參數資料
型號： MAX3171CAI
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 通用總線功能
英文描述： 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors
中文描述： TRIPLE LINE TRANSCEIVER, PDSO28
封裝： 5.30 MM, 0.65 MM PITCH, SSOP-28
文件頁數： 8/15頁
文件大小： 271K
代理商： MAX3171CAI
M
+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceivers
8
_______________________________________________________________________________________
Detailed Description
The MAX3171/MAX3173 are three-driver/three-receiver
multiprotocol transceivers that operate from a single
+3.3V supply. The MAX3171/MAX3173, along with the
MAX3170 and MAX3172/MAX3174, form a complete
software-selectable DTE or DCE interface port that sup-
ports the V.28 (RS-232), V.10/V.11 (RS-449, V.36, EIA-
530, EIA-530-A, X.21, RS-423), and V.35 protocols. The
MAX3171/MAX3173 carry the control signals, while the
MAX3170 transceiver carries the high-speed clock and
data signals. The MAX3172/MAX3174 provide termina-
tion for the clock and data signals and have an extra
transceiver for applications requiring four transceivers
for control handshaking.
The MAX3171/MAX3173 feature a 2mA no-cable mode,
true fail-safe operation, and thermal shutdown circuitry.
Thermal shutdown protects the drivers against exces-
sive power dissipation. When activated, the thermal
shutdown circuitry places the driver outputs into a high-
impedance state.
Mode Selection
The state of 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 trans-
ceivers will be configured as a
DTE
serial port or a DCE
serial port. When the DCE/
DTE
input is logic HIGH, dri-
ver T3 is activated and receiver R1 is disabled. When
the DCE/
DTE
input is logic LOW, driver T3 is disabled
and receiver R1 is activated. M0, M1, M2, and
DCE/
DTE
are internally pulled up to V
CC
to ensure logic
HIGH if left unconnected.
The MAX3171/MAX3173
’
s mode can be selected
through software control of the M0, M1, M2, and
DCE/
DTE
inputs. Alternatively, the mode can be select-
ed by shorting the appropriate combination of mode
control inputs to GND (the inputs left floating will be
internally pulled up to V
CC
). If the M0, M1, and M2
mode inputs are all unconnected, the MAX3171/
MAX3173 will enter no-cable mode.
Table 1. Mode Selection
LOGIC INPUTS
M1
M0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
TRANSMITTERS
T2
V.11
V.11
V.11
V.10
V.11
V.11
V.11
V.11
V.28
V.28
V.11
V.11
V.28
V.28
Z
V.11
V.11
V.11
V.10
V.11
V.11
V.11
V.11
V.28
V.28
V.11
V.11
V.28
V.28
Z
RECEIVERS
R2
V.11
V.10
V.11
V.11
V.28
V.11
V.28
Z
V.11
V.10
V.11
V.11
V.28
V.11
V.28
Z
PROTOCOL
M2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
DCE/
DTE
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
T1
T3
Z
Z
Z
Z
Z
Z
Z
Z
V.11
V.11
V.11
V.11
V.28
V.11
V.28
Z
R1
V.11
V.11
V.11
V.11
V.28
V.11
V.28
Z
Z
Z
Z
Z
Z
Z
Z
Z
R3
V.11
V.11
V.11
V.11
V.28
V.11
V.28
Z
V.11
V.11
V.11
V.11
V.28
V.11
V.28
Z
V.11
RS-530A
RS-530
X.21
V.35
RS-449/V.36
V.28/RS-232
No cable
V.11
RS-530A
RS-530
X.21
V.35
RS-449/V.36
V.28/RS-232
No cable
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Z
Z
1
2
28
27
V
CC
GND
C1+
3
4
26
25
MAX3171
MAX3173
C1-
C2-
V-
V+
C2+
C2
1
μ
F
C5
3.3
μ
F
C1
1
μ
F
C3
3.3
μ
F
C4
3.3
μ
F
Figure 5. Charge-Pump Connections
Z = High impedance
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