MIC2775_15 Datasheet, PDF (1/9 Pages) Micrel Semiconductor – Micro-Power Voltage Supervisor

MIC2775
Micro-Power Voltage Supervisor
IttyBitty^®
General Description
The MIC2775 is a power supply supervisor that provides
undervoltage monitoring, manual reset capability, and
power-on reset generation in a compact 5-pin SOT
package. Features include an undervoltage detector, a
delay generator, a manual reset input, and both active-
high and active-low reset outputs. The undervoltage
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 suppy current is an ultra-
low 3.5µA.
Datasheets and support documentation are available on
Micrel’s website at: www.micrel.com.
Features
• Monitors power supply for undervoltage 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
• For extended temperature range see Micrel’s MAX825
• IttyBitty^® 5-pin SOT-23 package
Applications
• Monitoring processor core and input/output voltages
• Computer systems
• PDAs, handheld PCs
• Embedded controllers
• Telecommunications systems
• Power supplies
Typical Application
IttyBitty is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
March 23, 2015
Revision 4.0