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Kynix Part #: KY32-FM811RUX
Manufacturer Part#:


Product Category: IC Chips
Manufacturer: FAIRCHILD
  datasheetFM811RUX Datasheet
Package: SOT143
Quantity: 9540 PCS
Lead Free Status / RoHS Status: Lead free / RoHS Compliant
Moisture Sensitivity Level(MSL): 3(168 Hours)
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Manufacturer: FAIRCHILD
Product Category: IC Chips
Features, Applications

Features, Applications


Feature Precision Voltage Monitor for or 5V Power Supplies 6μA Supply Current 140ms Minimum Reset Pulse Width RESET Remains Valid with VCC as Low as 1.4V Active Low Manual Reset Input No External Components 4-Pin SOT-143 Package


The is a low cost microprocessor supervisory circuit that asserts a reset if the power supply drops below a designated threshold or the manual reset pin is forced low. Several different reset thresholds are available to accommodate systems operating or 5V.


Critical Microprocessor Power Monitoring Portable Equipment Intelligent Instruments Computers & Printers Controllers

The FM811 has an active low RESET output, while the FM812 offers an active high RESET output. The reset output is guaranteed to remain asserted for a minimum of 140ms after VCC has risen above the designated reset threshold. The FM811/FM812 is available 4-pin SOT-143.

Typical Applications

PRELIMINARY INFORMATION describes products that are in the design stage. Specifications may change in any manner whatever without notice. Contact Fairchild Semiconductor for current information.

Pin Number Pin Name GND RESET FM812 1 N/A Ground Pin RESET goes low if VCC falls below the reset threshold and remains asserted for one reset time-out period (140ms min.) after VCC exceeds the reset threshold. RESET goes high if VCC falls below the reset threshold and remains asserted for one reset time-out period (140ms min.) after VCC exceeds the reset threshold. Manual reset input. Shorting this pin to GND forces a reset. The reset will remain asserted as long MR is held low and for one reset time-out period (140ms min.) after MR goes high. This input cannot be driven by a CMOS or TTL logic. Push-button switch is recommended to be used with this pin. Float if unused. Power supply input, or 5V Description

Parameter Terminal Voltage Input Current Output Current Rate of Rise Operating Temperature Range Storage Temperature Range Lead Temperature Range Power Dissipation (TA = +70°C) Symbol VCC MR VCC, MR RESET, RESET VCC TA Ratings -0.3 to (VCC 300 320 Units V mA V/μs °C mW

Stresses above those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent device failure. Functionality at or above these limits is not implied. Exposure to absolute maximum ratings for extended periods may affect device reliability. Operating ranges define those limits between which the functionality of the device is guaranteed.

VCC = 5V for FM81_L/M/J, VCC = 3.3V for FM81_S/T, VCC = 3V for TA = Operating Temperature Range, unless otherwise noted. Parameter Operating Voltage Range Supply Current, ICC Reset Voltage Threshold, VTH Conditions FM811L/M/J, FM812L/M/J VCC FM811R, FM812R Min. 1.4 1.6 Typ. Max. Units μA V

Reset Time-out Period, tR RESET Output Voltage, VOH ISOURCE 800μA, FM811L/M/J ISOURCE 500μA, FM811R/S/T RESET Output Voltage, VOL VCC= VTH Min., ISINK 3.2mA, FM811L/M/J VCC= VTH Min., ISINK 1.2mA, FM811R/S/T VCC > 1.4V, ISINK = 50μA, TA= to 70°C VCC > 1.6V, ISINK = 50μA, TA= 0.8 x VCC RESET Output Voltage, VOH 1.8V < VCC < VTH Min., ISOURCE = 150μA RESET Output Voltage, VOL ISINK 3.2mA, FM810L/M/J ISINK 10 MR Minimum Pulse Width MR to Reset Delay MR Input Threshold, VIH VCC > VTH Max., 0.7 x VCC MR Input Threshold, VIL VCC > VTH Max., FM81_R/S/T MR Pull-Up Resistance 10 MR Glitch Immunity 

Search Part number : "FM811" Included word is 2
Part Number Manufacturer Package Quantity Description
FM811TUX SOT143 7550
  • FM811SUX
  • FM811TUX
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