19-1078; Rev 0; 6/96
+5V, Low-Power µP Supervisory Circuits
with Adjustable Reset/Watchdog
_______________General Description
The MAX6301/MAX6302/MAX6303/MAX6304* low-
power microprocessor (µP) supervisory circuits provide
maximum adjustability for reset and watchdog functions.
The reset threshold can be adjusted to any voltage
above 1.22V, using external resistors. In addition, the
reset and watchdog timeout periods are adjustable
using external capacitors. A watchdog select pin
extends the watchdog timeout period to 500x. The reset
function features immunity to power-supply transients.
These four devices differ only in the structure of their reset
outputs (see
Selector Guide).
The MAX6301–MAX6304
are available in the space-saving 8-pin µMAX package,
as well as 8-pin DIP/SO.
____________________________Features
o
Adjustable Reset Threshold
o
Adjustable Reset Timeout
o
Adjustable Watchdog Timeout
o
500x Watchdog Timeout Multiplier
o
4µA Supply Current
o
RESET or
RESET
Output Options
o
Push/Pull or Open-Drain Output Options
o
Guaranteed
RESET
Asserted At or Above
V
CC
= 1V (MAX6301/MAX6303)
o
Power-Supply Transient Immunity
o
Watchdog Function Can Be Disabled
o
DIP/SO/µMAX Packages Available
MAX6301–MAX6304
________________________Applications
Medical Equipment
Intelligent Instruments
Portable Equipment
Battery-Powered
Computers/Controllers
Embedded Controllers
Critical µP Monitoring
Set-Top Boxes
Computers
______________Ordering Information
PART
MAX6301CPA
MAX6301CSA
MAX6301CUA
MAX6301EPA
MAX6301ESA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 Plastic DIP
8 SO
8 µMAX
8 Plastic DIP
8 SO
_____________________Selector Guide
FEATURE
Active-Low
Reset
Active-High
Reset
Open-Drain
Reset Output
Push/Pull
Reset Output
Pins-Package
MAX6301 MAX6302 MAX6303 MAX6304
—
—
—
—
—
—
—
—
Ordering Information continued at end of data sheet.
__________Typical Operating Circuit
V
IN
MAX6301
ONLY
R1
1
R2
2 GND
RESET 7
(RESET)
R
L
MAX6302
ONLY
I/O
RESET
µP
RESET IN
V
CC
8
R
L
0.1µF
8-DIP/SO/ 8-DIP/SO/ 8-DIP/SO/ 8-DIP/SO/
µMAX
µMAX
µMAX
µMAX
__________________Pin Configuration
TOP VIEW
RESET IN 1
GND 2
SRT 3
SWT 4
8
V
CC
RESET (RESET)
WDI
WDS
MAX6301
MAX6302
MAX6303
MAX6304
7
6
5
MAX6301
MAX6302
3
WDI 6
SRT
MAX6303
4
5
SWT
MAX6304
WDS
C
SRT
C
SWT
DIP/SO/µMAX
( ) ARE FOR MAX6302/MAX6304.
( ) ARE FOR MAX6302/MAX6304.
WDS = 0 FOR NORMAL MODE
WDI = 1 FOR EXTENDED MODE
* Patents pending
________________________________________________________________
Maxim Integrated Products
1
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
