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參數資料
| 型號： | L9311 |
| 英文描述： | Line Interface and Line Access Circuit Full-Feature SLIC with High Longitudinal Balance, Ringing Relay,and GR-909 Test Access |
| 中文描述： | 線路接口和線路接入電路全功能用戶接口高縱向平衡，振鈴繼電器，和GR - 909測試訪問 |
| 文件頁數： | 5/50頁 |
| 文件大小： | 852K |
| 代理商： | L9311 |
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Data Sheet
July 2001
Ringing Relay, and GR-909 Test Access
L9311 Full-Feature SLIC with High Longitudinal Balance,
Agere Systems Inc.
5
Description
(continued)
The second chip is manufactured in Agere dielectrically
isolated 320 V bipolar CMOS diffused metal oxide
semiconductor (BCDMOS III) technology. This chip
contains the following:
I
Ring access relay
I
Scan clamp circuitry
I
Logic control
I
Ring trip
I
Test
I
Thermal shutdown
I
Battery monitor circuit
The LILAC family requires a +5 V and battery supply to
operate. No
–
5 V supply is required. A battery switch is
included that automatically, based on subscriber loop
length, will apply either the primary higher-voltage bat-
tery or an optional lower-voltage auxiliary battery. Use
of this feature will minimize off-hook power dissipation.
The switch point is a function of the user-programmed
dc current limit and the magnitude of the auxiliary bat-
tery. Switching from the high-voltage to low-voltage
battery is quiet, without interruption of the dc loop cur-
rent, thus preventing any impulse noise generation at
the switch point. Design equations for the switch point
and a graph showing loop/battery current versus loop
resistance are given in the dc Characteristics section of
this data sheet.
If the user does not want to provide an auxiliary battery,
the design of the L9311 battery switch allows use of a
power control resistor at the auxiliary battery input. This
scheme will not reduce short-loop, off-hook power dis-
sipation, but it will control power dissipation on the
SLIC by sharing power among the SLIC, power resis-
tor, and dc loop. However, in most cases, without the
auxiliary battery, the power dissipation capabilities of
the 44-pin PLCC package are adequate so that the
power control resistor will not be needed. Design equa-
tions for power control options are given in the dc Char-
acteristics section of this data sheet.
The L9311 has two active transmission ready states,
forward active and reverse active. Both on-hook and
off-hook transmission are provided during the forward
and reverse battery modes. Battery reversal is quiet,
without breaking the ac path. Rate of battery reversal
may be ramped to control switching time via optional
external capacitors
.
Equations relating rate of battery
reversal to these optional external capacitors are given
in the dc Characteristics, Power Control section of this
data sheet.
A low-power scan mode is available to reduce idle
mode on-hook power. This mode is realized by using a
scan clamp circuit. In low-power scan mode:
I
The scan clamp circuitry is active.
I
Loop closure is active.
I
All ac transmission, dc feed, and other supervision
circuits, including ring trip, are shut down.
I
Test is powered down.
I
Thermal shutdown is active.
I
Low battery sense shutdown is on.
I
On-hook transmission is disabled.
A forward disconnect mode, where all circuits are
turned off and power is denied to the loop, is also pro-
vided. During this mode, the NSTAT supervision output
will read on-hook.
In the ring mode, the line break switches are opened
and the power ring access switches are closed. In this
mode, the ring trip detector in the SLIC is active and all
other detectors and the tip/ring drive amplifiers are
turned off to conserve power.
Make-before-break or break-before-make switching is
achievable during ring cadence or ring trip. Toggling
directly into or directly out of the ring mode table will
give make-before-break switching. To achieve break-
before-make switching, go to an intermediate all-off
state (use forward disconnect state) before entering the
ring mode or before leaving the ring mode. See the
Switching Behavior section of this data sheet for more
details on switching behavior.
Voltage transients or impulse noise associated with
ring cadence or ring trip are minimized or eliminated
with the L9311, thus possibly eliminating the need for
external zero-cross switching circuitry.
A tip open switch configuration is also available for
ground start applications. A common-mode current
detector is included.
Both the ring trip and loop closure supervision func-
tions are included. Loop closure threshold is set by
applying a voltage source to the LCTH input. The volt-
age source may be an external voltage source or
derived from the SLIC V
REF
output. A programmable
external voltage source may be used to provide soft-
ware control of the loop closure threshold. Design
equations for the loop closure threshold are given in
the Supervision section of this data sheet.
Hysteresis is
included.
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PDF描述 |
|---|---|
| L9312 | Line Interface and Line Access Circuit Forward Battery SLIC and Ringing Relay for TR-57 Applications |
| L9313 | Line Interface and Line Access Circuit Full-Feature SLIC and Ringing for TR-57 Applications |
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| L9355 | Dual Peripheral Driver |
| L9500A | High-Voltage Ringing SLIC for VolP Applications |
相關代理商/技術參數 |
參數描述 |
|---|---|
| L9312 | 制造商:AGERE 制造商全稱:AGERE 功能描述:Line Interface and Line Access Circuit Forward Battery SLIC and Ringing Relay for TR-57 Applications |
| L9313 | 制造商:AGERE 制造商全稱:AGERE 功能描述:Line Interface and Line Access Circuit Full-Feature SLIC and Ringing for TR-57 Applications |
| L9324 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Dual Peripheral Driver |
| L9326 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| L-932P3C | 制造商:Kingbright Corporation 功能描述: |
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