SMS45
PreliminaryInformation
AC OPERATING CHARACTERISTICS
(OverRecommendedOperatingConditions;VoltagesarerelativetoGND, alsoseeconfigurationregisters)
Symbol
Parameter
Notes
Min.
Typ.
Max.
Unit
WD2
WD1
WD0
0
0
1
1
1
1
0
1
0
0
1
1
X
1
0
1
0
1
OFF
400
—
300
600
500
Programmable Watchdog
timer period
tPWDTO
800
1000
2000
4000
8000
1200
2400
4800
1600
3200
6400
ms
PUP#X-1 PUP#X-0
0
0
1
1
0
1
0
1
0ms
25
—
Programmable delay from
VPTH to PUP# out
t
PDLYX
19
38
75
31
63
50
ms
100
100
300
125
IMR
MR# pullup current
µA
ns
TMR
MR# input pulse width
Minimum
Delay from MR# low to
RESET# low
TDMRRST
200
ns
RTO1
RTO0
0
0
1
1
0
1
0
1
19
38
25
50
31
63
ms
ms
ms
ms
µs
Programmable reset pulse
width
tPRTO
75
100
200
20
125
250
150
tDRST
V in to RESET# delay
100mV overdrive
SUMMIT MICROELECTRONICS, Inc.
2079 1.2 05/24/04
5
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
