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參數(shù)資料
| 型號： | L7582 |
| 廠商： | Lineage Power |
| 英文描述： | Ring Access Switch(振鈴存取開關(guān)) |
| 中文描述： | 環(huán)接入交換機(jī)（振鈴存取開關(guān)） |
| 文件頁數(shù)： | 9/16頁 |
| 文件大小： | 329K |
| 代理商： | L7582 |
Lucent Technologies Inc.
9
Data Sheet
November 1999
L7582 Tip Ring Access Switch
Switching Behavior
(continued)
Table 11. Break-Before-Make Operation
Notes:
Break-before-make operation can also be achieved using T
SD
as an input. In lines two and three of Table 11, instead of using the logic input pins
to force the all OFF state, force T
SD
to ground. This will override the logic inputs and also force the all OFF state. Hold this state for 25 ms. Dur-
ing this 25 ms all OFF state, toggle the inputs from 10 (ringing state) to 00 (idle/talk state). After 25 ms, release T
SD
to return switch control to
the input pins which will set the idle talk state.
When using the L7582 in this mode, forcing T
SD
to ground will override the INPUT pins and force an all OFF state. Setting T
SD
to 5 V will allow
switch control via the logic INPUT pins. However, setting T
SD
to 5 V will also disable the thermal shutdown mechanism. This is not recom-
mended. Therefore, to allow switch control via the logic INPUT pins, allow T
SD
to float.
Thus, when using T
SD
as an input, the two recommended states are 0 (overrides logic input pins and forces all OFF state) and float (allows
switch control via logic input pins and thermal shutdown mechanism is active). This may require use of an open collector buffer
Also note that T
SD
operation in L7582 is different than T
SD
operation of the L7581, where application of 5 V does not disable the thermal shut-
down mechanism.
ACCESS INPUT
T
SD
State
Timing
Break
Switches
1 & 2
Open
Ring
Return
Switch 3
Closed
Ring
Access
Switch 4
Closed
Line Access
Switches
5 & 6
Open
0 V
5 V
Float
Power
Ringing
All Off
—
5 V
5 V
Float
Hold this state for
≤
25 ms.
SW4 waiting for zero cur-
rent to turn off.
Zero current has occurred
and SW4 has opened.
Idle/Talk Release break switches.
Open
Open
Closed
Open
5 V
5 V
Float
All Off
Open
Open
Open
Open
0 V
0 V
Float
Closed
Open
Open
Open
Power Supplies
Both the 5 V and battery supply are brought onto the
L7582. The L7582 requires only the 5 V supply for
switch operation; that is, state control is powered exclu-
sively off of the 5 V supply. Because of this, the L7582
offers extremely low power dissipation, both in the idle
and active states.
The battery voltage is not used for switch state control.
The battery is used as a reference voltage by the
integrated secondary protection circuit. When the volt-
age at T
BAT
or R
BAT
drops 2 V to 4 V below the battery,
the integrated SCR will trigger, thus preventing
fault-induced overvoltage situations at the T
BAT
/R
BAT
nodes.
Loss of Battery Voltage
As an additional protection feature, the L7582 monitors
the battery voltage. Upon loss of battery voltage, the
L7582 will automatically enter an all OFF state and
remain in that state until the battery voltage is restored.
The L7582 is designed such that the device will enter
the all OFF state if the battery rises above –10 V and
will remain off until the battery drops below –15 V.
Monitoring the battery for the automatic shutdown fea-
ture will draw a small current from the battery, typically
4
μ
A. This will add slightly to the overall power dissipa-
tion of the device.
Impulse Noise
Using the L7582 will minimize and possibly eliminate
the contribution to the overall system impulse noise
that is associated with ringing access switches.
Because of this characteristic of the L7582, it may not
be necessary to incorporate a zero cross switching
scheme. This ultimately depends upon the characteris-
tics of the individual system and is best evaluated at
the board level.
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