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ISL12027_10 Datasheet, PDF (5/28 Pages) Intersil Corporation – Real Time Clock/Calendar with EEPROM
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ISL12027, ISL12027A
Watchdog Timer/Low Voltage Reset Parameters
SYMBOL
PARAMETER
CONDITIONS
tRPD
tPURST
VRVALID
VDD Detect to RESET LOW
Power-up Reset Time-Out Delay
Minimum VDD for Valid RESET
Output
VRESET ISL12027-4.5A Reset Voltage Level
ISL12027 Reset Voltage Level
ISL12027-3 Reset Voltage Level
ISL12027-2.7A Reset Voltage Level
ISL12027-2.7 Reset Voltage Level
tWDO Watchdog Timer Period
32.768kHz crystal between X1
and X2
tRST
Watchdog Timer Reset Time-Out 32.768kHz crystal between X1
Delay
and X2
tRSP I2C Interface Minimum Restart Time
EEPROM SPECIFICATIONS
EEPROM Endurance
EEPROM Retention
Temperature ≤ +75°C
MIN
TYP
MA
(Note 16) (Note 5) (Note 16)
500
100
250
400
1.0
UNITS
ns
ms
V
NOTES
13
4.59
4.64
4.69
V
4.33
4.38
4.43
V
3.04
3.09
3.14
V
2.87
2.92
2.97
V
2.58
2.63
2.68
V
1.70
1.75
1.801
s
725
750
775
ms
225
250
275
ms
225
250
275
ms
1.2
µs
>2,000,000
50
Cycles
Years
Serial Interface (I2C) Specifications
SYMBOL
PARAMETER
CONDITIONS
MIN
VIL SDA, and SCL Input Buffer LOW SBIB = 1 (Under VDD mode)
-0.3
Voltage
VIH SDA, and SCL Input Buffer HIGH SBIB = 1 (Under VDD mode)
Voltage
0.7xVDD
Hysteresis SDA and SCL Input Buffer
Hysteresis
SBIB = 1 (Under VDD mode)
0.05xVDD
VOL SDA Output Buffer LOW Voltage IOL = 4mA
0
ILI Input Leakage Current on SCL
VIN = 5.5V
ILO I/O Leakage Current on SDA
VIN = 5.5V
TIMING CHARACTERISTICS
fSCL SCL Frequency
tIN Pulse Width Suppression Time at Any pulse narrower than the max spec
SDA and SCL Inputs
is suppressed.
tAA SCL Falling Edge to SDA Output SCL falling edge crossing 30% of VDD,
Data Valid
until SDA exits the 30% to 70% of VDD
window.
tBUF
Time the Bus Must be Free Before
the Start of a New Transmission
SDA crossing 70% of VDD during a
STOP condition, to SDA crossing 70%
of VDD during the following START
condition.
1300
tLOW
tHIGH
Clock LOW Time
Clock HIGH Time
Measured at the 30% of VDD crossing.
Measured at the 70% of VDD crossing.
1300
600
TYP
MAX UNITS
0.3xVDD
V
VDD + 0.3
V
V
0.4
V
0.1
10
µA
0.1
10
µA
400
kHz
50
ns
900
ns
ns
ns
ns
NOTES
5
FN8232.8
August 12, 2010
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