ISL12027_10 Datasheet, PDF (6/28 Pages) Intersil Corporation – Real Time Clock/Calendar with EEPROM

ISL12027, ISL12027A
Serial Interface (I²C) Specifications (Continued)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS NOTES
t_SU:STA START Condition Set-up Time
t_HD:STA START Condition Hold Time
t_SU:DAT Input Data Set-up Time
t_HD:DAT Input Data Hold Time
t_SU:STO STOP Condition Set-up Time
t_HD:STO STOP Condition Hold Time for
Read, or Volatile Only Write
t_DH Output Data Hold Time
t_R
SDA and SCL Rise Time
SCL rising edge to SDA falling edge.
Both crossing 70% of V_DD.
From SDA falling edge crossing 30%
of V_DD to SCL falling edge crossing
70% of V_DD.
From SDA exiting the 30% to 70% of
V_DD window, to SCL rising edge
crossing 30% of V_DD.
From SCL falling edge crossing 70% of
V_DD to SDA entering the 30% to 70%
of V_DD window.
From SCL rising edge crossing 70% of
V_DD, to SDA rising edge crossing 30%
of V_DD.
From SDA rising edge to SCL falling
edge. Both crossing 70% of V_DD.
From SCL falling edge crossing 30% of
V_DD, until SDA enters the 30% to 70%
of V_DD window.
From 30% to 70% of V_DD
600
600
100
0
600
600
0
20 +
0.1xCb
ns
ns
ns
ns
ns
ns
ns
250
ns
t_F
SDA and SCL Fall Time
From 70% to 30% of V_DD
20 +
0.1xCb
250
ns
Cpin SDA, and SCL Pin Capacitance
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
14
20 +
0.1xCb
250
ns
15
t_F
SDA and SCL Fall Time
From 70% to 30% of V_DD
20 +
0.1xCb
250
ns
15
Cb Capacitive Loading of SDA or SCL Total on-chip and off-chip
10
400
pF
15
R_PU SDA and SCL Bus Pull-up Resistor Maximum is determined by t_R and t_F.
1
Off-chip
For Cb = 400pF, max is about
2kΩ~2.5kΩ.
For Cb = 40pF, max is about
15kΩ~20kΩ
kΩ
15
NOTES:
7. RESET Inactive (no reset).
8. V_IL = V_DD x 0.1, V_IH = V_DD x 0.9, f_SCL = 400kHz.
9. V_RESET = 2.63V (V_DD must be greater than V_RESET), V_BAT = 0V.
10. Bit BSW = 0 (Standard Mode), ATR = 00h, V_BAT ≥1.8V.
11. Specified at +25°C.
12. In order to ensure proper timekeeping, the V_{DD SR-} specification must be followed.
13. Parameter is not 100% tested.
14. 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.
15. These are I²C specific parameters and are not directly tested, however they are used during device testing to validate device specification.
16. 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.
6
FN8232.8
August 12, 2010