MAX6370 MAXIM [Maxim Integrated Products], MAX6370 Datasheet

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MAX6370

Manufacturer Part Number
MAX6370
Description
Pin-Selectable Watchdog Timers
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet

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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 repeated-
ly 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 watch-
dog (WDO) output to signal that the system is not exe-
cuting 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
• Watchdog timeout period: normal operating watch-
• Watchdog output/timing options: open drain (100ms)
The MAX6369–MAX6374 operate over a +2.5V to +5.5V
supply range and are available in miniature 8-pin
SOT23 packages.
19-1676; Rev 4; 6/10
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
________________________Applications
MAX6369
MAX6370
MAX6371
MAX6372
MAX6373
MAX6374
before the watchdog timer is started.
dog timeout period after the initial startup delay.
or push-pull (1ms).
PART
Embedded Control Systems
Industrial Controllers
Critical µP and Microcontroller (µC) Monitoring
Automotive
Telecommunications
Networking
Open Drain
Push-Pull
Open Drain
Push-Pull
Open Drain
Push-Pull
OUTPUT
________________________________________________________________ Maxim Integrated Products
General Description
WDO PULSE
WIDTH (ms)
100
100
100
Pin-Selectable Watchdog Timers
1
1
1
Selectable: 1ms to 60s
Selectable: 1ms to 60s
60s
60s
S el ectab l e: 200µs to 60s or fi r st ed g e
S el ectab l e: 200µs to 60s or fi r st ed g e
MINIMUM STARTUP DELAY
♦ Precision Watchdog Timer for Critical
♦ Pin-Selectable Watchdog Timeout Periods
♦ Pin-Selectable Watchdog Startup Delay Periods
♦ Ability to Change Watchdog Timing Characteristics
♦ Open-Drain or Push-Pull Pulsed Active-Low
♦ Watchdog Timer Disable Feature
♦ +2.5V to +5.5V Operating Voltage
♦ 8µA Low Supply Current
♦ No External Components Required
♦ Miniature 8-Pin SOT23 Package
Note: All devices are available in tape-and-reel only. Required
order increment is 2,500 pieces.
/V denotes an automotive qualified part.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
Pin Configuration appears at end of data sheet.
MAX6369KA-T
MAX6369KA/V-T
MAX6369KA/V+T
MAX6370KA-T
MAX6371KA-T
MAX6372KA-T
MAX6373KA-T
MAX6374KA-T
µP Applications
Without Power Cycling
Watchdog Output
PART
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
Ordering Information
RANGE
S el ectab l e: 1ms to 60s
S el ectab l e: 1ms to 60s
S el ectab l e: 1ms to 60s
S el ectab l e: 1ms to 60s
S el ectab l e: 30µs to 10s
S el ectab l e: 30µs to 10s
TEMP
MINIMUM WATCHDOG TIMEOUT
Selector Guide
PIN-
PACKAGE
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
Features
MARK
AADC
AADC
AADC
AADD
AADG
AADH
AADE
AADF
TOP
1

Related parts for MAX6370

MAX6370 Summary of contents

Page 1

... Operating Voltage ♦ 8µA Low Supply Current ♦ No External Components Required ♦ Miniature 8-Pin SOT23 Package PART MAX6369KA-T MAX6369KA/V-T MAX6369KA/V+T MAX6370KA-T MAX6371KA-T MAX6372KA-T MAX6373KA-T MAX6374KA-T Note: All devices are available in tape-and-reel only. Required order increment is 2,500 pieces. /V denotes an automotive qualified part. ...

Page 2

... CC WDI.....................................................................-0.3V to +6V WDO (Open Drain: MAX6369/71/73) .................-0.3V to +6V WDO (Push-Pull: MAX6370/72/74 .......-0. SET0, SET1, SET2 ................................-0. Maximum Current, Any Pin (input/output)...........................20mA 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 ...

Page 3

... ELECTRICAL CHARACTERISTICS (continued +2.5V to +5.5V, SET_ = V or GND +3V.) (Note 1) CC PARAMETER SYMBOL MAX6369/MAX6370 Startup Delay Period t DELAY Watchdog Timeout Period MAX6371/MAX6372 Startup Delay Period t DELAY Watchdog Time-Out Period MAX6373/MAX6374 Startup Delay Period t DELAY _______________________________________________________________________________________ Pin-Selectable Watchdog Timers = -40°C to +125°C, unless otherwise noted. Typical values are at T ...

Page 4

... SET0 SET2 = 0V, SET0 = V CC SET1 SET2 = V , SET1 = SET0 SET2 = V , SET1 = V , SET0 = After WDO deasserted t WDI MAX6369/MAX6371/MAX6373 WDO MAX6370/MAX6372/MAX6374 After WDO deasserted Typical Operating Characteristics .) = +2. +25°C and A MIN TYP MAX = Watchdog Disabled ...

Page 5

... Log for sel ecti ng star tup and w atchd eout Tab for etai l s. Watchdog Output. Pulses low for the watchdog output pulse width, t WDO 7 out. The MAX6369/MAX6371/MAX6373 have open-drain outputs and require a pull-up resistor. The MAX6370/MAX6372/MAX6374 outputs are push-pull Supply Voltage (+2.5V to +5.5V) CC Table 1 ...

Page 6

... Open drain, active low with 100ms minimum watch- dog output pulse (MAX6369/MAX6371/MAX6373). Push-pull, active low with 1ms minimum watchdog output pulse (MAX6370/MAX6372/MAX6374). Each device has a watchdog startup delay that is initi- ated when the supervisor is first powered or after the user modifies any of the logic control set inputs. The ...

Page 7

... The startup delay and the watchdog timeout period are determined by the states of the SET0, SET1, and SET2 pins, and by the particular device within the family. For the MAX6369 and MAX6370, the startup delay is equal to the watchdog timeout period. The startup and watchdog timeout periods are pin selectable from 1ms to 60s (minimum) ...

Page 8

... Electrical Characteristics ), and small enough to register a logic high while supplying all input current and leakage paths connected to the WDO line. A 10kΩ pullup is sufficient in most applications. The MAX6370/ MAX6372/MAX6374 have push-pull outputs that pro- POSSIBLE vide an active-low watchdog output pulse of 1ms. ...

Page 9

... Pin-Selectable Watchdog Timers Pin Configuration TOP VIEW WDI MAX6369 GND 2 7 WDO MAX6370 MAX6371 N. SET2 MAX6372 MAX6373 SET0 4 5 SET1 MAX6374 SOT23 _______________________________________________________________________________________ TRANSISTOR COUNT: 1500 PROCESS: BiCMOS CC For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only ...

Page 10

... REVISION REVISION NUMBER DATE 0 4/00 Initial release 1 7/00 Removed future product asterisk for MAX6370. 2 2/03 Corrected limits in Electrical Characteristics. 3 12/05 Added lead-free information to Ordering Information. Revised the Ordering Information, Absolute Maximum Ratings, Electrical 4 6/10 Characteristics, and the Selecting Device Timing section. Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied ...

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