MAX6370KA-T Maxim Integrated Products, MAX6370KA-T Datasheet

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MAX6370KA-T

Manufacturer Part Number
MAX6370KA-T
Description
MAX6370KA-TPin-Selectable Watchdog Timers
Manufacturer
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 2; 2/03
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.
________________________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
o Precision Watchdog Timer for Critical
o Pin-Selectable Watchdog Timeout Periods
o Pin-Selectable Watchdog Startup Delay Periods
o Ability to Change Watchdog Timing Characteristics
o Open-Drain or Push-Pull Pulsed Active-Low
o Watchdog Timer Disable Feature
o +2.5V to +5.5V Operating Voltage
o 8µA Low Supply Current
o No External Components Required
o Miniature 8-Pin SOT23 Package
Note: All devices are available in tape-and-reel only. Required
order increment is 2,500 pieces.
Pin Configuration appears at end of data sheet.
MAX6369KA-T
MAX6370KA-T
MAX6371KA-T
MAX6372KA-T
MAX6373KA-T
MAX6374KA-T
µP Applications
Without Power Cycling
Watchdog Output
PART
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
RANGE
Ordering Information
TEMP
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
MINIMUM WATCHDOG TIMEOUT
Selector Guide
PIN-
PACKAGE
8 SOT23-8
8 SOT23-8
8 SOT23-8
8 SOT23-8
8 SOT23-8
8 SOT23-8
Features
MARKS
AADG
AADC
AADD
AADH
AADE
AADF
TOP
1

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MAX6370KA-T Summary of contents

Page 1

... Watchdog Timer Disable Feature o +2.5V to +5.5V Operating Voltage o 8µA Low Supply Current o No External Components Required o Miniature 8-Pin SOT23 Package PART MAX6369KA-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. Pin Configuration appears at end of data sheet. ...

Page 2

Pin-Selectable Watchdog Timers ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND) V .....................................................................-0.3V to +6V 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 ...

Page 3

ELECTRICAL CHARACTERISTICS (continued +2.5V to +5.5V, SET_ = V or GND +3V.) (Note 1) CC PARAMETER SYMBOL Watchdog Timeout Period MAX6371/MAX6372 Startup Delay Period t Watchdog Time-Out Period MAX6373/MAX6374 Startup Delay Period t ...

Page 4

Pin-Selectable Watchdog Timers ELECTRICAL CHARACTERISTICS (continued +2.5V to +5.5V, SET_ = V or GND +3V.) (Note 1) CC PARAMETER SYMBOL Watchd og Inp WDI ( ...

Page 5

PIN NAME Watchdog Input. If WDI remains either high or low for the duration of the watchdog timeout period (t triggers a pulse. The internal watchdog timer clears whenever a WDO is asserted or whenever WDI sees a 1 WDI ...

Page 6

Pin-Selectable Watchdog Timers MAX6369–MAX6374 SET 2 CONTROL SET 1 LOGIC SET 0 Figure 1. Functional Diagram t V SETUP CC WDI A A WDO A TRANSITIONS ON WDI IGNORED DURING SETUP DELAY. B TRANSITION(S) ON WDI IGNORED DURING STARTUP DELAY ...

Page 7

When the startup delay expires, the watchdog begins counting its normal watchdog timeout period and waiting for WDI transitions. The startup delay ...

Page 8

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2003 Maxim Integrated Products to register a logic high while supplying all input current and leakage paths connected to the WDO line. A 10kΩ ...

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