SMS44
Sym bol
Param eter
Notes
Min.
Typ.
Max.
U nti
WD2
WD1
WD0
0
0
1
1
1
1
0
1
0
1
OFF
400
280
560
520
Programmable watchdog
timer period
tPWDTO
0
0
800
1040
2080
4160
8320
0
1
1120
2240
4480
1600
3200
6400
ms
1
0
1
1
LD1
0
LD0
0
OFF
1600
3200
6400
Programmable longdog
timer period
tPLDTO
0
1
1120
2240
4480
2080
4160
8320
1
0
ms
ms
1
1
PUP#X-1 PUP#X-0
0
0
1
1
0
1
0
1
OFF
25
Programmable delay from
VPTH to PUP# out
t
PDLYX
50
100
100
IMR
MR# pullup current
µA
ns
TMR
MR# input pulse width
50
Delay from MR# low to
RESET# low
TDMRRST
100
ns
VIL
VIH
0.6
V
V
MR# input threshold
0.7 × VCC
2047 Elect TableB 2.0
SUMMIT MICROELECTRONICS, Inc.
2047 2.3 10/23/00
4
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
