MAX3172CAI ,#.3V Multiprotocol Software-Selectable Cable Terminators and TransceiversApplicationsData Networking PCI CardsPin Configuration appears at end of data sheet.CSU and DSU Tel ..
MAX3172CAI+ ,+3.3V Multiprotocol Software-Selectable Cable Terminators and TransceiversFeaturesThe MAX3172/MAX3174 contain five software-selec-♦ Industry’s First +3.3V Multiprotocol Term ..
MAX3172EAI+T ,+3.3V Multiprotocol Software-Selectable Cable Terminators and TransceiversApplicationsData Networking PCI CardsPin Configuration appears at end of data sheet.CSU and DSU Tel ..
MAX3173CAI ,+3.3V Multiprotocol 3Tx/3Rx Software-Selectable Control Transceiversapplications that do not require deglitching on MAX3173 CAI 0°C to +70°C 28 SSOP the serial handsha ..
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 ..
MAX639CSA+ ,5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC ConvertersELECTRICAL CHARACTERISTICS(V+ = 9V for the MAX639, V+ = 5V for the MAX640/MAX653, I = 0mA, T = T to ..
MAX639CSA+ ,5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC ConvertersGeneral Description ________
MAX639ESA ,5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Converters
MAX639ESA+ ,5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC ConvertersMAX639/MAX640/MAX65319-4505; Rev 3; 8/975V/3.3V/3V/Adjustable, High-Efficiency, Low I , Step-Down D ..
MAX639ESA+T ,5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC ConvertersELECTRICAL CHARACTERISTICS(V+ = 9V for the MAX639, V+ = 5V for the MAX640/MAX653, I = 0mA, T = T to ..
MAX639ESA+T ,5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC ConvertersFeaturesThe MAX639/MAX640/MAX653 step-down switching' High Efficiency for a Wide Range of Load Curr ..
MAX3172CAI-MAX3174CAI
#.3V Multiprotocol Software-Selectable Cable Terminators and Transceivers
General DescriptionThe MAX3172/MAX3174 contain five software-selec-
table multiprotocol cable termination networks. Each
network is capable of terminating V.11 (RS-422, RS-
530, RS-530A, RS-449, V.36, and X.21) with a 100Ωdif-
ferential load, V.35 with a T-network load, or V.28
(RS-232) and V.10 (RS-423) with an open circuit load
for use with transceivers having on-chip termination.
The devices replace discrete resistor termination net-
works and expensive relays required for multiprotocol
termination. The MAX3172/MAX3174, along with the
MAX3170 and MAX3171/MAX3173, form a complete
+3.3V software-selectable DTE or DCE interface port
supporting V.11/RS-422, RS-530, RS-530A, V.36/RS-
449, V.35, V.28/RS-232, V.10/RS-423, and X.21 serial
interfaces.
In addition to the five multiprotocol cable termination
networks, the MAX3172/MAX3174 contain a 1Tx/1Rx
multiprotocol transceiver designed to use V+ and V-
generated by the MAX3171/MAX3173 charge pump.
The MAX3172/MAX3174 transceiver is software selec-
table between V.10 and V.28 modes of operation. The
MAX3172 features 10µs deglitching on the V.10/V.28
receiver input to facilitate unterminated operation, while
the MAX3174 is used in applications that do not require
deglitching on the serial handshake signals. These
devices are available in a 28-pin SSOP package.
________________________ApplicationsData NetworkingPCI Cards
CSU and DSUTelecommunications
Data Routers
FeaturesIndustry’s First +3.3V Multiprotocol Termination
Networks and TransceiversCertified TBR-1 and TBR-2 Compliant
(NET1 and NET2)Support V.28 (RS-232), V.11 (RS-422, RS-530, RS-
530A, RS-449, V.36, and X.21), V.10 and V.353V/5V Logic-Compatible I/OSoftware-Selectable DTE/DCEReplace Discrete Resistor Termination Networks
and Expensive Relays10µs Receiver Input Deglitching (MAX3172 only)Available in Small 28-Pin SSOP PackageTransmitter Output Fault Protected to ±15V,
Tolerates Cable Miswiring
MAX3172/MAX3174
+3.3V Multiprotocol Software-Selectable
Cable Terminators and Transceivers19-1801; Rev 1; 1/01
Ordering Information
Typical Operating Circuit
Pin Configuration appears at end of data sheet.
MAX3172/MAX3174
+3.3V Multiprotocol Software-Selectable
Cable Terminators and Transceivers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= +3.3V ±5%, TA= TMINto TMAX. Typical values are at VCC= +3.3V, TA= +25°C, unless otherwise noted. See Note 2 for V+
and V- input voltage conditions.)
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,INVERT, T4IN................-0.3V to +6V
Logic Output Voltages
R4OUT...................................................-0.3V to (VCC+ 0.3V)
Short-Circuit Duration............................................Continuous
Transmitter Outputs
T4OUT................................................................-15V to +15V
Short-Circuit Duration........................................................60s
Receiver Input
R4INA.................................................................-15V to +15V
Termination Network Inputs (applied individually)
R_A, R_B............................................................-15V to +15V
Continuous Power Dissipation (TA= +70°C)
28-Pin SSOP (derate 9.52mW/°C above +70°C)........762mW
Operating Temperature Range
MAX3172CAI/MAX3174CAI...............................0°C to +70°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX3172/MAX3174
+3.3V Multiprotocol Software-Selectable
Cable Terminators and Transceivers
ELECTRICAL CHARACTERISTICS (continued)(VCC= +3.3V ±5%, TA= TMINto TMAX. Typical values are at VCC= +3.3V, TA= +25°C, unless otherwise noted. See Note 2 for V+
MAX3172/MAX3174
+3.3V Multiprotocol Software-Selectable
Cable Terminators and Transceivers
ELECTRICAL CHARACTERISTICS (continued)(VCC= +3.3V ±5%, TA= TMINto TMAX. Typical values are at VCC= +3.3V, TA= +25°C, unless otherwise noted. See Note 2 for V+
and V- input voltage conditions.)
Note 2:The charge pump on the MAX3171/MAX3173 can supply V+ and V- to the MAX3172/MAX3174. The V+ and V- input levels
vary with the mode of chipset operation as follows:
V.35/V.28 modes: +5.55V ≤V+ ≤+6.50V, -6.50V ≤V- ≤-5.45V
Typical operation: V+ = +5.90V, V- = -5.80V
V.10/V.11 modes: +4.20V ≤V+ ≤+5.0V, -4.60V ≤V- ≤-3.80V
Typical operation: V+ = +4.60V, V- = -4.20V
The MAX3171/MAX3173 are guaranteed to provide these V+/V- supply levels.
MAX3172/MAX3174
+3.3V Multiprotocol Software-Selectable
Cable Terminators and Transceivers
V.28 SLEW RATE
vs. LOAD CAPACITANCEMAX3172-01
LOAD CAPACITANCE (pF)
SLEW RATE (V/500100015003000
V.28 60kbps TRANSMITTER
WAVEFORM (3kΩ/1000pF LOAD)
MAX3172-02
10µs/div
T4IN
5V/div
T4OUT
5V/div
-5V
V.10 RISE AND FALL TIMES
vs. LOAD CAPACITANCE
MAX3172-03
LOAD CAPACITANCE (pF)
RISE AND FALL TIMES (
Typical Operating Characteristics(VCC = +3.3V (see Note 2 in Electrical Characteristicstable), TA= +25°C, unless otherwise noted.)
MAX3172/MAX3174
+3.3V Multiprotocol Software-Selectable
Cable Terminators and TransceiversV.35 COMMON-MODE IMPEDANCE
vs. TEMPERATURE
MAX3172-09
TEMPERATURE (°C)
COMMON-MODE IMPEDANCE (
V.35 COMMON-MODE
IMPEDANCE vs. V+
MAX3172-11
V+ (V)
COMMON-MODE IMPEDANCE (
V.35 COMMON-MODE
IMPEDANCE vs. V-
MAX3172-12
V- (V)
COMMON-MODE IMPEDANCE (
V.35 COMMON-MODE IMPEDANCE
vs. COMMON-MODE VOLTAGE
MAX3172-10
COMMON-MODE VOLTAGE (V)
COMMON-MODE IMPEDANCE (
V.11/V.35 DIFFERENTIAL-MODE
IMPEDANCE vs. V+
MAX3172-07
V+ (V)
DIFFERENTIAL-MODE IMPEDANCE (
V.11/V.35 DIFFERENTIAL-MODE
IMPEDANCE vs. V-
MAX3172-08
V- (V)
DIFFERENTIAL-MODE IMPEDANCE (
ypical Operating Characteristics (continued)(VCC = +3.3V (see Note 2 in Electrical Characteristicstable), TA= +25°C, unless otherwise noted.)
MAX3172/MAX3174
+3.3V Multiprotocol Software-Selectable
Cable Terminators and TransceiversFigure 1. V.11 or V.35 Differential Impedance MeasurementFigure 2. V.35 Common-Mode Impedance Measurement
Figure 3. V.10/V.28 Driver Test Circuit
Figure 4. V.10/V.28 Receiver Test Circuit
Test Circuits
MAX3172/MAX3174
+3.3V Multiprotocol Software-Selectable
Cable Terminators and Transceivers
Pin Description
MAX3172/MAX3174
+3.3V Multiprotocol Software-Selectable
Cable Terminators and Transceivers
Detailed DescriptionThe MAX3172/MAX3174 contain five software-selectable
multiprotocol cable termination networks. Each network is
capable of terminating V.11 transceivers (RS-422, RS-
530, RS-530A, RS-449, V.36, and X.21) with a 100Ωdif-
ferential load, V.35 transceivers with a T-network load, or
V.28 (RS-232) and V.10 transceivers (RS-423) with an
open circuit load. The MAX3172/MAX3174, along with the
MAX3170 and MAX3171/MAX3173, form a complete
+3.3V software-selectable DTE or DCE interface port sup-
porting V.11/RS-422, RS-530, RS-530A, V.36/RS-449,
V.35, V.28/RS-232, V.10/RS-423, and X.21 serial inter-
faces.
The MAX3172/MAX3174 also contain a multiprotocol
transceiver that is software-selectable between V.10 and
V.28 operation modes. This transceiver is intended as the
handshake signal I/O in a DCE/DTE port application, and
is designed to use V+ and V- levels generated by the
MAX3171/MAX3173 charge pump. The MAX3172 fea-
tures 10µs deglitching on the V.10/V.28 receiver input to
allow unterminated operation. The MAX3174 is used in
applications that do not require deglitching on the serial
handshake signals.
No-Cable ModeThe MAX3172/MAX3174 enter no-cable mode when the
mode-select inputs are all HIGH (M0 = M1 = M2 = 1). In
this mode, the driver, receiver, and bias circuitry are dis-
abled, and the supply current drops to less than 200µA.
In no-cable mode, all five termination networks are
placed in the V.11 mode of operation (shorting pins R_A
and R_B with a 100Ωresistor). The receiver output enters
a high-impedance state in no-cable mode, allowing this
output line to be shared with other receivers (the receiver
output has an internal pullup resistor to pull the output
HIGH if not driven). Also, in no-cable mode, the transmit-
ter output enters a high-impedance state so that this out-
put can be shared with other devices.
Cable TerminationThe MAX3172/MAX3174 software-selectable resistor net-
works are intended for use with the MAX3170 clock/data
transceiver chip. The termination network is used for the
V.11, V.35, and V.28 transmitters. The MAX3172/
MAX3174 provide the advantage of not having to build
expensive termination networks from resistors and relays,
manually changing termination modules, or building ter-
mination networks into custom cables.
Each termination network can be in one of three modes:
V.35, V.11, or high impedance (high-Z) as shown in
Figure 5 (see Table 2). For example, in V.35 mode, all five
MAX3172/MAX3174
+3.3V Multiprotocol Software-Selectable
Cable Terminators and Transceiversnetworks are configured to provide 100Ωdifferential
impedance and 150Ωcommon-mode impedance to ter-
minate the MAX3170 V.35 transmitter outputs and receiv-
er inputs.
Termination Mode SelectionThe mode-select pins M0, M1, M2, and DCE/DTEcontrol
the state of the five termination networks (Table 1). The
mode-select table of the MAX3172/MAX3174 is compati-
ble with the MAX3170 mode-select table so that the M0,
M1, M2, and DCE/DTEpins can be connected to the cor-
responding pins on the MAX3170. For example, M2 = 1,
M1 = 0, M0 = 0 corresponds to V.35 mode for both the
MAX3172/MAX3174 and the MAX3170 clock/data trans-
ceiver chip.
R4/T4 Mode SelectionThe MAX3172/MAX3174 include a transceiver for use in
applications requiring an extra serial handshake signal
(for example, local loopback). The transceiver can be
