19-2349; Rev 3; 12/05
Low-Cost, Power-On Reset
and Watchdog Controllers
General Description
The MAX698/MAX699 monitor the +5V supply in micro-
processor (µP) and digital systems. They supply a
RESET
pulse of at least 140ms duration on power-up,
power-down, and during low-voltage brownout condi-
tions. Circuit reliability is increased at reduced cost by
eliminating all external components and adjustments.
The MAX699 includes all features of the MAX698, but
also provides a watchdog input to monitor microproces-
sor activity. The
RESET
output goes low if the watchdog
input (WDI) is not toggled within 1 second. The watch-
dog feature can be disabled by leaving WDI open.
Both parts are supplied in 8-lead PDIP and 16-lead
0.3in wide small outline (SO) packages and are speci-
fied from 0°C to +70°C for C grade devices and -40°C
to +85°C for E devices. The SO versions, with more
pins than the 8-lead PDIP, have additional outputs not
available in DIP packages. These are RESET (without
inversion) and watchdog output (WDO).
♦
Precision Voltage Monitor
♦
Power-OK/Reset Time Delay
♦
Watchdog Timer
♦
Minimum Component Count
Features
MAX698/MAX699
Ordering Information
PART*
MAX698CPA
MAX698CWE
MAX698EPA
MAX698EWE
MAX699CPA
MAX699CWE
MAX699EPA
MAX699EWE
TEMP RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 PDIP
16 Wide SO
8 PDIP
16 Wide SO
8 PDIP
16 Wide SO
8 PDIP
16 Wide SO
Applications
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
*
Devices are available in both leaded and lead-free packag-
ing. Specify lead free by adding the + symbol at the end of the
part number when ordering.
Pin Configuration
TOP VIEW
V
CC
1
8
GND
Typical Operating Circuit
V
CC
2
MAX698
MAX699*
7
RESET
GND
3
6
N.C. (WDI)*
GND
4
5
N.C.
+5V
+5V
DIP
1
V
CC
GND
8
GND
1
16
RESET
2
V
CC
MAX698
RESET
7
TO
µP
RESET
INPUT
V
CC
2
15
RESET
V
CC
3
MAX698
MAX699*
14
N.C. (WDO)*
3
GND
N.C.
6
GND
4
13
N.C.
4
GND
N.C.
5
N.C.
5
12
N.C.
N.C.
6
11
N.C. (WDI)*
N.C.
7
10
N.C.
N.C.
8
SO
9
GND
* PIN LABELS IN ( ) ARE FOR MAX699 ONLY
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
