IMP1834/A/D Dual 5V and 3.3V uP Power Supply Supervisors w/Manual Reset
●Selectable Trip Point Tolerance
■The IMP1834 supervisors simultaneously monitor both 3.3V and 5V power sources and issue reset signals when either supply is out of tolerance. When an out-of-tolerance condition is detected, the output-reset signal of the affected supply becomes active and resets the system microprocessor/ microcontroller. On power-up and after the supply voltage returns to an in-tolerance condition, the reset signal remains active for approximately 350ms. This allows the power supply and system microprocessor to stabilize.
■The IMP1834 supervisors are pin-compatible with devices from Dallas Semiconductor and require up to 40% less current.
■Tolerance levels are independently selectable for both supplies. Tolerance options are 5- and 10-percent for the 5V supply and for the 3.3V supply, 10- and 20-percent.
■The IMP1834 and IMP1834D have push-pull reset output stages. The IMP1834A active LOW reset outputs are open drain devices that can both be connected to either 5 volt or 3.3 volt supply. The IMP1834 and IMP1834A have active LOW reset outputs. The IMP1834D has active HIGH reset outputs.
■All devices can issue reset signals through an internally debounced pushbutton reset input that affects both reset outputs.
■All devices operate over the extended industrial temperature range. Devices are available in 8-pin DIP, surface mount 8-pin SO and 8-pin MicroSO packages. Die are also available.
●Key Features
■Lower power, pin-compatible replacements for the Dallas DS1834
◆40% lower maximum supply current: 30μA vs 50μA
■Monitor 5V and 3.3V supplies simultaneously
■5V and 3.3V power-on reset
■350ms reset time
■Debounced pushbutton reset input
■Push-Pull CMOS output
◆IMP1834, IMP1834D
◆Eliminates external pull-up resistors
◆Active LOW (IMP1834), HIGH (IMP1834D)
■Open drain output
◆IMP1834A
◆Active LOW
■Selectable 5V and 3.3V trip point tolerance
■Internal power drawn from highest input voltage, 5V or 3.3V
■Precision temperature-compensated voltage reference and comparator
■Low-cost surface mount SO, compact MicroSO and DIP packages
■Wide operating temperature, –40°C to +85°C
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IMP1834 、 IMP1834EMA 、 IMP1834S 、 IMP1834/D 、 IMP1834A 、 IMP1834AEMA 、 IMP1834AS 、 IMP1834A/D 、 IMP1834D 、 IMP1834DEMA 、 IMP1834DS |
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Datasheet |
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Please see the document for details |
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MicroSO;SO;DIP |
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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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191 KB |
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