RICHTEK RT9817B-XXPH Micro Power Voltage Detectors with Manual Reset User Manual

Micro-Power Voltage Detectors with Manual Reset

General Description

The RT9817 is a micro-power voltage detector with deglitched manual reset input 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 RT9817 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 VDD recovered upcrossing the threshold level, the  reset signal will be released after a certain delay time. To pull reset signal low manually, just pull the manual reset input (MR) below the specified VIL level. RT9817 is provided in SC-82 and SOT-143 packages.

Ordering Information

Note :
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

• Internally Fixed Threshold 1.2V to 5V in 0.1V Step
• High Accuracy ±±±±±1.5%
• Low Supply Current 3μμμμμA
• No External Components Required
• Quick Reset within 20μμμμμs
• Built-in Recovery Delay Include 0ms, 55ms, 220ms, 450ms Options
• Low Functional Supply Voltage 0.9V
• CMOS Push-Pull Output
• Small SC-82 and SOT-143 Packages
• RoHS Compliant and 100% Lead (Pb)-Free

Applications

• Computers
• Controllers
• Intelligent Instruments
• Critical μP and μC Power Monitoring
• Portable/Battery-Powered Equipment

Pin Configuration

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.

Part Status

Par t No.| S t atus| Pa ckage Type| L e ad Plating System
---|---|---|---
RT9817B-XXPH| EOL| SOT-143| Pb Free
RT9817B-XXPY| EOL| SC-82| Pb Free
RT9817C-XXPH| EOL| SOT-143| Pb Free
RT9817C-XXGH| Lifebuy| SOT-143| G : Green (Halogen Free and Pb Free)
RT9817D-XXPH| EOL| SOT-143| Pb Free

The part status values are defined as below :
Preview : Device has been announced but is not in production.
Active : Device is in production and is recommended for new designs.
Lifebuy : The device will be discontinued, and a lifetime -buy period is in effect.
NRND : Not recommended for new designs.
EOL : Richtek has discontinued the production of the device.

Typical Application Circuit

Functional Pin Description

Functional Block Diagram

Absolute Maximum Ratings (Note 1)

• Terminal Voltage (with Respect to GND)
  VDD ———————————————- −0.3V to 6.0V

• All Other Inputs ———————————————– −0.3V to VDD+0.3V

• Input Current, IVDD ——————————————– 20mA

• Power Dissipation, PD @ TA = 25°C
  SC-82 ——————————————— 0.25W
  SOT-143 ——————————————— 0.285W

• Package Thermal Resistance (Note 2)
  SC-82, θJA ——————————————– 400°C
  SOT-143, θJA ——————————————– 350°C

• Lead Temperature (Soldering, 10sec.) ——————————————– 260°C

• Storage Temperature Range ——————————————– −65°C to 125°C

• ESD Susceptibility (Note 3)
  HBM (Human Body Mode) ——————————————– 2kV
  MM (Machine Mode) ——————————————– 200V

Recommended Operating Conditions (Note 4)

• Junction Temperature Range —————————————– −40°C to 125°C
• Ambient Temperature Range —————————————– −40°C to 85°C

Electrical Characteristics
(VDD = 3V, TA = 25°C, unless otherwise specified)

Parameter| Symbol| Test Conditions| Min| Typ| Max| Unit
---|---|---|---|---|---|---
Operating VDD (VOUT) Range| VDD| RT9817A/B/C/D| 0.9| —| 6| V
RT9817E/F/G/H| 1.1| —| 6
Supply Current| IDD| VTH = 3V, VDD = 4.5V| —| 3| 8| μA
Reset Threshold| VTH| | —| 1.2 to 5.0| —| V
Threshold Voltage Accuracy| ΔVTH| | −1.5| —| +1.5| %
Threshold Voltage Hysteresis| VHYS| | —| 0.01 VTH| —| V
VDD Drop to Reset Delay| tRD| Drop = VTH − 125mV| —| 20| —| μs
Reset Active Time Out Period| RT9817A/E| tRP| VDD ≥ 1.02 × VTH| —| 0| —| ms
RT9817B/F| 35| 55| 75| ms
RT9817C/G| 143| 220| 297| ms
RT9817D/H| 292| 450| 608| ms
RESET Output Voltage Low| VOL| VDD < VTH(MIN) ,ISINK =  3.5mA, VTH ≥ 3V| —| —| 0.4| V
VDD < VTH(MIN) ,ISINK = 1.2mA, VTH ≥ 1.8V| —| —| 0.3
VTH(MIN) > VDD > 1V,  SINK  = 0.5mA| —| —| 0.3|
Parameter| Symbol| Test Conditions| Min| Typ| Max| Unit
---|---|---|---|---|---|---
RESET Output Voltage High| V| VDD > VTH(MAX) , ISOURCE = 800μA, VTH ≥ 3V| VDD −1.5| —| —| V
VDD > VTH(MAX) , ISOURCE = 500μA, VTH  ≥ 1.8V| 0.8 VDD| —| —
VDD > VTH(MAX) , ISOURCE = 200μA, VTH  ≥ 1.1V| 0.8 VDD| —| —
RESET Output Voltage Low| V| VDD > VTH(MAX) ,ISINK = 3.5mA, VTH ≥ 3V| —| —| 0.4| V
VDD > VTH(MAX) ,ISINK = 1.2mA, VTH ≥ 1.8V| —| —| 0.3
VDD > VTH(MAX) ,ISINK = 0.5mA, VTH ≥  1.2V| —| —| 0.3
RESET Output Voltage High| VOH| 1.1V < VDD < VTH (MIN) , ISOURCE = 200μA| 0.8 VDD| —| —| V
1.8V < VDD < VTH (MIN) , ISOURCE =  500μA| 0.8 VDD| —| —
3V < VDD < VTH(MIN) , ISOURCE = 800μA| VDD −1.5| —| —

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.
Note 2. θJA is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard.
Note 3. Devices are ESD sensitive. Handling precautions are recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.

Typical Operating Characteristics

Application Information

Benefits of Highly Accurate Reset Threshold
Most μP supervisor ICs have reset threshold voltages between 1% and 1.5% below the value of nominal supply voltages.
This ensures a reset will not occur within 1% of the nominal supply, but will occur when the supply is 1.5% below nominal.

Outline Dimension

SOT-143 Surface Mount Package

Richtek Technology Corporation
Headquarter
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Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611| Richtek Technology Corporation
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Taipei County, Taiwan, R.O.C.
Tel: (8862)86672399 Fax: (8862)86672377
Email: marketing@richtek.com
---|---

Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. No third party  intellectual property infringement of the applications should be guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek.

Datasheet Revision History

www.richtek.com
DS9817-14 June 2023

References

• Richtek Technology

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