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MIC2772-M2M3YML-TR

P1-P3P4-P6P7-P9
MIC2772
Dual Voltage Supervisor
General Description
The MIC2772 is a dual power supply supervisor that
provides under-voltage monitoring and power-on
reset generation. It may replace two discrete
voltage supervisors such as MIC1810, MIC1815,
MIC809, MIC811, MIC6315, etc. The two voltage
supervisors are completely independent. Each
functional block features an under-voltage detector,
a delay-generator, and a de-bounced manual reset
input.
A wide choice of voltage thresholds is available.
The reset output is asserted at power-on and any
time the input voltage drops below the reference
voltage. It remains asserted for the chosen timeout
period after the input rises back above the threshold.
Reset timeouts of 20, 140, and 1100ms (minimum)
are available.
A reset can be generated at any time by asserting
the manual reset input, /MR. This input is internally
de-bounced, and the reset output will remain active
for the timeout period after the release of /MR. The
/MR input can also be used to daisy-chain one or
more of the MIC2772’s supervisors onto existing
power monitoring circuitry or other supervisors.
The tiny 2x2mm MLF package has a footprint
smaller than that of a single SOT23 voltage
supervisor.
Data sheets and support documentation can be
found on Micrel’s web site at
www.micrel.com.
Features
• Two independent voltage supervisors
• Directly replaces discrete supervisors
• Generates power-on reset pulses
• De-bounced manual reset Inputs
• Choice of voltage thresholds
• 20, 140, or 1100ms reset timeouts
• Reset output may be pulled above VCC
• Rejects brief input transients
• Ultra-small 2x2mm MLF package
Applications
• Servers
• Embedded Controllers
• Telecommunications Systems
• Power Supply Sequencing
• Hot-swapping
• Power supplies
____________________________________________________________________________________________________
Typical Application
MR1
MR2
GND2
RESET2
VCC2
VCC2
10k
10k
RESET1
VCC1
VCC1
GND1
RESET
VCC
GND
GND
RESET
VCC
µP
µP
MIC2772 Typical Application Circuit
April 2005
M9999-042005
(408) 955-1690
Micrel MIC2772
Ordering Information
Part Number Top Mark Supervisor 1 Supervisor 2
Standard Pb-Free Standard Pb-Free
V
TH
(V)
t
RESET
(ms)
V
TH
(V)
t
RESET
(ms)
MIC2772-L2L3YML
(2)
UP0 4.63 20 4.63 140
MIC2772-M2M3YML
(2)
UP1 4.38 20 4.38 140
MIC2772-L3L3BML
(1)
MIC2772-L3L3YML
(1)
UP2 UP2 4.63 140 4.63 140
MIC2772-M3M3BML
(1)
MIC2772-M3M3YML
(1)
UP3 UP3 4.38 140 4.38 140
MIC2772-T3T3BML
(1)
MIC2772-T3T3YML
(1)
UP4 UP4 3.08 140 3.08 140
MIC2772-S3S3BML
(1)
MIC2772-S3S3YML
(1)
UP5 UP5 2.93 140 2.93 140
MIC2772-T2T3YML
(2)
UP6 3.08 20 3.08 140
MIC2772-S2S3YML
(2)
UP7 2.93 20 2.93 140
MIC2772-L3T3YML
(2)
UP8 4.63 140 3.08 140
MIC2772-M3S3YML
(2)
UP9 4.38 140 2.93 140
Note
:
1. Available now.
2. Contact factory.
Pin Configuration
1MR1
GND1
MR2
GND2
8 VCC1
RESET1
VCC2
RESET2
7
6
5
2
3
4
8-lead 2mm X 2mm MLF(ML)
April 2005 2
M9999-042605
(408) 955-1690
Micrel MIC2772
Pin Description
Pin Number Pin Name Pin Function
1
/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 t
RESET1
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.
2 GND1 Ground return for supervisor 1.
3
/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 t
RESET2
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.
4 GND2 Ground return for supervisor 2.
5
/RESET2
Digital Output; open-drain; supervisor 2. Asserted low whenever VCC2 falls
below the threshold voltage. It remains asserted for no less than t
RESET2
and is
de-asserted after VCC2 returns above the threshold.
6 VCC2 Analog Input. Power supply input for supervisor 2.
7
/RESET1
Digital Output; open-drain; supervisor 1. Asserted low whenever VCC1 falls
below the threshold voltage. It remains asserted for no less than t
RESET1
and is
de-asserted after VCC1 returns above the threshold.
8 VCC1 Analog Input. Power supply input for supervisor 1.
April 2005 3
M9999-042605
(408) 955-1690
P1-P3P4-P6P7-P9

MIC2772-M2M3YML-TR

Mfr. #:
Buy MIC2772-M2M3YML-TR
Manufacturer:
Microchip Technology / Micrel
Description:
Supervisory Circuits Dual Voltage Supervisor w/ Manual Reset & Active-Low Open-Drain Outputs 4.63V/20
Lifecycle:
New from this manufacturer.
Delivery:
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