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MAX698EPA+

P1-P3P4-P5
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
V
CC
.......................................................................-0.3V to +6.0V
Input Voltage (with respect to GND)
WDI, WDO, RESET, RESET .................................. -0.3V to V
CC
Operating Temperature Range
C Suffix ...............................................................0°C to +70°C
E Suffix ........................................................... -40°C to +85°C
Rate of Rise, V
CC
..........................................................100V/μs
Power Dissipation (T
A
= +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
(V
CC
= +5V, T
A
= +25°C, unless otherwise noted.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Operating Voltage Range T
A
= full 3.0 5.5 V
Supply Current 5 mA
Power-Up Reset Deassertion T
A
= full 4.50 4.65 4.75 V
Power-Up Reset Assertion T
A
= full 4.4 V
Hysteresis 40 mV
Reset Output Pulse Width 140 500 ms
RESET OUTPUT (Open Drain)
Output low I
SINK
= 1.6mA, V
CC
= 4.4V 0.4
V
Output high I
SOURCE
= 1μA, V
CC
= 5V 3.5
RESET OUTPUT (SO Package
Only)
Output low I
SINK
= 1.6mA, V
CC
= 5V 0.4
V
Output high I
SOURCE
= 1μA, V
CC
= 4.4V 3.5
WDO Output (MAX699 SO
Package Only)
Output low I
SINK
= 1.6mA, V
CC
= 5V 0.4
V
Output high I
SOURCE
= 1μA, V
CC
= 4.4V 3.5
MAX699 Watchdog Timeout
Period
s
MAX699 Minimum WDI Input
Pulse Width
ns
MAX699 WDI Input Threshold V
CC
= +5V
Logic-low 0.8
V
Logic-high 3.8
MAX699 WDI Input Current
WDI = V
CC
20 50
µA
WDI = 0V -50 -15
MAX698/MAX699 Low-Cost, Power-On Reset
and Watchdog Controllers
www.maximintegrated.com
Maxim Integrated
│
2
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 V
CC
+5V Sense Input and MAX698/MAX699 Chip Power
5–8, 10–14 5, 6 N.C. No Connection
11 6 WDI (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 V
CC
falls below 4.4V.
15 7
RESET
Goes low when V
CC
falls below internally set threshold (see the
Electrical Characteristics table).
16 — RESET Goes high when V
CC
falls below internally set threshold.
WDI*
WATCHDOG
TIMER
RESET
TIMER
V
CC
V
CC
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
www.maximintegrated.com
Maxim Integrated
│
3
Pin Description
Pin Conguration
P1-P3P4-P5

MAX698EPA+

Mfr. #:
Buy MAX698EPA+
Manufacturer:
Maxim Integrated
Description:
Supervisory Circuits Power-On Reset & Watchdog Ctlr
Lifecycle:
New from this manufacturer.
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