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RT9828 の電気的特性と機能

RT9828のメーカーはRichtek Technology Corporationです、この部品の機能は「Dual Micro-Power Voltage Detectors」です。


製品の詳細 ( Datasheet PDF )

部品番号 RT9828
部品説明 Dual Micro-Power Voltage Detectors
メーカ Richtek Technology Corporation
ロゴ Richtek Technology Corporation ロゴ 




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RT9828 Datasheet, RT9828 PDF,ピン配置, 機能
RT9828
Dual Micro-Power Voltage Detectors
General Description
The RT9828 is a micro-power voltage detector supervising
the power supply voltage level for microprocessors (uP) or
digital systems. It provides internally fixed threshold levels
ranging from 1.2V to 5V, which covers most digital
applications. It features low supply current of 6uA. The
RT9828 performs supervisory function by sending out a
reset signal whenever the VDD voltage falls below a preset
threshold level. This reset signal will last the whole period
before VDD recovering. Once the VDD exceeds the threshold
level, the reset signal will be released after a certain delay
time. The RT9828 is available in SOT-23-6 package.
Ordering Information
RT9828-
Package Type
E : SOT-23-6
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Note :
Threshold Voltage : RESET1/RESET2
WP : 1.6V/3.0V
GP : 1.8V/3.0V
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Features
z High Accuracy ±1.5%
z Low Supply Current 6uA
z Quick Reset within 20us
z Built-in 55ms Recovery Delay
z Low Functional Supply Voltage 0.9V
z Dual N-Channel Open-Drain Output
z Small SOT-23-6 Packages
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Computers
z Controllers
z Intelligent Instruments
z Critical uP and uC Power Monitoring
z Portable/Battery-Powered Equipment
Pin Configurations
(TOP VIEW)
RESET1 GND VDD2
654
23
VDD1 NC RESET2
SOT-23-6
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
DS9828-02 April 2011
Downloaded from Elcodis.com electronic components distributor
www.richtek.com
1

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RT9828 pdf, ピン配列
RT9828
Absolute Maximum Ratings (Note 1)
z Input Voltage (with Respect to GND)
VDD1/VDD2 --------------------------------------------------------------------------------------------------------------- 0.3V to 6V
z All Other Inputs -------------------------------------------------------------------------------------------------------- 0.3V to VDD + 0.3V
z Input Current, IDD1/IDD2 ----------------------------------------------------------------------------------------------- 20mA
z Power Dissipation, PD @ TA = 25°C
SOT-23-6 ---------------------------------------------------------------------------------------------------------------- 0.4W
z Package Thermal Resistance (Note 2)
SOT-23-6, θJA ----------------------------------------------------------------------------------------------------------- 250°C/W
z Lead Temperature (Soldering, 10sec.) ---------------------------------------------------------------------------- 260°C
z Junction Temperature ------------------------------------------------------------------------------------------------- 150°C
z Storage Temperature Range ---------------------------------------------------------------------------------------- 65°C to 150°C
z ESD Susceptibility (Note 3)
HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV
MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 4)
z Junction Temperature Range ---------------------------------------------------------------------------------------- 40°C to 125°C
z Ambient Temperature Range ---------------------------------------------------------------------------------------- 40°C to 85°C
Electrical Characteristics
(VDD = 3V, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Input Voltage
VDD1 / VDD2
Supply Current
IVDD1 / IVDD2 VTH = 3V, VDD = 4.5V
Threshold Voltage Accuracy ΔVTH
VDD Drop to Reset Delay
tRD
Drop = VTH 125mV
Reset Active Time Out Period tRP
VDD 1.02 × VTH
RESET Output Voltage Low VOL
Hysteresis Width
VHYS
1.6 = VDD < VTH, ISINK > 3.5mA
Min Typ Max Units
0.9 --
6V
-- 6 16 uA
1.5 -- +1.5 %
-- 20 -- us
-- 55 -- ms
-- -- 0.4 V
-- 0.01VTH --
V
Note 1. Stresses listed as the above Absolute Maximum Ratingsmay 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.
Note 2. θJA is measured in the natural convection at TA = 25°C on a low effective single layer thermal conductivity test board
of JEDEC 51-3 thermal measurement standard.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
DS9828-02 April 2011
Downloaded from Elcodis.com electronic components distributor
www.richtek.com
3


3Pages


RT9828 電子部品, 半導体
RT9828
Application Information
The RT9828 voltage detector monitors the input voltage fo
generate a reset signal while the input voltage is lower
then the detecting threshold voltage level.
The RESET pin is an open drain output. It is recommended
to connect a pull-up resister between RESET pin and VIN.
Figure 1 shows the timming diagram of VDD and RESET
signals. When VDD is lower than VTH, the RESET goes
low after a short delay time tRD. When VDD is higher than
VTH with a hystersis (VHYS), the RESET will be pulled up
after the delay time tRP. The typical value of the delay time
tRD and tRP are showed in specification.
VDD
VTH + VHYS
VTH
Minimum operation voltage
RESET
tRP
tRD
Figure 1. Timming Diagram
Thermal Considerations
For continuous operation, do not exceed absolute
maximum operation junction temperature. The maximum
power dissipation depends on the thermal resistance of IC
package, PCB layout, the rate of surroundings airflow and
temperature difference between junction to ambient. The
maximum power dissipation can be calculated by following
formula :
PD(MAX) = ( TJ(MAX) TA ) / θJA
Where TJ(MAX) is the maximum operation junction
temperature 125°C, TA is the ambient temperature and the
θJA is the junction to ambient thermal resistance.
For recommended operating conditions specification of
RT9828, where TJ(MAX) is the maximum junction
temperature of the die (125°C) and TA is the maximum
ambient temperature. The junction to ambient thermal
resistance θJA is layout dependent. For SOT-23-6
www.richtek.com
6
packages, the thermal resistance θJA is 250°C/W on the
standard JEDEC 51-3 single layer thermal test board. The
maximum power dissipation at TA= 25°C can be calculated
by following formula :
PD(MAX) = (125°C 25°C) / (250°C/W) = 0.400W for
SOT-23-6 packages
The maximum power dissipation depends on operating
ambient temperature for fixed TJ(MAX) and thermal resistance
θJA. For RT9828 packages, the Figure 2 of derating curves
allows the designer to see the effect of rising ambient
temperature on the maximum power allowed.
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
0
Single Layer PCB
SOT-23-6
25 50 75 100
Ambient Temperature (°C)
125
Figure 2. Derating Curves for RT9828 Packages
DS9828-02 April 2011
Downloaded from Elcodis.com electronic components distributor

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部品番号部品説明メーカ
RT9828

Dual Micro-Power Voltage Detectors

Richtek Technology Corporation
Richtek Technology Corporation


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