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Reset & watchdog ICs

TPS3809

ACTIVE

3-pin voltage supervisor (reset IC) with active-low, push-pull reset

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Data sheet

TPS3809

ACTIVE
Data sheet Order now

Product details

Rating Catalog Number of supplies monitored 1 Threshold voltage 1 (typ) (V) 2.25, 2.64, 2.93, 4.55 Features Ease-of-use, Lamp Intensity Control, Manual reset capable, Reset time delay, Undervoltage monitor only Reset threshold accuracy (%) 1.9, 2.2 Iq (typ) (mA) 0.00022, 0.009 Output driver type/reset output Active-low, Push-Pull Time delay (ms) 10, 200 Watchdog timer WDI (s) None Operating temperature range (°C) -40 to 85
Rating Catalog Number of supplies monitored 1 Threshold voltage 1 (typ) (V) 2.25, 2.64, 2.93, 4.55 Features Ease-of-use, Lamp Intensity Control, Manual reset capable, Reset time delay, Undervoltage monitor only Reset threshold accuracy (%) 1.9, 2.2 Iq (typ) (mA) 0.00022, 0.009 Output driver type/reset output Active-low, Push-Pull Time delay (ms) 10, 200 Watchdog timer WDI (s) None Operating temperature range (°C) -40 to 85
SOT-23 (DBV) 3 8.12 mm² (2.9 mm × 2.8 mm)
  • 3-pin SOT-23 package
  • Supply current of 9 µA (typical)
  • Precision supply voltage monitor 2.5 V, 3 V, 3.3 V, 5 V
  • Pin-for-pin compatible with MAX 809
  • Temperature range:  –40°C to +85°C
  • 3-pin SOT-23 package
  • Supply current of 9 µA (typical)
  • Precision supply voltage monitor 2.5 V, 3 V, 3.3 V, 5 V
  • Pin-for-pin compatible with MAX 809
  • Temperature range:  –40°C to +85°C

The TPS3809 family of supervisory circuits provides circuit initialization and timing supervision, primarily for DSPs and processor-based systems. The newer TLV809E device is an alternative with the same pins, functions and electrical parameters.

During power-on, RESET is asserted when the supply voltage VDD becomes higher than 1.1 V. Thereafter, the supervisory circuit monitors VDD and keeps RESET active as long as VDD remains below the threshold voltage VIT. An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset. The delay time, td(typ) = 200 ms, starts after VDD has risen above the threshold voltage VIT. When the supply voltage drops below the threshold voltage VIT, the output becomes active (low) again. No external components are required. All the devices of this family have a fixed sense-threshold voltage VIT set by an internal voltage divider.

The product spectrum is designed for supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The circuits are available in a 3-pin SOT-23. The TPS3809 devices are characterized for operation over a temperature range of –40°C to 85°C.

The TPS3809 family of supervisory circuits provides circuit initialization and timing supervision, primarily for DSPs and processor-based systems. The newer TLV809E device is an alternative with the same pins, functions and electrical parameters.

During power-on, RESET is asserted when the supply voltage VDD becomes higher than 1.1 V. Thereafter, the supervisory circuit monitors VDD and keeps RESET active as long as VDD remains below the threshold voltage VIT. An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset. The delay time, td(typ) = 200 ms, starts after VDD has risen above the threshold voltage VIT. When the supply voltage drops below the threshold voltage VIT, the output becomes active (low) again. No external components are required. All the devices of this family have a fixed sense-threshold voltage VIT set by an internal voltage divider.

The product spectrum is designed for supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The circuits are available in a 3-pin SOT-23. The TPS3809 devices are characterized for operation over a temperature range of –40°C to 85°C.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet TPS3809x 3-Pin Supply Voltage Supervisors datasheet (Rev. D) PDF | HTML Dec 24, 2020
Application note Voltage Supervisors (Reset ICs): Frequently Asked Questions (FAQs) (Rev. A) Mar 17, 2020
Selection guide Voltage Supervisors (Reset ICs) Quick Reference Guide (Rev. H) Feb 28, 2020
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun 28, 2019
User guide A Design Review of a Full-Featured 350-W Offline Power Converter Dec 18, 2013

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