devices production tested at +25°C. 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: Guaranteed by design; not production tested.
(VCC = +3.3V ±5%, TA = +25°C, unless otherwise noted. Typical values are at VCC = +3.3V.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSDriver Propagation DelaytPLHFigures 2, 3; RDIFF = 54Ω, CL = 50pF25nstPHL25
Driver Differential Output Rise
or Fall TimeFigures 2, 3;
RDIFF = 54Ω,
CL = 50pF
TA = -40°C to +125°C18.5TA < +85°C15
TA = -40°C to +125°C18.5
TA < +85°C15
Driver-Output SkewtSKEWFigures 2, 3; RDIFF = 54Ω, CL = 50pF,
tSKEW = | tPLH - tPHL |5ns
Differential Driver-Output SkewtDSKEWFigures 2, 3; RDIFF = 54Ω, CL = 50pF5ns
Maximum Data Rate
Figures 2, 3; RDIFF = 54Ω, CL = 50pF,
TA ≤ +85°C20Mbps
Figures 2, 3; RDIFF = 54Ω, CL = 50pF16
Driver Enable to Output HightZHFigures 4, 5; S2 closed, RL = 500Ω,
CL = 100pF400ns
Driver Enable to Output LowtZLFigures 4, 5; S1 closed, RL = 500Ω,
CL = 100pF400ns
Driver Disable Time from LowtLZFigures 4, 5; S1 closed, RL = 500Ω,
CL = 100pF100ns
Driver Disable Time from HightHZFigures 4, 5; S2 closed, RL = 500Ω,
CL = 100pF100ns
Device-to-Device Propagation
Delay Matching
Same power supply, maximum temperature
difference between devices = +30°C (Note 5)25ns
MAX3293–MAX329520Mbps, +3.3V, SOT23 RS-485/
RS-422 Transmitters
Switching Characteristics (MAX3295)
Figure 5. Driver Enable and Disable Times
Figure 4. Enable/Disable Timing Test Load
Figure 3. Driver Propagation Delays
Figure 2. Driver Timing Test Circuit
Figure 1. Driver DC Test Load
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
Y, Z
VOL
Y, Z
1.5V1.5V
VOL + 0.25V
VOH - 0.25V2.3V
2.3V
tZL(SHDN), tZLtLZ
tZH(SHDN), tZHtHZ
OUTPUT
UNDER TEST
VCC
-VO
1.5V
1/2 VO
1/2 VOtPLHtR
tPHL
10%
90%90%
1.5V
10%
VDIFF = V (Y) - V (Z)
tSKEW = | tPLH - tPHL |
VDIFF
f = 1MHz, tR 3ns, tF 3ns
VID
RDIFF
VODVOC
MAX3293–MAX329520Mbps, +3.3V, SOT23 RS-485/
RS-422 Transmitters
Test Circuits and Timing Diagrams
(VCC = +3.3V, TA = +25°C, unless otherwise noted.)
MAX3293-95 toc09
PROPAGATION DELAY (ns)
DRIVER PROPAGATION DELAY
vs. TEMPERATURE
tPHL
tPLH
RDIFF = 54Ω
CL = 50pF
OUTPUT SKEW vs. TEMPERATUREMAX3293-95 toc08
OUTPUT SKEW (ns)
DRIVER-OUTPUT CURRENT
vs. DRIVER-OUTPUT HIGH VOLTAGE
MAX3293-95 toc07
OUTPUT CURRENT (mA)
DRIVER-OUTPUT CURRENT
vs. DRIVER-OUTPUT LOW VOLTAGE
MAX3293-95 toc06
OUTPUT LOW VOLTAGE (V)
OUTPUT CURRENT (mA)
MAX3293-95 toc05
TEMPERATURE (C)
DIFFERENTIAL OUTPUT VOLTAGE (V)
DRIVER DIFFERENTIAL OUTPUT VOLTAGE
vs. TEMPERATURE
RDIFF = 54Ω
RDIFF = 100Ω
OUTPUT CURRENT
vs. DIFFERENTIAL OUTPUT VOLTAGE
MAX3293-95 toc04
DIFFERENTIAL OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
MAX3293-95 toc03
TEMPERATURE (C)
SUPPLY CURRENT (
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
DE = GND
SUPPLY CURRENT vs. TEMPERATURE
MAX3293-95 toc02
TEMPERATURE (C)
SUPPLY CURRENT (mA)
DE = VCC
NO LOAD
NO SWITCHING
MAX3295
SUPPLY CURRENT vs. DATA RATEMAX3293-95 toc01
DATA RATE (Mbps)
SUPPLY CURRENT (mA)1051520
DE = VCC
NO LOAD
TA = +85C
TA = +125C
TA = +25C
TA = -40C
MAX3293–MAX329520Mbps, +3.3V, SOT23 RS-485/
RS-422 Transmitters
Typical Operating Characteristics
