MAX6302 Maxim, MAX6302 Datasheet - Page 7

• Manufacturer Part Number: MAX6302
• Description: +5V / Low-Power uP Supervisory Circuits with Adjustable Reset/Watchdog
• Manufacturer: Maxim

Figure 2a. Watchdog Timing Diagram, WDS = GND
Figure 2b. Watchdog Timing Diagram, WDS = V
timeout period, then momentarily pulses high, resetting
the watchdog counter. When WDI is left unconnected,
the watchdog timer is cleared by this internal driver just
before the timeout period is reached (the internal driver
pulls WDI high at about 94% of t
three-stated, the maximum allowable leakage current of
the device driving WDI is 10µA.
In normal mode (WDS = GND), the watchdog timer
cannot be disabled by three-stating WDI. WDI is a
high-impedance input in this mode. Do not leave WDI
unconnected in normal mode.
EXTENDED MODE (WDS = V
NORMAL MODE (WDS = GND)
RESET
RESET
WDI
WDI
V
V
V
V
CC
0V
CC
0V
CC
0V
CC
0V
_______________________________________________________________________________________
+5V, Low-Power µP Supervisory Circuits
CC
)
WD
with Adjustable Reset/Watchdog
). When WDI is
CC
t
WD
t
WD
x 500
Figure 3. Calculating the Reset (C
(C
SWT
) Timeout Capacitor Values
C
SRT
C
C
t
WD
RST
RST
in µs
=
in pF
2.67
t
RP
C
SWT
t
RP
C
C
t
WD
GND
SRT
SWT
SWT
SWT
in µs
=
in pF
MAX6301
MAX6302
MAX6303
MAX6304
2.67
t
WD
SRT
) and Watchdog
V
CC
V
CC
0.1µF
t
RP
7