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CS61884 датащи(PDF) 15 Page - Cirrus Logic

номер детали CS61884
подробное описание детали  Octal T1/E1/J1 Line Interface Unit
PDF  72 Pages
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производитель  CIRRUS [Cirrus Logic]
домашняя страница  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS61884 датащи(HTML) 15 Page - Cirrus Logic

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CS61884
DS485PP4
15
3.4 Cable Select
3.5 Status
SYMBOL
LQFP
FBGA
TYPE
DESCRIPTION
CBLSEL
93
G13
I
Cable Impedance Select
Host Mode - The input voltage to this pin does not effect
normal operation.
Hardware Mode - This pinis usedincombinationwiththe
LEN control pins (Refer to Table 5, “Hardware Mode Line
Length Configuration Selection,” on page 25) toset theline
impedance for all eight receivers and transmitters. This pin
also selects whether or not all eight receivers use an inter-
nal or external line matching network (Refer to the Table
below for proper settings).
NOTE: Refer to Figure 17 on page 51 and Figure 18 on
page 52 for appropriate external line matching com-
ponents. All transmitters use internal matching net-
works.
Table 3. Cable Impedance Selection
E1/T1/J1
CBLSEL
Transmitters
Receivers
T1/J1
No Connect
100
Ω Internal
Internal
T1/J1
HIGH
100
Ω Internal
Internal
T1/J1
LOW
100
Ω Internal
External
E1
No Connect
120
Ω Internal
Inter or Ext
E1
HIGH
75
Ω Internal
Internal
E1
LOW
75
Ω Internal
External
SYMBOL
LQFP
FBGA
TYPE
DESCRIPTION
LOS0
LOS1
LOS2
LOS3
LOS4
LOS5
LOS6
LOS7
42
35
75
68
113
106
3
140
K4
K3
K12
K11
E11
E12
E3
E4
O
O
O
O
O
O
O
O
Loss of Signal Output
The LOS output pins can be configured to indicate a loss of
signal (LOS) state that is compliant to either T1.231, ITU
G.775 or ETSI 300 233. These pins are asserted “High” to
indicate LOS. The LOS output returns low when an input
signal is present for the time period dictated by the associ-
ated specification (Refer to Loss-of-Signal (LOS) (See
Section 10.5 on page 27)).



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