Watchdog Timers. MAX6374 Datasheet

MAX6374 Datasheet PDF, Equivalent


Part Number

MAX6374

Description

Pin-Selectable Watchdog Timers

Manufacture

Maxim Integrated

Total Page 11 Pages
PDF Download
Download MAX6374 Datasheet PDF


MAX6374 Datasheet
MAX6369–MAX6374
Pin-Selectable Watchdog Timers
General Description
The MAX6369–MAX6374 are pin-selectable watchdog
timers that supervise microprocessor (μP) activity and
signal when a system is operating improperly. During
normal operation, the microprocessor should repeatedly
toggle the watchdog input (WDI) before the selected
watchdog timeout period elapses to demonstrate that
the system is processing code properly. If the μP does
not provide a valid watchdog input transition before the
timeout period expires, the supervisor asserts a watchdog
(WDO) output to signal that the system is not executing
the desired instructions within the expected time frame.
The watchdog output pulse can be used to reset the μP or
interrupt the system to warn of processing errors.
The MAX6369–MAX6374 are flexible watchdog timer
supervisors that can increase system reliability through
notification of code execution errors. The family offers
several pin-selectable watchdog timing options to match
a wide range of system timing applications:
Watchdog startup delay: provides an initial delay
before the watchdog timer is started.
Watchdog timeout period: normal operating watchdog
timeout period after the initial startup delay.
Watchdog output/timing options: open drain (100ms)
or push-pull (1ms).
The MAX6369–MAX6374 operate over a +2.5V to +5.5V
supply range and are available in miniature 8-pin SOT23
packages.
Benefits and Features
Precision Watchdog Timer for Critical μP Applications
Pin-Selectable Watchdog Timeout Periods
Pin-Selectable Watchdog Startup Delay Periods
Ability to Change Watchdog Timing Characteristics
Without Power Cycling
Open-Drain or Push-Pull Pulsed Active-Low
Watchdog Output
Watchdog Timer Disable Feature
+2.5V to +5.5V Operating Voltage
8μA Low Supply Current
No External Components Required
Miniature 8-Pin SOT23 Package
AEC-Q100 Qualified (MAX6369KA/V+ and
MAX6374KA/V+ Only)
Applications
Embedded Control Systems
Industrial Controllers
Critical μP and Microcontroller (μC) Monitoring
● Automotive
● Telecommunications
● Networking
Functional Diagram
VCC WDI
MAX6369–MAX6374
TRANSITION
DETECTOR
EN
SET 2
SET 1
SET 0
CONTROL
LOGIC
ENABLE
CLEAR
SET WATCHDOG TIMEOUT
SET STARTUP DELAY
WATCHDOG
TIMER CIRCUITRY
GND
OUT
OUTPUT
WDO
19-1676; Rev 8; 7/17

MAX6374 Datasheet
MAX6369–MAX6374
Pin-Selectable Watchdog Timers
Absolute Maximum Ratings
Terminal Voltage (with respect to GND)
VCC......................................................................-0.3V to +6V
WDI......................................................................-0.3V to +6V
WDO (Open Drain: MAX6369/71/73)...................-0.3V to +6V
WDO (Push-Pull: MAX6370/72/74........ -0.3V to (VCC + 0.3V)
SET0, SET1, SET2............................... -0.3V to (VCC + 0.3V)
Maximum Current, Any Pin (input/output)...........................20mA
Continuous Power Dissipation (TA = +70°C)
8-Pin SOT23 (derate 8.75mW/°C above +70°C).........700mW
Operating Temperature Range......................... -40°C to +125°C
Storage Temperature Range............................. -65°C to +150°C
Junction Temperature......................................................+150°C
VCC Rise or Fall Rate....................................................0.05V/μs
Lead Temperature (soldering, 10s).................................. +300°C
Soldering Temperature (reflow)
Lead(Pb)-free................................................................... +260°C
Containing Lead (Pb).......................................................+240°C
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
(VCC = +2.5V to +5.5V, SET_ = VCC or GND, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C and
VCC = +3V.) (Note 1)
PARAMETER
Operating Voltage Range
Supply Current
Input High Voltage
Input Low Voltage
Logic Input Current (Note 2)
WDO Output Low
Voltage
WDO Leakage Current
WDO Output High
Voltage
SYMBOL
VCC
ICC
VIH
VIL
VOL
ILKG
VOH
CONDITIONS
No load
TA = -40°C to +85°C
TA = -40°C to +125°C
WDI, SET0, SET1, SET2
VCC ≥ 3.3V,
TA = -40°C to +85°C
WDI, SET0,
SET1, SET2
VCC ≥ 3.3V,
TA = -40°C to +125°C
VCC ≥ 2.5V,
TA = -40°C to +85°C
VCC ≥ 2.5V,
TA = -40°C to +125°C
VWDI or VSET_ = 0V or VCC
ISINK = 1.2mA, VCC > 2.7V, watchdog
output asserted
ISINK = 6mA, VCC > 4.5V, watchdog output
asserted
VWDO = 0 to +5.5V, output deasserted,
MAX6369/MAX6371/MAX6373
ISOURCE = 500µA, VCC > 2.7V,
watchdog output deasserted
ISOURCE = 800µA, VCC > 4.5V,
watchdog output deasserted
MIN TYP
2.5
8
10
0.8 x VCC
0
0.8 x VCC
VCC - 1.5
MAX
5.5
20
22
UNITS
V
µA
V
0.8
0.6
V
0.6
0.4
±10 nA
0.3 V
0.4 V
1 µA
V
www.maximintegrated.com
Maxim Integrated │2


Features Datasheet pdf MAX6369–MAX6374 Pin-Selectable Watchd og Timers General Description The MAX6 369–MAX6374 are pin-selectable watchd og timers that supervise microprocessor (μP) activity and signal when a syste m is operating improperly. During norma l operation, the microprocessor should repeatedly toggle the watchdog input (W DI) before the selected watchdog timeou t period elapses to demonstrate that th e system is processing code properly. I f the μP does not provide a valid watc hdog input transition before the timeou t period expires, the supervisor assert s a watchdog (WDO) output to signal tha t the system is not executing the desir ed instructions within the expected tim e frame. The watchdog output pulse can be used to reset the μP or interrupt t he system to warn of processing errors. The MAX6369–MAX6374 are flexible wat chdog timer supervisors that can increa se system reliability through notificat ion of code execution errors. The famil y offers several pin-selectable watchdog timing options to matc.
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