DS1232/DS1232S
AC ELECTRICAL CHARACTERISTICS
PARAMETER
PBRST
(0°C to 70°C; V
CC
=5V
±
10%)
MIN
20
250
20
100
300
250
0
610
5
20
1000
175
TYP
610
MAX
1000
UNITS
ms
ms
ns
µs
µs
ms
µs
ms
4
6, 8
NOTES
= V
IL
SYMBOL
t
PB
t
RST
t
ST
t
RPD
t
F
t
RPU
t
R
t
PDLY
RESET Active Time
ST
Pulse Width
V
CC
Fail Detect to RST and
RST
V
CC
Slew Rate 4.75V to 4.25V
V
CC
Detect to RST and
RST
Transition
V
CC
Slew Rate 4.25V to 4.75V
PBRST
Stable Low to RST and
RST
NOTES:
1. All voltages referenced to ground.
2. Measured with outputs open.
3.
PBRST
is internally pulled up to V
CC
with an internal impedance of 10k typical.
4. t
R
= 5
µs.
5.
RST
is an open-drain output.
6. Must not exceed t
TD
minimum. See Table 1.
7. RST remains within 0.5V of V
CC
on power-down until V
CC
drops below 2.0V.
RST
remains within
0.5V of GND on power-down until V
CC
drops below 2.0V.
8. Watchdog can not be disabled. It must be strobed to avoid resets.
7 of 7
DALLAS [ DALLAS SEMICONDUCTOR ]
