RICOH R3118x SERIES LOW VOLTAGE DETECTOR with individual SENSE pin and delay function
Summary
The R3118x series are high-accuracy, CMOS voltage detector ICs essential for maintaining system stability and detecting undervoltage conditions. This manual details these sophisticated supervisors, which utilize separate power and sense pins to ensure reliable output signaling even upon detecting low voltages. Featuring adjustable reset delays and highly precise detection thresholds (0.6V to 5.0V), this product is ideal for embedded electronics engineers designing critical applications such as CPU/logic circuit resets, battery backup systems, or power failure detection circuits needing maximum reliability and minimal current consumption.
Page 1 Text Content
R3118x SERIES
LOW VOLTAGE DETECTOR with individual SENSE pin and delay function
NO.EA-242-111104
OUTLINE The R3118x series are CMOS-based voltage detector ICs with individual sense pin, high detector threshold accuracy and delay time, and ultra-low supply current, which can be operated at an extremely low voltage and is used for system reset as an example. Each of these ICs consists of a voltage reference unit, a hysteresis comparator, resistors net for detector threshold setting, an output driver transistor, and a delay circuit. VDD supply pin for the IC and voltage supervisory sense pin are individual, therefore the output pin can keep "L" level even if the sense pin voltage is going down to 0V, or there is no indefinite range for the sense pin. Since a delay circuit is built-in, by connecting an external capacitor, any output delay time can be set. In the R3118x series, detector released delay time can be set, and detector delay time is not influenced by the external capacitor for the delay time. The detector threshold is fixed with high accuracy internally and does not require any adjustment. The tolerance of the detector threshold is ±22.5m V (−VDET_S<1.6V) or ±1.5% (-VDET_S≥1.6V). Minimum detector threshold voltage is 0.6V, ultra low voltage detector threshold can be set. Output delay time for the detector release can be set with high accuracy. The tolerance of the IC side is ±30%. Two output types, Nch open drain type and CMOS type are available. If the sense pin voltage becomes to equal or lower than the detector threshold voltage, the output voltage becomes "L", and if the sense pin voltage becomes to released voltage, the output voltage becomes "H" after the set delay time. Three types of packages, SOT-23-5, SC-88A, and DFN(PLP)1212-6 are available.
FEATURES∗ • Supply Current ......................................................................Typ. 0.4μA (VSENSE≥+VDET, VDD=6V)
Consumption current through SENSE pin is not included.
• Operating Voltage Range......................................................1.0V to 6.0V (-40°C≤Topt≤85°C) • Detector Threshold Range....................................................0.6V to 5.0V (0.1V steps) (For other voltages, please refer to MARK INFORMATIONS.) • Accuracy Detector Threshold................................................±1.5% (-VDET_S≥1.6V), ±22.5m V (-VDET_S<1.6V) • Temperature-Drift Coefficient of Detector Threshold ............Typ. ±30ppm/°C • Accuracy Detector Released ................................................±30% • Temperature-Drift Coefficient of Detector Released .............Typ. ±0.16ppm/°C • Output Types.........................................................................Nch Open Drain and CMOS • Packages ..............................................................................DFN(PLP)1212-6, SC-88A , SOT-23-5
∗ Topt=25°C, unless otherwise noted.
APPLICATIONS • CPU and Logic Circuit Reset • Battery Checker • Window Comparator / Level discrimination • Battery Back-up Circuit • Power Failure Detector
Page Summary Contents For RICOH R3118x SERIES LOW VOLTAGE DETECTOR with individual SENSE pin and delay function
Manual Details
| Brand | Ricoh |
|---|---|
| Pages | 23 |
| File Size | 482.36 KB |
| Published | May 27, 2026 |
Enter the captcha to get the download link:
Frequently Asked Questions
How do I set the output delay time?
The output delay can be set by connecting an external capacitor to the designated pins.
What is the typical supply current consumption of this IC?
The typical supply current is 0.4μA, provided that V_SENSE $\geq$ +VDET and VDD=6V (sense pin consumption excluded).
Why are the VDD supply pin and voltage supervisory sense pin individual?
This design ensures the output pin remains in an "L" level even if the sense pin drops down to 0V or has no indefinite range.