83CXXX

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

4 of 5

www.unisonic.com.tw

QW-R502-353.c

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DETAILED DESCRIPTION

The UTC 83CXXX have a push-pull output stage. A microprocessor’s (µP’s) reset input initiates the

140ms. They have a function of preventing code-execution errors during power-up, power-down, or brownout

conditions by resetting.

See the manual reset input section if you want to see function that the manual reset input ( MR ) can initiate a

reset.

Manual Reset Input

Many products based on microprocessor need manual reset characteristic, allowing them to initiate a reset.

TTL or CMOS-logic levels, or with open-drain / collector outputs both can drive MR . MR will be started by a logic low

on manual reset .Because the input has a build-in 20kΩ pull-up resistor; it can be left open if it is not used. We can

put a 0.1µF capacitor from MR to ground if MR is driven from long cables or the device is used in a noisy

environment strengthening additional noise capacity. Connecting a normally open momentary switch from MR to

ground to create a manual-reset function, and external debounce circuitry is not required.

UTC

83CXXX

GND

RESET

R1=

100K