MIC2782

Dual-Input Push Button Reset IC

with Immediate and Delayed Outputs

.

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

February 21, 2014

Revision 2.0

General Description

The MIC2782 is a two input, two output push-button reset

IC. It will generate a reset pulse for a factory-programmed

reset timeout period after both manual reset inputs have

been held to a logic-low for the factory-programmed setup

period. The MIC2782 also has an ANDOUT logic output

which will activate if both inputs are held low for longer

than a debounce time (1.5ms), and deactivate if one or

both inputs are released for longer than a debounce time

(1.5ms). The RESET and ANDOUT outputs are active-low,

open-drain NMOS outputs.

The MIC2782 operates over the 1.5V to 5.5V supply

voltage range, consuming 2.2

µA of supply current at 3.3V.

The device features 65k

Ω internal pull-up resistors on both

of the inputs (/MR1 and /MR2). The device offers factory

programmed setup periods of 6s, 8s, 10s, or 12s and reset

timeout periods of 0.5s, 1s or 2s. It is available in a space

saving, 6-bump, 0.4mm pitch, 0.8mm × 1.2mm wafer level

chip scale package.

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Features

• 1.5V to 5.5V operating supply voltage range

• 2.2µA supply current with /MR1, /MR2 not asserted

• Factory-programmed setup periods of 6s, 8s, 10s or 12s

• Factory-programmed reset timeout periods of 0.5s, 1s or

2s

• Integrated 65kΩ /MR1 and /MR2 pull-up resistors

• Supports single push-button reset with /MR1 tied to

/MR2

• RESET asserts after /MR1 and /MR2 are asserted low

for a setup period

• ANDOUT asserts after /MR1 and /MR2 are asserted low

for a debounce time (1.5ms)

• Open-drain RESET and ANDOUT outputs

• 6-bump, 0.4mm pitch, 0.8mm × 1.2mm wafer level chip

scale package (WLCSP)

Applications

• Smart phones

• Tablets

• eBooks

• Portable games

• Portable navigation device

____________________________________________________________________________________________________________________

Typical Application

/MR2

/MR1

PUSH-BUTTON

SWITCH

PUSH-BUTTON

SWITCH

100k

LOAD SWITCH

or PMIC

or µP

/RESET

/MR2

/MR1

ANDOUT

0.1uF

GND

VDD

100k

RESET

MIC2782

LOAD SWITCH

or PMIC

or µP

/RESET