DS1232 Datasheet, PDF (7/7 Pages) Dallas Semiconductor – MicroMonitor Chip

AC ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
PBRST = V_IL
t_PB
RESET Active Time
t_RST
ST Pulse Width
t_ST
V_CC Fail Detect to RST and RST
t_RPD
V_CC Slew Rate 4.75V to 4.25V
t_F
V_CC Detect to RST and RST Transition
t_RPU
V_CC Slew Rate 4.25V to 4.75V
t_R
PBRST Stable Low to RST and RST
t_PDLY
MIN
20
250
20
300
250
0
DS1232/DS1232S
(0°C to 70°C; V_CC=5V ± 10%)
TYP MAX UNITS NOTES
ms
610 1000
ms
ns
6, 8
100 175
µs
µs
610 1000
ms
4
5
µs
20
ms
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.
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