IMP161, IMP162 uP Supervisory Circuit
●Guaranteed MR Disable Period
■The IMP161 and IMP162 are low power supervisory circuits that monitor power supplies in microprocessor based systems. If the power supply drops below the reset threshold level, a reset is asserted and remains asserted for at least 800ms after VCC has risen above the reset threshold. An improved manual reset architecture gives the system designer additional flexibility.
■The debounced manual reset input is negative edge triggered. The reset pulse period generated by a MR transition is a minimum of 800ms and maximum of 2 sec. In addition, the MR input signal is blocked for an additional 49μS minimum after the reset pulse ends. During the MR disable period, the microcontroller is guaranteed a time period free of additional manual reset signals. During this period DRAM contents can be refreshed or other critical system tasks undertaken.
■Low supply current makes the IMP161/162 ideal for use in battery operated equipment. With 3V supplies power consumption is 8μW typically and 30μW maximum.
■The IMP161 has an open-drain, active-LOW RESET output and uses an external pull-up resistor. The IMP162 has an active-HIGH RESET output.
■Available in compact 4-pin SOT-143 packages, six voltage thresholds are offered to support 3.0V, 3.3V and 5V power systems.
●Key Features
■Edge triggered manual reset input
◆Single pulse output
◆49μS minimum MR disable period after reset
◆CMOS/TTL logic or switch interface
◆Debounced input
■Low supply current extends battery life
◆6μA/15μA typ/max at 5.5V
◆4.5μA/10μA typ/max at 3.6V
■Long reset period
◆0.8 sec minimum, 2 sec maximum
■Two reset polarity options
◆IMP161: Active LOW, open-drain
◆IMP162: Active HIGH
■Pinout matches the IMP811/812
■Small 4-pin SOT-143 package
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[ PDAs ][ Appliances ][ Computers ][ embedded controllers ][ Wireless communication systems ][ Embedded control systems ][ Battery-operated systems ][ Intelligent instruments ] |
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Datasheet |
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Please see the document for details |
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SOT-143;SOT143 |
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English Chinese Chinese and English Japanese |
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08/08/05 |
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Revision:A |
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192 KB |
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