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MAX6369 Datasheet(PDF) 5 Page - Maxim Integrated Products

Part No. MAX6369
Description  Pin-Selectable Watchdog Timers
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX6369 Datasheet(HTML) 5 Page - Maxim Integrated Products

 
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Pin-Selectable Watchdog Timers
_______________________________________________________________________________________
5
PIN
NAME
FUNCTION
1
WDI
Watchdog Input. If WDI remains either high or low for the duration of the watchdog timeout period (tWD), WDO
triggers a pulse. The internal watchdog timer clears whenever a WDO is asserted or whenever WDI sees a
rising or falling edge.
2
GND
Ground
3
N.C.
Not Connected. Do not make any connection to this pin.
4
SET0
Set Zero. Logic input for selecting startup delay and watchdog timeout periods. See Table 1 for timing details.
5
SET1
Set One. Logic input for selecting startup delay and watchdog timeout periods. See Table 1 for timing details.
6
SET2
Set Two. Logic input for selecting startup delay and watchdog timeout periods. See Table 1 for timing details.
7
WDO
Watchdog Output. Pulses low for the watchdog output pulse width, tWDO, when the internal watchdog times
out. The MAX6369/MAX6371/MAX6373 have open-drain outputs and require a pull-up resistor. The
MAX6370/MAX6372/MAX6374 outputs are push-pull.
8VCC
Supply Voltage (+2.5V to +5.5V)
Table 1. Minimum Timeout Settings
Pin Description
Detailed Description
The MAX6369–MAX6374 are flexible watchdog circuits
for monitoring µP activity. During normal operation, the
internal timer is cleared each time the µP toggles the
WDI with a valid logic transition (low to high or high to
low) within the selected timeout period (tWD). The WDO
remains high as long as the input is strobed within the
selected timeout period. If the input is not strobed
before the timeout period expires, the watchdog output
is asserted low for the watchdog output pulse width
(tWDO). The device type and the state of the three logic
control pins (SET0, SET1, and SET2) determine watch-
dog timing characteristics. The three basic timing varia-
tions for the watchdog startup delay and the normal
watchdog timeout period are summarized below (see
Table 1 for the timeout characteristics for all devices in
the family):
• Watchdog Startup Delay:
Provides an initial delay before the watchdog timer is
started.
Allows time for the µP system to power up and initial-
ize before assuming responsibility for normal watch-
dog timer updates.
Includes several fixed or pin-selectable startup delay
options from 200µs to 60s, and an option to wait for
the first watchdog input transition before starting the
watchdog timer.
LOGIC INPUTS
MAX6369/MAX6370
MAX6371/MAX6372
MAX6373/MAX6374
SET2
SET1
SET0
tDELAY, tWD
tDELAY = 60s, tWD
tDELAY
tWD
0
0
0
1ms
1ms
3ms
3ms
0
0
1
10ms
3ms
3s
3s
0
1
0
30ms
10ms
60s
1s
0
1
1
Disabled
Disabled
Disabled
Disabled
1
0
0
100ms
100ms
200
μs30μs
1
0
1
1s
300ms
First Edge
1s
1
1
0
10s
3s
First Edge
10s
1
1
1
60s
60s
60s
10s


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