MAX4670ETJ+T Maxim Integrated Products, MAX4670ETJ+T Datasheet - Page 9

• Manufacturer Part Number: MAX4670ETJ+T
• Description: IC PROT SWITCH T1/E1/J1 32-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX4670ETJ+T

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 32-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 1. Functional Diagram
In a switching-card architecture, a common switching
card contains all the protection switches for the T1/E1/J1
lines entering the system (see Figures 7 and 8).
With an adjacent card architecture, the switches pro-
tecting any given line card reside physically in the adja-
cent line card (see Figures 9 and 10).
Receive and transmit interfaces reside in the same
board for each T1/E1/J1 port. The diagrams represent
_______________________________________________________________________________________
NO1
NC1
NO2
NC2
NO3
NC3
NO4
NC4
NO5
NC5
NO6
NC6
NO7
NC7
NO8
NC8
0.6Ω
0.6Ω
0.6Ω
0.6Ω
0.6Ω
0.6Ω
0.6Ω
0.6Ω
MAX4670
Integrated T1/E1/J1 Short-Haul and
GND
Long-Haul Protection Switch
V+
SWITCH
R
R
T
T
T
T
R
R
X
X
X
X
X
X
X
X
the typical interface transformers and resistors recom-
mended for Dallas/Maxim LIUs, such as the DS21Q55.
The protection switches are placed in the low-voltage
side of the transformer to meet the isolation require-
ments. Note that there is also a TVS in the line side of
the transformers. The receive and transmit resistors pro-
vide impedance matching to the T1/E1/J1 transmission
cable characteristic impedance. Refer to Application
Note 2857 for more information on T1/E1/J1 applications.
COM1
COM2
INA
COM3
COM4
INB
COM5
COM6
INC
COM7
COM8
IND
SWITCH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
LOW
LOW
LOW
LOW
INA
INB
INC
IND
X
X
X
X
NC1/NC2 NO1/NO2
NC3/NC4 NO3/NO4
NC5/NC6 NO5/NO6
NC7/NC8 NO7/NO8
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
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