Document
July 14, 2021
GENERAL DESCRIPTION
The SP809 is a low power mic roproc essor (μP) supervisory circuit used to monitor power supplies in μP and digital systems.
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.
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.
The SP809 is available in a 3 pin SOT-23 pac kage.
SP809
3 Pin Microprocessor Supervisor Circuit
R e v. 2.0.3
APPLICATIONS • Portable Electronic Devices • Electrical Power Meters • Digital Still Cameras • µP Power Monitoring
FEATURES • Ultra Low Supply Current 1µA (typ) • 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 • 1.5% Voltage Threshold Tolerance • 3 Pin SOT-23 Package
Part Number SP809N SP809
Output Type Open Drain Active Low
Push-Pull Low
TYPICAL APPLICATION DIAGRAM
Fig. 1: SP809 Application Diagram 1
SP809
3 Pin Microprocessor Supervisor Circuit
ABSOLUTE MAXIMUM 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.
VCC.................................................... -0.3V to 6.5V R ESET, RESET.................................. -0.3V to VCC+0.3V Output Current (RESET) ..................................... 20m A Powe r Dissipation (TA=70°C) .......................... 320m W Junction Tempe rature ..................................... 125°C Storage Tempe rature...........................-65°C to 150°C
OPERATING RATINGS
Input Voltage Range VCC............................. 0.9V to 6V Junction Tempe rature Range .................. -40°C to 85°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 TA = 25°C , and are provided for re ference purposes only. Unless otherwise indicated, TA= 25°C.
Parameter O pe rating Voltage Range VCC Supply C urre nt ICC
R e set Threshold VTH
VCC R e set Delay tTRIP R e set Active Timeout Period tRP RESET O utput Voltage VOH RESET O utput Voltage VOL
Min. 0.9
2.265 2.254 2.561 2.548 2.857 2.842 3.054 3.038 4.334 4.312 4.531 4.508
140 100 0 . 8 VCC
Typ. 1.0 2.3 2.6 2.9 3.1 4.4 4.6 20 230
Max. 6.0 3.0 2.335 2.346 2.639 2.652 2.944 2.958 3.147 3.162 4.466 4.488 4.669 4.692
560 1030
Units V µA
V
µs ms
Conditions
VCC=VTH +0 . 1 V T A=+2 5 °C • TA=-40°C to 85°C T A=+2 5 °C • TA=-40°C to 85°C T A=+2 5 °C • TA=-40°C to 85°C T A=+2 5 °C • TA=-40°C to 85°C T A=+2 5 °C • TA=-40°C to 85°C T A=+2 5 °C • TA=-40°C to 85°C VCC=VTH to (VTH - 0.1V), VTH=3.1V T A=+2 5 °C • TA=-40°C to 85°C VCC=VTH + 0.1V, ISOURCE = 1.2m A
V 0.3
VCC=VTH - 0.1V, ISINK = 1.2mA
207DSR00
2
Rev. 2.0.3
Parameter
SP809
3 Pin Microprocessor Supervisor Circuit
Min.
Typ.
Max.
Units
Conditions
BLOCK DIAGRAM
PIN ASSIGNMENT
Fig. 2: SP809N/SP809 Block Diagram
PIN DESCRIPTION
Name
Pin Number
207DSR00
Fig. 3: SP809 Pin Assignment
D e script ion 3
Rev. 2.0.3
SP809
3 Pin Microprocessor Supervisor Circuit
Name GND RESET VCC
Pin Number 1 2 3
D e script ion
Ground Signal Active Low O utput Pin. RESET O utput remains high while VC C is below the re set threshold
Supply Voltage
ORDERING INFORMATION
Part Number
Operating Temperature Range
Lead-Free
Package
Packing Method
SP 8 0 9 EK-L-2-3/TR
SP 8 0 9 EK-L-2-6/TR SP 8 0 9 EK-L-2-9/TR SP 8 0 9 NEK-L-3 -1 /TR
-40°C ≤TA≤+85°C
Yes
SO T23-3
Tape & R eel
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 Microprocessor Supervisor Circuit
TYPICAL PERFORMANCE CHARACTERISTICS
All data taken at TA = 25°C, unless otherwise specified - Schematic and BO M from Application Information se ct i on of t hi s d a ta sh eet.
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
THEORY OF OPERATION
μP w.