Datasheet
SCL
SDA
t
HD;STA
t
LOW
t
r
t
HD;DAT
t
HIGH
t
f
t
SU;DAT
t
SU;STA
t
SU;STO
t
f
START
REPEATED
START
STOP
t
HD;STA
START
t
SP
t
r
t
BUF
DS92LX2121, DS92LX2122
SNLS330I –MAY 2010–REVISED APRIL 2013
www.ti.com
Bi-Directional Control Bus AC Timing Specifications (SCL, SDA) - I
2
C Compliant
(Figure 5) (continued)
Over recommended operating supply and temperature ranges unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Units
SWITCHING CHARACTERISTICS ()
Serializer MODE = 0 – R/W Register
100
0x05 = 0x40'h
f
SCL
SCL Clock Frequency kHz
Deserializer MODE = 0 – READ
100
Register 0x06 b[6:4] = 0x00'h
Serializer MODE = 0 – R/W Register
0x05 = 0x40'h
t
LOW
SCL Low Period 4.7 μs
Deserializer MODE = 0 – READ
Register 0x06 b[6:4] = 0x00'h
Serializer MODE = 0 – R/W Register
0x05 = 0x40'h
t
HIGH
SCL High Period 4.0 μs
Deserializer MODE = 0 – READ
Register 0x06 b[6:4] = 0x00'h
Hold time for a start or a repeated start Serializer MODE = 0 Register 0x05
t
HD:STA
4.0 μs
condition = 0x40'h
Set Up time for a start or a repeated Serializer MODE = 0 Register 0x05
tSU:STA 4.7 μs
start condition = 0x40'h
t
HD:DAT
Data Hold Time 0 3.45 μs
t
SU:DAT
Data Set Up Time 250 μs
t
SU:STO
Set Up Time for STOP Condition Serializer M/S = 0 4.0 μs
t
f
SCL & SDA Fall Time 300 μs
Bus free time between a stop and start Serializer M/S = 0
t
BUF
4.7 µs
condition
Serializer 1
t
TIMEOUT
NACK Time out ms
Deserializer 25
Figure 5. Serial Control Bus Timing
Bi-Directional Control Bus DC Characteristics (SCL, SDA) - I
2
C Compliant
Symbol Parameter Conditions Min Typ Max Units
V
IH
Input High Level SDA and SCL 0.7 x
V
DDIO
V
V
DDIO
V
IL
Input Low Level Voltage SDA and SCL 0.3 x
GND V
V
DDIO
V
HY
Input Hysteresis >50 mV
I
OZ
TRI-STATE Output Current PDB = 0V VOUT = 0V or VDD -20 ±1 +20 µA
I
IN
Input Current SDA or SCL, Vin = V
DDIO
or GND -20 ±1 +20 µA
C
IN
Input Pin Capacitance <5 pF
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