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MXL1344ACAG
+5V Multiprotocol, Software-Selectable Cable Terminator
General DescriptionThe MXL1344A contains six software-selectable, multi-
protocol 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 100Ωdifferential 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 trans-
ceivers having on-chip termination. The termination pro-
tocol can be selected by the serial interface cable
wiring or by software control. The MXL1344A replaces
discrete resistor termination networks and expensive
relays required for multiprotocol termination, saving
space and cost.
The MXL1344A terminator is designed to form a com-
plete +5V cable- or software-selectable multiprotocol
DCE/DTE interface port when used with the MXL1543
and MXL1544/MAX3175 transceiver ICs. TheMXL1344A
terminator can use the VEEpower generated by the
MXL1543 charge pump, simplifying system design. The
MXL1344A, MXL1543, and MXL1544/MAX3175 are pin-
for-pin compatible with the LTC1344A, LTC1543, and
LTC1544, but for proper operation the entire Maxim
chipset must be used without substituting other manu-
facturer's parts on a chip-by-chip basis.
The MXL1344A is available in a 24-pin SSOP package
and is specified for the 0°C to +70°C commercial tem-
perature range.
FeaturesCertified TBR-1 and TBR-2-Compliant Chipset
(NET1 and NET2)—Pending Completion of
TestingSupports V.10 (RS-423), V.11 (RS-422, RS-530,
RS-530A, RS-449, V.36, and X.21), V.28 (RS-232)
and V.35 TerminationCable- or Software-Selectable TerminationCable- or Software-Selectable DTE/DCEReplaces Discrete Resistor Termination Networks
and Expensive RelaysAvailable in Small 24-Pin SSOP Package
ApplicationsData NetworkingPCI Cards
CSU and DSUTelecommunication Equipment
Data RoutersData Switches
MXL1344A
+5V Multiprotocol, Software-Selectable
Cable Terminator19-1775; Rev 0; 2/01
Ordering Information
Pin Configuration appears at end of data sheet.
MXL1344A
+5V Multiprotocol, Software-Selectable
Cable Terminator
ABSOLUTE MAXIMUM RATINGSStresses 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.
All Voltages to GND Unless Otherwise Noted
Supply Voltages
VCC........................................................................-0.3V to +6V
VEE.........................................................................+0.3V to -7V
Logic Input Voltages
M0, M1, M2, DCE/DTE, LATCH.............................-0.3V to +6V
Termination Network Inputs
R_A, R_B..............................................................-15V to +15V
R_A to R_B........................................................................±15V
Continuous Power Dissipation (TA= +70°C)
24-Pin SSOP (derate 8mW/°C above +70°C)...............640mW
Operating Temperature Range...............................0°C to +70°C
Die Temperature..............................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
ELECTRICAL CHARACTERISTICS(VCC= +5V ±5%, VEE= -5V ±5%, TA= 0°C to 70°C, unless otherwise noted. Typical values are at TA= +25°C, VCC= +5V, VEE= -5V,
MXL1344A
+5V Multiprotocol, Software-Selectable
Cable TerminatorV.11 OR V.35 DIFFERENTIAL-MODE
IMPEDANCE vs. TEMPERATURE
MXL1344A toc01
TEMPERATURE (°C)
IMPEDANCE (
V.11 OR V.35 DIFFERENTIAL-MODE
IMPEDANCE vs. COMMON MODE VOLTAGE
MXL1344A toc02
VCM (V)
IMPEDANCE (-11-5-3357
V.11 OR V.35 DIFFERENTIAL-MODE
IMPEDANCE vs. SUPPLY VOLTAGE (VCC)
MXL1344A toc03
VCC (V)
IMPEDANCE (
V.11 OR V.35 DIFFERENTIAL-MODE
IMPEDANCE vs. SUPPLY VOLTAGE (VEE)
MXL1344A toc04
VEE (V)
IMPEDANCE (
V.35 COMMON-MODE IMPEDANCE
vs. TEMPERATURE
TEMPERATURE (°C)
IMPEDANCE (
V.35 COMMON-MODE IMPEDANCE
vs. COMMON-MODE VOLTAGE (VCM)
MXL1344A toc06
VCM (V)
IMPEDANCE (
V.35 COMMON-MODE IMPEDANCE
vs. SUPPLY VOLTAGE (VCC)
MXL1344A toc07
VCC (V)
IMPEDANCE (
V.35 COMMON-MODE IMPEDANCE
vs. SUPPLY VOLTAGE (VEE)
MXL1344A toc08
VEE (V)
IMPEDANCE (
SUPPLY CURRENT vs. TEMPERATURESUPPLY CURRENT (
TEMPERATURE (°C)
Typical Operating Characteristics(VCC= +5V, VEE= -5V, TA = +25°C, unless otherwise noted.)
Detailed DescriptionThe MXL1344A contains six software-selectable multi-
protocol cable termination networks (Figure 3). 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 termination protocol can be selected by the serial
interface cable wiring or by software control. The
MXL1344A replaces discrete resistor termination net-
works and expensive relays required for multiprotocol
termination, saving space and cost.
The MXL1344A terminator is designed to form a com-
plete +5V cable- or software-selectable multiprotocol
DTE/DCE interface port when used with the MXL1543
and MXL1544/MAX3175 transceivers. The MXL1344A
terminator can use the VEEpower generated by the
MXL1543 charge pump, simplifying system design. The
MXL1344A, MXL1543, and MXL1544/MAX3175 are pin-
for-pin compatible with the LTC1344A, LTC1543, and
LTC1544, but for proper operation, the entire Maxim
MXL1344A
+5V Multiprotocol, Software-Selectable
Cable Terminator
Pin Description*VEE is typically supplied by the charge pump of the MXL1543. The VEEinput level varies with the mode of chipset operation
as follows:
V.35/V.28 Modes: -6.50V ≤VEE≤-5.45V, in typical operation VEE= -5.80V
V.10/V.11 Modes: -4.60V ≤VEE≤-3.80V, in typical operation VEE= -4.20V
MXL1344A
+5V Multiprotocol, Software-Selectable
Cable TerminatorFigure 1. V.11 or V.35 Differential Impedance Measurement
Figure 3. Block Diagram
Figure 2. V.35 Common-Mode Impedance Measurement
chipset must be used without substituting other manu-
facturer's parts on a chip-by-chip basis.
Termination ModesThe termination networks in the MXL1344A can be set
to one of three modes, V.11, V.35, or high impedance
(high-Z). As shown in Figure 4, in V.11 mode, switch S1
is closed and switch S2 is open, presenting 104Ω
across terminals A and B. In V.35 mode, switches S1
and S2 are both closed, presenting a T-network with
104Ωdifferential impedance and 153Ωcommon-mode
impedance. In high-Z mode, switches S1 and S2 are
both open, presenting a high impedance across termi-
nals A and B suitable for V.28 and V.10 modes.
MXL1344AThe state of the MXL1344A’s mode-select pins, M0,
M1, M2, and DCE/DTEdetermines the mode of each of
the six termination networks. Table 1shows a cross-ref-
erence of termination mode and select pin state for
each of the six termination networks within the
MXL1344A.
+5V Multiprotocol, Software-Selectable
Cable Terminator
Note:Z Indicates high impedance, 1 = high and 0 = low. Z, V.11, and V.35 refer to termination modes (Figure 4.)
Figure 4. Termination Modes
