TPS3808 Microprocessor Supervisory Circuits

TPS3808 Microprocessor Supervisory Circuits

Texas Instruments' TPS3808 family of microprocessor supervisory circuits monitors system voltages from 0.4 V to 5 V, 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.

The TPS3808 device uses a precision reference to achieve 0.5% threshold accuracy for VIT ≤ 3.3 V. The reset delay time can be set to 20 ms by disconnecting the CT pin to VDD using a resistor, or can be user-adjusted between 1.25 ms and 10 s by connecting the CT pin to an external capacitor. The TPS3808 device has a very low typical quiescent current of 2.4 µA, so it is well-suited to battery-powered applications. It is available in the SOT-23 and 2 mm x 2 mm WSON packages, and is fully specified over a temperature range of -40°C to 125°C (TJ).

Features
  • Power-on reset generator with adjustable delay
  • Time: 1.25 ms to 10 s
  • Very low quiescent current: 2.4 µA typical
  • High threshold accuracy: 0.5% typical
  • Fixed threshold voltages for standard voltage
  • Rails from 0.9 V to 5 V and adjustable voltage
  • Down to 0.4 V are available
  • Manual reset (MR) input
  • Open-drain RESET output
  • Temperature range: -40°C to +125°C
  • Small SOT-23 and 2 mm x 2 mm WSON packages
Applications
  • DSP or microcontroller applications
  • Notebook and desktop computers
  • PDAs and hand held products
  • Portable and battery-powered products
  • FPGA and ASIC applications
Manufacturer