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MIC2775_09 Datasheet, PDF (1/7 Pages) Micrel Semiconductor – Micro-Power Voltage Supervisor | |||
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MIC2775
MIC2775
Micrel, Inc.
Micro-Power Voltage Supervisor
General Description
The MIC2775 is a power supply supervisor that provides
under-voltage monitoring, manual reset capability, and
power-on reset generation in a compact 5-pin SOT package.
Features include an under-voltage detector, a delay genera-
tor, a manual reset input, and both active-high and active-low
reset outputs. The under-voltage detector compares VDD
against a fixed threshold. Ten factory-programmed thresholds
are available.
The reset outputs are asserted for no less than 140ms at
power-on and any time the input voltage drops below the
reference voltage. It remains asserted for the timeout period
after the input voltage subsequently rises back above the
threshold boundary. A reset can be generated at any time
by asserting the manual reset input, /MR. This reset output
will remain active at least 140ms after the release of /MR.
The /MR input can also be used to daisy-chain the MIC2775
onto existing power monitoring circuitry or other supervisors.
Hysteresis is included to prevent chattering due to noise.
Typical supply current is a low 3.5µA.
Features
⢠Monitors power supply for under-voltage conditions
⢠Choice of factory-programmed thresholds
⢠Generates 140ms (minimum) power-on RESET pulse
⢠Manual reset capability
⢠Both active-high and active-low RESET outputs
⢠/RST output valid down to 1.2V
⢠Ultra-low supply current, 3.5µA typical
⢠Rejects brief input transients
⢠No external components
⢠Pin compatible upgrade for MAX825
⢠IttyBitty⢠5-pin SOT-23 package
Applications
⢠Monitoring processor core and input/output voltages
⢠Computer systems
⢠PDAs, hand-held PCs
⢠Embedded controllers
⢠Telecommunications systems
⢠Power supplies
Ordering Information
Standard
MIC2775-XXBM5
Part Number
Marking Pb-Free
UJXX MIC2775-XXYM5
Marking
UJXX
Junction Temp. Range
â40ºC to +85ºC
Package
SOT-23-5
Typical Application
1.8V
Manual
Reset
MIC2775-17
VDD RST
/MR /RST
GND
MICROPROCESSOR
VDD
OTHER
LOGIC
/RESET
GND
IttyBitty⢠is a trademark of Micrel, Inc.
Micrel, Inc. ⢠2180Fortune Drive ⢠San Jose, CA 95131 ⢠USA ⢠tel + 1 (408) 944-0800 ⢠fax + 1 (408) 474-1000 ⢠http://www.micrel.com
June 2009
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MIC2775
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