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
VCC
VCC
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 Conguration
VCC
VCC RESET
GND
GND
GND N.C.
N.C. (WDI)*
MAX698
MAX699*
1
+
2
3
4
8
7
6
5
DIP
SO
VCC
VCC
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
VCC .......................................................................-0.3V to +6.0V
Input Voltage (with respect to GND)
WDI, WDO, RESET, RESET .................................. -0.3V to VCC
Operating Temperature Range
C Suffix ...............................................................0°C to +70°C
E Suffix ........................................................... -40°C to +85°C
Rate of Rise, VCC ..........................................................100V/μs
Power Dissipation (TA = +70°C)
8-Pin PDIP (derated 5mW/°C above +70°C)...............400mW
16-Pin SO (derated 7mW/°C above +70°C) ................600mW
Storage Temperature Range ........................... -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
(VCC = +5V, TA = +25°C, unless otherwise noted.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Operating Voltage Range TA = full 3.0 5.5 V
Supply Current 5 mA
Power-Up Reset Deassertion TA = full 4.50 4.65 4.75 V
Power-Up Reset Assertion TA = full 4.4 V
Hysteresis 40 mV
Reset Output Pulse Width 140 500 ms
RESET OUTPUT (Open Drain) Output low ISINK = 1.6mA, VCC = 4.4V 0.4 V
Output high ISOURCE = 1μA, VCC = 5V 3.5
RESET OUTPUT (SO Package
Only)
Output low ISINK = 1.6mA, VCC = 5V 0.4 V
Output high ISOURCE = 1μA, VCC = 4.4V 3.5
WDO Output (MAX699 SO
Package Only)
Output low ISINK = 1.6mA, VCC = 5V 0.4 V
Output high ISOURCE = 1μA, VCC = 4.4V 3.5
MAX699 Watchdog Timeout
Period s
MAX699 Minimum WDI Input
Pulse Width ns
MAX699 WDI Input Threshold VCC = +5V Logic-low 0.8 V
Logic-high 3.8
MAX699 WDI Input Current WDI = VCC 20 50 µA
WDI = 0V -50 -15
MAX698/MAX699 Low-Cost, Power-On Reset
and Watchdog Controllers
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Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
PIN NAME FUNCTION
SO PDIP
1, 4, 9 3, 4, 8 GND Chip Power Ground
2, 3 1, 2 VCC +5V Sense Input and MAX698/MAX699 Chip Power
5–8, 10–14 5, 6 N.C. No Connection
11 6WDI (MAX699 Only)
(MAX699 Only.) A three-level input. If WDI remains high or low for more
than the watchdog timeout period, RESET pulses low (WDO also goes
low on the MAX699 SO package). If WDI is unconnected, the watchdog
circuit is disabled.
14 —WDO (MAX699 Only)
(MAX699 Only.) Goes low when WDI remains high or low for more
than the watchdog timeout period. WDO is set high at the next WDI
transition. If WDI is unconnected or at midsupply, WDO remains high.
WDO also remains high when VCC falls below 4.4V.
15 7 RESET Goes low when VCC falls below internally set threshold (see the
Electrical Characteristics table).
16 —RESET Goes high when VCC falls below internally set threshold.
WDI* WATCHDOG
TIMER
RESET
TIMER
VCC
VCC
GND
WDO*
RESET
RESET*
POWER-ON
RESET
4.65V MAX698
MAX699
*WDI ON MAX699 ONLY
RESET ON SO PACKAGE ONLY
WDO ON SO MAX699 ONLY
MAX698/MAX699 Low-Cost, Power-On Reset
and Watchdog Controllers
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Pin Description
Pin Conguration
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
8 PDIP P8-2 21-0043 —
16 Wide SO W16-1 21-0042 90-0107
MAX698/MAX699 Low-Cost, Power-On Reset
and Watchdog Controllers
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Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
Chip Topography
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
4 5/13 Corrected WDI SO pin number in Pin Description 3
59/14 No /V OPNs; removed automotive reference from Applications 1
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
MAX698/MAX699 Low-Cost, Power-On Reset
and Watchdog Controllers
© 2014 Maxim Integrated Products, Inc.
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Revision History
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
