MIC809 Datasheet, PDF (1/8 Pages) Micrel Semiconductor – Microprocessor Reset Circuits

MIC809/MIC810 Microprocessor Reset Circuits
MIC809/MIC810
Microprocessor Reset Circuits
Description
The MIC809/MIC810 are inexpensive microprocessor
supervisory circuits that monitor power supplies in
microprocessor based systems.
The function of these devices is to assert a reset if the
power supply drops below a designated reset threshold
level. Several different reset threshold levels are
available to accomodate 3V, 3.3V or 5V powered
systems.
The MIC809 has an active low RESET output, while the
MIC810 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 level. The MIC809/MIC810 come in a 3-
pin SOT-23 package.
Typical Applications
· ^{Portable Equipment}
· ^{Intelligent Instruments}
· ^{Critical Microprocessor Power Monitoring}
· ^{Printers/Computers}
· ^Controllers
Reset Threshold
Voltage (V)
4.63
4.38
4.00
3.08
2.93
2.63
Device
Suffix
L
M
J
T
S
R
Ordering Information
Part
MIC809_U
MIC810_U
Package
3-Lead SOT23
3-Lead SOT23
Temp. Range
-40°C to +85°C
-40°C to +85°C
Place the device suffix of desired reset threshold voltage from table above in
blank to complete the part number.
Pin Configuration
Top View
GND 1
RESET 2
MIC809
3 VCC
GND 1
RESET 2
MIC810
3 VCC
Features
· RESET Remains Valid with VCC as Low
as 1.4V
· Precision Voltage Monitor for 3V, 3.3V
or 5V Power Supplies
· ^{Available in 3-Pin SOT23 Package}
· ^{<15µA Supply Current}
· ^{140ms Minimum Reset Pulse Width}
· ^{No External Components Required}
Typical Operating Circuit
8++
8++
MIC809
4-5-6
8++
µP
4-5-6
1