ISL12030 Datasheet, PDF (5/17 Pages) Intersil Corporation – Low Power RTC with 50/60 Cycle AC Input, Alarms and Daylight Savings Correction

ISL12030
I²C Interface Specifications Specifications apply for: V_DD = 2.7 to 5.5V, T_A = -40°C to +85°C,
unless otherwise stated. (Continued)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
(Note 8)
TYP
MAX
(Note 3) (Note 8) UNITS NOTES
R_PU
SDA and SCL Bus Pull-up Resistor Maximum is determined by
1
Off-chip
t_R and t_F.
For Cb = 400pF, max is about
2kΩ.
For Cb = 40pF, max is about
15kΩ
kΩ
7
NOTES:
2. IRQ Inactive.
3. Specified at T_A =+25°C.
4. F_SCL = 400kHz.
5. In order to ensure proper timekeeping, the V_{DD SR-} specification must be followed.
6. Parameter is not 100% tested.
7. These are I²C specific parameters and are not tested, however, they are used to set conditions for testing devices to validate specification.
8. Parts are 100% tested at +25°C. Over-temperature limits established by characterization and are not production tested.
SDA vs SCL Timing
t_F
t_HIGH
SCL
t_SU:STA
SDA
(INPUT TIMING)
t_SU:DAT
t_HD:STA
SDA
(OUTPUT TIMING)
t_LOW
t_R
t_HD:DAT
t_AA
t_DH
t_SU:STO
t_BUF
Symbol Table
WAVEFORM INPUTS
Must be steady
OUTPUTS
Will be steady
May change
from LOW
to HIGH
May change
from HIGH
to LOW
Don’t Care:
Changes Allowed
Will change
from LOW
to HIGH
Will change
from HIGH
to LOW
Changing:
State Not Known
N/A
Center Line is
High Impedance
EQUIVALENT AC OUTPUT LOAD CIRCUIT FOR V_DD = 5V
5.0V
SDA
AND
IRQ
1533Ω
FOR V_OL= 0.4V
AND I_OL = 3mA
100pF
FIGURE 1. STANDARD OUTPUT LOAD FOR TESTING THE
DEVICE WITH V_DD = 5.0V
5
FN6617.1
January 15, 2008