83CXXX Unisonic Technologies, 83CXXX Datasheet - Page 4

• Manufacturer Part Number: 83CXXX
• Description: VOLTAGE MONITORS
• Manufacturer: Unisonic Technologies

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83CXXX
microprocessor in a known state. The UTC 83CXXX assert a reset signal as long as the V
drops below a preset threshold. When V
140ms. They have a function of preventing code-execution errors during power-up, power-down, or brownout
conditions by resetting.
reset.
Reset keeps working while MR is low, and when MR returns high it is for the reset Active Timeout Period (t
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.
Manual Reset Input
The UTC 83CXXX have a push-pull output stage. A microprocessor’s (µP’s) reset input initiates the
See the manual reset input section if you want to see function that the manual reset input ( MR ) can initiate a
Many products based on microprocessor need manual reset characteristic, allowing them to initiate a reset.
DETAILED DESCRIPTION
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
Figure 1. RESET Valid to V
CC
has risen over the reset threshold, the devices keep the signal for at least
Preliminary
83CXXX
V
UTC
GND
CC
CC
= Ground Circuit
RESET
100K
R1=
CC
power supply voltage
QW-R502-353.a
CMOS IC
4 of 6
RP
).