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UM810ACS Datasheet(PDF) 1 Page - Union Semiconductor, Inc. |
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UM810ACS Datasheet(HTML) 1 Page - Union Semiconductor, Inc. |
1 / 15 page ________________________________________________________________________ http://www.union-ic.com Rev.04 Dec.2013 1/15 UM809/810 3-Pin Microprocessor Reset Circuits UM809/810 SC70-3/SOT23-3 General Description The UM809/810 series are ultra low current, cost effective system supervisory circuits designed to monitor the power supplies in digital systems. They provide a reset signal to the host processor when necessary, offer excellent circuit reliability & low cost by eliminating external component and adjustment when used with +5V, +3.3V, +3.0V or other voltage powered circuits. The reset output is driven active within 10 µs of power supply falling through the reset voltage threshold. Reset is keeping active for a minimum of 140ms after system power supply has risen above the reset threshold. Reset threshold suitable for operation with variety of supply voltage are available. UM809 has an active-low reset output while UM810 has an active-high reset output. The UM809 / 810 are optimized to reject fast transient glitches on the power supply line, and the reset output are guaranteed to be in the correct logic state for power supply VCC down to 1V. Each of these ICs consists of a voltage reference comparator, resistors for detector threshold setting, delay generator, output driver & hysteresis circuit. The reset threshold & time delay are fixed with high accuracy internally and does not require any external adjustment. Low supply current of 3 µA (VCC=3V) makes UM809/810 ideal for low power application. Both devices are available in 3 Pin SC70 or SOT23 packages. Applications Features CPU and logic circuit Reset Power fail detector Computers Embedded system Battery powered equipment Intelligent instrument Wide operation voltage range of 1V to 10V Typical Quiescent current of 3μA No External components 3-Pin small SC70 and SOT23 packages VCC Transient immunity Correct logic output guaranteed to VCC=1.0V Precision VCC monitor for 2.5V, 3.0V, 3.3V, and 5.0V supplies Available in 2 output configurations Push-pull low active Reset output(UM809) Push-pull high active Reset output(UM810) Wide operation Temperature: -40 to 105 ℃℃ Pin Configurations Top View Top View Top View UM809/810 M: Monthly Code SC70-3/SOT23-3 |
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