ISL12025 Datasheet, PDF (5/27 Pages) Intersil Corporation – Real-Time Clock/Calendar with I2C Bus and EEPROM

ISL12025
Serial Interface (I²C) Specifications (Continued)
SYMBOL
PARAMETER
CONDITIONS
MIN
MAX
(Note 12) TYP (Note 12) UNITS NOTES
t_LOW Clock LOW Time
Measured at the 30% of V_DD
1300
ns
crossing.
t_HIGH Clock HIGH Time
Measured at the 70% of V_DD
600
ns
crossing.
t_SU:STA START Condition Set-up Time
SCL rising edge to SDA falling
600
edge. Both crossing 70% of V_DD.
t_HD:STA START Condition Hold Time
From SDA falling edge crossing
600
30% of V_DD to SCL falling edge
crossing 70% of V_DD.
t_SU:DAT Input Data Set-up Time
From SDA exiting the 30% to 70% 100
of V_DD window, to SCL rising edge
crossing 30% of V_DD.
t_HD:DAT Input Data Hold Time
From SCL falling edge crossing
0
70% of V_DD to SDA entering the
30% to 70% of V_DD window.
t_SU:STO STOP Condition Set-up Time
From SCL rising edge crossing
600
70% of V_DD, to SDA rising edge
crossing 30% of V_DD.
t_HD:STO STOP Condition Hold Time for
From SDA rising edge to SCL
600
Read or Volatile Only Write
falling edge. Both crossing 70% of
V_DD.
t_DH Output Data Hold Time
From SCL falling edge crossing
0
30% of V_DD, until SDA enters the
30% to 70% of V_DD window.
Cpin SDA and SCL Pin Capacitance
ns
ns
ns
ns
ns
ns
ns
10
pF
t_WC Non-Volatile Write Cycle Time
t_R
SDA and SCL Rise Time
From 30% to 70% of V_DD
12
20
ms
10
20 +
0.1xCb
250
ns
11
t_F
SDA and SCL Fall Time
From 70% to 30% of V_DD
20 +
0.1xCb
250
ns
11
Cb Capacitive loading of SDA or SCL Total on-chip and off-chip
10
400
pF
11
R_PU SDA and SCL Bus Pull-up Resistor Maximum is determined by t_R and
1
Off-chip
t_F.
For Cb = 400pF, max is about
2kΩ~2.5kΩ.
For Cb = 40pF, max is about
15kΩ~20kΩ
kΩ
11
NOTES:
3. RESET Inactive (no reset).
4. V_IL = V_DD x 0.1, V_IH = V_DD x 0.9, f_SCL = 400kHz.
5. V_RESET = 2.63V (VDD must be greater than V_RESET), V_BAT = 0V.
6. Bit BSW = 0 (Standard Mode), ATR=00h, V_BAT ≥1.8V.
7. Specified at +25°C.
8. In order to ensure proper timekeeping, the V_{DD SR-} specification must be followed.
9. Parameter is not 100% tested.
10. t_WC is the minimum cycle time to be allowed for any non-volatile Write by the user (it is the time from valid STOP condition at the end of Write
sequence of a serial interface Write operation) to the end of the self-timed internal non-volatile write cycle.
11. These are I²C specific parameters and are not directly tested, however they are used during device testing to validate device specification.
12. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by
characterization and are not production tested.
5
FN6371.3
August 13, 2008