ASM1233D ALSC [Alliance Semiconductor Corporation], ASM1233D Datasheet - Page 3

• Manufacturer Part Number: ASM1233D
• Description: Low Power, 5V/3.3V, uP Reset, Active LOW, Open-Drain Output
• Manufacturer: ALSC [Alliance Semiconductor Corporation]

March 2005
rev 1.3
Application Information
Operation - Power Monitor
The ASM1233D-L/1233D/1233M detects out-of-tolerance
power supply conditions. It resets a processor during power-
up, power-down and generates a reset to the system
processor when the monitored power supply voltage is below
the reset threshold. When an out-of-tolerance V
detected, the RESET signal is asserted. On power-up,
RESET is kept active (LOW) for approximately 350ms after
the power supply voltage has reached the selected tolerance.
This allows the power supply and microprocessor to stabilize
before RESET is released.
RESET
V
CC
Figure 1: Timing Diagram: Power-Up
V
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output
LTL
t
R
Notice: The information in this document is subject to change without notice
V
CCTP
V
t
RPU
HTL
CC
voltage is
V
OH
RESET
V
CC
Figure 2: Timing Diagram: Power-Down
V
HTL
V
CCTP
ASM1233D-L/D/M
t
F
V
t
OL
RPD
V
LTL
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