MIC2777-26BM5 TR Micrel Inc, MIC2777-26BM5 TR Datasheet - Page 5

• Manufacturer Part Number: MIC2777-26BM5 TR
• Description: IC SUPERVISOR DUAL MCPWR SOT23-5
• Manufacturer: Micrel Inc
• Type: Multi-Voltage Supervisorr

Specifications of MIC2777-26BM5 TR

• Number Of Voltages Monitored: 2
• Output: Complementary
• Reset: Active High/Active Low
• Reset Timeout: 140 ms Minimum
• Voltage - Threshold: 2.67V, Adj
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: MIC2777-26BM5TR; MIC2777-26BM5TR

Functional Diagram
Functional Description
IN, Under-Voltage Detector Input
The voltage present at the IN pin is compared to the internal
300mV reference voltage. A reset is triggered if and when V
falls below V
the input voltage to be monitored such that V
V
trip-point. Hysteresis is employed to prevent chattering due
to noise. The comparator on the IN input is relatively immune
to very brief negative-going transients.
V
The V
input voltage. The voltage at this pin is continually compared
against the internal reference. The trip-point at which a reset
occurs is factory programmed. A reset is triggered if and
when V
to prevent chattering due to noise. The comparator on the
V
transients.
November 2005
REF
DD
DD
Input
input is relatively immune to very brief negative-going
as the voltage being monitored falls below the desired
DD
DD
pin is both the power supply terminal and a monitored
falls below the trip-point. Hysteresis is employed
REF
. Typically, a resistor divider is used to scale
V
IN
DD
GND
V
V
REF
REF
IN
will fall below
IN
5
RST, /RST Reset Output
Typically, the MIC2777 is used to monitor the power supplies
of intelligent circuits such as microcontrollers and micropro-
cessors. By connecting the appropriate reset output of a
MIC2777 to the reset input of a µC or µP, the processor will
be properly reset at power-on and during power-down and
brown-out conditions.
The reset outputs are asserted any time V
below the corresponding threshold voltage. The reset outputs
remain asserted for t
return above the threshold boundaries and/or /MR is released.
A reset pulse is also generated at power-on.
Manual Reset
The ability to initiate a reset via external logic or a manual
switch is provided in addition to the MIC2777’s automatic
supervisory functions. Typically, a momentary push-button
switch is connected such that IN is shorted to ground when
the switch contacts close. Assuming V
tolerance when the switch is released, the reset outputs will
be de-asserted no less than 140ms later. IN can also be driven
by an open-drain or open-collector logic signal.
Delay
Line
One Shot
RST
R
S
MIC2777
(min) after V
/Q
Q
IN
/RST
RST
and/or V
DD
and V
DD
DD
or V
IN
subsequent
are within
MIC2777
IN
drops