Datasheet

DS90UH926Q
www.ti.com
SNLS337J OCTOBER 2010REVISED APRIL 2013
Recommended Timing for the Serial Control Bus
Over 3.3V supply and temperature ranges unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Units
f
SCL
Standard Mode 0 100 kHz
SCL Clock Frequency
Fast Mode 0 400 kHz
t
LOW
Standard Mode 4.7 µs
SCL Low Period
Fast Mode 1.3 µs
t
HIGH
Standard Mode 4.0 µs
SCL High Period
Fast Mode 0.6 µs
t
HD;STA
Hold time for a start or a Standard Mode 4.0 µs
repeated start condition
Fast Mode 0.6 µs
Figure 10
t
SU:STA
Set Up time for a start or a Standard Mode 4.7 µs
repeated start condition
Fast Mode 0.6 µs
Figure 10
t
HD;DAT
Standard Mode 0 3.45 µs
Data Hold Time
Figure 10
Fast Mode 0 0.9 µs
t
SU;DAT
Standard Mode 250 ns
Data Set Up Time
Figure 10
Fast Mode 100 ns
t
SU;STO
Standard Mode 4.0 µs
Set Up Time for STOP
Condition, Figure 10
Fast Mode 0.6 µs
t
BUF
Bus Free Time Standard Mode 4.7 µs
Between STOP and START,
Fast Mode 1.3 µs
Figure 10
t
r
Standard Mode 1000 ns
SCL & SDA Rise Time,
Figure 10
Fast Mode 300 ns
t
f
Standard Mode 300 ns
SCL & SDA Fall Time,
Figure 10
Fast mode 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 Min Typ Max Units
V
IH
Input High Level SDA and SCL 0.7*
V
DD33
V
V
DD33
V
IL
Input Low Level Voltage SDA and SCL 0.3*
GND V
V
DD33
V
HY
Input Hysteresis >50 mV
V
OL
SDA, IOL = 1.25mA 0 0.36 V
I
in
SDA or SCL, Vin = V
DD33
or GND -10 +10 µA
t
R
SDA RiseTime – READ 430 ns
SDA, RPU = 10k, Cb 400pF, Figure 10
t
F
SDA Fall Time – READ 20 ns
t
SU;DAT
Set Up Time — READ SeeFigure 10 560 ns
t
HD;DAT
Hold Up Time — READ SeeFigure 10 615 ns
t
SP
Input Filter 50 ns
C
in
Input Capacitance SDA or SCL <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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