83C308 Unisonic Technologies, 83C308 Datasheet - Page 5

• Manufacturer Part Number: 83C308
• Description: 4-pin ?p Voltage Monitors With Manual Reset Input
• Manufacturer: Unisonic Technologies

83CXXX
1. Ensuring a Valid Reset Output Down to V
circuit. Therefore, high-impedance CMOS logic input connected to RESET can drift to undetermined voltages. This
presents no problem in most applications since most microprocessors and other circuitry can’t be operated when V
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
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.
supply has declined to 10% below nominal.
The UTC 83CXXX RESET output no more sinks current when V
Most microprocessor supervisor ICs has reset threshold voltages between 5% and 10% below the value of
The UTC 83C308 with high accuracy ensure that the reset is asserted closely to 5% limit and long before the
APPLICATION INFORMATION
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
Preliminary
CC
= 0
CC
drops below 1V—it becomes an open
QW-R502-353.a
CMOS IC
5 of 6
CC