MIC2775
Micro-Power Voltage Supervisor
IttyBitty
®
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
detector compares V
DD
against a fixed threshold. Ten
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
®
IttyBitty 5-pin SOT-23 package
Applications
•
•
•
•
•
•
Monitoring processor core and input/output voltages
Computer systems
PDAs, handheld PCs
Embedded controllers
Telecommunications systems
Power supplies
Typical Application
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
Micrel, Inc.
MIC2775
Ordering Information
Part Number
(1,2)
Marking
(1,3)
Junction Temperature Range
–40°C to +85°C
Package
(4)
MIC2775-XXYM5
Note:
UJXX
SOT-23-5
1. XX = Voltage Code, see
Part Numbering Conventions
below. There are ten standard versions available with an order increment of 3,000 pieces.
Samples of standard versions are normally available from stock. Contact factory for information on non-standard versions. Available in tape-and-reel
only.
2. Order entry part number add a space, then TR. Example: MIC2775-22YM5 TR.
3. Underbar (__) symbol may not be to scale.
4. Standard reel SOT-23: Reel diameter is 7 inches, hub diameter is 2 inches, width is 8mm.
Part Numbering Conventions
March 23, 2015
2
Revision 4.0
Micrel, Inc.
MIC2775
Pin Configuration
SOT-23-5 (M5)
(Top View)
Pin Description
Pin Number
1
2
3
Pin Name
/RST
GND
RST
Pin Function
Digital (Output): Asserted low whenever V
DD
falls below the reference voltage. It will remain
asserted for no less than 140ms after V
DD
returns above the threshold limit.
Ground.
Digital (Output): Asserted high whenever V
DD
falls below the reference voltage. It will remain
asserted for no less than 140ms after V
DD
returns above the threshold limit.
Digital (Input): Driving this pin low initiates an immediate and unconditional reset. Assuming V
DD
is above the threshold when /MR is released (returns high), the reset output will be de-asserted
no less than 140ms later. /MR has an internal pull-up to V
DD
and may be left open if unused.
Analog (Input): Power supply input and the voltage being monitored.
4
5
/MR
VDD
March 23, 2015
3
Revision 4.0
Micrel, Inc.
MIC2775
Absolute Maximum Ratings
(5)
Supply Voltage (V
DD
) .................................... –0.3V to +7.0V
Output Voltage (V
/MR
) ................................... –0.3V to +7.0V
RST, (/RST) Current ................................................... 20mA
Storage Temperature (Ts)......................... –65°C to +150°C
(7)
ESD Rating ............................................................... 1.5kV
Operating Ratings
(6)
Supply Voltage (V
DD
) .................................... +1.5V to +5.5V
Input Voltage (V
/MR
) ...................................... –0.3V to +6.0V
Ambient Temperature (T
A
) .......................... –40°C to +85°C
Package Thermal Resistance (θ
JA
) ........................ 256°C/W
Electrical Characteristics
(8)
T
A
= 25°C,
bold
values indicate –40°C≤ T
A
≤ +85°C, unless noted.
Symbol
I
DD
Parameter
Supply Current
Condition
V
DD
= V
TH
+ 1.6%, /MR, RST, /RST open,
Min.
Typ.
3.5
Max.
Units
µA
VDD Voltage Threshold
Undervoltage Threshold on
VDD
V
HYST
Hysteresis Voltage
V
TH
-
1.5%
V
TH
1
V
TH
+
1.5%
V
%
RST, /RST Outputs
t
PROP
t
RST
V
OL
Propagation Delay
Reset Pulse Width
RST or /RST Output Voltage
Low
RST or /RST Output Voltage
High
I
SINK
= 1.6mA; V
DD
≥ 1.6V
I
SINK
= 100µA; V
DD
≥ 1.2V;
Note 9
I
SOURCE
= 500µA; V
DD
≥ 1.5V
I
SOURCE
= 10µA; V
DD
≥ 1.2V;
Note 9
0.8V
DD
0.8V
DD
V
DD
= V
TH
+ 1.5% + 100mV to
V
DD
= V
TH
– 1.5% - 100mV
140
20
280
0.3
0.3
µs
ms
V
V
V
V
V
OH
/MR Input
V
IH
V
IL
t
PROP
t
MIN
I
PU
I
IN
Notes:
Input High Voltage
Input Low Voltage
Propagation Delay
Minimum Input Pulse Width
Internal Pull-up Current
Input Current, /MR
V
/MR
< V
IL
From V
/MR
< (V
IL
– 100mV)
Reset occurs, V
/MR
< V
IL
0.7V
DD
0.3V
DD
5
33
100
100
V
V
µs
ns
nA
nA
5. Exceeding the absolute maximum ratings may damage the device.
6. The device is not guaranteed to function outside its operating ratings.
7. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF.
8. Specification for packaged product only.
9. V
DD
operating range is 1.5V to 5.5V. Output is guaranteed to be asserted down to V
DD
= 1.2V.
March 23, 2015
4
Revision 4.0
Micrel, Inc.
MIC2775
Timing Diagram
Note:
Propagation delays not shown for clarity.
A = The MIC2775 ignores very brief transients. See the
Application Information
section for details.
March 23, 2015
5
Revision 4.0
微控制器 MCU
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