SP809EK-L-4-6/TR

SP809 / SP810 3 Pin Microprocessor Supervisor Circuit November 2017 Rev. 2.0.2 GENERAL DESCRIPTION APPLICATIONS The SP809/SP810 are low power microprocessor (μP) supervisory circuits used to monitor power supplies in μP and digital systems. • Portable Electronic Devices They provide applications with benefits of circuit reliability and low cost by eliminating external components. If the VCC supply voltage falls below preset threshold then a reset signal is asserted for at least 140ms after VCC has risen above the reset threshold. • µP Power Monitoring • Electrical Power Meters • Digital Still Cameras FEATURES • Ultra Low Supply Current 1µA (typ) • Guaranteed Reset valid to VCC = 0.9V Both the SP809 and SP810 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 (1μA) makes SP809/SP810 ideal for portable equipment. • 140ms Power-On Reset Pulse Width • Internally Fixed Threshold 2.3V, 2.6V, 2.9V, 3.1V, 4.4V, 4.6V • 1.5% Voltage Threshold Tolerance • 3 Pin SOT-23 Package The devices are available in 3 pin SOT-23 package. Part Number Output Type SP809N SP809 SP810 Open Drain Active Low Push-Pull Low Push-Pull Active High TYPICAL APPLICATION DIAGRAM Fig. 1: SP809 / SP810 Application Diagram 1/8 Rev. 2.0.2 SP809 / SP810 3 Pin Microprocessor Supervisor Circuit ABSOLUTE MAXIMUM RATINGS OPERATING RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Input Voltage Range VCC ................................ 0.9V to 6V Junction Temperature Range ..................... -40°C to 85°C VCC .......................................................... -0.3V to 6.5V RESET, RESET ...................................... -0.3V to VCC+0.3V Output Current (RESET, RESET) ............................... 20mA Power Dissipation (TA=70°C) .............................. 320mW Junction Temperature .......................................... 125°C Storage Temperature .............................. -65°C to 150°C ELECTRICAL SPECIFICATIONS Specifications with standard type are for an Operating Temperature of TA = 25°C only; limits applying over the full Operating Temperature range are denoted by a “•”. Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TA = 25°C, and are provided for reference purposes only. Unless otherwise indicated, TA= 25°C. Parameter Operating Voltage Range VCC Min. Typ. 2.265 6.0 V 3.0 µA 2.3 2.335 2.6 2.857 Reset Threshold VTH 2.9 3.054 3.1 4.4 4.6 Reset Active Timeout Period tRP RESET Output Voltage VOH 140 100 RESET Output Voltage VOL 1030 0.3 0.8VCC 0.3 TA=-40°C to 85°C TA=+25°C • TA=-40°C to 85°C TA=+25°C • µs 560 TA=-40°C to 85°C TA=+25°C • 4.669 0.8VCC RESET Output Voltage VOL RESET Output Voltage VOH 230 • 4.466 20 VCC Reset Delay tTRIP V 4.692 4.508 TA=-40°C to 85°C TA=+25°C 4.488 4.312 4.531 2.944 3.147 TA=-40°C to 85°C TA=+25°C • 3.162 3.038 4.334 2.639 2.958 2.842 VCC=VTH+0.1V TA=+25°C 2.652 2.548 Conditions • 2.346 2.254 2.561 Units 1.0 0.9 Supply Current ICC Max. ms V V TA=-40°C to 85°C VCC=VTH to (VTH - 0.1V), VTH=3.1V TA=+25°C • TA=-40°C to 85°C VCC=VTH - 0.1V, ISOURCE = 1.2mA VCC=VTH + 0.1V, ISINK = 1.2mA VCC=VTH + 0.1V, ISOURCE = 1.2mA VCC=VTH - 0.1V, ISINK = 1.2mA Note 1: RESET output is for SP809; RESET output is for SP810. 2/8 Rev. 2.0.2 SP809 / SP810 3 Pin Microprocessor Supervisor Circuit BLOCK DIAGRAM Fig. 2: SP809 / SP810 Block Diagram PIN ASSIGNMENT Fig. 3: SP809 / SP810 Pin Assignment PIN DESCRIPTION Name Pin Number GND 1 RESET 2 RESET VCC 3 Description Ground Signal Active Low Output Pin. RESET Output remains high while VCC is below the reset threshold Active High Output Pin. RESET Output remains high while VCC is below the reset threshold Supply Voltage 3/8 Rev. 2.0.2 SP809 / SP810 3 Pin Microprocessor Supervisor Circuit ORDERING INFORMATION(1) Part Number Operating Temperature Range Lead-Free Package Packing Method -40°C≤TA≤+85°C Yes(2) SOT23-3 Tape & Reel SP809EK-L-2-3/TR SP809EK-L-2-6/TR SP809EK-L-2-9/TR SP809EK-L-3-1/TR(3) SP809EK-L-4-6/TR(3) SP809NEK-L-2-3/TR(3) SP809NEK-L-2-9/TR(3) SP809NEK-L-3-1/TR SP809NEK-L-4-6/TR(3) SP810EK-L-4-4/TR(3) NOTES: 1. Refer to www.exar.com/SP809 and www.exar.com/SP810 for most up-to-date Ordering Information. 2. Visit www.exar.com for additional information on Environmental Rating. 3. NRND – Not Recommended for New Designs. 4/8 Rev. 2.0.2 SP809 / SP810 3 Pin Microprocessor Supervisor Circuit TYPICAL PERFORMANCE CHARACTERISTICS All data taken at TA = 25°C, unless otherwise specified - Schematic and BOM from Application Information section of this datasheet. Fig. 4: Supply Current versus Temperature Fig. 5: Power-Down Reset Delay versus Temperature Fig. 6: Power-Down Reset Delay versus Temperature Fig. 7: Power-Down Reset Delay versus Temperature Fig. 8: Normalized Reset Threshold versus Temperature Fig. 9: Power-Up Reset Time-out versus Temperature 5/8 Rev. 2.0.2 SP809 / SP810 3 Pin Microprocessor Supervisor Circuit THEORY OF OPERATION 5V±5% or 3V±5% power supply. The reset is guaranteed to assert after the power supply falls below the minimum specified operating voltage range of the system ICs. The pretrimmed thresholds are reducing the range over which an undesirable reset may occur. μP will be activated at a valid reset state. These μP supervisory circuits assert reset to prevent code execution errors during powerup, power-down, or brownout conditions. Reset is guaranteed to be a logic low for VTH>VCC>0.9V. Once VCC exceeded 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. BENEFIT OF HIGHLY ACCURATE RESET THRESHOLD SP809/810 with specified voltage as 5V±10% or 3V±10% are ideal for systems using a Fig. 10: Timing Waveforms APPLICATION INFORMATION INTERFACING TO µP WITH BIDIRECTIONAL RESET PINS NEGATIVE GOING VCC TRANSIENTS In addition to issuing a reset to the µP during power-up, power-down, and brownout conditions, SP809 series are relatively resistant to short-duration negative-going VCC transient. The RESET output on the SP809N 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 pullup resistor allows either device to assert reset. ENSURING A VALID RESET OUTPUT DOWN TO VCC=0 TEST CIRCUIT When VCC falls below 0.9V, SP809 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, SP809/810 with CMOS is perfect for most applications of VCC down to 0.9V. Fig. 11: Test Circuit 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. 6/8 Rev. 2.0.2 SP809 / SP810 3 Pin Microprocessor Supervisor Circuit PACKAGE SPECIFICATION 3-PIN SOT23 7/8 Rev. 2.0.2 SP809 / SP810 3 Pin Microprocessor Supervisor Circuit REVISION HISTORY Revision Date 2.0.0 2011 2.0.1 August 2017 2.0.2 November 2017 Description Reformat of Datasheet Correction of package drawing Correct Reset Delay conditions. Updated to MaxLinear logo. Updated format and ordering information table. Corrected typo from rev 2.0.1, added 2 missing overlines to RESET in Electrical Specifications. 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