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ASM1810 Datasheet(PDF) 3 Page - Alliance Semiconductor Corporation

Part No. ASM1810
Description  Low Power, 5V 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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ASM1810 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
ASM1810
February 2005
rev 1.4
Application Information
Operation - Power Monitor
The
ASM1810
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
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.
Output Conditions
The ASM1810 active LOW reset signal is valid as long as VCC
remains above 1.2V. However the RESET output on the
ASM1810 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 1). 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
Ω should be
adequate to maintain a valid connection.
Microprocessor
RESET
RESET
ASM1810
100kΩ
Figure 1: RESET Valid to 0V VCC
VOH
RESET
tRPU
VCCTP (MIN)
VCCTP
VCCTP (MAX)
tR
VCC
Figure 2: Timing Diagram: Power-Up
VCCTP (MIN)
VCCTP
VCCTP (MAX)
tF
VCC
tRPD
VOL
RESET
Figure 3: Timing Diagram: Power-Down


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