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PDF 83C293 Data sheet ( Hoja de datos )

Número de pieza 83C293
Descripción VOLTAGE MONITORS
Fabricantes Unisonic Technologies 
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No Preview Available ! 83C293 Hoja de datos, Descripción, Manual

UNISONIC TECHNOLOGIES CO., LTD
83CXXX
Preliminary
4-PIN µP VOLTAGE MONITORS
WITH MANUAL RESET INPUT
DESCRIPTION
The UTC 83CXXX is a microprocessor supervisory circuit. It has
an active-low RESET and push-pull outputs. The circuit can assert
a reset signal as long as the VCC power supplies voltage dropping
below a preset threshold and it keep the reset signal for at least
140ms when VCC has risen above the reset threshold. The reset
threshold can be operated with multi-supply voltages.
The UTC 83CXXX provides the circuit with perfect reliability and
low cost through eliminating external components and adjustments
when applied with +5V, +3.3V, +3.0V power supply The UTC
83CXXX also provide a de-bounced manual reset input.
The reset comparator can work despite of fast transients on VCC,
and the outputs are guaranteed to be in the right logic state while
VCC is down to 1V.
In applications, the UTC 83CXXX is suitable for computers,
intelligent instruments, controllers, critical microprocessor and
microcomputer power monitors, portable or battery-powered
equipment, automotive.
FEATURES
* +3V, +3.3V, and +5V power-supply voltages
* Full temperature rated
* Supply current: 5µA
* Available in configuration: push-pull RESET output
* 140ms minimum power-on reset pulse width
* Guaranteed reset to VCC = +1V
* Power supply transient Immunity
* Eliminating external components
* Manual reset input
ORDERING INFORMATION
Ordering Number
83CXXXG-AD4-R
Note: XXX: Output Voltage, refer to Marking Information.
Package
SOT-143
CMOS IC
Packing
Tape Reel
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
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83C293 pdf
83CXXX
Preliminary
CMOS IC
APPLICATION INFORMATION
1. Ensuring a Valid Reset Output Down to VCC = 0
The UTC 83CXXX RESET output no more sinks current when VCC drops below 1V—it becomes an open 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 VCC
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 100kis 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.
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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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