R5105N Datasheet, PDF (1/14 Pages) RICOH electronics devices division – Microprocessor Supervisory Circuit

Microprocessor Supervisory Circuit
R5105N SERIES
NO. EA-159-070908
OUTLINE
The R5105N Series are CMOS-based µ con supervisory circuit, or high accuracy and ultra low supply current
voltage detector with built-in delay circuit and watchdog timer. When the supply voltage is down across the
threshold, or the watchdog timer does not detect the system clock from the µ con, the reset output is generated.
The voltage detector circuit is used for the system reset, etc. The detector threshold is fixed internally, and the
tolerance is ±1.0%. The released delay time (Power-on Reset Delay) circuit is built-in, and output delay time is
adjustable with an external capacitor. When the supply voltage becomes the released voltage, the reset state will
be maintained during the delay time. The time out period of the watchdog timer can be also set with an external
capacitor. The output type of the reset is selectable, Nch open-drain, or CMOS. The package is small SOT-23-6.
FEATURES
• Built-in a watchdog timer's time out period accuracy
±30%
• Timeout period for watchdog and generating a reset signal can be set by an external capacitor
• Detector Threshold Voltage ····························· 0.1V stepwise setting in the range from 1.5V to 5.5V
• Supply current ·················································· Typ. 11µA
• Operating Voltage ············································ 0.9V to 6.0V
• High Accuracy Output Voltage of Detector Threshold ············································· ±1.0%
• Power-on Reset Delay Time accuracy············· ±20%
• Power-on reset delay time of the voltage detector can be set with an external capacitor.
• Small Package ················································· SOT-23-6
APPLICATION
• Supervisory circuit for equipment with using microprocessors.
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