MIC2772_05 Datasheet, PDF (1/9 Pages) Micrel Semiconductor – Dual Voltage Supervisor

MIC2772
Dual Voltage Supervisor
General Description
Features
The MIC2772 is a dual power supply supervisor that
provides under-voltage monitoring and power-on
reset generation. It may replace two discrete
voltage supervisors such as MIC1810, MIC1815,
MIC809, MIC811, MIC6315, etc. The two voltage
supervisors are completely independent. Each
functional block features an under-voltage detector,
a delay-generator, and a de-bounced manual reset
input.
A wide choice of voltage thresholds is available.
The reset output is asserted at power-on and any
time the input voltage drops below the reference
voltage. It remains asserted for the chosen timeout
period after the input rises back above the threshold.
Reset timeouts of 20, 140, and 1100ms (minimum)
are available.
• Two independent voltage supervisors
• Directly replaces discrete supervisors
• Generates power-on reset pulses
• De-bounced manual reset Inputs
• Choice of voltage thresholds
• 20, 140, or 1100ms reset timeouts
• Reset output may be pulled above VCC
• Rejects brief input transients
• Ultra-small 2x2mm MLF package
Applications
• Servers
• Embedded Controllers
A reset can be generated at any time by asserting
the manual reset input, /MR. This input is internally
de-bounced, and the reset output will remain active
for the timeout period after the release of /MR. The
/MR input can also be used to daisy-chain one or
more of the MIC2772’s supervisors onto existing
power monitoring circuitry or other supervisors.
• Telecommunications Systems
• Power Supply Sequencing
• Hot-swapping
• Power supplies
The tiny 2x2mm MLF package has a footprint
smaller than that of a single SOT23 voltage
supervisor.
Data sheets and support documentation can be
found on Micrel’s web site at www.micrel.com.
____________________________________________________________________________________________________
Typical Application
VCC1
MR1
VCC1
RESET1
GND1
10k
VCC
RESET µP
GND
VCC2
MR2
VCC2
RESET2
GND2
10k
VCC
RESET µP
GND
MIC2772 Typical Application Circuit
April 2005
M9999-042005
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