4
FN6690.1
September 26, 2008
f
SCL
SCL Frequency 400 kHz
t
IN
Pulse width Suppression Time at SDA and
SCL Inputs
Any pulse narrower than the max
spec is suppressed.
50 ns
t
AA
SCL Falling Edge to SDA Output Data Valid SCL falling edge crossing 30% of
V
DD
, until SDA exits the 30% to
70% of V
DD
window.
900 ns
t
BUF
Time the Bus Must be Free Before the Start
of a New Transmission
SDA crossing 70% of V
DD
during
a STOP condition, to SDA
crossing 70% of V
DD
during the
following START condition.
1300 ns
t
LOW
Clock LOW Time Measured at the 30% of V
DD
crossing.
1300 ns
t
HIGH
Clock HIGH Time Measured at the 70% of V
DD
crossing.
600 ns
t
SU:STA
START Condition Setup Time SCL rising edge to SDA falling
edge. Both crossing 70% of V
DD
.
600 ns
t
HD:STA
START Condition Hold Time From SDA falling edge crossing
30% of V
DD
to SCL falling edge
crossing 70% of V
DD
.
600 ns
t
SU:DAT
Input Data Setup Time From SDA exiting the 30% to 70%
of V
DD
window, to SCL rising edge
crossing 30% of V
DD.
100 ns
t
HD:DAT
Input Data Hold Time From SCL falling edge crossing
30% of V
DD
to SDA entering the
30% to 70% of V
DD
window.
20 900 ns
t
SU:STO
STOP Condition Setup Time From SCL rising edge crossing
70% of V
DD
, to SDA rising edge
crossing 30% of V
DD
.
600 ns
t
HD:STO
STOP Condition Hold Time From SDA rising edge to SCL
falling edge. Both crossing 70% of
V
DD
.
600 ns
t
DH
Output Data Hold Time From SCL falling edge crossing
30% of V
DD
, until SDA enters the
30% to 70% of V
DD
window.
0ns
t
R
SDA and SCL Rise Time From 30% to 70% of V
DD
20 +
0.1 x Cb
300 ns 6, 7
t
F
SDA and SCL Fall Time From 70% to 30% of V
DD
20 +
0.1 x Cb
300 ns 6, 7
Cb Capacitive Loading of SDA or SCL Total on-chip and off-chip 10 400 pF 6, 7
Rpu SDA and SCL Bus Pull-Up Resistor Off-Chip Maximum is determined by t
R
and t
F
.
For Cb = 400pF, max is about
2kΩ to~2.5kΩ.
For Cb = 40pF, max is about 15kΩ
to ~20kΩ.
1kΩ 6, 7
NOTES:
2. FT/OUT inactive.
3. LPMODE = 0 (default).
4. In order to ensure proper timekeeping, the V
DD SR-
specification must be followed.
5. Typical values are for T = +25°C and 3.3V supply voltage.
6. Limits should be considered typical and are not production tested.
7. These are I
2
C specific parameters and are not tested, however, they are used to set conditions for testing devices to validate specification.
8. 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.
Serial Interface Specifications Recommended Operating Conditions. Unless otherwise specified. (Continued)
SYMBOL PARAMETER TEST CONDITIONS
MIN
(Note 8)
TYP
(Note 5)
MAX
(Note 8) UNITS NOTES
ISL12008
