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DS90UH926Q
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Recommended Timing for the Serial Control Bus
Over 3.3V supply and temperature ranges unless otherwise specified.
Symbol
Parameter
Conditions
f_SCL
SCL Clock Frequency
Standard Mode
Fast Mode
t_LOW
SCL Low Period
Standard Mode
Fast Mode
t_HIGH
SCL High Period
Standard Mode
Fast Mode
t_HD;STA
Hold time for a start or a
repeated start condition
Figure 10
Standard Mode
Fast Mode
t_SU:STA
Set Up time for a start or a
repeated start condition
Figure 10
Standard Mode
Fast Mode
t_HD;DAT
Data Hold Time
Figure 10
Standard Mode
Fast Mode
t_SU;DAT
Data Set Up Time
Figure 10
Standard Mode
Fast Mode
t_SU;STO
Set Up Time for STOP
Condition, Figure 10
Standard Mode
Fast Mode
t_BUF
Bus Free Time
Standard Mode
Between STOP and START,
Figure 10
Fast Mode
t_r
SCL & SDA Rise Time,
Standard Mode
Figure 10
Fast Mode
t_f
SCL & SDA Fall Time,
Standard Mode
Figure 10
Fast mode
SNLS337J – OCTOBER 2010 – REVISED APRIL 2013
Min
Typ Max Units
0
100 kHz
0
400 kHz
4.7
µs
1.3
µs
4.0
µs
0.6
µs
4.0
µs
0.6
µs
4.7
µs
0.6
µs
0
3.45 µs
0
0.9
µs
250
ns
100
ns
4.0
µs
0.6
µs
4.7
µs
1.3
µs
1000 ns
300
ns
300
ns
300
ns
DC and AC Serial Control Bus Characteristics
Over 3.3V supply and temperature ranges unless otherwise specified.^(1)(2)(3)
Symbol
Parameter
Conditions
V_IH
Input High Level
SDA and SCL
V_IL
Input Low Level Voltage
SDA and SCL
V_HY
V_OL
I_in
t_R
t_F
t_SU;DAT
t_HD;DAT
t_SP
C_in
Input Hysteresis
SDA RiseTime – READ
SDA Fall Time – READ
Set Up Time — READ
Hold Up Time — READ
Input Filter
Input Capacitance
SDA, IOL = 1.25mA
SDA or SCL, Vin = V_DD33 or GND
SDA, RPU = 10kΩ, Cb ≤ 400pF, Figure 10
SeeFigure 10
SeeFigure 10
SDA or SCL
Min
0.7*
V_DD33
GND
0
-10
Typ Max Units
V_DD33
V
0.3*
V_DD33
V
>50
mV
0.36
V
+10 µA
430
ns
20
ns
560
ns
615
ns
50
ns
<5
pF
(1) The Electrical Characteristics tables list ensured specifications under the listed Recommended Operating Conditions except as
otherwise modified or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and
are not ensured.
(2) Typical values represent most likely parametric norms at V_DD = 3.3V, Ta = +25 degC, and at the Recommended Operation Conditions at
the time of product characterization and are not ensured.
(3) Current into device pins is defined as positive. Current out of a device pin is defined as negative. Voltages are referenced to ground
except VOD and ΔVOD, which are differential voltages.
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