FM812 Datasheet | Fairchild Semiconductor

Features - Feature - Precision Voltage Monitor for 3V, 3.3V 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 ponents - 4-Pin SOT-143 Package Description The FM811/FM812 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 acmodate systems operating at 3V, 3.3V or 5V. Preliminary Information Applications - - - - - Critical Microprocessor Power Monitoring Portable Equipment Intelligent Instruments puters & 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 in a 4-pin SOT-143. Typical Applications FM811 FM812 RESET (RESET) µP RESET INPUT ( ) = FM812 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. REV. 1.5.1 7/15/02 FM811/812 Pin Assignments Top View FM811 RESET RESET Preliminary Information Pin Definitions Pin Number Pin Name GND RESET FM811 1 2 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 as MR is held low and for one reset time-out period (140ms...