19-1078; Rev 4; 9/10
+5V, Low-Power µP Supervisory Circuits
with Adjustable Reset/Watchdog
1–MAX6304
_______________General Description
____________________________Features
o Adjustable Reset Threshold
The MAX6301–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 capaci-
tors. A watchdog select pin extends the watchdog time-
out period to 500x. The reset function features immunity
to power-supply transients.
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
These four devices differ only in the structure of their reset
outputs (see the Selector Guide). The MAX6301–MAX6304
are available in the space-saving 8-pin µMAX® package,
as well as 8-pin PDIP and SO packages.
V
CC
= 1V (MAX6301/MAX6303)
o Power-Supply Transient Immunity
o Watchdog Function can be Disabled
o PDIP/SO/µMAX Packages Available
Applications
Embedded Controllers
Medical Equipment
Intelligent Instruments Critical µP Monitoring
Ordering Information
Portable Equipment
Set-Top Boxes
Computers
PART
TEMP RANGE
PIN-PACKAGE
Battery-Powered
MAX6301CPA
0°C to +70°C
8 PDIP
Computers/Controllers
MAX6301CSA
MAX6301CUA
MAX6301EPA
MAX6301ESA
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
8 SO
Selector Guide
FEATURE MAX6301 MAX6302 MAX6303 MAX6304
8 µMAX
8 PDIP
8 SO
Active-Low
Reset
√
—
√
—
√
√
—
—
√
—
√
Devices are available in both leaded and lead(Pb)-free/RoHS-
compliant packaging. Specify lead-free by adding the “+
symbol at the end of the part number when ordering.
Active-High
Reset
”
Ordering Information continued at end of data sheet.
Open-Drain
Reset Output
√
—
√
Push-Pull
Reset Output
Typical Operating Circuit
—
—
V
IN
8-PDIP/SO/ 8-PDIP/SO/ 8-PDIP/SO/ 8-PDIP/SO/
µMAX µMAX µMAX µMAX
Pin-Package
MAX6301
ONLY
R1
R2
Pin Configuration
1
2
8
7
R
L
V
RESET IN
GND
CC
TOP VIEW
0.1µF
V
RESET IN
1
2
3
4
8
7
6
5
CC
RESET
(RESET)
RESET
RESET (RESET)
GND
SRT
MAX6301
MAX6302
MAX6303
MAX6304
WDI
µP
MAX6301
R
L
MAX6302
ONLY
MAX6302
MAX6303
MAX6304
WDS
3
4
WDI
6
5
SWT
SRT
I/O
SWT
WDS
DIP/SO/µMAX
C
C
SWT
SRT
( ) ARE FOR MAX6302/MAX6304.
WDS = 0 FOR NORMAL MODE
WDS = 1 FOR EXTENDED MODE
( ) ARE FOR MAX6302/MAX6304.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.