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TPS3818G50

更新时间： 2024-11-07 05:55:39
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德州仪器 - TI 监控
页数 文件大小 规格书
16页 634K
描述
Low Quiescent Current, Accurate Programmable-Delay Supervisory Circuit

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TPS3818G50 数据手册

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TPS3818  
www.ti.com ......................................................................................................................................................... SBVS106A–MAY 2008–REVISED AUGUST 2008  
Low Quiescent Current, Accurate Programmable-Delay  
Supervisory Circuit  
1
FEATURES  
DESCRIPTION  
23  
•
Power-On Reset Generator with Adjustable  
Delay Time: 1.25ms to 10s  
The  
TPS3818xxx  
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 the respective  
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 TPS3818 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. When used with an external capacitor, the  
TPS3818xxx gives a more accurate delay time than  
the similar TPS3808xxx device. The TPS3818 has a  
very low typical quiescent current of 2.4µA so it is  
well-suited to battery-powered applications. It is  
available in either 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  
1.2V  
3.3V  
DBV PACKAGE  
SOT23  
(TOP VIEW)  
6
5
4
1
2
3
RESET  
GND  
MR  
VDD  
VI/O VCORE  
SENSE VDD  
SENSE VDD  
SENSE  
CT  
TPS3818G12  
TPS3818G33  
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  
SENSE  
CT  
GND  
MR  
Typical Application Circuit  
1
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.  
2
3
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 © 2008, Texas Instruments Incorporated  
1234567...16

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