CONSONANCE

www.consonance-elec.com

5

REV 1.0

Application Information

In addition to outputting a low level at RES pin during low power supply, power-down, and brownout

conditions, the CN61C series is relatively immune to short-duration negative-going VCC transients

(glitches). As the magnitude of the transient increases (goes farther below the reset threshold), the

maximum allowable pulse width decreases. Typically, a VCC transient that goes 100mV below the reset

threshold and lasts 10µs or less will not cause a reset pulse. A 0.1µF bypass capacitor mounted as close as

possible to the VCC pin provides additional transient immunity.

Power-on Reset Circuit

The CN61C series with open drain output can be used to generate the power-on reset signal for a

microprocessor, microcontroller or memory, etc. A capacitor should be used between RES pin and GND to

generate a delay with pull-up resistor as shown in Figure 4.

Figure 4

Power-on Reset Circuit