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ASM1812 Datasheet(PDF) 3 Page - Alliance Semiconductor Corporation

Part No. ASM1812
Description  Low Power 5V 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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ASM1812 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 5V µP Reset
ASM1812
rev 1.4
February 2005
Application Information
Operation - Power Monitor
The ASM1812 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 approximately 150ms after the power
supply voltage has reached the selected tolerance. This
allows the power supply and microprocessor to stabilize
before RESET is released.
Microprocessor
RESET
RESET
ASM1812
Figure 1: Typical Application
tRPU
VCCTP (MIN)
VCCTP
VCCTP (MAX)
tR
VCC
VOL
RESET
Figure 2: Timing Diagram: Power-Up
tRPD
VCC
VCCTP (MAX)
VCCTP
VCCTP (MIN)
tF
RESET
RESET Slews with VCC
VOH
Figure 3: Timing Diagram: Power-Down


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