MXL1543 데이터 시트보기 (PDF) - Maxim Integrated
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MXL1543 Datasheet PDF : 18 Pages
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+5V Multiprotocol, 3Tx/3Rx, Software-
Selectable Clock/Data Transceivers
Pin Description
PIN
NAME
FUNCTION
1
C1-
Capacitor C1 Negative Terminal. Connect a 1µF ceramic capacitor between C1+ and C1-.
2
C1+
Capacitor C1 Positive Terminal. Connect a 1µF ceramic capacitor between C1+ and C1-.
3
VDD
Generated Positive Supply. Connect a 4.7µF ceramic capacitor to ground.
4
VCC
+5V Supply Voltage (±5%). Decouple with a 1µF capacitor to ground.
5
T1IN
Transmitter 1 TTL-Compatible Input
6
T2IN
Transmitter 2 TTL-Compatible Input
7
T3IN
Transmitter 3 TTL-Compatible Input
8
R1OUT
Receiver 1 CMOS Output
9
R2OUT
Receiver 2 CMOS Output
10
R3OUT
Receiver 3 CMOS Output
11
M0
Mode-Select Pin with Internal Pullup to VCC
12
M1
Mode-Select Pin with Internal Pullup to VCC
13
M2
Mode-Select Pin with Internal Pullup to VCC
14
DCE/DTE
DCE/DTE Mode-Select Pin with Internal Pullup to VCC
15
R3INB
Noninverting Receiver Input
16
R3INA
Inverting Receiver Input
17
R2INB
Noninverting Receiver Input
18
R2INA
Inverting Receiver Input
19
T3OUTB/R1INB Noninverting Transmitter Output/Noninverting Receiver Input
20
T3OUTA/R1INA Inverting Transmitter Output/Inverting Receiver Input
21
T2OUTB
Noninverting Transmitter Output
22
T2OUTA
Inverting Transmitter Output
23
T1OUTB
Noninverting Transmitter Output
24
T1OUTA
Inverting Transmitter Output
25
GND
Ground
26
VEE
Generated Negative Supply. Connect a 4.7µF ceramic capacitor to ground.
27
C2-
Capacitor C2 Negative Terminal. Connect a 1µF ceramic capacitor between C2+ and C2-.
28
C2+
Capacitor C2 Positive Terminal. Connect a 1µF ceramic capacitor between C2+ and C2-.
Detailed Description
The MXL1543 is a three-driver/three-receiver, multipro-
tocol transceiver that operates from a single +5V sup-
ply. The MXL1543, along with the MXL1544/MAX3175
and MXL1344A, form a complete software-selectable
DTE or 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 MXL1543 transceivers
carry the high-speed clock and data signals, while the
MXL1544/MAX3175 transceivers carry serial interface
control signaling. The MXL1543 can be terminated by
the MXL1344A software-selectable resistor termination
network or by a discrete termination network. The
MXL1543 features a 0.5µA no-cable mode, true fail-
safe operation, and thermal shutdown circuitry. Thermal
shutdown protects the drivers against excessive power
dissipation. When activated, the thermal shutdown cir-
cuitry places the driver outputs into a high-impedance
state.
Mode Selection
The state of the mode-select pins M0, M1, and M2
determines which serial interface protocol is selected
(Table 1). The state of the DCE/DTE input determines
whether the transceiver will be configured as a DTE or
DCE serial port. When the DCE/DTE input is logic
HIGH, driver T3 is activated and receiver R1 is dis-
abled. When the DCE/DTE input is logic LOW, driver T3
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