MAX698/MAX699
Low-Cost, Power-On Reset
and Watchdog Controllers
General Description
The MAX698/MAX699 monitor the +5V supply in microprocessor (μP) and digital systems. They supply a
RESET pulse of at least 140ms duration on power-up,
power-down, and during low-voltage brownout conditions.
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 microprocessor activity. The RESET output goes low if the watchdog
input (WDI) is not toggled within 1 second. The watchdog
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 specified 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).
Applications
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Features
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Precision Voltage Monitor
Power-OK/Reset Time Delay
Watchdog Timer
Minimum Component Count
Ordering Information
PART*
TEMP RANGE
MAX698CPA
0°C to +70°C
8 PDIP
MAX698CWE
0°C to +70°C
16 Wide SO
MAX698EPA
-40°C to +85°C
8 PDIP
MAX698EWE
-40°C to +85°C
16 Wide SO
MAX699CPA
0°C to +70°C
8 PDIP
MAX699CWE
0°C to +70°C
16 Wide SO
MAX699EPA
-40°C to +85°C
8 PDIP
MAX699EWE
-40°C to +85°C
16 Wide SO
*Devices are available in both leaded and lead(Pb)-free packaging. Specify lead free by adding the + symbol at the end of
the part number when ordering.
Pin Configuration
Computers
Controllers
Intelligent Instruments
Critical μP Power Monitoring
TOP VIEW
+
VCC
1
VCC
2
GND
+5V
3
GND
Typical Operating Circuit
2
3
4
VCC
GND
VCC
RESET
GND
GND
N.C.
7
6
N.C. (WDI)*
N.C.
GND
15
RESET
3
14
N.C. (WDO)*
4
13
N.C.
N.C.
5
12
N.C.
N.C.
5
2
GND
6
RESET
VCC
TO P
RESET
INPUT
16
VCC
7
1
6
11
N.C. (WDI)*
N.C.
7
10
N.C.
N.C.
8
9
GND
MAX698
MAX699*
SO
* PIN LABELS IN ( ) ARE FOR MAX699 ONLY
19-2349; Rev 5; 9/14
RESET
5
MAX698
MAX699*
GND
DIP
8
MAX698
N.C.
8
4
+5V
1
PIN-PACKAGE