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TPS3808_15 PDF预览

TPS3808_15

更新时间: 2024-11-25 02:58:15
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德州仪器 - TI /
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21页 680K
描述
Low-Quiescent-Current, Programmable-Delay Supervisory Circuit

TPS3808_15 数据手册

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TPS3808  
www.ti.com .......................................................................................................................................................... SBVS050JMAY 2004REVISED AUGUST 2008  
Low Quiescent Current, Programmable-Delay  
Supervisory Circuit  
1
FEATURES  
DESCRIPTION  
23  
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 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 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  
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  
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).  
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  
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  
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 © 2004–2008, Texas Instruments Incorporated  

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