MXL1344A Datasheet, PDF (6/12 Pages) Maxim Integrated Products – +5V Multiprotocol, Software-Selectable Cable Terminator

+5V Multiprotocol, Software-Selectable
Cable Terminator
A
MXL1344A
R1
52Ω
S1
CLOSED
S2
OPEN
R2
52Ω
R3
127Ω
B
(a) V.11
Figure 4. Termination Modes
A
C
B
A
MXL1344A
R1
52Ω
S1
CLOSED
C
S2
CLOSED
R2
52Ω
R3
127Ω
B
(b) V.35
MXL1344A
R1
52Ω
S1
OPEN
C
S2
OPEN
R2
52Ω
R3
127Ω
(c) Z
Table 1. Termination Mode Select Table
PROTOCOL
DCE/ DTE M2
M1
M0
R1
R2
R3
R4
R5
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
0
0
0
0
Z
Z
Z
Z
Z
0
0
0
1
Z
Z
Z
V.11
V.11
0
0
1
0
Z
Z
Z
V.11
V.11
0
0
1
1
Z
Z
Z
V.11
V.11
0
1
0
0
V.35
V.35
Z
V.35
V.35
0
1
0
1
Z
Z
Z
V.11
V.11
0
1
1
0
Z
Z
Z
Z
Z
0
1
1
1
V.11
V.11
V.11
V.11
V.11
1
0
0
0
Z
Z
Z
Z
Z
1
0
0
1
Z
Z
Z
Z
V.11
1
0
1
0
Z
Z
Z
Z
V.11
1
0
1
1
Z
Z
Z
Z
V.11
1
1
0
0
V.35
V.35
V.35
Z
V.35
1
1
0
1
Z
Z
Z
Z
V.11
1
1
1
0
Z
Z
Z
Z
Z
1
1
1
1
V.11
V.11
V.11
V.11
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
The state of the MXL1344A’s mode-select pins, M0,
M1, M2, and DCE/DTE determines the mode of each of
the six termination networks. Table 1 shows a cross-ref-
erence of termination mode and select pin state for
each of the six termination networks within the
MXL1344A.
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