RICOH R3134x SERIES User's Guide and Manual
Summary
This advanced CMOS voltage detector IC is an ideal component for generating reliable system reset signals in low-voltage, critical applications like CPU resets and battery monitoring. The R3134x series offers fixed, highly accurate thresholds and integrates a built-in delay circuit (approx. 240ms) for predictable power sequencing. This documentation serves as an essential guide for embedded engineers, providing detailed block diagrams, selection criteria, pin configurations, and application details necessary to integrate the robust detector into complex hardware designs.
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R3134x SERIES
LOW VOLTAGE DETECTOR WITH BUILT-IN DELAY CIRCUIT
NO.EA-209-120404
OUTLINE R3134x Series are CMOS-based voltage detector ICs with built-in delay circuit, high detector threshold accuracy, and ultra low supply current, which can operate at low voltage. These ICs can be used as system reset generators, and each of these ICs consists of a voltage reference, a comparator, resistors for setting voltage detector threshold, an output driver transistor, manual reset circuit, and an output delay generator. Detector threshold is fixed internally with high accuracy and requires no adjustment. When a supply voltage crosses a setting detector threshold voltage from a high value to a lower value, this IC generates reset signal. R3134x Series output "L" at its detect. Since each of R3134x Series embeds an output delay generator, during a setting 240ms delay time, which is fixed in the IC, this IC keeps the reset condition after they are released. Released conditions will be kept for the delay time from when a supply voltage crosses a setting detector threshold voltage from a low value to a higher value, or from when the manual reset signal is released. Two output types, Nch open drain type and CMOS type, are available. Since the packages for these ICs are DFN(PLP)1212-6 (Limited), SOT-23-5, and SC-88A (Limited), high density mounting of the ICs on board is possible.
FEATURES • Supply Current ......................................................................Typ. 0.8μA (R3134x27Ex, VDD=3.0V) • Operating Voltage Range......................................................0.75V to 6.0V (Topt=25°C) • Detector Threshold Range....................................................1.0V to 5.0V (0.1V steps)
Further, 2.32V, 2.63V, 2.93V, 3.08V, 4.38V, and 4.63V can be provided as standard.
• Detector Threshold Accuracy................................................±1.8% • Temperature-Drift Coefficient of Detector Threshold ............Typ. ±100ppm/°C • Built-in Delay Time Circuit.....................................................Typ. 240ms • Output Delay Time Accuracy.................................................±15% • Output Types.........................................................................Nch Open Drain and CMOS • Packages ..............................................................................DFN(PLP)1212-6 (Limited),
SC-88A (Limited), SOT-23-5
APPLICATIONS • CPU and Logic Circuit Reset • Battery Checker • Window Comparator • Wave Shaping Circuit • Battery Back-up Circuit • Power Failure Detector
Page Summary Contents For RICOH R3134x SERIES User's Guide and Manual
Manual Details
| Brand | Ricoh |
|---|---|
| Pages | 23 |
| File Size | 336.10 KB |
| Published | June 05, 2026 |
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Frequently Asked Questions
What is the specified operating voltage range?
The Operating Voltage Range is 0.75V to 6.0V at Topt=25°C.
How accurate is the internal detector threshold and what levels are available?
The threshold accuracy is ±1.8% and can be designated from 1.0V to 5.0V in 0.1V steps.
What function does the built-in delay circuit serve?
It keeps the reset condition active for a fixed duration, typically 240ms, following detection or manual release.
Are there different output types available for selection?
Yes, two output types are available: Nch Open Drain and CMOS type.