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参数资料
| 型号： | ATTL7583BAJ-D |
| 厂商： | LEGERITY INC |
| 元件分类： | 通信及网络 |
| 英文描述： | SPECIALTY TELECOM CIRCUIT, PDSO28 |
| 封装： | PLASTIC, SOG-28 |
| 文件页数： | 3/21页 |
| 文件大小： | 398K |
| 代理商： | ATTL7583BAJ-D |
Data Sheet
February 2001
11
L7583A/B/C/D Line Card Access Switch
Switching Behavior (continued)
Table 14. Break-Before-Make Operation
Notes:
Break-before-make operation can be achieved using TSD as an input. In lines two and three of Table 14, instead of using the logic input pins to force the all
OFF state, force TSD to ground. This will override the logic inputs and also force the all OFF state. Hold this state for 25 ms. During this 25 ms all OFF state,
toggle the inputs from 10 (ringing state) to 00 (idle/talk state). After 25 ms, release TSD to return switch control to the input pins which will set the idle talk
state.
When using the L7583A/B/C/D in this mode, forcing TSD to ground will override the INPUT pins and force an all OFF state. Setting TSD to
5 V will allow switch control via the logic INPUT pins. However, setting TSD 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 TSD to float.
Thus, when using TSD 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 TSD operation in L7583 is different than TSD operation of the L7581, where application of 5 V does not disable the thermal shutdown mecha-
nism.
Power Supplies
Both the 5 V and battery supply are brought onto the L7583. The L7583 requires only the 5 V supply for switch operation; that
INPU
T
TESTin TESTout
TSD
State
Timing
Break
Switches
3 & 4
Ring
Return
Switch 7
Ring
Access
Switch 8
All Other
Switches
5 V
0 V
Float
Power
Ringing
—
Open
Closed
Open
5 V
0 V
5 V
Float
All Off
Hold this state for
≤25 ms. SW8 waiting for
zero current to turn off.
Open
Closed
Open
5 V
0 V
5 V
Float
All Off
Zero current has occurred
and SW8 has opened.
Open
0 V
Float
Idle/Talk Release break switches.
Closed
Open
is, state control is powered exclusively off of the 5 V supply.
Because of this, the L7583 offers extremely low power dissi-
pation, 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 sec-
ondary protection circuit. When the voltage at TBAT or RBAT
drops 2 V to 4 V below the battery, the integrated SCR will
trigger, thus preventing fault-induced overvoltage situations
at the TBAT/RBAT nodes.
Loss of Battery Voltage
As an additional protection feature, the L7583 monitors the
battery voltage. Upon loss of battery voltage, the L7583 will
automatically enter an all OFF state and remain in that state
until the battery voltage is restored. The L7583 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 feature
will draw a small current from the battery, typically
4 A. This will add slightly to the overall power dissipation
of the device.
Impulse Noise
Using the L7583 will minimize and possibly eliminate the
contribution to the overall system impulse noise that is asso-
ciated with ringing access switches. Because of this charac-
teristic of the L7583, it may not be necessary to incorporate a
zero cross switching scheme. This ultimately depends upon
the characteristics of the individual system and is best evalu-
ated at the board level.
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相关代理商/技术参数 |
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|---|---|
| ATTL7583BAJ-DT | 制造商:AGERE 制造商全称:AGERE 功能描述:Line Card Access Switch |
| ATTL7583BCG | 制造商:未知厂家 制造商全称:未知厂家 功能描述:LH1263 E&M Signaling Circuit |
| ATTL7583BF | 制造商:未知厂家 制造商全称:未知厂家 功能描述:LH1263 E&M Signaling Circuit |
| ATTL7583CAJ-D | 制造商:AGERE 制造商全称:AGERE 功能描述:Line Card Access Switch |
| ATTL7583CAJDT | 制造商:AGERE 功能描述:New |
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