MIC2775

Micro-Power Voltage Supervisor

IttyBitty

®

IttyBitty is a registered trademark of Micrel, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

March 23, 2015

Revision 4.0

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

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

Applications

• Monitoring processor core and input/output voltages

• Computer systems

• PDAs, handheld PCs

• Embedded controllers

• Telecommunications systems

• Power supplies

Typical Application