Datasheet

MR Input Voltage
MR Minimum Pulse Width
MR Glitch Immunity
MR to Reset Delay
MR Pullup Resistance
MAX6323/MAX6324
µP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
_______________________________________________________________________________________ 3
CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= full range, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V
CC
= 3V, T
A
= +25°C.) (Note 1)
Note 1: Devices are tested at T
A
= +25°C and guaranteed by design for T
A
= T
MIN
to T
MAX
, as specified.
Note 2: WDPO will pulse low if a falling edge is detected on WDI before this timeout period expires.
Note 3: To avoid a potential fake fault, the first WDI pulse after the rising edge of RESET or WDPO will not create a fast watchdog
timeout fault.
Note 4: WDPO will pulse low if no falling edge is detected on WDI after this timeout period expires.
MAX632_AUT_ _ 1 1.5
MAX632_BUT_ _ 10 15
MAX632_CUT_ _ 10 15
MAX632_DUT_ _ 10 15
MAX632_EUT_ _ 10 15
MAX632_FUT_ _ 17 23
MAX632_GUT_ _ 29 39
Watchdog Timeout (Fast)
(Notes 2, 3)
MAX632_HUT_ _ 543 719
mst
WD1
MAX632_AUT_ _ 10 15
MAX632_BUT_ _ 100 150
MAX632_CUT_ _ 300 450
ms
MAX632_DUT_ _ 10 15
MAX632_EUT_ _ 60 90
s
MAX632_FUT_ _ 47 63
MAX632_GUT_ _ 82 108
ms
t
WD2
MAX632_HUT_ _ 1.3 1.8 s
Watchdog Timeout (Slow)
(Note 4)
300 ns
WDI Glitch Immunity V
CC
= 5.5V 100 ns
V
IH
0.75 x V
CC
WDI Input Voltage
V
IL
0.8
V
V
WDI
= 0V -1.5 -1
WDI Input Current
V
WDI
= V
CC
1 1.5
µA
V
IL
= 0.8V, V
IH
= 0.75V x V
CC
0.5 1 3 ms
V
IH
0.7 x V
CC
V
IL
0.3 x V
CC
V
1 µs
V
CC
= 2.5V 100 ns
V
CC
= 2.5V 120 ns
50 85 kΩ
Minimum Watchdog Input
Pulse Width
WATCHDOG INPUT AND OUTPUT
MANUAL RESET INPUT
WDPO Pulse Width