SP809NEK-L-4-6

SP809 3 Pin Micro pro cesso r Superviso r C ircuit July 14, 2021 R e v. 2.0.3 GENERAL DESCRIPTION APPLICATIONS • Portable Electronic Devices The SP809 is a low power microprocessor (μP) supervisory circuit used to monitor power supplies in μP and digital systems. • Electrical Power Meters • Digital Still Cameras It provides applications with benefits of circuit reliability and low cost by eliminating ext ernal 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 FEATURES • Ultra Low Supply Current 1µA (typ) The SP809 was designed with a reset comparator to help identify invalid signals, which last less than 140ms. Low supply current (1μA) makes SP809 ideal for port able equipment. • Guaranteed Reset valid to VCC = 0.9V • 140ms Power-On Reset Pulse Width • Internally Fixed Threshold 2.3V, 2.6V, 2.9V, 3.1V, 4.4V, 4.6V The SP809 is available in a 3 pin SOT-23 package. Part Number SP809N SP809 • 1.5% Voltage Threshold Tolerance • 3 Pin SOT-23 Package Output Type Open Drain Active Low Push-Pull Low TYPICAL APPLICATION DIAGRAM Fig. 1: SP809 Application Diagram 1 SP809 3 Pin Micro pro cesso r Superviso r C ircuit ABSOLUTE MAXIMUM RATINGS OPERATING RATINGS The se are stress ratings only and functional operat i on o f the de vice at the se ratings or any othe r above those indicated in the operation sections of th e s pe ci fi cat i ons be low is not implied. Ex posu re t o a bsol ut e m ax im um rating conditions for e xtended periods of time may af fe ct re liability. Input Voltage Range VCC ............................. 0.9V to 6V Junction Tempe rature Range .................. -40°C to 85°C VCC .................................................... -0.3V to 6.5V R ESET, RESET.................................. -0.3V to VCC+0.3V Output Current (RESET) ..................................... 20m A Powe r Dissipation (T A=70°C) .......................... 320m W Junction Tempe rature ..................................... 125°C Storage Tempe rature...........................-65°C to 150°C ELECTRICAL SPECIFICATIONS Spe cifications with standard type are for an Operating Temperature o f T A = 2 5 °C onl y ; l im i t s a ppl y i ng o v e r t h e f ul l O pe rating Temperature range are denoted by a “•”. Minimum and Maximum limits are guaranteed through te st, desi gn , o r statistical corre lation. Typical values represent the most likely parametric norm at T A = 25°C , and are provided for re ference purposes only. Unless otherwise indicated, TA= 25°C. Parameter O pe rating Voltage Range VCC Min. Typ. Max. Units 1.0 6.0 3.0 V µA 2.3 2.335 0.9 Supply C urre nt I CC 2.265 2.254 2.561 2.6 2.857 R e set Threshold VTH 3.054 2.9 3.1 4.4 4.6 RESET O utput Voltage VOH 140 100 V T A=-40°C to 85°C T A=+25°C • µs 1030 T A=-40°C to 85°C T A=+25°C • 4.669 560 T A=-40°C to 85°C T A=+25°C • 4.692 230 • 4.466 20 T A=-40°C to 85°C T A=+25°C 4.488 4.508 VCC R e set Delay tTRIP R e set Active Timeout Period tRP 2.944 3.147 T A=-40°C to 85°C T A=+25°C • 3.162 4.312 4.531 2.639 2.958 3.038 4.334 T A=+25°C 2.652 2.842 VCC=VTH +0.1V • 2.346 2.548 Conditions ms 0.8VCC T A=-40°C to 85°C VCC=VTH to (VTH - 0.1V), VTH =3.1V T A=+25°C • T A=-40°C to 85°C VCC=VTH + 0.1V, I SOURCE = 1.2m A RESET O utput Voltage VOL 0.3 207DSR00 2 V VCC=VTH - 0.1V, I SINK = 1.2mA Rev. 2.0.3 SP809 3 Pin Micro pro cesso r Superviso r C ircuit Parameter Min. Typ. Max. Units Conditions BLOCK DIAGRAM Fig. 2: SP809N/SP809 Block Diagram PIN ASSIGNMENT Fig. 3: SP809 Pin Assignment PIN DESCRIPTION Name 207DSR00 Pin Number Description 3 Rev. 2.0.3 SP809 3 Pin Micro pro cesso r Superviso r C ircuit Name Pin Number Description GND 1 Ground Signal RESET 2 Active Low O utput Pin. RESET O utput remains high while VC C is below the re set threshold VCC 3 Supply Voltage ORDERING INFORMATION Part Number Operating Temperature Range Lead-Free Package Packing Method -40°C ≤T A≤+85°C Ye s SO T23-3 Tape & R e el SP809EK-L-2-3/TR SP809EK-L-2-6/TR SP809EK-L-2-9/TR SP809NEK-L-3-1/TR NOTE: For the m ost up-to-date ordering information and additional information on environmental rating, go to www.m ax line ar.com/SP809. 207DSR00 4 Rev. 2.0.3 SP809 3 Pin Micro pro cesso r Superviso r C ircuit TYPICAL PERFORMANCE CHARACTERISTICS All data taken at T A = 25°C, unless otherwise specified - Schematic and BO M from Application Information se ct i on of t hi s datasheet. Fig. 4: Supply Curre nt ve rsus Temperature Fig. 5: Powe r-Down R eset Delay versus Temperature Fig. 6: Powe r-Down R eset Delay versus Temperature Fig. 7: Powe r-Down R eset Delay versus Temperature Fig. 8: Norm alized Reset Thre shold ve rsus Temperature Fig. 9: Powe r-Up Reset Time-out ve rsus Temperature 207DSR00 5 Rev. 2.0.3 SP809 3 Pin Micro pro cesso r Superviso r C ircuit 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. THEORY OF OPERATION μP will be activated at a valid reset state. These μP supervisory circuits assert reset t o prevent code execution errors during pow erup, 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 t hreshold, the internal timer resets to zero, and RESET goes low. The internal timer is activated af ter VCC returns above the reset threshold, and RESET remains low for the reset timeout period. BENEFIT OF HIGHLY ACCURATE RESET T HRESHOLD SP809 with specified voltage as 5V±10% or 3V±10% are ideal for systems using a 5V±5% Fig. 10: Timing Waveforms APPLICATION INFORMATION NEGATIVE GOING VCC T RANSIENTS INTERFACING TO µP WITH BIDIRECTIONAL RESET PINS 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 V C C transient. E NSURING TO VCC=0 A 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. VALID RESET OUTPUT DOWN 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 with CMOS is perfect for most applications of VCC down to 0.9V. T EST C IRCUIT However in applications where RESET must be valid down to 0V, adding a pull-down resist or to RESET causes any leakage currents to flow to ground, holding RESET low. 207DSR00 Fig. 11: Test Circuit 6 Rev. 2.0.3 SP809 3 Pin Micro pro cesso r Superviso r C ircuit PACKAGE SPECIFICATION 3-PIN SOT23 207DSR00 7 Rev. 2.0.3 SP809 3 Pin Micro pro cesso r Superviso r C ircuit REVISION HISTORY Revision Date 2.0.0 2011 2.0.1 August 2017 2.0.2 2.0.3 Description R e format of Datasheet C orre ction of package drawing C orre ct R eset Delay conditions. Updated to MaxLinear logo. Updated format and orde ring information table. Nove m ber 2017 C orre cte d typo from rev 2.0.1, added 2 missing overlines to RESET in Ele ctrical Spe cifications. Updated:  "3-Pin SOT23 Package Specification" figure.  "O rde ring Information" table. July 14, 2021 Removed:  SP810 mentions removed as being an obsolete product. 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