MIC2772 datasheet(3/9 Pages) MICREL

3 / 9 page

Micrel

MIC2772

Pin Description

Pin Number

Pin Name

Pin Function

/MR1

Digital Input; supervisor 1. Driving this pin low initiates an immediate and

unconditional reset. If VCC1 is above the threshold when /MR1 is released

(returns high), RESET1 will be de-asserted no less than tRESET1 later. /MR1 may

be driven by a CMOS or TTL logic signal or a mechanical switch. De-bouncing

is performed internally. /MR1 has an internal pull-up to VCC1; leave open if

unused.

GND1

Ground return for supervisor 1.

/MR2

Digital Input; supervisor 2. Driving this pin low initiates an immediate and

unconditional reset. If VCC2 is above the threshold when /MR2 is released

(returns high), the /RESET2 will be de-asserted no less than tRESET2 later. /MR2

may be driven by a CMOS or TTL logic signal or a mechanical switch. De-

bouncing is performed internally. /MR2 has an internal pull-up to VCC2; leave

open if unused.

GND2

Ground return for supervisor 2.

/RESET2

Digital Output; open-drain; supervisor 2. Asserted low whenever VCC2 falls

below the threshold voltage. It remains asserted for no less than tRESET2 and is

de-asserted after VCC2 returns above the threshold.

VCC2

Analog Input. Power supply input for supervisor 2.

/RESET1

Digital Output; open-drain; supervisor 1. Asserted low whenever VCC1 falls

below the threshold voltage. It remains asserted for no less than tRESET1 and is

de-asserted after VCC1 returns above the threshold.

VCC1

Analog Input. Power supply input for supervisor 1.

April 2005

M9999-042605

(408) 955-1690

MIC2772 Datasheet(PDF) 3 Page - Micrel Semiconductor