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TPS3808_07

更新时间： 2024-11-20 05:03:43
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德州仪器 - TI 监控
页数 文件大小 规格书
21页 545K
描述
Low Quiescent Current, Programmable-Delay Supervisory Circuit

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TPS3808_07 数据手册

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TPS3808  
www.ti.com  
SBVS050F–MAY 2004–REVISED OCTOBER 2006  
Low Quiescent Current, Programmable-Delay  
Supervisory Circuit  
FEATURES  
DESCRIPTION  
•
Power-On Reset Generator with Adjustable  
Delay Time: 1.25ms to 10s  
The  
TPS3808xxx  
family  
of  
microprocessor  
supervisory circuits monitor system voltages from  
0.4V to 5.0V, asserting an open drain RESET signal  
when the SENSE voltage drops below a preset  
threshold or when the manual reset (MR) pin drops  
to a logic low. The RESET output remains low for the  
user adjustable delay time after the SENSE voltage  
and manual reset (MR) return above their thresholds.  
•
•
•
Very Low Quiescent Current: 2.4µA typ  
High Threshold Accuracy: 0.5% typ  
Fixed Threshold Voltages for Standard  
Voltage Rails from 0.9V to 5V and Adjustable  
Voltage Down to 0.4V Are Available  
•
•
•
•
Manual Reset (MR) Input  
The TPS3808 uses a precision reference to achieve  
0.5% threshold accuracy for VIT ≤ 3.3V. The reset  
delay time can be set to 20ms by disconnecting the  
CT pin, 300ms by connecting the CT pin to VDD using  
a resistor, or can be user-adjusted between 1.25ms  
and 10s by connecting the CT pin to an external  
capacitor. The TPS3808 has a very low typical  
quiescent current of 2.4µA so it is well-suited to  
battery-powered applications. It is available in a  
small SOT23 and an ultra-small 2mm × 2mm QFN  
PowerPAD™ package and is fully specified over a  
temperature range of –40°C to +125°C (TJ).  
Open-Drain RESET Output  
Temperature Range: –40°C to +125°C  
Small SOT23 and 2mm × 2mm QFN Packages  
APPLICATIONS  
•
•
•
•
•
DSP or Microcontroller Applications  
Notebook/Desktop Computers  
PDAs/Hand-Held Products  
Portable/Battery-Powered Products  
FPGA/ASIC Applications  
DBV PACKAGE  
SOT23  
1.2V  
3.3V  
(TOP VIEW)  
6
5
4
1
2
3
RESET  
GND  
MR  
VDD  
SENSE  
CT  
V
V
CORE  
SENSE  
V
SENSE V  
DD  
I/O  
DD  
TPS3808G12  
TPS3808G33  
DSP  
RESET  
MR  
RESET  
GPIO  
GND  
CT  
CT  
GND  
GND  
DRV PACKAGE  
2mm x 2mm QFN  
(TOP VIEW)  
VDD  
1
2
3
6
5
4
RESET  
Power  
PAD  
Typical Application Circuit  
SENSE  
CT  
GND  
MR  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas  
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
PowerPAD is a trademark of Texas Instruments.  
All other trademarks are the property of their respective owners.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2004–2006, Texas Instruments Incorporated  
1234567...21

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