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LTC2908

更新时间： 2024-09-12 04:43:39
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
16页 169K
描述
Low Voltage Supervisorwith 27 Selectable Thresholds and Watchdog Timer

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LTC2908 数据手册

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LTC2917/LTC2918  
Low Voltage Supervisor  
with 27 Selectable Thresh-  
olds and Watchdog Timer  
DESCRIPTION  
The LTC®2917-A/LTC2917-B and LTC2918-A/LTC2918-B  
are low voltage single-supply monitors with selectable  
thresholds and an adjustable watchdog timer. The parts  
operate from 1.5V to 5.5V and consume a quiescent cur-  
rent of only 30μA.  
FEATURES  
■
9 Selectable Supply Voltages  
12V, 5V, 3.3V, 2.5V, 1.8V  
1.5V, 1.2V, 1V, +ADJ (0.5V)  
■
3 Selectable Tolerances  
–5%, –10%, –15% (LTC2917)  
■
Manual Reset Input (LTC2918)  
Two three state inputs select one of nine internally pro-  
grammedthresholdswithouttheneedforexternalresistors.  
FortheLTC2917,anadditionalthreestateinputdetermines  
the tolerance (–5%, –10%, –15%). The tolerance for the  
LTC2918isfixedat–5%.Thresholdaccuracyisguaranteed  
at 1.5% over the entire operating temperature range.  
Glitch filtering ensures reliable reset operation without  
false triggering.  
■
1.5V to 5.5V Supply Operation  
■
Adjustable Watchdog Timeout  
■
Windowed Watchdog Timeout for Higher Reliability  
Applications (LTC2917-B, LTC2918-B)  
■
6.2V Shunt Regulator for High Voltage Operation  
■
Guaranteed to 125˚C  
■
Guaranteed Threshold Accuracy: 1.5%  
■
Low Quiescent Current: 30μA Typical  
■
The reset timeout and the watchdog timeout may be set  
with no external components, or adjusted using an exter-  
nal capacitor. A windowed watchdog feature is available  
for high-reliability applications (B1 versions). A separate  
manual reset input on the LTC2918-A/LTC2918-B allows  
a simple push button interface.  
Power Supply Glitch Immunity  
■
Guaranteed RST for V ≥ 0.8V  
CC  
■
10-Lead MSOP Packages and (3mm × 2mm) DFN  
Packages  
APPLICATIONS  
■
Handheld Devices  
Operation to 125°C makes the LTC2917-A/LTC2917-B  
and LTC2918-A/LTC2918-B suitable for automotive ap-  
plications.  
■
Cell Phone Base Stations  
■
Automotive Control Systems  
■
Network Servers  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
■
Optical Networking Systems  
TYPICAL APPLICATION  
1.8V Supply Monitor with Manual  
Monitor Selection Table  
Reset and Internal Timers Selected  
1.8V  
NOMINAL VOLTAGE  
SEL1  
SEL2  
12V  
5V  
V
V
V
V
CC  
CC  
CC  
CC  
0.1μF  
10k  
Open  
GND  
3.3V  
V
CC  
2.5V  
Open  
Open  
Open  
GND  
GND  
GND  
V
CC  
LTC2918-A  
μP  
1.8V  
Open  
GND  
VM  
RST  
WDI  
RST  
I/O  
RT  
1.5V  
29178 TA01  
WT  
MR  
SEL1  
SEL2  
1.2V  
V
CC  
GND  
t = 1.6s  
WDU  
t = 200ms  
RST  
1V  
Open  
GND  
ADJ (0.5V)  
29178f  
1
1234567...16

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