Texas Instruments TPS3808 Low Quiescent Current, Programmable-Delay Supervisory Circuit
Summary
This programmable-delay supervisory circuit monitors system voltages from 0.4V to 5.0V, ensuring stable operation by generating a precise reset signal when voltage thresholds are crossed or manually triggered. Featuring very low quiescent current and adjustable delay times (1.25ms–10s), it is essential for reliable power management in battery-powered devices. It is ideal for mission-critical applications including DSPs, microcontrollers, handheld products, PDAs, and portable electronics requiring stable voltage supervision across industrial temperature ranges.
Page 1 Text Content
TPS3808
www.ti.com
SBVS050B–MAY 2004–REVISED OCTOBER
Low Quiescent Current, Programmable-Delay
Supervisory Circuit
FEATURES DESCRIPTION
Power-On Reset Generator with Adjustable
The TPS3808xxx family of microprocessor supervis-
Delay Time: 1.25ms to 10s ory circuits monitor system voltages from 0.4V to
Very Low Quiescent Current: 2.4µA typ 5.0V, asserting an open drain RESET signal when•
the SENSE voltage drops below preset threshold or•
High Threshold Accuracy: 0.5% typ
when the manual reset (MR) pin drops to logic low.
Fixed Threshold Voltages for Standard
The RESET output remains low for the user adjust-
Voltage Rails from 0.9V to 5V and Adjustable able delay time after the SENSE voltage and manual
Voltage Down to 0.4V Are Available reset (MR) return above their thresholds.
Manual Reset (MR) Input
The TPS3808 uses precision reference to achieve
Open-Drain RESET Output 0.5% threshold accuracy for VIT 3.3V. The reset•
delay time can be set to 20ms by disconnecting the•
Temperature Range: -40°C to 125°C
CT pin, 300ms by connecting the CT pin to VDD using
Small SOT23 Package
resistor, or can be user-adjusted between 1.25ms
and 10s by connecting the CT pin to an external
APPLICATIONS capacitor. The TPS3808 has very low typical
DSP or Microcontroller Applications quiescent current of 2.4µA so it is well-suited to•
battery-powered applications. It is available in small•
Notebook/Desktop Computers
SOT23 package and is fully specified over tempera-•
PDAs/Hand-Held Products
ture range of -40°C to +125°C.
Portable/Battery-Powered Products
FPGA/ASIC Applications
DBV PACKAGE SOT23 VI/O VCORE (TOP VIEW)
SENSE SENSE VDDVDD
TPS3808G12 TPS3808G33 DSP RESET VDD
GND SENSE
RESET MR
RESET GPIO
MR CT
GNDGNDGND
Figure 1. Typical Application Circuit
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.
PRODUCTION DATA information is current as of publication date. Copyright 2004, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Page Summary Contents For Texas Instruments TPS3808 Low Quiescent Current, Programmable-Delay Supervisory Circuit
Manual Details
| Brand | Texas Instruments |
|---|---|
| Pages | 13 |
| File Size | 280.23 KB |
| Published | June 17, 2026 |
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Frequently Asked Questions
Under what conditions is the RESET output signal asserted low?
The RESET output drops when the SENSE voltage falls below a preset threshold or when the manual reset (MR) pin drops to a logic low.
How can I adjust the time delay for the reset function?
The delay time is user-adjustable between 1.25ms and 10s by connecting the CT pin to an external capacitor and resistor.
Is this supervisory circuit suitable for battery-powered applications?
Yes, it features a very low typical quiescent current of 2.4µA, making it well-suited for battery-powered applications.
What precaution should be taken when installing this integrated circuit?
Be aware that the device can be damaged by ESD, and proper handling procedures are recommended to prevent performance degradation or failure.