SSR809N SMC | Alldatasheet
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Technical Data 3-Pin Microprocessor Reset Circuits Data Sheet N1589 Rev. -
- China - Germany - Korea - Singapore - United States •
- http://www.smc-diodes.com - sales@ smc-diodes.com • SSR809N SSR809P/SSR810P Description: SSR809P/SSR810P are low-power microprocessor ( μP) supervisory circuits used to monitor power supplies in μP and digital systems. They provide applications with benefits of circuit reliability and low cost by eliminating external components. These devices perform as valid signals in applications with Vcc ranging from 6.0V down to 0.9V. The reset signal lasts for a minimum period of 140ms whenever VCC supply voltage falls below preset threshold. Both SSR809P and SSR810P were designed with a reset comparator to help identify invalid signals, which last less than 140ms. The only difference between them is that they have an active-low RESET output and active-high RESET output, respectively. Low supply current (1 μA) makes SSR809P/SSR810P ideal for portable equipment. The devices are available in SOT-23 package. Features:
- Ultra Low Supply Current 1μA(typ.)
- Guaranteed Reset Valid to Vcc=0.9V
- Available in Three Output Type: Open-Drain Active Low (SSR809N), Push-Pull Active Low (SSR809P), Push-Pull Active High (SSR810P)
- 140ms Min. Power-On Reset Pulse Width
- Tight Voltage Threshold Tolerance: 1.5%
- Tiny Package in SOT-23 Applications:
- Notebook Computers
- Digital Still Cameras
- PDAs
- Critical Microprocessor Monitoring Typical application circuit:
Technical Data 3-Pin Microprocessor Reset Circuits Data Sheet N1589 Rev. -
- China - Germany - Korea - Singapore - United States •
- http://www.smc-diodes.com - sales@ smc-diodes.com • SSR809N SSR809P/SSR810P Ordering Information: SSR809X -XXXXX SSR810X -XXXXX Marking Diagram: PIN CONFIGURATION SOT-23 TOP VIEW 1: GND 2: RESET (RESET) 3: VCC SOT-23 TOP VIEW 1: RESET (RESET) 2: GND 3: VCC Part No. Marking Part No. Marking Part No. Marking SSR809P-23FTR RA23G SSR810P-23FTR RD23G SSR809N-23FTR RB23G SSR809P-26FTR RA26G SSR810P-26FTR RD26G SSR809N-26FTR RB26G SSR809P-29FTR RA29G SSR810P-29FTR RD29G SSR809N-29FTR RB29G SSR809P-31FTR RA31G SSR810P-31FTR RD31G SSR809N-31FTR RB31G SSR809P-40FTR RA40G SSR810P-40FTR RD40G SSR809N-40FTR RB40G SSR809P-44FTR RA44G SSR810P-44FTR RD44G SSR809N-44FTR RB44G SSR809P-46FTR RA46G SSR810P-46FTR RD46G SSR809N-46FTR RB46G PACKING TYPE TB: TUBE TR: TAPING & REEL PACKAGING TYPE F: SOT-2 RESET THRESHOLD VOLTAGE 23: 2.3V 26: 2.6V 29: 2.9V 31: 3.1V 40: 4.0V 42: 4.2V 44: 4.4V 46: 4.6V OUTPUT TYPE P: Push-Pull type N: N-ch Open-Drain type
Technical Data 3-Pin Microprocessor Reset Circuits Data Sheet N1589 Rev. -
- China - Germany - Korea - Singapore - United States •
- http://www.smc-diodes.com - sales@ smc-diodes.com • SSR809N SSR809P/SSR810P Absolute Maximum Ratings: RESET, R ESE T Output Current (RESET or R E SET Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Test Circuit
Technical Data 3-Pin Microprocessor Reset Circuits Data Sheet N1589 Rev. -
- China - Germany - Korea - Singapore - United States •
- http://www.smc-diodes.com - sales@ smc-diodes.com • SSR809N SSR809P/SSR810P Electrical Characteristics (Typical values are at TA=25°C, unless otherwise specified.) (Note 1) Note: 1. Specifications are production tested at TA=25°C. Specifications over the -40°C to 85°C operating temperature range are assured by design, characterization and correlation with Statistical Quality Controls (SQC). 2. RESET output is for SSR809P; RESET output is for SSR810P.
Technical Data 3-Pin Microprocessor Reset Circuits Data Sheet N1589 Rev. -
- China - Germany - Korea - Singapore - United States •
- http://www.smc-diodes.com - sales@ smc-diodes.com • SSR809N SSR809P/SSR810P Typical Performance Characteristics
Technical Data 3-Pin Microprocessor Reset Circuits Data Sheet N1589 Rev. -
- China - Germany - Korea - Singapore - United States •
- http://www.smc-diodes.com - sales@ smc-diodes.com • SSR809N SSR809P/SSR810P Block Diagram
Technical Data 3-Pin Microprocessor Reset Circuits Data Sheet N1589 Rev. -
- China - Germany - Korea - Singapore - United States •
- http://www.smc-diodes.com - sales@ smc-diodes.com • SSR809N SSR809P/SSR810P Pin Descriptions GND Pin : Ground. RESET Pin (SSR809P) : Active low output pin. RESET Output remains low while Vcc is below the reset threshold. RESET Pin (SSR810P) : Active high output pin. RESET output remains high while Vcc is below the reset threshold. Vcc Pin : Supply voltage. Detail Descriptions of Technical Terms RESET OUTPUT μP will be activated at a valid reset state. These μP supervisory circuits assert reset to prevent code execution errors during power-up, power-down, or brownout conditions. RESET is guaranteed to be a logic low for V TH >VCC>0.9V. Once VCC exceeds the reset threshold, an internal timer keeps RESET low for the reset timeout period; after this interval, RESET goes high. If a brownout condition occurs (VCC drops below the reset threshold), RESET goes low. Any time VCC goes below the reset threshold, the internal timer resets to zero, and RESET goes low. The internal timer is activated after VCC returns above the reset threshold, and RESET remains low for the reset timeout period. BENEFITS OF HIGHLY ACCURATE RESET THRESHOLD SSR809P/SSR810P with specified voltage as 5V±10% or 3V±10% are ideal for systems using a 5V±5% or 3V±5% power supply. The reset is guaranteed to assert after the power supply falls out of regulation, but before power drops below the minimum specified operating voltage range of the system ICs. The pre-trimmed thresholds are reducing the range over which an undesirable reset may occur.
Technical Data 3-Pin Microprocessor Reset Circuits Data Sheet N1589 Rev. -
- China - Germany - Korea - Singapore - United States •
- http://www.smc-diodes.com - sales@ smc-diodes.com • SSR809N SSR809P/SSR810P
Application Information
NEGATIVE-GOING VCC TRANSIENTS In addition to issuing a reset to the μP during power-up, power-down, and brownout conditions, SSR809P series are relatively resistant to short-duration negative-going VCC transient. ENSURING A VALID RESET OUTPUT DOWN TO VCC=0 When VCC falls below 0.9V, SSR809P RESET output no longer sinks current; it becomes an open circuit. In this case, high-impedance CMOS logic inputs connecting to RESET can drift to undetermined voltages. Therefore, SSR809P/SSR810P with CMOS is perfect for most applications of VCC below 0.9V. However in applications where RESET must be valid down to 0V, adding pull-down resistor to RESET causes any leakage currents to flow to ground, holding RESET low. INTERFACING TO μP WITH BIDIRECTIONAL RESET PINS The RESET output on the SSR809N is open drain, this device interfaces easily with μPs that have bidirectional reset pins. Connecting the μP supervisor’s RESET output directly to the microcontroller’s RESET pin with a single pull-resistor allows either device to assert reset. Application Circuit
Technical Data 3-Pin Microprocessor Reset Circuits Data Sheet N1589 Rev. -
- China - Germany - Korea - Singapore - United States •
- http://www.smc-diodes.com - sales@ smc-diodes.com • SSR809N SSR809P/SSR810P Physical Dimensions SOT-23 (unit: mm) Note: 1. Refer to JEDEC MO-178. 2. Dimension D and E1 do not include mold flash, protrusions or gate burrs. Mold flash, protrusion or gate burrs shall not exceed 10 mil per side. 3. Controlling dimension is millimeter, converted inch dimensions are not necessarily exact.
Technical Data 3-Pin Microprocessor Reset Circuits Data Sheet N1589 Rev. -
- China - Germany - Korea - Singapore - United States •
- http://www.smc-diodes.com - sales@ smc-diodes.com • SSR809N SSR809P/SSR810P DISCLAIMER: 1- The information given herein, including the specifications and dimensions, is subject to change without prior notice to improve product characteristics. Before ordering, purchasers are advised to contact the SMC - Sangdest Microelectronics (Nanjing) Co., Ltd sales department for the latest version of the datasheet(s). 2- In cases where extremely high reliability is required (such as use in nuclear power control, aerospace and aviation, traffic equipment, medical equipment , and safety equipment) , safety should be ensured by using semiconductor devices that feature assured safety or by means of users’ fail-safe precautions or other arrangement . 3- In no event shall SMC - Sangdest Microelectronics (Nanjing) Co., Ltd be liable for any damages that may result from an accident or any other cause during operation of the user’s units according to the datasheet(s). SMC - Sangdest Microelectronics (Nanjing) Co., Ltd assumes no responsibility for any intellectual property claims or any other problems that may result from applications of information, products or circuits described in the datasheets. 4- In no event shall SMC - Sangdest Microelectronics (Nanjing) Co., Ltd be liable for any failure in a semiconductor device or any secondary damage resulting from use at a value exceeding the absolute maximum rating. 5- No license is granted by the datasheet(s) under any patents or other rights of any third party or SMC - Sangdest Microelectronics (Nanjing) Co., Ltd. 6- The datasheet(s) may not be reproduced or duplicated, in any form, in whole or part, without the expressed written permission of SMC - Sangdest Microelectronics (Nanjing) Co., Ltd. 7- The products (technologies) described in the datasheet(s) are not to be provided to any party whose purpose in their application will hinder maintenance of international peace and safety nor are they to be applied to that purpose by their direct purchasers or any third party. When exporting these products (technologies), the necessary procedures are to be taken in accordance with related laws and regulations..