MIC811 Micrel Semiconductor, MIC811 Datasheet

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MIC811

Manufacturer Part Number
MIC811
Description
Microprocessor Reset Circuits
Manufacturer
Micrel Semiconductor
Datasheet

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MIC811/MIC812 Microprocessor Reset Circuits
Description
The MIC811/MIC812 are inexpensive microprocessor
supervisory circuits that monitor power supplies in
microprocessor based systems.
The function of these devices is to assert a reset if
either the power supply drops below a designated reset
threshold level or MR is forced low. Several different
reset threshold levels are available to accomodate 3V,
3.3V or 5V powered systems.
The MIC811 has an active low RESET output, while the
MIC812 offers an active high RESET output. The reset
output is guaranteed to remain asserted for a minimum
of 140ms after V CC has risen above the designated
reset threshold level. The MIC811/MIC812 come in a 4-
pin SOT-143 package.
Typical Applications
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·
·
·
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Ordering Information
Place the device suffix of desired reset threshold voltage from table above in
blank to complete the part number.
MIC811_U
MIC812_U
Part
Portable Equipment
Intelligent Instruments
Critical Microprocessor Power Monitoring
Printers/Computers
Controllers
Reset Threshold
Voltage (V)
4.63
4.38
4.00
3.08
2.93
2.63
4-Lead SOT-143
4-Lead SOT-143
Package
Device
Suffix
M
R
T
S
L
J
-40°C to +85°C
-40°C to +85°C
Temp. Range
Pin Configuration
Features
Typical Operating Circuit
·
·
·
·
·
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RESET Remains Valid with V CC as Low
as 1.4V
Precision Voltage Monitor for 3V, 3.3V
or 5V Power Supplies
Available in 4-Pin SOT-143 Package
<15 A Supply Current
140ms Minimum Reset Pulse Width
Manual Reset Input
Microprocessor Reset Circuits
MIC811/MIC812
MR
V CC
RESET
Top View
V CC
RESET
V CC
1

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MIC811 Summary of contents

Page 1

... MR is forced low. Several different reset threshold levels are available to accomodate 3V, 3. powered systems. The MIC811 has an active low RESET output, while the MIC812 offers an active high RESET output. The reset output is guaranteed to remain asserted for a minimum of 140ms after V CC has risen above the designated reset threshold level ...

Page 2

... I Source = 800 A, MIC811L/M/J I Source = 500 A, MIC811R/S/T RESET Output Voltage Min., I Sink =3.2mA, MIC811L/M Min., I Sink =1.2mA, MIC811R/S >1.4V, I Sink = 0°C to 70° >1.6V, I Sink = -40°C to 85°C RESET Output Voltage 1.8V < < Min., ...

Page 3

... MIC811/MIC812 Microprocessor Reset Circuits Pin Functions Pin No. Pin Name MIC811 MIC812 GND 1 1 RESET 2 N/A RESET N Description IC Ground Pin. RESET goes low falls below the reset threshold and remains asserted for one reset timeout period (140ms min.) after V CC exceeds the reset threshold ...

Page 4

... MIC811/MIC812 Microprocessor Reset Circuits Block Diagram Figure 1. MIC811/812 Block Diagram 4 ...

Page 5

... MIC81_R/S/T) or less will not cause an unwanted reset. Interfacing to Bidirectional Reset Pins The MIC811/MIC812 can interface with bidirectional reset pins by connecting a 4.7K resistor in series with the MIC811/MIC812 output and the P reset pin. Figure 3. RESET Valid 0V. Figure 2. Reset Timing Diagram Ps with ...

Page 6

... MIC811/MIC812 Microprocessor Reset Circuits Alternate Source Cross Reference Guide Industry P/N MAX811JEUS-T MAX811LEUS-T MAX811MEUS-T MAX811REUS-T MAX811SEUS-T MAX811TEUS-T MAX812JEUS-T MAX812LEUS-T MAX812MEUS-T MAX812REUS-T MAX812SEUS-T MAX812TEUS-T 6 MIC Direct Replacement MIC811JU MIC811LU MIC811MU MIC811RU MIC811SU MIC811TU MIC812JU MIC812LU MIC812MU MIC812RU MIC812SU MIC812TU ...

Page 7

... MIC811/MIC812 Microprocessor Reset Circuits Packaging Information U Package, 4-Pin SOT-143 Small-Outline Transistor Package Dimensions are in inches. Device Marking Information Lot Code KJXX = MIC811J KLXX = MIC811L KMXX = MIC811M KRXX = MIC811R KSXX = MIC811S KTXX = MIC811T LJXX = MIC812J LLXX = MIC812L LMXX = MIC812M LRXX = MIC812R LSXX = MIC812S ...

Page 8

... MIC811/MIC812 Microprocessor Reset Circuits Packaging Information 2.7–0.1 3.1–0.1 8 Tape and Reel Information 4.0–0.1 2.0–0.05 fl1.1–0.1 4.0–0.1 1.2–0.1 Dimensions are in millimeters. fl1.5–0.1 1.75–0.1 3.5–0.05 8.0–0.3 ...

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