MIC2775 Datasheet, PDF (1/7 Pages) Micrel Semiconductor – Micro-Power Voltage Supervisor Advance Information

MIC2775
Micrel
MIC2775
Micro-Power Voltage Supervisor
Advance Information
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. Fea-
tures include an under-voltage detector, a delay generator, a
manual reset input, and both active-high and active-low reset
outputs. The under-voltage detector compares V_DD 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-lead 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
Part Number
MIC2775-XXBM5
Marking Junction Temp. Range
UJXX
–40°C to +85°C
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. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
September 29, 2000
1
MIC2775