Texas Instruments - TPS3305-18 Data Sheet
Summary
The TPS3305 family provides microprocessor-grade dual supervisory circuits for reliable system initialization across two independent power supplies (e.g., 3.3V/1.8V or 5V/3.3V). This manual details product specifications, including watchdog timer functionality, controlled reset logic, and various supply threshold options tailored for precise monitoring. Ideal for engineers designing advanced DSP-based, microcontroller, industrial control, and portable equipment requiring robust power management solutions.
Page 1 Text Content
SLVS198A – DECEMBER 1998 – REVISED DECEMBER 2002
Dual Supervisory Circuits for DSP and D OR DGN PACKAGE (TOP VIEW)
Processor-Based Systems Power-On Reset Generator With Fixed
SENSE1 VDD
Delay Time of 200 ms, no External
SENSE2 MR
Capacitor Needed
WDI RESET
Watchdog Timer Retriggers the RESET
GND RESET
Output at SENSEn ≥ VIT+ Temperature-Compensated Voltage Reference Maximum Supply Current of 40 µA Supply Voltage Range 2.7 V to 6 V Defined RESET Output From VDD ≥ 1.1 V MSOP-8 and SO-8 Packages Temperature Range 40°C to 85°C
typical applications Figure 1 lists some of the typical applications for the TPS3305 family, and a schematic diagram for a TI DSP-based system application. This application uses TI part numbers TPS3305–25, TPS7133, TPS71025, and TMS320VC549.
TPS7133 3.3 V
5 V – 10 V VOVI
TPS71025 2.5 V Applications using DSPs, Microcontrollers or Microprocessors Industrial Equipment Programmable Controls
VDD DSP
Automotive Systems
SENSE 1 DVDD Portable/Battery Powered Equipment
External
Reset SENSE 2MR CVDD Intelligent Instruments
Source TMS320VC549TPS3305–25 Wireless Communication Systems
Notebook/Desktop Computers
RESET RESET WDI XF
GND GND
Figure 1. Applications Using the TPS3305 Family
description The TPS3305 family is a series of micropower supply voltage supervisors designed for circuit initialization, primarily in DSP and processor-based systems, which require two supply voltages.
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.
TMS320 DSP family is a trademark of Texas Instruments.
!" # $"%&! ' #( Copyright 2002, Texas Instruments Incorporated
1POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Page Summary Contents For Texas Instruments - TPS3305-18 Data Sheet
Manual Details
| Brand | Texas Instruments |
|---|---|
| Pages | 17 |
| File Size | 376.12 KB |
| Published | June 15, 2026 |
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Frequently Asked Questions
How long until the RESET output becomes active after power-on?
The return of the RESET output to an inactive state has a fixed internal delay time ($t_{delay}$) of 200 ms.
What happens if the watchdog timing is missed?
If the supervising system fails to retrigger the watchdog circuit using WDI, RESET becomes active after the 1.6 s time-out interval.
What operational temperature range are these supervisors rated for?
The TPS3305 family is characterized for operation over a temperature range of –40°C to 85°C and comes in MSOP-8 or SO-8 packages.