Datasheet

DS90UR905Q, DS90UR906Q
www.ti.com SNLS313G –SEPTEMBER 2009–REVISED 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
SCL Clock Frequency Standard Mode >0 100 kHz
Fast Mode >0 400 kHz
t
LOW
SCL Low Period Standard Mode 4.7 us
Fast Mode 1.3 us
t
HIGH
SCL High Period Standard Mode 4.0 us
Fast Mode 0.6 us
t
HD;STA
Hold time for a start or a Standard Mode 4.0 us
repeated start condition,
Fast Mode
0.6 us
Figure 18
t
SU:STA
Set Up time for a start or a Standard Mode 4.7 us
repeated start condition,
Fast Mode
0.6 us
Figure 18
t
HD;DAT
Data Hold Time, Standard Mode 0 3.45 us
Figure 18
Fast Mode 0 0.9 us
t
SU;DAT
Data Set Up Time, Standard Mode 250 ns
Figure 18
Fast Mode 100 ns
t
SU;STO
Set Up Time for STOP Standard Mode 4.0 us
Condition, Figure 18
Fast Mode 0.6 us
t
BUF
Bus Free Time Between STOP Standard Mode 4.7 us
and START, Figure 18
Fast Mode 1.3 us
t
r
SCL & SDA Rise Time, Standard Mode 1000 ns
Figure 18
Fast Mode 300 ns
t
f
SCL & SDA Fall Time, Standard Mode 300 ns
Figure 18
Fast mode 300 ns
DC and AC Serial Control Bus Characteristics
Over 3.3V supply and temperature ranges unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Units
V
IH
Input High Level SDA and SCL 2.2 V
DDIO
V
V
IL
Input Low Level Voltage SDA and SCL GND 0.8 V
V
HY
Input Hysteresis >50 mV
V
OL
Output Low Level Voltage
(1)
SDA, IOL = 1.25mA 0 0.4 V
I
in
SDA or SCL, Vin = V
DDIO
or GND -15 +15 µA
t
R
SDA RiseTime – READ 40 ns
SDA, RPU = 10kΩ, Cb ≤ 400pF
t
F
SDA Fall Time – READ 25 ns
t
SU;DAT
Set Up Time — READ 520 ns
t
HD;DAT
Hold Up Time — READ 55 ns
t
SP
Input Filter 50 ns
C
in
Input Capacitance SDA or SCL <5 pF
(1) Specification is ensured by characterization and is not tested in production.
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