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R3117K281C Schematic ( PDF Datasheet ) - RICOH

Teilenummer R3117K281C
Beschreibung LOW VOLTAGE DETECTOR
Hersteller RICOH
Logo RICOH Logo 




Gesamt 29 Seiten
R3117K281C Datasheet, Funktion
R3117x SERIES
LOW VOLTAGE DETECTOR with SENSE pin
NO.EA-186-080617
OUTLINE
The R3117x 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 and a hysteresis circuit. The detector threshold is fixed with high accuracy internally and does
not require any adjustment.
The tolerance of the detector threshold is ±15mV (-VDET <= 1.5V) or ±1.0% (1.5V< -VDET). Since the sense pin is
separated from the VDD pin of the IC, therefore, even if the sense pin voltage becomes to 0V, the output voltage
keeps its "L" level.
Two output types, Nch open drain type and CMOS type are available.
Three types of packages, SOT-23-5, SC-88A, and DFN(PLP)1010-4 are available.
FEATURES
Supply Current ......................................................................Typ. 0.29µA (VDD=6.0V)
Consumption current through SENSE pin is not included.
Range of Operating Voltage..................................................1.0V to 6.0V (-40°C <= Topt <= 105°C)
Detector Threshold Range....................................................Stepwise setting with a step of 0.1V in the range
of 0.7V to 5.0V
Accuracy Detector Threshold................................................±1.0% (-VDET >= 1.6V), ±15mV (-VDET<1.6V)
Temperature-Drift Coefficient of Detector Threshold ............Typ. ±30ppm/°C
Output Types.........................................................................Nch Open Drain and CMOS
Packages ..............................................................................SOT-23-5, DFN(PLP)1010-4, SC-88A
Topt=25°C, unless otherwise noted.
APPLICATIONS
CPU and Logic Circuit Reset
Battery Checker
Window Comparator
Wave Shaping Circuit
Battery Back-up Circuit
Power Failure Detector
1






R3117K281C Datasheet, Funktion
R3117x
ELECTRICAL CHARACTERISTICS BY DETECTOR THRESHOLD
R3117x07xA/C to R3117x50xA/C
Bold values are checked and guaranteed by design engineering at 40°C <= Topt <= 105°C, unless otherwise noted.
Topt=25°C
Part
Number
Detector Threshold
1.0V <= VDD <= 5.25V
-VDET [V]
Detector Threshold
1.0V <= VDD <= 5.25V
-VDET [V]
Detector Threshold
5.25V < VDD <= 6.0V
-VDET [V]
Detector Threshold
5.25V < VDD <= 6.0V
-VDET [V]
Detector Threshold
Hysteresis
VHYS [V]
R3117x07xA/C
R3117x08xA/C
R3117x09xA/C
R3117x10xA/C
R3117x11xA/C
R3117x12xA/C
R3117x13xA/C
R3117x14xA/C
R3117x15xA/C
R3117x16xA/C
R3117x17xA/C
R3117x18xA/C
R3117x19xA/C
R3117x20xA/C
R3117x21xA/C
R3117x22xA/C
R3117x23xA/C
R3117x24xA/C
R3117x25xA/C
R3117x26xA/C
R3117x27xA/C
R3117x28xA/C
R3117x29xA/C
R3117x30xA/C
R3117x31xA/C
R3117x32xA/C
R3117x33xA/C
R3117x34xA/C
R3117x35xA/C
R3117x36xA/C
R3117x37xA/C
R3117x38xA/C
R3117x39xA/C
R3117x40xA/C
R3117x41xA/C
R3117x42xA/C
R3117x43xA/C
R3117x44xA/C
R3117x45xA/C
R3117x46xA/C
R3117x47xA/C
R3117x48xA/C
R3117x49xA/C
R3117x50xA/C
Min.
0.6850
0.7850
0.8850
0.9850
1.0850
1.1850
1.2850
1.3850
1.4850
1.5840
1.6830
1.7820
1.8810
1.9800
2.0790
2.1780
2.2770
2.3760
2.4750
2.5740
2.6730
2.7720
2.8710
2.9700
3.0690
3.1680
3.2670
3.3660
3.4650
3.5640
3.6630
3.7620
3.8610
3.9600
4.0590
4.1580
4.2570
4.3560
4.4550
4.5540
4.6530
4.7520
4.8510
4.9500
Max.
0.7150
0.8150
0.9150
1.0150
1.1150
1.2150
1.3150
1.4150
1.5150
1.6160
1.7170
1.8180
1.9190
2.0200
2.1210
2.2220
2.3230
2.4240
2.5250
2.6260
2.7270
2.8280
2.9290
3.0300
3.1310
3.2320
3.3330
3.4340
3.5350
3.6360
3.7370
3.8380
3.9390
4.0400
4.1410
4.2420
4.3430
4.4440
4.5450
4.6460
4.7470
4.8480
4.9490
5.0500
Min.
0.6700
0.7700
0.8700
0.9700
1.0700
1.1700
1.2700
1.3700
1.4700
1.5680
1.6660
1.7640
1.8620
1.9600
2.0580
2.1560
2.2540
2.3520
2.4500
2.5480
2.6460
2.7440
2.8420
2.9400
3.0380
3.1360
3.2340
3.3320
3.4300
3.5280
3.6260
3.7240
3.8220
3.9200
4.0180
4.1160
4.2140
4.3120
4.4100
4.5080
4.6060
4.7040
4.8020
4.9000
Max.
0.7300
0.8300
0.9300
1.0300
1.1300
1.2300
1.3300
1.4300
1.5300
1.6320
1.7340
1.8360
1.9380
2.0400
2.1420
2.2440
2.3460
2.4480
2.5500
2.6520
2.7540
2.8560
2.9580
3.0600
3.1620
3.2640
3.3660
3.4680
3.5700
3.6720
3.7740
3.8760
3.9780
4.0800
4.1820
4.2840
4.3860
4.4880
4.5900
4.6920
4.7940
4.8960
4.9980
5.1000
Min.
0.6890
0.7890
0.8890
0.9890
1.0890
1.1890
1.2890
1.3890
1.4890
1.5880
1.6872
1.7865
1.8857
1.9850
2.0842
2.1835
2.2827
2.3820
2.4812
2.5805
2.6797
2.7790
2.8782
2.9775
3.0767
3.1760
3.2752
3.3745
3.4737
3.5730
3.6722
3.7715
3.8707
3.9700
4.0692
4.1685
4.2677
4.3670
4.4662
4.5655
4.6647
4.7640
4.8632
4.9625
Max.
0.7240
0.8240
0.9240
1.0240
1.1240
1.2240
1.3240
1.4240
1.5240
1.6256
1.7272
1.8288
1.9304
2.0320
2.1336
2.2352
2.3368
2.4384
2.5400
2.6416
2.7432
2.8448
2.9464
3.0480
3.1496
3.2512
3.3528
3.4544
3.5560
3.6576
3.7592
3.8608
3.9624
4.0640
4.1656
4.2672
4.3688
4.4704
4.5720
4.6736
4.7752
4.8768
4.9784
5.0800
Min.
0.6740
0.7740
0.8740
0.9740
1.0740
1.1740
1.2740
1.3740
1.4740
1.5720
1.6702
1.7685
1.8667
1.9650
2.0632
2.1615
2.2597
2.3580
2.4562
2.5545
2.6527
2.7510
2.8492
2.9475
3.0457
3.1440
3.2422
3.3405
3.4387
3.5370
3.6352
3.7335
3.8317
3.9300
4.0282
4.1265
4.2247
4.3230
4.4212
4.5195
4.6177
4.7160
4.8142
4.9125
Max.
0.7390
0.8390
0.9390
1.0390
1.1390
1.2390
1.3390
1.4390
1.5390
1.6416
1.7442
1.8468
1.9494
2.0520
2.1546
2.2572
2.3598
2.4624
2.5650
2.6676
2.7702
2.8728
2.9754
3.0780
3.1806
3.2832
3.3858
3.4884
3.5910
3.6936
3.7962
3.8988
4.0014
4.1040
4.2066
4.3092
4.4118
4.5144
4.6170
4.7196
4.8222
4.9248
5.0274
5.1300
Min.
0.028
0.032
0.036
0.040
0.044
0.048
0.052
0.056
0.060
0.064
0.068
0.072
0.076
0.080
0.084
0.088
0.092
0.096
0.100
0.104
0.108
0.112
0.116
0.120
0.124
0.128
0.132
0.136
0.140
0.144
0.148
0.152
0.156
0.160
0.164
0.168
0.172
0.176
0.180
0.184
0.188
0.192
0.196
0.200
Max.
0.049
0.056
0.063
0.070
0.077
0.084
0.091
0.098
0.105
0.112
0.119
0.126
0.133
0.140
0.147
0.154
0.161
0.168
0.175
0.182
0.189
0.196
0.203
0.210
0.217
0.224
0.231
0.238
0.245
0.252
0.259
0.266
0.273
0.280
0.287
0.294
0.301
0.308
0.315
0.322
0.329
0.336
0.343
0.350
6

6 Page









R3117K281C pdf, datenblatt
R3117x
Put Equation (3) into Equation (4), then
VS = -VDET × (Ra + Rb) / Rb + Ra × ISENSE
Ra × ISENSE is an error in VS.
Ra × ISENSE = Ra × (-VDET) / RSENSE
= -VDET × Ra / RSENSE
The error range is -VDET × Ra/RSENSE (Fig.3) and to make it small, choosing the low detector threshold voltage
type and set the resistance values Ra, Rb as RSENSE >>Ra. Refer to the electrical characteristics table to see the
RSENSE value.
Vs VDD
Vs
Ra
-VDET
Rb
VDD
SENSE
R3117x
Series
GND
DOUT
Ra
-VDET
Rb
Ia
SENSE
ISENSE
Ib
R3117x
Series
RSENSE
GND
Fig.2
Fig.3
Accuracy Detector Threshold
If the VDD bias voltage is lager than 5.25V, and to keep the detector threshold accuracy level, or if the maximum
operating voltage line must be used as the VDD bias voltage, the input voltage must be set low by using the
divider resistors which are shown in Fig.4.
VB
Vs R1
Ra
-VDET
Rb
SENSE
VDD
R3117x
Series
DOUT
GND
R2
Fig.4
12

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