83CXXX

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

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www.unisonic.com.tw

QW-R502-353.c

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APPLICATION INFORMATION

Therefore, high-impedance CMOS logic input connected to RESET can drift to undetermined voltages. This

is under 1V. In figure 1, however, in applications where RESET must be valid down to 0V. In order to causes any

stray leakage currents to flow to ground, adding a pull-down resistor to RESET , that holding RESET low. (R1’s

value is not critical and the value 100kΩ is large enough not to load RESET and small enough to pull RESET to

ground).

2. Benefits of Highly Accurate Reset Threshold

Most microprocessor supervisor ICs has reset threshold voltages between 5% and 10% below the value of

nominal supply voltages. If using ICs rated at only the nominal supply ±5%, this leaves an uncertainty zone where

the supply is between 5% and 10% low and where the reset may or may not be asserted.

The UTC 83C308 with high accuracy ensure that the reset is asserted closely to 5% limit and long before the

supply has declined to 10% below nominal.

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TYPICAL APPLICATION CIRCUIT

UTC assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or

other parameters) listed in products specifications of any and all UTC products described or contained

herein. UTC products are not designed for use in life support appliances, devices or systems where

malfunction of these products can be reasonably expected to result in personal injury. Reproduction in

whole or in part is prohibited without the prior written consent of the copyright owner. The information

presented in this document does not form part of any quotation or contract, is believed to be accurate

and reliable and may be changed without notice.