MICREL MIC1810U Datasheet
1
The MIC1810 is an inexpensive microprocessor
supervisory circuits that monitor power supplies in
microprocessor based systems.
The function of these devices is to assert a reset if the
power supply drops below a designated reset threshold
level. Several different reset threshold levels are
available to accomodate 5%, 10%, or 15% drop in 5V
powered systems.
The MIC1810 has an active low RESET output. The
reset output is guaranteed to remain asserted for a
minimum of 100ms after VCC has risen above the
designated reset threshold level. The MIC1810 comes
in a 3-pin SOT-23 package.
1
2
3
V
CC
GND
MIC1810
RESET
Top View
Part Package Temp. Range
MIC1810_U 3-Lead SOT23 -40°C to +85°C
Place the device suffix of desired reset threshold voltage from table above in
blank to complete the part number.
·
Portable Equipment
·
Intelligent Instruments
·
Critical Microprocessor Power Monitoring
·
Printers/Computers
·
Controllers
·
RESET Remains Valid with V
CC
as Low
as 1.4V
·
Precision Voltage Monitor for 5%, 10%,
or 15% drop in 5V Power Supplies
·
Available in 3-Pin SOT23 Package
·
9µA Supply Current (typical)
·
100ms Minimum Reset Pulse Width
·
No External Components Required
V
CC
RESET
µP
RESET
V
CC
MIC1810
V
CC
Typical Operating Circuit
Features
Description Pin Configuration
Ordering Information
Typical Applications
Reset Threshold Device
Voltage (V) Suffix
4.62 -5
4.37 -10
4.12 -15
MIC1810 Microprocessor Reset Circuit
MIC1810
Microprocessor Reset Circuit
MIC1810 Microprocessor Reset Circuit
2
Electrical Characteristics
VCC= 5V, TA= Operating Temperature Range, unless otherwise noted.
Parameter Conditions Min Typ Max Units
Operating Voltage Range, V
CC
TA= 0°C to 70°C 1.4 5.5 V
TA= -40°C to 85°C 1.6 5.5
Supply Current, I
CC
920µA
Reset Voltage Threshold, V
TH
MIC1810-5 4.50 4.62 4.75 V
MIC1810-10 4.25 4.37 4.50
MIC1810-15 4.00 4.12 4.24
Reset Timeout Period 100 150 250 ms
RESET Output Voltage, V
OH
I
Source
= 800µA
VCC- 1.5V
V
RESET Output Voltage, V
OL
VCC=VTHMin., I
Sink
=3.2mA
0.4 V
VCC>1.4V, I
Sink
=50µA
0.3
Stresses above those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent device failure. Functionality at or above these limits is not implied. Exposure to absolute
maximum ratings for extended periods may affect device reliability. Operating ranges define those limits between which the functionality of the device is guaranteed.
Absolute Maximum Ratings
Terminal Voltage
VCC. . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.0V
Input Current, VCC, . . . . . . . . . . . . . . . . . . . . . . . 20mA
Output Current, RESET . . . . . . . . . . . . . . 20mA
Rate of Rise, V
CC
. . . . . . . . . . . . . . . . . . . . . . 100V/µs
Operating Temperature Range
MIC1810
-
U . . . . . . . . . . . . . . . . . . . . . . . . -40°C to 85°C
Storage Temperature Range . . . . . . . . . . . . .-65°C to 150°C
Lead Temperature (Soldering - 10 sec.) . . . . . . . . . . . 300°C
Power Dissipation (TA= +70°C) . . . . . . . . . . . . . . . . 320mW
MIC1810 Microprocessor Reset Circuit
Pin Functions
3
RESET goes low if VCCfalls below the reset threshold and remains asserted for one
reset timeout period (100ms min.) after VCCexceeds the reset threshold.
Power supply input, 5V.
IC Ground Pin.
Pin Name Pin No.
RESET 1
V
CC
2
GND 3
Loading...