MICREL MIC8114TU Datasheet
1
The MIC8114 is an inexpensive microprocessor reset
circuit that monitor power supplies in microprocessor
based systems.
The function of this device is to assert a reset if either
the power supply drops below a designated reset
threshold level or MR is forced low.
The MIC8114 has an active low RESET output. The
reset output is guaranteed to remain asserted for a
minimum of 790ms after VCC has risen above the
designated reset threshold level. The MIC8114 comes
in a 4-pin SOT-143 package.
Top View
Part Package Temp. Range
MIC8114TU 4-Lead SOT-143 -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 VCCas Low
as 1.4V
·
Precision Voltage Monitor for 3.3V
Power Supplies
·
Available in 4-Pin SOT-143 Package
·
<15µA Supply Current
·
790ms Minimum Reset Pulse Width
·
Manual Reset Input
·
Specifically tailored to the reset
requirements of the
AMD Elan SC400/410
Typical Operating Circuit
Features
Description Pin Configuration
Ordering Information
Typical Applications
MIC8114 Microprocessor Reset Circuit
MIC8114
Microprocessor Reset Circuit
1
GND
MIC8114
2
RESET 3
4
V
CC
MR
V
CC
V
CC
MIC8114
RESET
MR
V
RESET
CC
µP
MIC8114 Microprocessor Reset Circuit
2
Electrical Characteristics
VCC= 3.3V for MIC8114T, 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
915µA
Reset Voltage Threshold, V
TH
3.00 3.08 3.15 V
Reset Timeout Period 790 1200 1800 ms
RESET Output Voltage, V
OH
I
Source
= 500µA 0.8 X
V
CC
V
RESET Output Voltage, V
OL
VCC=VTHMin., I
Sink
=1.2mA
0.3 V
VCC>1.4V, I
Sink
=50µA,
TA= 0°C to 70°C 0.3 V
VCC>1.6V, I
Sink
=50µA,
TA= -40°C to 85°C 0.3 V
MR Minimum Pulse Width 10 µs
MR to Reset Delay 0.5 µs
MR Input Threshold, V
IH
0.7 X
V
CC
V
MR Input Threshold, V
IL
0.25 X
V
CC
V
MR Pull-Up Resistance
10 20 30 kΩ
MR Glitch Immunity
100 ns
Absolute Maximum Ratings
Terminal Voltage
VCC. . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.0V
MR . . . . . . . . . . . . . . . . . . . . . -0.3V to (VCC+ 0.3V)
Input Current, VCC, MR . . . . . . . . . . . . . . . . . . . . 20mA
Output Current, RESET . . . . . . . . . . . . . . 20mA
Rate of Rise, V
CC
. . . . . . . . . . . . . . . . . . . . . . 100V/µs
Operating Temperature Range
MIC8114TU . . . . . . . . . . . . . . . . . . . . . . . . -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
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.
MIC8114 Microprocessor Reset Circuit
Pin Functions
3
Pin Name Pin No. Description
GND 1 IC Ground Pin.
RESET 2 RESET goes low if either VCCfalls below the supply reset threshold or if MR is
asserted. RESET remains asserted for one reset timeout period (790ms min.) after
both VCCexceeds the supply reset threshold and MR is deasserted.
MR 3 Manual reset input. A logic low on MR forces a reset. The reset will remain asserted
as long as MR is held low and for one reset timeout period (790ms) min.) after MR
goes high. This input can be shorted to ground via a switch or driven from CMOS or
TTl logic. Pulled high internally through a 20k
Ω
resistor. Float if unused.
V
CC
4 Power supply input.
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