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MAX3173CAI+ |MAX3173CAIMAXIMN/a368avai+3.3V Multiprotocol 3Tx/3Rx Software-Selectable Control Transceivers
MAX3171CAI+ |MAX3171CAIMAXN/a70avai+3.3V Multiprotocol 3Tx/3Rx Software-Selectable Control Transceivers
MAX3171CAI+ |MAX3171CAIMAXINN/a244avai+3.3V Multiprotocol 3Tx/3Rx Software-Selectable Control Transceivers


MAX3173CAI+ ,+3.3V Multiprotocol 3Tx/3Rx Software-Selectable Control TransceiversELECTRICAL CHARACTERISTICS(V = 3.3V ±5%; C1 = C2 = 1µF, C3 = C4 = C5 = 3.3µF, and T = T to T , unle ..
MAX3174CAI ,#.3V Multiprotocol Software-Selectable Cable Terminators and TransceiversFeaturesThe MAX3172/MAX3174 contain five software-selec- Industry’s First +3.3V Multiprotocol Term ..
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MAX639ESA-T ,5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC ConvertersApplicationsMAX639ESA -40°C to +85°C 8 SO9V Battery to 5V, 3.3V, or 3V ConversionMAX639MJA -55°C to ..
MAX640 ,5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC ConvertersApplicationsMAX639ESA -40°C to +85°C 8 SO9V Battery to 5V, 3.3V, or 3V ConversionMAX639MJA -55°C to ..
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MAX3171CAI+-MAX3173CAI+
+3.3V Multiprotocol 3Tx/3Rx Software-Selectable Control Transceivers
General Description
The MAX3171/MAX3173 are three-driver/three-receiver
multiprotocol transceivers that operate from a single
+3.3V supply. The MAX3171/MAX3173, along with the
MAX3170 and MAX3172/MAX3174, form a complete
software-selectable data terminal equipment (DTE) or
data communications equipment (DCE) interface port
that supports V.28 (RS-232) and V.10/V.11 (RS-449,
V.36, EIA-530, EIA-530-A, X.21, RS-423) protocols. The
MAX3171/MAX3173 transceivers carry the serial inter-
face control signaling; the MAX3170 transceivers carry
the clock and data signals. The MAX3172/
MAX3174 have an extra transceiver for applications
requiring four transceivers for control signaling.
An internal charge pump and proprietary low-dropout
transmitter output stage allow V.28, V.11, and V.10
compliant operation from a single +3.3V supply. A no-
cable mode is entered when all mode pins (M0, M1,
and M2) are pulled high or left unconnected. In no-
cable mode, supply current decreases to 2mA and all
transmitter and receiver outputs are disabled (high
impedance). Short-circuit limiting and thermal-shut-
down circuits protect the drivers against excessive
power dissipation.
The MAX3171 features 10µs deglitching on the
V.10/V.11/V.28 receiver inputs. The MAX3173 is avail-
able for applications that do not require deglitching on
the serial handshake signals.
These parts require only four surface-mount capacitors
for charge-pump operation in addition to supply
bypassing.
Features
Industry’s First +3.3V Multiprotocol TransceiverCertified TBR-1 and TBR-2 Compliant
(NET1 and NET2)
Supports V.28 (RS-232) and V.10/V.11 (RS-449,
V.36, EIA-530, EIA-530-A, X.21, RS-423) Protocols
3V/5V Logic CompatibilitySoftware-Selectable DCE/DTETrue Fail-Safe Receiver OperationAvailable in Small 28-Pin SSOP Package10µs Receiver Input Deglitching (MAX3171 only)All Transmitter Outputs Fault Protected to ±15V,
Tolerate Cable Miswiring
________________________Applications

Data NetworkingPCI Cards
CSU and DSUTelecommunications
Data Routers
MAX3171/MAX3173
+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceivers

19-1703; Rev 1; 8/01
Ordering Information
PART TEMP. RANGE PIN-PACKAGEMAX3171CAI 0°C to +70°C 28 SSOPMAX3173CAI 0°C to +70°C 28 SSOPD2D3R1R2R3
MAX3170
RXDRXCTXDTXCSCTED3R1R2R3MAX3171
MAX3173
MAX3172
MAX3174
CTSDSRRTSDTRLLDCD
CTS BCTS ADSR BDSR A
DCD BDCD A
DTR BDTR A
RTS BRTS A
LL A
RXD ARXD BRXC BRXC ATXC BTXC A
SCTE BSCTE A
TXD BTXD ADB-25 CONNECTOR51082262320194171618391712151124142ypical Operating Circuit
Pin Configuration appears at end of data sheet
MAX3171/MAX3173
+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceivers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VCC= 3.3V ±5%; C1 = C2 = 1µF, C3 = C4 = C5 = 3.3µF, and TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC
= +3.3V, TA= +25°C.) (Note 2)
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.
Note 1:
V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
(All voltages referenced to GND unless otherwise noted.)
Supply Voltages
VCC......................................................................-0.3V to +4V
V+ (Note 1)..........................................................-0.3V to +7V
V- (Note 1)...........................................................+0.3V to -7V
V+ to V- (Note 1)...............................................................13V
Logic Input Voltages
M0, M1, M2, DCE/DTE,T_IN...............................-0.3V to +6V
Logic Output Voltages
R_OUT...................................................-0.3V to (VCC+ 0.3V)
Short-Circuit Duration............................................Continuous
Transmitter Outputs
T_OUT_...............................................................-15V to +15V
Short-Circuit Duration........................................................60s
Receiver Inputs
R_IN_..................................................................-15V to +15V
Continuous Power Dissipation (TA= +70°C)
28-Pin SSOP (derate 11.1mW/°C above +70°C)........889mW
Operating Temperature Range
MAX3171CAI/MAX3173CAI...............................0°C to +70°C
Storage Temperature Range............................-65°C to +150°C
Lead Temperature (soldering, 10s)................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
DC CHARACTERISTICS

V.11/V.10 modes220300
V.11/V.10 modes (no load)623
V.28 mode2440
V.28 mode (no load)623
Supply Current
(DCE Mode, Digital Inputs =
GND or VCC, Transmitter
Outputs Static)
ICC
No-cable mode28
V.11/V.10 modes (no load)20
V.11/V.10 modes (full load)450
V.28 mode (full load)40Internal Power DissipationPD
No-cable mode6.6
V.11/V.10 modes (no load)4.4
V.11/V.10 modes (full load)4.2
V.28 mode5.55V+ Output VoltageV+
No-cable mode4.6
V.11/V.10 modes (no load)-4.0
V.11/V.10 modes (full load)-3.8
V.28 mode-5.45V- Output VoltageV-
No-cable mode-4.2
Charge-Pump Enable TimeDelay until V+ and V- specifications met1ms
LOGIC INPUTS (M0, M1, M2, DCE/DTE, T_IN)

Input High VoltageVIH2.0V
Input Low VoltageVIL0.8V
T_IN±1
M0, M1, M2, DCE / DTE = VCC±1Logic Input CurrentIIH, IIL
M0, M1, M2, DCE / DTE = GND3050100
MAX3171/MAX3173
+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceivers
ELECTRICAL CHARACTERISTICS (continued)

(VCC= 3.3V ±5%; C1 = C2 = 1µF, C3 = C4 = C5 = 3.3µF, and TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
LOGIC OUTPUTS (R_OUT)

Output High VoltageVOHISOURCE = 1.0mAVCC - 1.0V
Output Low VoltageVOLISINK = 1.6mA0.4V
Rise or Fall Timetr, tf10% to 90%, Figure 415ns
R_OUT = GND3050100Output Leakage Current
(Receiver Output Three-Stated)R_OUT = VCC±1µA
TRANSMITTER OUTPUTS

Output Leakage CurrentIZ-0.25V ≤ VOUT ≤ +0.25V, power off or
no-cable mode-100100µA
V.28240
V.10115kbpsData Rate
V.1110Mbps
Minimum pulse width passed5Receiver Glitch Rejection
(MAX3171 only)Minimum pulse width rejected15µs
-10V ≤ VAB ≤ +10V, VA or VB grounded,
V.11/V.35, no-cable mode2040Receiver Input ResistanceRIN
-15V ≤ VA ≤ +15V, V.28 mode357
V.10/V.2864MAX3171V.1164
V.10/V.28240
kbpsData Rate
MAX3173V.1110Mbps
V.11 TRANSMITTER

Unloaded Differential Output
VoltageVODOR = 1.95kΩ, Figure 14.06.0V
Loaded Differential Output
VoltageVODLR = 50Ω, Figure 10.5 ✕ VODOV
Change in Magnitude of Output
Differential VoltageΔVODR = 50Ω, Figure 10.2V
Common-Mode Output VoltageVOCR = 50Ω, Figure 13.0V
Change in Magnitude of Output
Common-Mode VoltageΔVOCR = 50Ω, Figure 10.2V
Short-Circuit CurrentISCT_OUTA/B = GND60150mA
Rise or Fall Timetr, tf10% to 90%, Figure 21025ns
Transmitter Input to OutputtPHL, tPLHFigure 25080ns
Data Skew| tPHL - tPLH |Figure 2210ns
Output-to-Output SkewtSKEWFigure 22ns
Channel-to-Channel Skew2ns
V.11 RECEIVER

Differential Threshold VoltageVTH-7V ≤ VCM ≤ +7V-200-100-25mV
MAX3171/MAX3173
+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceivers
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

MAX317151015µsReceiver Input to OutputtPHL, tPLHMAX317360120ns
MAX31710.54µsData Skew| tP H L - tP LH | MAX3173516ns
V.10 TRANSMITTER

Unloaded Output VoltageVODORL = 3.9kΩ, Figure 3±4.0±4.4±6.0V
Loaded Output Voltage SwingVODLRL = 450Ω, Figure 3 0.9 ✕
VODOV
Short-Circuit CurrentISCT_OUTA = GND±100±150mA
Transmitter Rise or Fall Timetr, tfRL = 450Ω, CL = 100pF, Figure 32µs
Transmitter Input to OutputtPHL, tPLHRL = 450Ω, CL = 100pF, Figure 32µs
Data Skew| tP H L - tP LH | RL = 450Ω, CL =100pF, Figure 350ns
V.10 RECEIVER

Threshold VoltageVTH+25+100+300mV
Input HysteresisΔVTH15mV
MAX3171, Figure 451015µsReceiver Input to OutputtPHL, tPLHMAX3173, Figure 460120ns
MAX3171, Figure 40.54µsData Skew| tP H L - tP LH | MAX3173, Figure 4516ns
V.28 TRANSMITTER

All transmitters loaded with RL = 3kΩ±5.0±5.4Output Voltage SwingVONo load±6.5V
Short-Circuit CurrentISCT_OUTA = GND±25±60mA
RL = 3kΩ, CL = 2500pF, measured from +3V
to -3V or from -3V to +3V, Figure 3430
Output Slew RateSR
RL = 7kΩ, CL = 150pF, measured from +3V
to -3V or from -3V to +3V, Figure 3630
V/µs
Transmitter Input to OutputtPHL, tPLHFigure 31µs
Data Skew| tP H L - tP LH | Figure 3100ns
V.28 RECEIVER

Input Threshold LowVIL0.8V
Input Threshold HighVIH2.0V
Input HysteresisVHYS0.5V
MAX3171, Figure 451015Propagation DelaytPLH, tPHLMAX3173, Figure 4200µs
MAX3171, Figure 40.54.0µsData Skew| tP H L - tP LH | MAX3173, Figure 4100ns
ELECTRICAL CHARACTERISTICS (continued)

(VCC= 3.3V ±5%; C1 = C2 = 1µF, C3 = C4 = C5 = 3.3µF, and TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC
= +3.3V, TA= +25°C.) (Note 2)
Note 2:
V+ and V- are also used to supply the MAX3172/MAX3174. The MAX3171/MAX3173 are tested with additional current load
on V+ and V- to capture the effect of loading from the MAX3172/MAX3174 in all operation modes.
MAX3171/MAX3173
+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceivers

V.10/V.11 MODE SUPPLY CURRENT vs.
DATA RATE
MAX3171 toc01
DATA RATE (kbps)
SUPPLY CURRENT (mA)
0.0010.0110k100k0.11k1000k
NO LOAD
FULL LOAD
V.28 MODE SUPPLY CURRENT
vs. DATA RATE

MAX3171 toc02
DATA RATE (kbps)
SUPPLY CURRENT (mA)
0.0010.0110k100k0.11k1000k
FULL LOAD
NO LOAD
V.11 LOADED DIFFERENTIAL
OUTPUT VOLTAGE vs. TEMPERATURE
MAX3171 toc03
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
VOUT+
VOUT-
RL = 100Ω
Typical Operating Characteristics

(VCC= +3.3V, C1 = C2 = 1.0µF, C3 = C4 = C5 = 3.3µF, TA= +25°C, unless otherwise noted.)
V.28 LOADED OUTPUT VOLTAGE
vs. TEMPERATURE
MAX3171 toc04
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
VOUT+
VOUT-
RL = 3kΩ
V.10 LOADED OUTPUT VOLTAGE
vs. TEMPERATURE
MAX3171 toc05
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
VOUT+
VOUT-
RL = 450Ω
V.10/V.11 RECEIVER INPUT CURRENT
vs. INPUT VOLTAGE
MAX3171 toc06
INPUT VOLTAGE (V)
INPUT CURRENT (mA)
V.28 RECEIVER INPUT CURRENT
vs. INPUT VOLTAGE
MAX3171 toc07
INPUT CURRENT (mA)10005001500200025003000
V.28 SLEW RATE
vs. LOAD CAPACITANCE

MAX3171toc11
SLEW RATE (V/+SLEW
-SLEW
V.10 TRANSMITTER RISE AND FALL TIMES
vs. LOAD CAPACITANCE
MAX3171toc12
RISE/FALL TIME (FALL
RISE
MAX3171/MAX3173
+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceivers
Typical Operating Characteristics (continued)

(VCC= +3.3V, C1 = C2 = 1.0µF, C3 = C4 = C5 = 3.3µF, TA= +25°C, unless otherwise noted.)
TIN2
TOUT2/
RIN2
ROUT2
5V/div
10μs/div
MAX3173 LOOPBACK SCOPE PHOTO
530A MODE (UNLOADED)

MAX3171 toc10
TIN
TOUT/
RIN
ROUT
5V/div
10μs/div
MAX3173 LOOPBACK SCOPE PHOTO
V.11 MODE (UNLOADED)

MAX3171 toc08
TIN
TOUT/
RIN
ROUT
5V/div
10μs/div
MAX3171 LOOPBACK SCOPE PHOTO
V.28 MODE (RL = 3kΩ)

MAX3171 toc09
Figure 1. V.11 DC Test CircuitFigure 2. V.11 AC Test Circuit
100pF
50pF
100pF
100ΩRxTxest Circuits
VOC
VOD
MAX3171/MAX3173
+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceiver
Pin Description
PINNAMEFUNCTION

1V+Positive Supply Generated by the Charge Pump (connect to V+ pin of MAX3172/MAX3174).
Bypass V+ to ground with a 3.3µF ceramic capacitor.C2+Positive Terminal of the Inverting Charge-Pump Capacitor. Connect C2+ to C2- with a 1µF
ceramic capacitor.
3C2-Negative Terminal of the Inverting Charge-Pump Capacitor. Connect C2+ to C2- with a 1µF
ceramic capacitor.
4V-Negative Supply Generated by the Charge Pump (connect to V- pin of MAX3172/MAX3174).
Bypass V- to ground with a 3.3µF ceramic capacitor.
5, 6, 7T_INTransmitter CMOS Inputs (T1IN, T2IN, T3IN)
8, 9, 10R_OUTReceiver CMOS Outputs (R1OUT, R2OUT, R3OUT)
11, 12, 13M_Mode Select Inputs (M0, M1, M2). Internally pulled up to VCC. See Table 1 for detailed
information.DCE/DTEDCE/DTE Mode Select Input. Logic level high selects DCE interface; logic level low selects
DTE interface. Internally pulled up to VCC.
15, 18R_INBNoninverting Receiver Inputs (R3INB, R2INB)
16, 17R_INAInverting Receiver Inputs (R3INA, R2INA)T3OUTB/R1INBNoninverting Transmitter Output/Noninverting Receiver InputT3OUTA/R1INAInverting Transmitter Output/Inverting Receiver Input
21, 23T_OUTBNoninverting Transmitter Outputs (T2OUTB, T1OUTB)
22, 24T_OUTAInverting Transmitter Outputs (T2OUTA, T1OUTA)C1-Negative Terminal of the Voltage-Doubler Charge-Pump Capacitor. Connect C1+ to C1- with
a 1µF ceramic capacitor.GNDGroundVCC+3.3V Supply Voltage (±5%). Bypass VCC to ground with a 3.3µF ceramic capacitor.C1+Positive Terminal of the Voltage-Doubler Charge-Pump Capacitor. Connect C1+ to C1- with a
1µF ceramic capacitor.
Figure 3. V.10/V.28 Driver Test CircuitCL
Figure 4. V.10/V.28 Receiver Test Circuit
Test Circuits (continued)

50pFRx
MAX3171/MAX3173
+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceivers
Detailed Description

The MAX3171/MAX3173 are three-driver/three-receiver
multiprotocol transceivers that operate from a single
+3.3V supply. The MAX3171/MAX3173, along with the
MAX3170 and MAX3172/MAX3174, form a complete
software-selectable DTE or DCE interface port that sup-
ports the V.28 (RS-232), V.10/V.11 (RS-449, V.36, EIA-
530, EIA-530-A, X.21, RS-423), and V.35 protocols. The
MAX3171/MAX3173 carry the control signals, while the
MAX3170 transceiver carries the high-speed clock and
data signals. The MAX3172/MAX3174 provide termina-
tion for the clock and data signals and have an extra
transceiver for applications requiring four transceivers
The MAX3171/MAX3173 feature a 2mA no-cable mode,
true fail-safe operation, and thermal shutdown circuitry.
Thermal shutdown protects the drivers against exces-
sive power dissipation. When activated, the thermal
shutdown circuitry places the driver outputs into a high-
impedance state.
Mode Selection

The state of mode select pins M0, M1, and M2 determines
which serial interface protocol is selected (Table 1). The
state of the DCE/DTEinput determines whether the trans-
ceivers will be configured as a DTEserial port or a DCE
serial port. When the DCE/DTEinput is logic HIGH, dri-
ver T3 is activated and receiver R1 is disabled. When
the DCE/DTEinput is logic LOW, driver T3 is disabled
and receiver R1 is activated. M0, M1, M2, and
DCE/DTEare internally pulled up to VCCto ensure logic
HIGH if left unconnected.
The MAX3171/MAX3173’s mode can be selected
through software control of the M0, M1, M2, and
DCE/DTEinputs. Alternatively, the mode can be select-
ed by shorting the appropriate combination of mode
control inputs to GND (the inputs left floating will be
internally pulled up to VCC). If the M0, M1, and M2
mode inputs are all unconnected, the MAX3171/
MAX3173 will enter no-cable mode.
Table 1. Mode Selection
LOGIC INPUTSTRANSMITTERSRECEIVERS PROTOCOLM1M0DCE/DTET1T2T3R1R2R3

V.110000V.11V.11ZV.11V.11V.11
RS-530A0010V.11V.10ZV.11V.10V.11
RS-5300100V.11V.11ZV.11V.11V.11
X.210110V.11V.11ZV.11V.11V.11
V.351000V.28V.28ZV.28V.28V.28
RS-449/V.361010V.11V.11ZV.11V.11V.11
V.28/RS-2321100V.28V.28ZV.28V.28V.28
No cable1110ZZZZZZ
V.110001V.11V.11V.11ZV.11V.11
RS-530A0011V.11V.10V.11ZV.10V.11
RS-5300101V.11V.11V.11ZV.11V.11
X.210111V.11V.11V.11ZV.11V.11
V.351001V.28V.28V.28ZV.28V.28
RS-449/V.361011V.11V.11V.11ZV.11V.11
V.28/RS-2321101V.28V.28V.28ZV.28V.28
No cable1111ZZZZZZVCC
GND
C1+
MAX3171
MAX3173
C1-
C2-
C2+C2
1μF
3.3μF
1μF
3.3μF
3.3μF
Figure 5. Charge-Pump Connections
Z = High impedance
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