可编程延迟监控电路Reset IC- ZCC3808 replace TPS3808.pdf

1 ZCC3808 FUNCTIONAL DESCRIPTION MAIN FEATURES The ZCC3808 family of microprocessor supervisory • Power-On Reset Generator with Adjustable circuits monitors system voltages from 0.4 V to Delay Time: 1.25 ms to 10 s 5V, asserting an open-drain signal when • Very Low Quiescent Current: 1.7 μA Typical the SENSE voltage drops below a preset threshold • High Threshold Accuracy: 0.5% Typ or when the manual reset () pin drops to a • Fixed Threshold Voltages for Standard logic low. The output remains low for Voltage Rails from 0.9 V to 5 V and the user-adjustable delay time after the SENSE Adjustable Voltage Down to 0.4 V Are voltage and manual reset () return above the Available respective thresholds. • Manual Reset () Input The ZCC3808 device uses a precision reference to • Open-Drain Output achieve 0.5% threshold accuracy for VIT ≤ 3.3 V. • Temperature Range: –40°C to 125°C The reset delay time can be set to 20 ms by • Small SOT-23 and 2-mm × 2-mm WSON disconnecting the CT pin, 300 ms by connecting Packages the CT pin to VDD using a resistor, or can be user- adjusted between 1.25 ms and 10 s by connecting APPLICATIONS the CT pin to an external capacitor. The ZCC3808 device has a very low typical quiescent current of • DSP or Microcontroller Applications 1.7 μA, so it is well-suited to battery-powered • Notebook and Desktop Computers applications. It is availab