MIC708 Micrel Semiconductor, MIC708 Datasheet

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MIC708

Manufacturer Part Number
MIC708
Description
(MIC705 - MIC708) Supervisory Circuits
Manufacturer
Micrel Semiconductor
Datasheet

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DataSheet
MIC705/6/7/8 µP Supervisory Circuits
Description
The MIC705/MIC706/MIC707/MIC708 are inexpensive
microprocessor supervisory circuits that monitor power
supplies in microprocessor based systems. The circuit
functions include a watchdog timer, microprocessor
reset, power failure warning and a debounced manual
reset input.
The MIC705 and MIC706 offer a watchdog timer
function while the MIC707 and MIC708 have an active
high reset output in addition to the active low reset
output.
Supply voltage monitor levels of 4.65V and 4.4V are
available. The MIC705/MIC707 have a nominal reset
threshold level of 4.65V while the MIC706 and MIC708
have a 4.4V nominal reset threshold level. When the
supply voltage drops below the respective reset
threshold level, RESET is asserted.
Typical Applications
·
·
·
·
·
·
Ordering Information
MIC70_N
MIC70_M
4
Part
Automotive Systems
Intelligent Instruments
Critical Microprocessor Power Monitoring
Printers
Computers
Controllers
U
.com
8-Lead PDIP
8-Lead SOIC
Package
-40°C to +85°C
-40°C to +85°C
Temp. Range
DataSheet4U.com
Pin Configuration
Features
Typical Operating Circuit
·
·
·
·
·
Debounced Manual Reset Input is
TTL/CMOS Compatible
Reset Pulse Width, 200ms
Watchdog Timer, 1.6s (MIC705/MIC706)
4.4V or 4.65V Precision Voltage Monitor
Early Power Fail Warning
Detect
µP Supervisory Circuits
N Package - 8 Lead Plastic DIP Package
M Package - 8 Lead Plastic SOIC Package
MIC705/6/7/8
Top View
or Low Battery
1

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MIC708 Summary of contents

Page 1

... Supply voltage monitor levels of 4.65V and 4.4V are available. The MIC705/MIC707 have a nominal reset threshold level of 4.65V while the MIC706 and MIC708 have a 4.4V nominal reset threshold level. When the supply voltage drops below the respective reset threshold level, RESET is asserted. ...

Page 2

... 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. Electrical Characteristics 4.75V to 5.5V for MIC705/MIC707 4.5V to 5.5V for MIC706/MIC708, T Parameter Conditions ...

Page 3

... Electrical Characteristics 4.75V to 5.5V for MIC705/MIC707 4.5V to 5.5V for MIC706/MIC708, T Parameter MR Pull-Up Current MR Pulse Width Input Threshold MR to Reset Output Delay PFI Input Threshold PFI Input Current PFO Output Voltage DataSheet4U.com 4 DataSheet U .com MIC705/6/7/8 P Supervisory Circuits Conditions Min ...

Page 4

... MIC705/6/7/8 P Supervisory Circuits Pin Functions Pin No. MIC705 MIC707 Pin Name MIC706 MIC708 MR 1 VCC 2 GND 3 PFI 4 PFO 5 WDI 6 N/C N/A RESET 7 WDO 8 RESET N/A DataSheet4U.com 4 4 DataSheet U .com 1 Manual Reset Input forces RESET to assert when pulled below 0.8V. An internal pull-up current of 250 A on this input forces it high when left floating ...

Page 5

... Block Diagram Figure 1. MIC705/MIC706 Block Diagram Figure 2. MIC707/MIC708 Block Diagram DataSheet4U.com 4 DataSheet U .com MIC705/6/7/8 P Supervisory Circuits * 4.4V for MIC706 DataSheet4U.com * 4.4V for MIC708 5 ...

Page 6

MIC705/6/7/8 P Supervisory Circuits Circuit Description Power Fail Warning An additional comparator which is independent of other functions on the MIC705/706/707/708 is provided for early warning of power failure. An external voltage Unregulated DC R1 PFI 1.25V R2 Figure ...

Page 7

... MAX706CPA MIC706N MAX706CSA MIC706M MAX706EPA MIC706N ADM706AN MIC706N DS1706EPA MIC706N DS1706ESA MIC706M MAX707CPA MIC707N MAX707CSA MIC707M MAX707EPA MIC707N MAX707ESA MIC707M ADM707AN MIC707N DS1707EPA MIC707N DataSheet4U.com DS1707ESA MIC707M MAX708CPA MIC708N MAX708CSA MIC708M MAX708EPA MIC708N MAX708ESA MIC708M ADM708AN MIC708N DS1708EPA MIC708N DS1708ESA MIC708M 7 ...

Page 8

MIC705/6/7/8 P Supervisory Circuits Packaging Information M Package, 8-Pin Small Outline N Package, 8-Pin Plastic Dual-In-Line 0.035 0.015 0.150 0.125 DataSheet4U.com 8 4 DataSheet U .com DataSheet4U.com 0.400 0.370 0.260 0.240 0.310 0.290 0.150 0.120 0.110 0.370 0.300 0.090 ...

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