1 Features

• Controlled Baseline
  • One Assembly Site
  • One Test Site
  • One Fabrication Site
• Extended Temperature Performance of –55°C to 125°C
• Enhanced Diminishing Manufacturing Sources (DMS) Support
• Enhanced Product-Change Notification
• Qualification Pedigree ⁽¹⁾
• 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: –55°C to 125°C
• Small SOT-23 Package

2 Applications

• DSP or Microcontroller Applications
• Notebook/Desktop Computers
• PDAs and Hand-Held Products
• Portable and Battery Powered Products
• FPGA and ASIC Applications

3 Description

The TPS3808xxx family of microprocessor supervisory circuits monitors system voltages from 0.4 V to 5.0 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 uses a precision reference to achieve 0.5% threshold accuracy for V_IT ≤ 3.3 V. The reset delay time can be set to 20 ms by disconnecting the C_T pin, 300 ms by connecting the C_T pin to V_DD using a resistor, or can be user-adjusted between 1.25 ms and 10 s by connecting the C_T pin to an external capacitor. The TPS3808 has a very low typical quiescent current of 2.4 μA, so it is well-suited to battery-powered applications. It is available in a small SOT-23 package, and is fully specified over a temperature range of –55°C to +125°C (T_J).

1. For all available packages, see the orderable addendum at the end of the datasheet.

Typical Application Circuit