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ASM1817 Datasheet(PDF) 3 Page - Alliance Semiconductor Corporation

Part No. ASM1817
Description  Low Power, 3.3V/3.0V uP Reset, Active HIGH, Push-Pull Output
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Maker  ALSC [Alliance Semiconductor Corporation]
Homepage  http://www.alsc.com
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ASM1817 Datasheet(HTML) 3 Page - Alliance Semiconductor Corporation

   
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Notice: The information in this document is subject to change without notice
Low Power, 3.3V/3.0V µP Reset
ASM1817
rev 1.5
February 2005
Application Information
Operation - Power Monitor
The ASM1817 detects out-of-tolerance power supply
conditions. It resets a processor during power-up, power-
down and issues a reset to the system processor when the
monitored power supply voltage is below the reset threshold.
When an out-of-tolerance VCC voltage is detected, the
RESET signal is asserted. On power-up, RESET is kept
active (HIGH) for approximatley 150ms after the power
supply voltage has reached the selected tolerance. This
allows the power supply and microprocessor to stablize
before RESET is released.
Figure 1: Typical Application
Microprocessor
RESET
RESET
ASM1817
tRPU
VCCTP (MIN)
VCCTP
VCCTP (MAX)
tR
VCC
Figure 2: Timing Diagram: Power-Up
VOL
RESET
tRPD
VCC
VCCTP (MAX)
VCCTP
VCCTP (MIN)
tF
RESET
RESET Slews with VCC
VOH
Figure 3: Timing Diagram: Power-Down


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