SSR809N SSR809P/SSR810P Technical Data Data Sheet N1589 Rev. - 3-Pin Microprocessor Reset Circuits 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 ———————— R E S E T output and active-high RESET output, respectively. Low supply current (1μA) 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 Internally Fixed Threshold 2.3V, 2.6V, 2.9V, 3.1V, 4.0V, 4.2V, 4.4V, 4.6V Tight Voltage Threshold Tolerance: 1.5% Tiny Package in SOT-23 Applications: • • • • Notebook Computers Digital Still Cameras PDAs Critical Microprocessor Monitoring Typical application circuit: • China - Germany - Korea - Singapore - United States • • http://www.smc-diodes.com - sales@ smc-diodes.com • SSR809N SSR809P/SSR810P 3-Pin Microprocessor Reset Circuits Technical Data Data Sheet N1589 Rev. - Ordering Information: PIN CONFIGURATION SSR809X -XXXXX SSR810X -XXXXX SOT-23 PACKING TYPE TB: TUBE TR: TAPING & REEL TOP VIEW 1: GND ———————— 2: R E S E T (RESET) 3: VCC PACKAGING TYPE F: SOT-23 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 SOT-23 TOP VIEW ———————— 1: R E S E T (RESET) 2: GND 3: VCC OUTPUT TYPE P: Push-Pull type N: N-ch Open-Drain type Marking Diagram: Part No. Marking Part No. Marking Part No. Marking SSR809P-23FTR SSR809P-26FTR SSR809P-29FTR SSR809P-31FTR SSR809P-40FTR SSR809P-44FTR SSR809P-46FTR RA23G RA26G RA29G RA31G RA40G RA44G RA46G SSR810P-23FTR SSR810P-26FTR SSR810P-29FTR SSR810P-31FTR SSR810P-40FTR SSR810P-44FTR SSR810P-46FTR RD23G RD26G RD29G RD31G RD40G RD44G RD46G SSR809N-23FTR SSR809N-26FTR SSR809N-29FTR SSR809N-31FTR SSR809N-40FTR SSR809N-44FTR SSR809N-46FTR RB23G RB26G RB29G RB31G RB40G RB44G RB46G • China - Germany - Korea - Singapore - United States • • http://www.smc-diodes.com - sales@ smc-diodes.com • SSR809N SSR809P/SSR810P 3-Pin Microprocessor Reset Circuits Technical Data Data Sheet N1589 Rev. - Absolute Maximum Ratings: VCC ………..................…………………………………………………………………………….-0.3V~6.5V ———————— RESET, R E S E T ………………………...............……………………………………-0.3V ~ (VCC+0.3V) Input Current (VCC)…………………………………………………………………..................…... 20mA ———————— Output Current (RESET or R E S E T )………………………...............……………………………20mA Continuous Power Dissipation (TA = +70°C) ...……………………………………………….. 320mW Operating Junction Temperature Range ...………………………………………….… –40°C to 85°C Junction Temperature ………………………………………………………………………………..125°C Storage Temperature Range ……………………………………………………………..–65°C ~ 150°C Lead Temperature (Soldering) 10 sec. ……………………………………………………………260°C Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Test Circuit • China - Germany - Korea - Singapore - United States • • http://www.smc-diodes.com - sales@ smc-diodes.com • SSR809N SSR809P/SSR810P Technical Data Data Sheet N1589 Rev. - 3-Pin Microprocessor Reset Circuits 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. R E S E T output is for SSR809P; RESET output is for SSR810P. • China - Germany - Korea - Singapore - United States • • http://www.smc-diodes.com - sales@ smc-diodes.com • SSR809N SSR809P/SSR810P Technical Data Data Sheet N1589 Rev. - 3-Pin Microprocessor Reset Circuits Typical Performance Characteristics • China - Germany - Korea - Singapore - United States • • http://www.smc-diodes.com - sales@ smc-diodes.com • SSR809N SSR809P/SSR810P Technical Data Data Sheet N1589 Rev. - 3-Pin Microprocessor Reset Circuits Block Diagram • China - Germany - Korea - Singapore - United States • • http://www.smc-diodes.com - sales@ smc-diodes.com • SSR809N SSR809P/SSR810P 3-Pin Microprocessor Reset Circuits Technical Data Data Sheet N1589 Rev. - 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 >VCC>0.9V. Once VCC exceeds the reset threshold, an ——————— TH ——————— 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. • China - Germany - Korea - Singapore - United States • • http://www.smc-diodes.com - sales@ smc-diodes.com • SSR809N SSR809P/SSR810P 3-Pin Microprocessor Reset Circuits Technical Data Data Sheet N1589 Rev. - 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 • China - Germany - Korea - Singapore - United States • • http://www.smc-diodes.com - sales@ smc-diodes.com • SSR809N SSR809P/SSR810P Technical Data Data Sheet N1589 Rev. - 3-Pin Microprocessor Reset Circuits 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. • China - Germany - Korea - Singapore - United States • • http://www.smc-diodes.com - sales@ smc-diodes.com • SSR809N SSR809P/SSR810P Technical Data Data Sheet N1589 Rev. - 3-Pin Microprocessor Reset Circuits 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). 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