DS04-27401-8Ea
FUJITSU MICROELECTRONICS
DATA SHEET
Copyright©2003-2008 FUJITSU MICROELECTRONICS LIMITED All rights reserved
2006.5
ASSP
BIPOLAR
Power Supply Monitor
with Watch-Dog Timer
MB3773
■ DESCRIPTION
MB3773 generates the reset signal to protect an arbitrary system when the power-supply voltage momentarily is
intercepted or decreased. It is IC for the power-supply voltage watch and “Power on reset” is generated at the
normal return of the power supply. MB3773 sends the microprocessor the reset signal when decreasing more
than the voltage, which the power supply of the system specified, and the computer data is protected from an
accidental deletion.
In addition, the watch-dog timer for the operation diagnosis of the system is built into, and various microprocessor
systems can provide the fail-safe function. If MB3773 does not receive the clock pulse from the processor for a
specified period, MB3773 generates the reset signal.
■ FEATURES
• Precision voltage detection (VS = 4.2 V ± 2.5 %)
• Detection threshold voltage has hysteresis function
• Low voltage output for reset signal (V
CC = 0.8 V Typ)
• Precision reference voltage output (V
R = 1.245 V ± 1.5%)
• With built-in watch-dog timer of edge trigger input.
• External parts are few.(1 piece in capacity)
• The reset signal outputs the positive and negative both theories reason.
• One type of package (SOP-8pin : 1 type)
■ APPLICATION
• Industrial Equipment
• Arcade Amusement etc.
