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R3116Q461C Schematic ( PDF Datasheet ) - RICOH

Teilenummer R3116Q461C
Beschreibung 0.8% Low Voltage Detector
Hersteller RICOH
Logo RICOH Logo 




Gesamt 30 Seiten
R3116Q461C Datasheet, Funktion
R3116x Series
0.8% Low Voltage Detector with Output Delay
NO.EA-161-140819
OUTLINE
The R3116x series are CMOS-based voltage detector ICs with high detector threshold accuracy 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 comparator, resistors for detector threshold setting,
an output driver, a hysteresis circuit and an output delay circuit. The detector threshold is internally fixed with high
accuracy and does not require any adjustment.
Two output types, Nch open drain type and CMOS type are available.
The R3116x series are operable at a lower voltage than that of the R3112x series, and can be driven by a
single battery.
Three types of packages, SOT-23-5, SC-82AB, and DFN(PLP)1010-4 are available.
FEATURES
Supply Current ......................................................................Typ. 0.35μA (-VDET=1.5V, VDD=-VDET+1V)
Operating Voltage Range......................................................0.5V to 6.0V (Topt=25°C)
Detector Threshold Range....................................................0.7V to 5.0V (0.1V step)
Detector Threshold Accuracy................................................±0.8% (-VDET 1.5V)
Temperature-Drift Coefficient of Detector Threshold ............Typ. ±30ppm/°C
Built-in Output Delay Circuit..................................................Typ. 100ms with an external capacitor: 0.022μF
Output Delay Time Accuracy.................................................±15% (-VDET 1.5V)
Output Types.........................................................................Nch Open Drain "L" and CMOS
Packages ..............................................................................DFN(PLP)1010-4, SC-82AB, SOT-23-5
APPLICATIONS
CPU and Logic Circuit Reset
Battery Checker
Window Comparator
Wave Shaping Circuit
Battery Back-up Circuit
Power Failure Detector
1






R3116Q461C Datasheet, Funktion
R3116x
NO.EA-161-140819
TIMING CHART
Supply
Voltage
(VDD)
Released Voltage (+VDET)
Detector Threshold (-VDET)
CD Pin
Voltage
CD Pin Threshold Voltage
(VTCD)
GND
Output
Voltage
(VOUT)
GND
Output Delay Time (tD) Detect Delay Time (tPHL)
Output Delay Time
When the supply voltage, which is higher than
released voltage, is forced to VDD pin, charge to
an external capacitor starts, then CD pin voltage
increases. Until the CD pin voltage reaches to CD
pin threshold voltage, output voltage maintains
"L". When the CD pin voltage becomes higher
than CD pin threshold voltage, output voltage is
reversed from "L" to "H". Where the time interval
between the rising edge of supply voltage and
output voltage reverse point means output delay
time.
When the output voltage reverses from "L" to
"H", the external capacitor starts to discharge.
Therefore, when lower voltage than the detector
threshold voltage is forced to VDD pin, the output
voltage reverses from "H" to "L" thus the detect
delay time is constant not being affected by the
external capacitor.
Output Delay Time (tD) can be calculated with the next formula using the external capacitor:
tD(s) = 4.5 × 106 × CD(F)
DEFINITION OF OUTPUT DELAY TIME
Output Delay Time (tD) is defined as follows:
1. In the case of Nch Open Drain Output:
Under the condition of the output pin (OUT) is pulled up through a resistor of 470kΩ to 5V, the time interval
between the rising edge of VDD pulse from (-VDET)0.1V to (-VDET)×1.1V pulse voltage is supplied, the becoming
of the output voltage to 2.5V.
2. In the case of CMOS Output:
The time interval between the rising edge of VDD pulse from (-VDET)0.1V to (-VDET)×1.1V pulse voltage is
supplied, the becoming of the output voltage to ((-VDET)×1.1V)/2.
VDET×1.1V
Supply
Voltage
(VDD) VDET0.1V
GND
5.0V
Output
Voltage
(VOUT)
2.5V
GND
tPHL
tD
Nch Open Drain Output
(R3116xxx1A)
VDET×1.1V
Supply
Voltage
(VDD) VDET0.1V
GND
VDET×1.1V
(VDET×1.1V)/2
Output
Voltage
(VOUT)
GND
tPHL
CMOS Output
(R3116xxx1C)
tD
6

6 Page









R3116Q461C pdf, datenblatt
R3116x
NO.EA-161-140819
TECHNICAL NOTES
When connecting resistors to the device’s input pin
When connecting a resistor (R1) to an input of this device, the input voltage decreases by [Device’s
Consumption Current] x [Resistance Value] only. And, the cross conduction current*1, which occurs when
changing from the detecting state to the release state, is decreased the input voltage by [Cross Conduction
Current] x [Resistance Value] only. And then, this device will enter the re-detecting state if the input voltage
reduction is larger than the difference between the detector voltage and the released voltage.
When the input resistance value is large and the VDD is gone up at mildly in the vicinity of the released voltage,
repeating the above operation may result in the occurrence of output.
As shown in Figure A/B, set R1 to become 100kor less as a guide, and connect CIN of 0.1μF and more to
between the input pin and GND. Besides, make evaluations including temperature properties under the actual
usage condition, with using the evaluation board like this way. As result, make sure that the cross conduction
current has no problem.
R1
CIN*2
VDD
Voltage
Detector
GND
OUT pin
Figure A
R1
R2 CIN*2
VDD
Voltage
Detector
GND
Figure B
OUT pin
*1 In the CMOS output type, a charging current for OUT pin is included.
*2 Note the bias dependence of capacitors.
12

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