CAT6095
http://onsemi.com
3
Table 4. A.C. CHARACTERISTICS (V
CC
= 3.3 V ?10%, T
A
= 40癈 to +125癈) (Note 3)
Symbol
Parameter
Min
Max
Units
F
SCL
(Note 4)
Clock Frequency
10
400
kHz
t
HIGH
High Period of SCL Clock
600
ns
t
LOW
Low Period of SCL Clock
1300
ns
t
TIMEOUT
(Note 4)
SMBus SCL Clock Low Timeout
25
35
ms
t
R
(Note 5)
SDA and SCL Rise Time
300
ns
t
F
(Note 5)
SDA and SCL Fall Time
300
ns
t
SU:DAT
(Note 6)
Data Setup Time
100
ns
t
HD:DAT
(Note 5)
Data Hold Time (for Input Data)
0
ns
Data Hold Time (for Output Data)
300
900
ns
t
SU:STA
START Condition Setup Time
600
ns
t
HD:STA
START Condition Hold Time
600
ns
t
SU:STO
STOP Condition Setup Time
600
ns
t
BUF
Bus Free Time Between STOP and START
1300
ns
T
i
Noise Pulse Filtered at SCL and SDA Inputs
100
ns
t
PU
(Note 7)
Powerup Delay to Valid Temperature Recording
100
ms
3. Timing reference points are set at 30%, respectively 70% of V
CC
, as illustrated in Figure 11. Bus loading must be such as to allow meeting
the V
IL
, V
OL
as well as the various timing limits.
4. The TS interface will reset itself and will release the SDA line if the SCL line stays low beyond the t
TIMEOUT
limit. The timeout count is started
(and then restarted) on every negative transition of SCL in the time interval between START and STOP.
5. In a WiredOR system (such as I
2
C or SMBus), SDA rise time is determined by bus loading. Since each bus pulldown device must be
able to sink the (external) bus pullup current (in order to meet the V
IL
and/or V
OL
limits), it follows that SDA fall time is inherently faster than
SDA rise time. SDA rise time can exceed the standard recommended t
R
limit, as long as it does not exceed t
LOW
t
HD:DAT
t
SU:DAT
, where
t
LOW
and t
HD:DAT
are actual values (rather than spec limits). A shorter t
HD:DAT
leaves more room for a longer SDA t
R
, allowing for a more
capacitive bus or a larger bus pullup resistor. At the minimum t
LOW
spec limit of 1300 ns, the maximum t
HD:DAT
of 900 ns demands a
maximum SDA t
R
of 300 ns. The CAT6095s maximum t
HD:DAT
is <700 ns, thus allowing for an SDA t
R
of up to 500 ns at minimum t
LOW
.
6. The minimum t
SU:DAT
of 100 ns is a limit recommended by standards. The TS will accept a t
SU:DAT
of 0 ns.
7. The first valid temperature recording can be expected after t
PU
at nominal supply voltage.
Table 5. PIN CAPACITANCE (T
A
= 25癈, V
CC
= 3.3 V, f = 1 MHz)
Symbol
Parameter
Test Conditions/Comments
Min
Max
Unit
C
IN
SDA, EVENT
Pin Capacitance
V
IN
= 0
8
pF
Input Capacitance (other pins)
V
IN
= 0
6
pF
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