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TP3404V bảng dữ liệu(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện TP3404V
Giải thích chi tiết về linh kiện  Quad Digital Adapter for Subscriber Loops (QDASL)
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TP3404V bảng dữ liệu(HTML) 10 Page - National Semiconductor (TI)

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Functional Description (Continued)
TABLE VI Status Register Functions
Byte 2
Indication
76543210
0
0
Line 3 deactivated
0
1
Line 3 line signal present but not in sync
1
0
Line 3 activated bipolar violation (Note 1)
1
1
Line 3 activated no bipolar violation
0
0
Line 2 deactivated
0
1
Line 2 line signal present but not in sync
1
0
Line 2 activated bipolar violation (Note 1)
1
1
Line 2 activated no bipolar violation
0
0
Line 1 deactivated
0
1
Line 1 line signal present but not in sync
1
0
Line 1 activated bipolar violation (Note 1)
1
1
Line 1 activated no bipolar violation
0
0
Line 0 deactivated
0
1
Line 0 line signal present but not in sync
1
0
Line 0 activated bipolar violation (Note 1)
1
1
Line 0 activated no bipolar violation
Note 1
Bipolar Violation does not cause an Interrupt
STATUS REGISTER
Status information for all 4 channels may be read from the
common Status Register by addressing location X FF 2 bits
per line are coded as shown in Table VI A change in the
status of 1 or more lines is indicated by the INT pin being
pulled low provided bit 2 of the corresponding control regis-
ter is set to ‘‘ONE’’ to enable the interrupt for that line
BIPOLAR VIOLATION DETECTOR
On an activated line whenever a line error is received there
will be a violation of the AMI coding rule This is reported by
setting the code 10 for that line The violation indication is
cleared to 11 after a read of the Status Register
As an example of the interpretation of the Status Register
contents if the byte 2 read back from the Status Register
e
00111001 (eX 39) this indicates the following status of
the 4 lines line 3 is deactivated line 2 is in sync with no
error since the last read cycle line 1 is in sync but there has
been 1 or more errors since the last read cycle of the Status
Register line 0 is receiving a line signal but the line trans-
mission is not synchronized
Applications Information
POWER SUPPLIES
While the pins of the TP3404 QDASL device are well pro-
tected against electrical misuse it is recommended that the
standard CMOS practice of applying GND to the device be-
fore any other connections are made should always be fol-
lowed In applications where the printed circuit card may be
plugged into a hot socket with power and clocks already
present an extra long ground pin on the connector should
be used
To minimize noise sources the VDDA and VDDD pins
should be connected together via the shortest possible
trace likewise the GNDA and GNDD pins must be connect-
ed together These two connections can be done directly
underneath the part All other ground connections to each
device should meet at a common point as close as possible
to the GNDD pin in order to prevent the interaction of
ground return currents flowing through a common bus im-
pedance A power supply decoupling capacitor of 01 mF
should be connected from this common point to VDDD as
close as possible to the device pins
Figure 5 shows a typical 4 line application of the QDASL
The current list of suitable commercial transformers is
Schott Corporation (Nashville)
Phone 615-889-8800
Part numbers 67110850 (dry)
67110860 (50 mA DC)
Pulse Engineering (San Diego)
Phone 619-674-8100
Part number TBD
Note that the zener diode protection shown in
Figure 8 is
only intended as secondary protection for inside wiring ap-
plications primary protection is also necessary Further in-
formation
can
be
found
in
the
datasheet
for
the
TP340123 DASL devices and in Application Note AN-509
‘‘Using the TP340123 ISDN PBX Transceivers’’
10


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