MIC705 Datasheet, PDF (1/8 Pages) Micrel Semiconductor – Supervisory Circuits

MIC705/6/7/8 µP Supervisory Circuits
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
· ^{Automotive Systems}
· ^{Intelligent Instruments}
· ^{Critical Microprocessor Power Monitoring}
· ^Printers
· ^Computers
· ^Controllers
Pin Configuration
Top View
MR 1
VCC 2
GND 3
PFI 4
MIC705
MIC706
8 WDO
7 RESET
6 WDI
5 PFO
N Package - 8 Lead Plastic DIP Package
M Package - 8 Lead Plastic SOIC Package
MR 1
VCC 2
GND 3
PFI 4
MIC707
MIC708
8 RESET
7 RESET
6 NC
5 PFO
Features
· 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 or Low Battery}
Detect
Typical Operating Circuit
Ordering Information
Part
MIC70_N
MIC70_M
Package
8-Lead PDIP
8-Lead SOIC
Temp. Range
-40°C to +85°C
-40°C to +85°C
+5V (Regulated)
Manual
Reset
DC Voltage
(Unregulated)
VCC
MR RESET
MIC705
MIC706
WDI
WDO
PFI
PFO
VCC
RESET
µP
I/O Line
NMI
Interrupt
1