MAX13174E Datasheet, PDF (7/13 Pages) Maxim Integrated Products – +5V Multiprotocol, Pin-Selectable Cable Terminator

+5V Multiprotocol, Pin-Selectable
Cable Terminator
Table 1. Termination Mode Select Table
PROTOCOL
V.10/RS-423
RS-530A
RS-530
X.21
V.35
RS-449/V.36
V.28/RS-232
No Cable
V.10/RS-423
RS-530A
RS-530
X.21
V.35
RS-449/V.36
V.28/RS-232
No Cable
DCE/ DTE M2
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
M1
M0
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
R1
Z
Z
Z
Z
V.35
Z
Z
V.11
Z
Z
Z
Z
V.35
Z
Z
V.11
R2
Z
Z
Z
Z
V.35
Z
Z
V.11
Z
Z
Z
Z
V.35
Z
Z
V.11
R3
Z
Z
Z
Z
Z
Z
Z
V.11
Z
Z
Z
Z
V.35
Z
Z
V.11
R4
Z
V.11
V.11
V.11
V.35
V.11
Z
V.11
Z
Z
Z
Z
Z
Z
Z
V.11
R5
Z
V.11
V.11
V.11
V.35
V.11
Z
V.11
Z
V.11
V.11
V.11
V.35
V.11
Z
V.11
Note: Z indicates high impedance, 1 = high, and 0 = low. Z, V.11, and V.35 refer to termination modes (Figure 4).
R6
Z
V.11
V.11
V.11
V.35
V.11
Z
V.11
Z
V.11
V.11
V.11
V.35
V.11
Z
V.11
A
MAX13174E
R1
52Ω
S1
CLOSED
S2
OPEN
R2
52Ω
R3
127Ω
B
(a) V.11
Figure 4. Termination Modes
A
C
B
MAX13174E
R1
52Ω
S1
CLOSED
S2
CLOSED
R2
52Ω
R3
127Ω
A
C
B
(b) V.35
MAX13174E
R1
52Ω
S1
OPEN
C
S2
OPEN
R2
52Ω
R3
127Ω
(c) Z
forcing them to the logic-high state if they are not
grounded. This allows interface-mode configuration by
simply strapping the appropriate pins to ground in the
interconnect cable.
V.11 Termination
A standard V.11 interface is shown in Figure 6. For high-
speed data transmission, the V.11 specification recom-
mends terminating the cable at the receiver with a 100Ω
(min) resistor. The resistor, although not required, pre-
vents reflections from corrupting transmitted data.
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