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19-3444; Rev 0; 10/04
+5V Multiprotocol, 3Tx/3Rx, Software-
Selectable Clock/Data Transceivers
General Description
The MXL1543B is a three-driver/three-receiver multipro-
tocol transceiver that operates from a +5V single sup-
ply. The MXL1543B, along with the MXL1544/MAX3175
and the MXL1344A, form a complete software-selec-
table data terminal equipment (DTE) or data communi-
cation equipment (DCE) interface port that supports the
V.28 (RS-232), V.10/V.11 (RS-449/V.36, EIA-530, EIA-
530A, X.21), and V.35 protocols. The MXL1543B trans-
ceivers carry the high-speed clock and data signals
while the MXL1544/MAX3175 carry the control signals.
The MXL1543B can be terminated by the MXL1344A
software-selectable resistor termination network or by
discrete termination networks.
An internal charge pump and a proprietary low-dropout
transmitter output stage allow V.11- , V.28- , and V.35-
compliant operation from a +5V single 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 0.5µA and all
transmitter and receiver outputs are disabled (high
impedance). Short-circuit current limiting and thermal
shutdown circuitry protect the drivers against excessive
power dissipation.
Features
♦
MXL1543B, MXL1544/MAX3175, and MXL1344A
Chipset Is Pin Compatible with LTC1543,
LTC1544, and LTC1344A
♦
Supports RS-232, RS-449, EIA-530, EIA-530A,
V.35, V.36, and X.21
♦
Software-Selectable Cable Termination Using the
MXL1344A
♦
Complete DTE or DCE Port with MXL1544/
MAX3175, and MXL1344A
♦
+5V Single-Supply Operation
♦
0.5µA No-Cable Mode
♦
TUV-Certified NET1/NET2 and TBR1/TBR2-
Compliant
MXL1543B
Ordering Information
PART
MXL1543BCAI
TEMP RANGE
0° to +70°C
PIN-PACKAGE
28 SSOP
Applications
Data Networking
CSU and DSU
Data Routers
PCI Cards
Telecommunications
Equipment
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
LL
CTS
DSR
DCD
DTR
RTS
RXD
RXC
TXC
SCTE TXD
D4
R4
R3
R2
R1
MXL1544
MAX3175
D3
D2
D1
R3
R2
R1
MXL1543B
D3
D2
D1
MXL1344A
18
LL A (141)
13 5 10 8
CTS A (106)
CTS B
DSR A (109)
DSR B
22 6
DCD A (107)
DCD B
23 20 19 4
DTR A (108)
DTR B
RTS A (105)
RTS B
1
SHIELD (101)
7
SG (102)
16 3
RXD A (104)
RXD B
9 17
RXC A (115)
RXC B
12 15 11 24 14 2
TXC A (114)
TXC B
SCTE A (113)
SCTE B
TXD A (103)
TXD B
DB-25 CONNECTOR
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
+5V Multiprotocol, 3Tx/3Rx, Software-
Selectable Clock/Data Transceivers
MXL1543B
ABSOLUTE MAXIMUM RATINGS
All Voltages Referenced to GND Unless Otherwise Noted.
Supply Voltages
V
CC
.......................................................................-0.3V to +6V
V
DD
....................................................................-0.3V to +7.3V
V
EE
.....................................................................+0.3V to -6.5V
V
DD
to V
EE
(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 (V
CC
+ 0.3V)
Transmitter Outputs
T_OUT_, T3OUT_/R1IN_.....................................-15V to +15V
Short-Circuit Duration............................................Continuous
Note 1:
V
DD
and V
EE
absolute difference cannot exceed 13V.
Receiver Input
R_IN_T3OUT_/R1IN_ ..........................................-15V to +15V
R_IN A to R_IN B..............................-15V to 0V or 0V to +15V
Continuous Power Dissipation (T
A
= +70°C)
28-Pin SSOP (derate 9.5mW/°C above +70°C) ...........762mW
Operating Temperature Range
MXL1543BCAI .....................................................0°C to 70°C
Junction Temperature .......................................................150°C
Storage Temperature Range ...........................-65°C to +150°C
Lead Temperature (soldering, 10s) ...............................+300°C
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.
ELECTRICAL CHARACTERISTICS
(V
CC
= +5.0V, C1 = C2 = C4 = 1µF, C3 = C5 = 4.7µF, (Figure 10), T
A
= T
MIN
to T
MAX
. Typical values are at T
A
= +25°C, unless other-
wise noted.)
PARAMETER
DC CHARACTERISTICS
V
CC
Operating Range
V
CC
RS-530, RS-530A, X.21, no load
Supply Current
(DCE Mode)
(Digital Inputs = GND or
V
CC
)
(Transmitter Outputs Static)
RS-530, RS-530A, X.21, full load
V.35 mode, no load
I
CC
V.35 mode, full load
V.28 mode, no load
V.28 mode, full load
No-cable mode
RS-530, RS-530A, X.21, full load
Internal Power Dissipation
(DCE Mode)
P
D
V.35 mode, full load
V.28 mode, full load
Any mode (except no-cable mode), no load
Positive Charge-Pump
Output Voltage
V
DD
V.28 mode, with load
V.28, V.35 modes, with load, I
DD
= 10mA
V.28, V.35, no load
Negative Charge-Pump
Output Voltage
Supply Rise Time
Input High Voltage
Input Low Voltage
Logic Input Current
V
EE
V.28 mode, full load
V.35 mode, full load
RS-530, RS-530A, X.21, full load
t
r
V
IH
V
IL
T1IN, T2IN, T3IN
I
IN
M0, M1, M2, DCE/DTE = GND
M0, M1, M2, DCE/DTE = V
CC
-100
-50
No-cable mode or power-up to turn on
2.0
0.8
±10
-30
±10
µA
LOGIC INPUTS (M0, M1, M2, DCE/DTE, T1IN, T2IN, T3IN)
V
6.4
6.4
6.4
4.75
13
100
20
126
20
40
0.5
230
600
140
6.8
6.8
6.8
-5.6
-5.6
-5.6
-5.6
500
-5.4
-5.4
-5.4
µs
V
V
mW
75
10
µA
170
130
mA
5.25
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
+5V Multiprotocol, 3Tx/3Rx, Software-
Selectable Clock/Data Transceivers
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +5.0V, C1 = C2 = C4 = 1µF, C3 = C5 = 4.7µF, (Figure 10), T
A
= T
MIN
to T
MAX
. Typical values are at T
A
= +25°C, unless oth-
erwise noted.)
PARAMETER
Output High Voltage
Output Low Voltage
Output Short-Circuit Current
Output Pullup Current
V.11 TRANSMITTER
Open-Circuit Differential Output
Voltage
Loaded Differential Output
Voltage
Change in Magnitude of Output
Differential Voltage
Common-Mode Output Voltage
Change in Magnitude of Output
Common-Mode Voltage
Short-Circuit Current
Output Leakage Current
Rise or Fall Time
Transmitter Input to Output
Delay
Data Skew
Output to Output Skew
V.11 RECEIVER
Differential Threshold Voltage
Input Hysteresis
Receiver Input Current
Receiver Input Resistance
Rise or Fall Time
Receiver Input to Output Delay
Data Skew
V.35 TRANSMITTER
Differential Output Voltage
Output High Current
Output Low Current
V
OD
I
OH
I
OL
Open circuit (Figure 3)
With load, -4V
≤
V
CM
≤
4V (Figure 3)
V
A,B
= 0
V
A,B
= 0
±0.44
-13
9
±0.55
-11
11
±7
±0.66
-9
13
V
mA
mA
V
TH
∆V
TH
I
IN
R
IN
t
r
, t
f
t
PHL
,t
PLH
|tPHL- tPLH|
MXL1543B
SYMBOL
V
OH
V
OL
I
SC
I
L
CONDITIONS
I
SOURCE
= 4mA
I
SINK
= 4mA
0
≤
V
OUT
≤
V
CC
V
OUT
= 0, no-cable mode
MIN
3
TYP
4.5
0.3
70
MAX
UNITS
LOGIC OUTPUTS (R1OUT, R2OUT, R3OUT)
0.8
±50
V
mA
µA
V
ODO
Open circuit, R = 1.95kΩ (Figure 1)
R = 50Ω (Figure 1), T
A
= +25
o
C
R = 50Ω (Figure 1)
0.5
✕
V
ODO
±2
±5
0.67
✕
V
ODO
V
V
ODL
V
∆V
OD
V
OC
∆V
OC
I
SC
I
Z
t
r,
t
f
t
PHL ,
t
PLH
ItPHL- tPLHI
tSKEW
R = 50Ω (Figure 1)
R = 50Ω (Figure 1)
0.2
3.0
V
V
R = 50Ω (Figure 1)
V
OUT
= GND
-0.25V
≤
V
OUT
≤
+0.25V, power-off or
no-cable mode
(Figures 2, 6)
(Figures 2, 6)
(Figures 2, 6)
(Figures 2, 6)
-7V
≤
V
CM
≤
7V
-7V
≤
V
CM
≤
7V
-10V
≤
V
A, B
≤10V
-10V
≤
V
A, B
≤
10V
(Figures 2, 7)
(Figures 2, 7)
(Figures 2, 7)
15
30
15
50
2
-200
15
2
±1
10
40
2
3
0.2
150
±100
25
80
12
V
mA
µA
ns
ns
ns
ns
200
40
±0.66
mV
mV
mA
kΩ
ns
80
16
ns
ns
_______________________________________________________________________________________
3
+5V Multiprotocol, 3Tx/3Rx, Software-
Selectable Clock/Data Transceivers
MXL1543B
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +5.0V, C1 = C2 = C4 = 1µF, C3 = C5 = 4.7µF, (Figure 10), T
A
= T
MIN
to T
MAX
. Typical values are at T
A
= +25°C, unless oth-
erwise noted.)
PARAMETER
Output Leakage Current
Rise or Fall Time
Transmitter Input to Output
Delay
Data Skew
Output-to-Output Skew
V.35 RECEIVER
Differential Input Voltage
Input Hysteresis
Receiver Input Current
Receiver Input Resistance
Rise or Fall Time
Receiver Input to Output Delay
Data Skew
V.28 TRANSMITTER
Output Voltage Swing (Figure 4)
Short-Circuit Current
Output Leakage Current
Output Slew Rate
Transmitter Input to Output
Delay
Transmitter Input to Output
Delay
V.28 RECEIVER
Input Threshold Low
Input Threshold High
Input Hysteresis
Input Resistance
Rise or Fall Time
Receiver Input to Output Delay
Receiver Input to Output Delay
V
IL
V
IH
V
HYST
R
IN
t
r
, t
f
t
PHL
t
PLH
-15V
≤
V
IN
≤
+15V
(Figures 5, 9)
(Figures 5, 9)
(Figures 5, 9)
3
0.8
1.2
1.2
0.05
5
15
60
160
100
250
2.0
0.3
7
V
V
V
kΩ
ns
ns
ns
V
O
I
SC
I
Z
SR
t
PHL
t
PLH
-0.25V
≤
V
OUT
≤
+0.25V, power-off or no-
cable mode
R
L
= 3kΩ, C
L
= 2500pF (Figures 4, 8)
R
L
= 3kΩ, C
L
= 2500pF (Figures 4, 8)
R
L
= 3kΩ, C
L
= 2500pF (Figures 4, 8)
4
1.5
1.5
±1
Open circuit
R
L
= 3kΩ
±5
±6
±150
±100
30
2.5
3
±7
V
mA
µA
V/µs
µs
µs
V
TH
∆V
TH
I
IN
R
IN
t
r
, t
f
tPHL, tPLH
|tPHL–tPLH|
SYMBOL
I
Z
t
r
, t
f
t
PHL
,
t
PLH
|tPHL–tPLH|
CONDITIONS
-0.25V
≤
V
OUT
≤
+0.25V, power-off or no-
cable mode
(Figures 3, 6)
(Figures 3, 6)
(Figures 3, 6)
(Figures 3, 6)
-2V
≤
V
CM
≤
2V (Figure 3)
-2V
≤
V
CM
≤
2V (Figure 3)
-10V
≤
V
A
,
B
≤
10V
-10V
≤
V
A
,
B
≤
10V
(Figures 3, 7)
(Figures 3, 7)
(Figures 3, 7)
MIN
TYP
±1
5
35
2
4
MAX
±100
UNITS
µA
ns
80
16
ns
ns
ns
t
SKEW
-200
15
15
30
15
50
2
200
40
±0.66
mV
mV
mA
kΩ
ns
80
16
ns
ns
4
_______________________________________________________________________________________
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