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ASM1815 Datasheet(PDF) 3 Page - Alliance Semiconductor Corporation

Part No. ASM1815
Description  Low Power, 3.3V/3.0V uP Reset Active LOW, Push-Pull Output
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Maker  ALSC [Alliance Semiconductor Corporation]
Homepage  http://www.alsc.com
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ASM1815 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
ASM1815
rev 1.4
February 2005
Application Information
Operation - Power Monitor
The ASM1815 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 (LOW) 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.
Output Conditions
The ASM1815 active LOW reset signal is valid as long as
VCC remains below 1.2V. The RESET output on the
ASM1815 uses a push-pull drive stage that can maintain a
valid output below 1.2V. To sink current with VCC below 1.2V,
a resistor can be connected from the reset pin (RESET) to
Ground (see Figure 3). This configuration will give a valid
value on the RESET output with VCC approaching 0V. During
both power up and down, this configuration will draw current
when the RESET is in the high state. A value of 100k
should be adequate to maintain a valid connection.
Figure 3: RESET Valid to 0V VCC
Microprocessor
RESET
RESET
ASM1815
100kΩ
tRPU
VCCTP (MIN)
VOH
VCCTP
VCCTP (MAX)
tR
VCC
RESET
Figure 1: Timing Diagram: Power-Up
VCCTP (MIN)
VCCTP
VCCTP (MAX)
tF
VCC
tRPD
VOL
RESET
Figure 2: Timing Diagram: Power-Down


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