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LE75183ADSC 参数 Datasheet PDF下载

LE75183ADSC图片预览
型号: LE75183ADSC
PDF下载: 下载PDF文件 查看货源
内容描述: [Telecom Circuit, 1-Func, PDSO20, GREEN, PLASTIC, SOIC-20]
分类和应用: 电信光电二极管电信集成电路
文件页数/大小: 30 页 / 290 K
品牌: ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
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Le75183  
Data Sheet  
Break  
Switches  
3 & 4  
Ring  
Return  
Switch 7  
Ring  
Access  
Switch 8  
All Other  
Switches  
INRING  
INTESTin  
INTESTout  
TSD  
State  
Timing  
Power  
Ringing  
1
0
0
1/Float  
Open  
Closed  
Closed  
Closed  
Open  
Hold this state for  
1
0
1
1/Float All Off  
Open  
Open  
Open  
25 ms. SW8 waiting for  
zero current to turn off.  
Zero current has occurred  
and SW8 has opened.  
1
0
0
0
1
0
1/Float All Off  
Open  
Open  
Open  
Open  
Open  
Open  
Open  
1/Float Idle/Talk  
Release break switches.  
Closed  
Table 10 - Break-Before-Make Operation  
Notes:  
Break-before-make operation can be achieved using TSD as an input. In lines two and three of Table 10, instead of using the logic input pins to  
force the all OFF state, force TSD to logic 0. 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 Le75183A/B/C in this mode, forcing TSD to logic 0 will override the INPUT pins and force an all OFF state. Setting TSD to logic  
1 will allow switch control via the logic INPUT pins. However, setting TSD to logic 1 will also disable the thermal shutdown mechanism. This is not  
recommended. 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 Le75183 is different than TSD operation of the L75181, where application of logic 1 does not disable the thermal  
shutdown mechanism.  
10.0 Power Supplies  
Though both the 5 V and battery supplies are brought onto the Le75183 device, only the 5 V supply is required for  
switch operation; that is, state control is powered exclusively off of the 5 V supply. Because of this, the Le75183  
device offers extremely low power dissipation, both in the Idle and Active states.  
The battery voltage is not used for switch state control, but rather as a reference voltage by the integrated  
secondary 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.  
11.0 Loss of Battery Voltage  
As an additional protection feature, the Le75183 device monitors the battery voltage. Upon loss of battery voltage,  
the Le75183 will automatically enter an all OFF state and remain in that state until the battery voltage is restored.  
The Le75183 is designed so that the device will enter the all OFF state if the battery rises above typically –10 V and  
will remain off until the battery drops below typically –15 V.  
Monitoring the battery for the automatic shutdown feature will draw a small current from the battery, typically 4 µA.  
This will add slightly to the overall power dissipation of the device.  
17  
Zarlink Semiconductor Inc.