Datasheet

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 conditions.
Circuit reliability is increased at reduced cost by eliminat-
ing 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 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
● Computers
● Controllers
● Intelligent Instruments
● Critical μP Power Monitoring
Features
● Precision Voltage Monitor
● Power-OK/Reset Time Delay
● Watchdog Timer
● Minimum Component Count
19-2349; Rev 5; 9/14
*Devices are available in both leaded and lead(Pb)-free pack-
aging. Specify lead free by adding the + symbol at the end of
the part number when ordering.
PART
*
TEMP RANGE PIN-PACKAGE
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
MAX698
1
2
3
4
V
CC
V
CC
GND
GND
GND
RESET
N.C.
N.C.
8
7
6
5
+5V
+5V
TO P
RESET
INPUT
MAX698/MAX699 Low-Cost, Power-On Reset
and Watchdog Controllers
Typical Operating Circuit
Pin Conguration
V
CC
V
CC
RESET
GND
GND
GND
N.C.
N.C. (WDI)*
MAX698
MAX699*
1
+
2
3
4
8
7
6
5
DIP
SO
V
CC
V
CC
RESET
RESET
GND
GND
N.C.
N.C. (WDO)*
MAX698
MAX699*
1
2
3
4
16
15
14
13
N.C.
N.C.
N.C.
N.C.
N.C.
GND
N.C.
N.C. (WDI)*
5
6
7
8
12
11
10
9
TOP VIEW
* PIN LABELS IN ( ) ARE FOR MAX699 ONLY
Ordering Information