MAX698_05 Datasheet, PDF (1/4 Pages) Maxim Integrated Products – Low-Cost, Power-On Reset and Watchdog Controllers

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).
Applications
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
Typical Operating Circuit
+5V
1
V_CC
2
V_CC
3
GND
4
GND
MAX698
8
GND
7
RESET
6
N.C.
5
N.C.
+5V
TO µP
RESET
INPUT
♦ Precision Voltage Monitor
♦ Power-OK/Reset Time Delay
♦ Watchdog Timer
♦ Minimum Component Count
Features
Ordering Information
PART*
MAX698CPA
TEMP RANGE
0°C to +70°C
PIN-PACKAGE
8 PDIP
MAX698CWE
MAX698EPA
0°C to +70°C
-40°C to +85°C
16 Wide SO
8 PDIP
MAX698EWE
MAX699CPA
MAX699CWE
-40°C to +85°C
0°C to +70°C
0°C to +70°C
16 Wide SO
8 PDIP
16 Wide SO
MAX699EPA
MAX699EWE
-40°C to +85°C
-40°C to +85°C
8 PDIP
16 Wide SO
*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
V_CC 2
GND 3
GND 4
MAX698
MAX699*
8 GND
7 RESET
6 N.C. (WDI)*
5 N.C.
DIP
GND 1
V_CC 2
V_CC 3
GND 4
N.C. 5
N.C. 6
N.C. 7
N.C. 8
* PIN LABELS IN ( ) ARE FOR MAX699 ONLY
MAX698
MAX699*
SO
16 RESET
15 RESET
14 N.C. (WDO)*
13 N.C.
12 N.C.
11 N.C. (WDI)*
10 N.C.
9 GND
________________________________________________________________ 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.