MAX3172 Просмотр технического описания (PDF) - Maxim Integrated
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MAX3172 Datasheet PDF : 19 Pages
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+3.3V Multiprotocol Software-Selectable
Cable Terminators and Transceivers
Table 3. R4/T4 Mode-Select Table
PROTOCOL
Not Used (Default V.11)
RS-530A
RS-530
X.21
V.35
RS-449/V.36
V.28/RS-232
No Cable
Not Used (Default V.11)
RS-530A
RS-530
X.21
V.35
RS-449/V.36
V.28/RS-232
No Cable
Not Used (Default V.11)
RS-530A
RS-530
X.21
V.35
RS-449/V.36
V.28/RS-232
No Cable
Not Used (Default V.11)
RS-530A
RS-530
X.21
V.35
RS-449/V.36
V.28/RS-232
No Cable
M2
M1
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
M0
DCE/DTE
INVERT
T4
0
0
0
Z
1
0
0
Z
0
0
0
Z
1
0
0
Z
0
0
0
Z
1
0
0
Z
0
0
0
Z
1
0
0
Z
0
1
0
V.10
1
1
0
V.10
0
1
0
V.10
1
1
0
V.10
0
1
0
V.28
1
1
0
V.10
0
1
0
V.28
1
1
0
Z
0
0
1
V.10
1
0
1
V.10
0
0
1
V.10
1
0
1
V.10
0
0
1
V.28
1
0
1
V.10
0
0
1
V.28
1
0
1
Z
0
1
1
Z
1
1
1
Z
0
1
1
Z
1
1
1
Z
0
1
1
Z
1
1
1
Z
0
1
1
Z
1
1
1
Z
R4
V.10
V.10
V.10
V.10
V.28
V.10
V.28
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
V.10
V.10
V.10
V.10
V.28
V.10
V.28
Z
networks are configured to provide 100Ω differential
impedance and 150Ω common-mode impedance to ter-
minate the MAX3170 V.35 transmitter outputs and receiv-
er inputs.
Termination Mode Selection
The mode-select pins M0, M1, M2, and DCE/DTE control
the state of the five termination networks (Table 1). The
mode-select table of the MAX3172/MAX3174 is compati-
ble with the MAX3170 mode-select table so that the M0,
M1, M2, and DCE/DTE pins can be connected to the cor-
responding pins on the MAX3170. For example, M2 = 1,
M1 = 0, M0 = 0 corresponds to V.35 mode for both the
MAX3172/MAX3174 and the MAX3170 clock/data trans-
ceiver chip.
R4/T4 Mode Selection
The MAX3172/MAX3174 include a transceiver for use in
applications requiring an extra serial handshake signal
(for example, local loopback). The transceiver can be
10 ______________________________________________________________________________________
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