ISL12057 Datasheet, PDF (5/17 Pages) Intersil Corporation – Low Cost and Low Power I2C RTC Real Time Clock/Calendar

ISL12057
Serial Interface Specifications Over the recommended operating conditions unless otherwise specified. (Continued)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
(Note 6)
TYP
MAX
(Note 5) (Note 6) UNITS NOTES
t_BUF Time the Bus Must Be Free
SDA crossing 70% of V_DD during a
1300
ns
Before the Start of a New
STOP condition, to SDA crossing 70%
Transmission
of V_DD during the following START
condition
t_LOW
t_HIGH
t_SU:STA
t_HD:STA
t_SU:DAT
t_HD:DAT
t_SU:STO
t_HD:STO
t_DH
t_R
t_F
Cb
Clock LOW Time
Measured at the 30% of V_DD crossing
Clock HIGH Time
Measured at the 70% of V_DD crossing
START Condition Setup Time
SCL rising edge to SDA falling edge.
Both crossing 70% of V_DD
START Condition Hold Time
From SDA falling edge crossing 30% of
V_DD to SCL falling edge crossing 70%
of V_DD
Input Data Setup Time
From SDA exiting the 30% to 70% of
V_DD window, to SCL rising edge
crossing 30% of V_DD
Input Data Hold Time
From SCL falling edge crossing 30% of
V_DD to SDA entering the 30% to 70%
of V_DD window
STOP Condition Setup Time
From SCL rising edge crossing 70% of
V_DD, to SDA rising edge crossing 30%
of V_DD
STOP Condition Hold Time
From SDA rising edge to SCL falling
edge. Both crossing 70% of V_DD
Output Data Hold Time
From SCL falling edge crossing 30% of
V_DD, until SDA enters the 30% to 70%
of V_DD window
SDA and SCL Rise Time
From 30% to 70% of V_DD
SDA and SCL Fall Time
From 70% to 30% of V_DD
Capacitive Loading of SDA or SCL Total on-chip and off-chip
1300
600
600
600
100
0
600
600
0
20 + 0.1 x Cb
20 + 0.1 x Cb
10
ns
ns
ns
ns
ns
900
ns
ns
ns
ns
300
ns
7, 8
300
ns 7, 8, 9
400
pF
7, 8
Rpu SDA and SCL Bus Pull-Up
Maximum is determined by t_R and t_F
1
Resistor Off-Chip
For Cb = 400pF, max is about
2kΩ to~2.5kΩ.
For Cb = 40pF, max is about 15kΩ to
~20kΩ
kΩ 7, 8
NOTES:
4. IRQ1/F_OUT inactive.
5. Typical values are for T = +25°C and 3.3V supply voltage.
6. 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.
7. Limits should be considered typical and are not production tested.
8. These are I²C specific parameters and are not production tested, however, they are used to set conditions for testing devices to validate
specification.
9. Parts will work with SDA pull-up voltage above the V_PULLUP limit but the t_AA and t_Fin the I²C parameters are not guaranteed.
10. Specified at +25°C.
5
FN6755.0
June 15, 2009