Description

The supervisory circuits of the TPS3808G33MDBVREP microprocessor monitor system voltages between 0.4 and 5.0 V, asserting an open-drain RESET signal when the SENSE voltage falls below a predefined threshold or when the manual reset (MR) pin goes to a logic low. After the SENSE voltage and manual reset (MR) return over their respective thresholds, the RESET output remains low for the user-adjustable delay time.

To achieve 0.5 percent threshold accuracy for VIT ≤ 3.3 V, the TPS3808G33MDBVREP uses a precision reference. By disconnecting the CT pin, the reset delay time can be set to 20 milliseconds, 300 milliseconds by connecting the CT pin to VDD via a resistor, or user-adjusted between 1.25 milliseconds and 10 milliseconds by connecting the CT pin to an external capacitor. With a typical quiescent current of 2.4 μA, the TPS3808G33MDBVREP is well-suited to battery-powered applications. It comes in compact SOT-23 packaging and is completely defined throughout a temperature range of –55 to +125 degrees Celsius (TJ).

Features

? Manual Reset (MR) Input

? Open-Drain RESET Output

? Temperature Range: –55°C to 125°C

? Small SOT-23 Package

? 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

? Power-On Reset Generator With Adjustable Delay Time: 1.25 ms to 10 s

? Qualification Pedigree 

? Enhanced Product-Change Notification

? Enhanced Diminishing Manufacturing Sources (DMS) Support

? Controlled Baseline

– One Assembly Site

– One Test Site

– One Fabrication Site

? Extended Temperature Performance of –55°C to 125°C

Applications

? PDAs and Hand-Held Products

? Portable and Battery Powered Products

? FPGA and ASIC Applications

? DSP or Microcontroller Applications

? Notebook/Desktop Computers