FM811 Datasheet, PDF (1/6 Pages) Fairchild Semiconductor – Microprocessor Reset Circuits

FM811/812
Microprocessor Reset Circuits
www.fairchildsemi.com
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 V_CC as Low as 1.4V
• Active Low Manual Reset Input
• No External Components
• 4-Pin SOT-143 Package
Applications
• Critical Microprocessor Power Monitoring
• Portable Equipment
• Intelligent Instruments
• Computers & Printers
• Controllers
Typical Applications
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
accommodate systems operating at 3V, 3.3V or 5V.
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 V_CC has risen above the designated reset threshold.
The FM811/FM812 is available in a 4-pin SOT-143.
V_CC
V_CC
FM811
FM812
RESET
(RESET)
MR
V_CC
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