AIC809/AIC810 3-Pin Microprocessor Reset Circuits FEATURES DESCRIPTION Ultra Low Supply Current 1µA(typ.) AIC809/AIC810 are low-power microprocessor (µP) Guaranteed Reset Valid to Vcc=0.9V supervisory circuits used to monitor power supplies in Available in Three Output Type: Open-Drain µP and digital systems. They provide applications with Active Low (AIC809N), Push-Pull Active Low benefits of circuit reliability and low cost by eliminating (AIC809), Push-Pull Active High (AIC810) external components. 140ms Min. Power-On Reset Pulse Width Internally Fixed Threshold 2.3V, 2.6V, 2.9V, 3.1V, 4.0V, 4.4V, 4.6V These devices perform as valid singles in applications Tight Voltage Threshold Tolerance: 1.5% with Vcc ranging from 6.0V down to 0.9V. The reset Tiny Package in SOT-23 signal lasts for a minimum period of 140ms whenever VCC supply voltage falls below preset threshold. Both APPLICATIONS AIC809 and AIC810 were designed with a reset Notebook Computers comparator to help identify invalid signals, which last Digital Still Cameras less than 140ms. The only difference between them is PDAs that they have an active-low RESET output and Critical Microprocessor Monitoring active-high RESET output, respectively. Low supply current (1µA) makes AIC809/AIC810 ideal for portable equipment. The devices are available in SOT-23 package. TYPICAL APPLICATION CIRCUIT VCC VCC VCC AIC809 (AIC810) RESET (RESET) µP RESET INPUT GND GND Push-Pull Output Analog Integrations Corporation Si-Soft Research Center DS-809P-02 010405 3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C. TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw 1 AIC809/AIC810 ORDERING INFORMATION AIC809X-XXXXXX AIC810 -XXXXXX PIN CONFIGURATION SOT-23 TOP VIEW 1: GND 2: RESET (RESET) 3: VCC PACKING TYPE TR: TAPE & REEL BG: BAG 3 1 2 PACKAGE TYPE U: SOT-23 C: COMMERCIAL P: LEAD FREE COMMERCIAL RESET THRESHOLD VOLTAGE 23: 2.3V 26: 2.6V 29: 2.9V 31: 3.1V 40: 4.0V 44: 4.4V 46: 4.6V OUTPUT TYPE DEFAULT: Push-Pull type N: N-ch Open-Drain type (Additional voltage versions with a unit of 0.1V within the voltage range from 1.5V to 5.5V for this product line may be available on demand with prior consultation with AIC.) Example: AIC809-31-CUTR 3.1V and push-pull version, in SOT-23 Package & Tape & Reel Packing Type AIC809-31-PUTR 3.1V and push-pull version, in Lead Free SOT-23 Package & Tape & Reel Packing Type SOT-23 Marking Part No. Marking Part No. Marking Part No. Marking AIC809-23CU RA23 AIC809N23CU RB23 AIC810-23CU RD23 AIC809-26CU RA26 AIC809N26CU RB26 AIC810-26CU RD26 AIC809-29CU RA29 AIC809N29CU RB29 AIC810-29CU RD29 AIC809-31CU RA31 AIC809N31CU RB31 AIC810-31CU RD31 AIC809-40CU RA40 AIC809N40CU RB40 AIC810-40CU RD40 AIC809-44CU RA44 AIC809N44CU RB44 AIC810-44CU RD44 AIC809-46CU RA46 AIC809N46CU RB46 AIC810-46CU RD46 2 AIC809/AIC810 Part No. Marking Part No. Marking Part No. Marking AIC809-23PU RA23P AIC809N23PU RB23P AIC810-23PU RD23P AIC809-26PU RA26P AIC809N26PU RB26P AIC810-26PU RD26P AIC809-29PU RA29P AIC809N29PU RB29P AIC810-29PU RD29P AIC809-31PU RA31P AIC809N31PU RB31P AIC810-31PU RD31P AIC809-40PU RA40P AIC809N40PU RB40P AIC810-40PU RD40P AIC809-44PU RA44P AIC809N44PU RB44P AIC810-44PU RD44P AIC809-46PU RA46P AIC809N46PU RB46P AIC810-46PU RD46P ABSOLUTE MAXIMUM RATINGS VCC -0.3V ~6.5V RESET, RESET -0.3V ~ (VCC+0.3V) Input Current (VCC) 20mA Output Current (RESET or RESET ) 20mA Continuous Power Dissipation (TA = +70°C) 320mW Operating Junction Temperature Range -40°C ~ 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 A IC 8 0 9 V IN I IN VCC RESET GND 3 AIC809/AIC810 ELECTRICAL CHARACTERISTICS (Typical values are at TA=25°C, unless otherwise specified.) (Note 1) PARAMETER SYMBOL Operating Voltage Range VCC Supply Current ICC TEST CONDITIONS VCC = VTH +0.1V AIC809-26 AIC809-29 VTH AIC809-31 AIC809-40 AIC809-44 AIC809-46 TA=+25°C 2.254 TA=+25°C 2.561 TA= -40°C to +85°C 2.548 TA=+25°C 2.857 TA= -40°C to +85°C 2.842 TA=+25°C 3.054 TA= -40°C to +85°C 3.038 TA=+25°C 3.940 TA= -40°C to +85°C 3.920 TA=+25°C 4.334 TA= -40°C to +85°C 4.312 TA=+25°C 4.531 TA=-40°C to +85°C 4.508 TRD VCC=VTH to (VTH -0.1V), VTH=3.1V Reset Active Timeout Period TRP VCC = VTH (MAX) VOH VCC=VTH+0.1V, ISOURCE=1mA VOL VCC=VTH - 0.1V, ISINK=1mA VOH VCC=VTH-0.1V, ISOURCE=1mA VOL VCC=VTH+0.1V, ISINK=1mA RESET Output Voltage 2.265 TA= -40°C to +85°C VCC to Reset Delay RESET Output Voltage TYP. MAX. UNIT 6 V 1 3 µA 2.3 2.335 0.9 AIC809-23 Reset Threshold MIN. 2.346 2.6 2.639 2.652 2.9 2.944 2.958 3.1 3.147 3.162 4.0 4.060 4.080 4.4 4.466 4.488 4.6 4.669 4.692 µS 20 TA=+25°C 140 TA= -40°C to +85°C 100 V 230 560 1030 0.8VCC 0.2Vcc 0.8VCC 0.2Vcc mS V V Note1: 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). Note2: RESET output is for AIC809; RESET output is for AIC810. 4 AIC809/AIC810 TYPICAL PERFORMANCE CHARACTERISTICS 120 1.4 VTH=2.3V Supply Current (µA) 1.3 1.2 1.1 VTH=3.1V 1.0 VTH=4.6V 0.9 0.8 0.7 0.6 Power-Down Reset Delay (µS) 1.5 110 VTH=2.3V VOD=VTH-VCC 100 90 80 70 VOD=50mV 60 50 VOD=100mV 40 30 VOD=200mV 20 10 0 0.5 -20 -40 0 40 20 60 80 100 -60 Temperature (°C) -40 -20 0 20 40 60 80 100 Temperature (°C) Fig 2 Power-Down Reset Delay vs. Temperature Fig 1 Supply Current vs. Temperature VTH=3.1V VOD=VTH-VCC 220 200 Power-Down Reset Delay (µS) Power-Down Reset Delay (µS) 240 180 160 140 VOD=50mV 120 100 80 60 VOD=100mV 40 VOD=200mV 20 0 -60 -40 0 -20 20 40 60 80 VTH=4.6V VOD=50mV 400 VOD=VTH-VCC 300 200 VOD=100mV 100 VOD=200mV 0 100 -60 -40 -20 0 20 40 60 80 100 Temperature (°C) Temperature (°C) Fig 3 Power-Down Reset Delay vs. Temperature Fig 4 Power-Down Reset Delay vs. Temperature Power-Up Reset Timeout (mS) Normalized Reset Threshold (V) 600 1.015 VTH=4.6V 1.010 1.005 1.000 VTH=3.1V 0.995 VTH=2.3V 0.990 0.985 -40 -20 0 20 40 60 80 100 500 400 VTH=3.1V VTH=4.6V 300 200 VTH=2.3V 100 0 -60 -40 -20 0 20 40 60 80 Temperature (°C) Temperature (°C) Fig 5 Normalized Reset Threshold vs. Temperature Fig 6 Power-Up Reset Timeout vs. Temperature 100 5 AIC809/AIC810 BLOCK DIAGRAMS VCC R1 Bandgap - RESET + Reset Generator NMOS R2 GND N-ch Open-Drain Type VCC R1 Bandgap - Reset Generator + RESET (RESET) R2 GND Push-Pull Type 6 AIC809/AIC810 PIN DESCRIPTIONS GND Pin : Ground. RESET Pin (AIC809) : Active low output pin. RESET Output remains low while Vcc is below the reset threshold. RESET Pin (AIC810) : 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 VTH>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 AIC809/810 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. APPLICATION INFORMATION NEGATIVE-GOING VCC TRANSIENTS In addition to issuing a reset to the μP during power-up, power-down, and brownout conditions, AIC809 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, AIC809 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, AIC809/810 with CMOS is perfect for most applications of VCC below 0.9V. However in applications where RESET must be valid down to 0V, adding a 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 AIC809N is open drain, this device interfaces easily with μPs that have bidirectional reset pins. Connecting the μ P supervisor’s RESET output directly to the microcontroller’s RESET pin with a single pull-up resistor allows either device to assert reset. 7 AIC809/AIC810 PHYSICAL DIMENSIONS (unit: mm) SOT-23 D S Y M B O L A A E E1 e e1 SEE VIEW B WITH PLATING c A A2 b BASE METAL SECTION A-A SOT-23 MILLIMETERS MIN. MAX. A 0.95 1.45 A1 0.05 0.15 A2 0.90 1.30 b 0.30 0.50 c 0.08 0.22 D 2.80 3.00 E 2.60 3.00 E1 1.50 0.95 BSC e1 1.90 BSC L 0.60 REF 0° 8° 0.25 θ 0.60 0.30 L1 A1 1.70 e GAUGE PLANE SEATING PLANE L1 θ L VIEW B Note: Information provided by AIC is believed to be accurate and reliable. However, we cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AIC product; nor for any infringement of patents or other rights of third parties that may result from its use. We reserve the right to change the circuitry and specifications without notice. Life Support Policy: AIC does not authorize any AIC product for use in life support devices and/or systems. Life support devices or systems are devices or systems which, (I) are intended for surgical implant into the body or (ii) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 8