RT9818 RICHTEK [Richtek Technology Corporation], RT9818 Datasheet

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RT9818

Manufacturer Part Number
RT9818
Description
Micro-Power Voltage Detectors
Manufacturer
RICHTEK [Richtek Technology Corporation]
Datasheet

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Micro-Power Voltage Detectors
General Description
The RT9818 is a micro-power voltage detector
supervising the power supply voltage level for
microprocessors (μP) or digital systems. It provides
internally fixed threshold levels with 0.1V per step ranging
from 1.2V to 5V, which covers most digital applications. It
features low supply current of 3μA. The RT9818 performs
supervisory function by sending out a reset signal
whenever the V
level. This reset signal will last the whole period before
V
threshold level, the reset signal will be released after a
certain delay time. RT9818 is provided in SC-82, SC-70-3,
SOT-23-3, SOT-23-5 and SOT-89 packages.
Ordering Information
DS9818-05 March 2007
RT9818
DD
recovering. Once V
-
DD
voltage falls below a preset threshold
Package Type
U3 : SC-70-3
V : SOT-23-3
VL : SOT-23-3 (L-Type)
B : SOT-23-5
X : SOT-89
Y : SC-82
YR : SC-82 (R-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
Threshold Voltage
12 : 1.2V
13 : 1.3V
49 : 4.9V
50 : 5.0V
Reset Active Timeout Period
A = 0ms
B = 55ms
C = 220ms
D = 450ms
E = 0ms
F = 55ms
G = 220ms
H = 450ms
:
cial Standard)
DD
(RESET)
(RESET)
recovered upcrossing the
(RESET)
(RESET)
(RESET)
(RESET)
(RESET)
(RESET)
Features
Applications
Marking Information
For marking information, contact our sales representative
directly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
Typical Application Circuit
Note :
RichTek Pb-free and Green products are :
Internally Fixed Threshold 1.2V to 5V in 0.1V Step
High Accuracy ± ± ± ± ± 1.5%
Low Supply Current 3μ μ μ μ μ A
No External Components Required
Quick Reset within 20μ μ μ μ μ s
Built-in Recovery Delay Include 0ms, 55ms, 220ms,
450ms Options
Low Functional Supply Voltage 0.9V
N-Channel Open-Drain Output
Small SC-82, SC-70-3, SOT-23-3, SOT-23-5, SOT-89
Packages
RoHS Compliant and 100% Lead (Pb)-Free
Computers
Controllers
Intelligent Instruments
Critical μP and μC Power Monitoring
Portable/Battery-Powered Equipment
RoHS compliant and compatible with the current require-
Suitable for use in SnPb or Pb-free soldering processes.
100%matte tin (Sn) plating.
ments of IPC/JEDEC J-STD-020.
RESET/
RESET
VDD
μP
Pull Up
100k
RESET/
GND
RESET
RT9818
RT9818
VDD
www.richtek.com
1

Related parts for RT9818

RT9818 Summary of contents

Page 1

... It provides internally fixed threshold levels with 0.1V per step ranging from 1.2V to 5V, which covers most digital applications. It features low supply current of 3μA. The RT9818 performs supervisory function by sending out a reset signal whenever the V voltage falls below a preset threshold DD level ...

Page 2

... RT9818 Pin Configurations RESET/ GND NC RESET RESET/ VDD VDD RESET SC-82 SC-82 (R-Type VDD GND RESET/ RESET/ RESET RESET SOT-23-5 Functional Pin Description Pin Name Pin Function GND Ground RESET Active Low Open-Drain Reset Output RESET Active High Open-Drain Reset Output ...

Page 3

... T = 27° Drop = V -125mV RD TH ≥ 1.02× < >3.5mA SINK V HYS RT9818 − 0.3V to 6.0V − 0. − 65°C to 125°C − 40°C to 125°C − 40°C to 85°C Min Typ Max 0 27° 1.2 to 5.0 −1.5 -- +1.5 -- ...

Page 4

... RT9818 Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability ...

Page 5

... RT9818 Nch Driver Output Current vs RT9818C- 1. 0 (V) DS Output Voltage vs. Input Voltage 7 RT9818 1. Input Volgate (V) Supply Current vs. Input Voltage 4 RT9818C-30 3.5 3 2.5 2 -30°C 1 Input Voltage (V) ...

Page 6

... Temperature Power-Down Reset Delay vs. Temperature 45 RT9818A- 200mV DROP -50 - Temperature Nch Driver Sink Current vs. Input Voltage 40 RT9818C-30 0. 25° 0.5 1 1.5 2 Input Voltage(V) DS9818-05 March 2007 V = 150mV DROP V = 250mV DROP 75 100 125 (° ...

Page 7

... Nch Driver Sink Current vs. Input Voltage 50 RT9818A-45 0. Input Voltage(V) Power-Up Reset Time-Out vs. Temperature 100 RT9818A -50 - Temperature Nch Driver Output Current vs. V 160 RT9818G-31 140 120 100 DS9818-05 March 2007 -30° ...

Page 8

... Power-Down Reset Time-Out vs. Temperature 30 RT9818G- 200mV DROP -50 - Temperature www.richtek.com 100 125 (° 150mV DROP V = 250mV DROP 50 75 100 125 (°C) Output Voltage vs. Input Voltage 7 RT9818G- Input Voltage (V) DS9818-05 March 2007 5 6 ...

Page 9

... Application Information Multiple Supplies Mainly, the pull-up connected to the RT9818 will connect to the supply voltage that is being monitored at the IC’ s pin. However, some systems may use the open-drain output to level-shift from the monitored supply to reset circuitry powered by some other supply. Benefits of Highly Accurate Reset Threshold Most μ ...

Page 10

... RT9818 Outline Dimension Symbol www.richtek.com Dimensions In Millimeters Min Max 0.800 1.100 0.000 0.100 1.150 1.350 0.150 0.400 1.800 2.450 1.800 2.250 1.300 0.080 0.260 0.210 0.460 SC-70-3 Surface Mount Package H L Dimensions In Inches Min Max 0 ...

Page 11

... SC-82 Surface Mount Package RT9818 H L Dimensions In Inches Min Max 0.031 0.043 0.000 0.004 0.045 0.053 0.006 0.016 0.014 0.020 0.071 0.096 0.071 0.087 ...

Page 12

... RT9818 Symbol www.richtek.com Dimensions In Millimeters Min Max 0.889 1.295 0.000 0.152 1.397 1.803 0.356 0.508 2.591 2.997 2.692 3.099 1.803 2.007 0.080 0.254 0.300 0.610 SOT-23-3 Surface Mount Package H L Dimensions In Inches Min Max 0 ...

Page 13

... SOT-23-5 Surface Mount Package RT9818 H L Dimensions In Inches Min Max 0.035 0.051 0.000 0.006 0.055 0.071 0.014 0.022 0.102 0.118 0.106 0.122 0.033 ...

Page 14

... RT9818 Symbol Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 www.richtek.com Dimensions In Millimeters Min Max 1.397 1.600 0.356 0.483 2.388 2.591 0.406 0.533 3 ...

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