MIC2772
Dual Voltage Supervisor
General Description
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.
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.
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
Features
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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
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Servers
Embedded Controllers
Telecommunications Systems
Power Supply Sequencing
Hot-swapping
Power supplies
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Typical Application
VCC1
10k
MR1
VCC1
RESET1
GND1
VCC2
10k
MR2
VCC2
RESET2
GND2
VCC
RESET
GND
µP
VCC
RESET
GND
µP
MIC2772 Typical Application Circuit
April 2005
M9999-042005
(408) 955-1690
MICREL [ MICREL SEMICONDUCTOR ]
