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MXL1344ACAG+T
+5V Multiprotocol, Software-Selectable Cable Terminator
ypical Operating CircuitGeneral 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 InformationPART TEMP. RANGE PIN-PACKAGEMXL1344ACAG0°C to +70°C24 SSOPD2D3D4R1R2R3
MXL1543
RXDRXCTXDTXCSCTED2D3R1R2R3
MXL1544/
MAX3175
CTSDSRRTSDTRDCD
RXC B
RXD A (104)
RXD B
SG (102)
SHIELD (101)
RTS A (105)
RTS B
DTR A (108)
DTR B
DCD A (107)
DCD B
DSR A (109)CTS A (106)
DSR B
CTS B
LL A (141)
TXD B
SCTE A (113)
SCTE B
TXC A (114)
TXC B
TXD A (103)
DB-25 CONNECTOR
RXC A (115)510822623201941716391712151124142
MXL1344A
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,
unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSDC CHARACTERISTICS VCC Supply Current ICC All logic inputs = GND or VCC 0.4 1.0 mA
TERMINATOR PINS Differential-Mode Impedance
V.35 Mode -2V ≤ VCM ≤ +2V, all loads, Figure 1 90 104 110 ΩCommon-Mode Impedance
V.35 Mode -2V ≤ VCM ≤ +2V, all loads, Figure 2 135 153 165 ΩVCM = 0V, all loads 100 104 110 Differential-Mode Impedance
V.11 Mode -7V ≤ VCM ≤ +7V, all loads, TA = +25°C 100 104 ΩHigh-Impedance Leakage
Current IZ -7V ≤ VCM ≤+7V, all loads -50 50 µA
LOGIC INPUTS (M0, M1, M2, LATCH, DCE/DTE) Input High Voltage VIH 2.0 VInput Low Voltage VIL 0.8 VLogic Input Current IIH, IIL VIN = VCC or GND ±10 µA
MXL1344A
+5V Multiprotocol, Software-Selectable
Cable TerminatorV.11 OR V.35 DIFFERENTIAL-MODE
IMPEDANCE vs. TEMPERATURE
MXL1344A toc01
TEMPERATURE (°C)
IMPEDANCE (
VCM = +7V
VCM = -7V
VCM = 0
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
MXL1344A toc05
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. TEMPERATUREMXL1344A toc09
SUPPLY CURRENT (
IEE
ICC
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
PINNAMEFUNCTIONM0Mode-Select Pin (Table 1)
2VEENegative Supply Voltage (typically connected to VEE of MXL1543*). Bypass to GND with a 0.1μF
capacitor.R1CLoad 1, Center TapR1BLoad 1, Node BR1ALoad 1, Node AR2ALoad 2, Node AR2BLoad 2, Node BR2CLoad 2, Center TapR3ALoad 3, Node AR3BLoad 3, Node BR3CLoad 3, Center Tap
12, 13GNDGroundVCC+5V Supply Voltage. Bypass to GND with a 0.1μF capacitor.R4BLoad 4, Node BR4ALoad 4, Node AR5BLoad 5, Node BR5ALoad 5, Node AR6ALoad 6, Node AR6BLoad 6, Node BLATCHLatch Signal Input. When LATCH is LOW, the input latches are transparent. When LATCH is high, the
data at the mode-select inputs are latched.DCE/ DTELogic Level HIGH selects DCE interface, (Table 1)M2Mode-Select Pin (Table 1)M1Mode-Select Pin (Table 1)
*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 TerminatorVCM = ±7V OR ±2V
VDM = ±2V
RDM = VDM
R2 = 52Ω
R3 = 127Ω
R1 = 52Ω
S1 ON
S2 OFF
AMMETER
VCM = ±2V
R2 = 52Ω
R3 = 127Ω
R1 = 52Ω
S1 ON
S2 ON
AMMETER
RCM = VCM
Figure 1. V.11 or V.35 Differential Impedance Measurement
Figure 3. Block Diagram
Figure 2. V.35 Common-Mode Impedance Measurement123456267910161518171419208111213
VCCVEE
DCE/DTE
LATCH
MXL1344A
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
Table 1. Termination Mode Select Table
PROTOCOLDCE/ DTEM2M1M0R1R2R3R4R5R6V.10/RS-4230000ZZZZZZ
RS-530A0001ZZZV.11V.11V.11
RS-5300010ZZZV.11V.11V.11
X.210011ZZZV.11V.11V.11
V.350100V.35V.35ZV.35V.35V.35
RS-449/V.360101ZZZV.11V.11V.11
V.28/RS-2320110ZZZZZZ
No Cable0111V.11V.11V.11V.11V.11V.11
V.10/RS-4231000ZZZZZZ
RS-530A1001ZZZZV.11V.11
RS-5301010ZZZZV.11V.11
X.211011ZZZZV.11V.11
V.351100V.35V.35V.35ZV.35V.35
RS-449/V.361101ZZZZV.11V.11
V.28/RS-2321110ZZZZZZ
No Cable1111V.11V.11V.11V.11V.11V.11
Note:Z Indicates high impedance, 1 = high and 0 = low. Z, V.11, and V.35 refer to termination modes (Figure 4.)
52Ω
127Ω
52Ω
CLOSED
OPEN
(a) V.11(b) V.35(c) ZMXL1344A
52Ω
127Ω
52Ω
CLOSED
CLOSED
52Ω
127Ω
52Ω
OPEN
OPEN
MXL1344AMXL1344A
Figure 4. Termination Modes
