Datasheet
DS90UB903Q, DS90UB904Q
SNLS332E –JUNE 2010–REVISED APRIL 2013
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Bidirectional Control Bus AC Timing Specifications (SCL, SDA) - I
2
C Compliant
Over recommended supply and temperature ranges unless otherwise specified. See Figure 4.
Symbol Parameter Conditions Min Typ Max Units
RECOMMENDED INPUT TIMING REQUIREMENTS
(1)
f
SCL
SCL Clock Frequency >0 100 kHz
t
LOW
SCL Low Period 4.7 µs
t
HIGH
SCL High Period 4.0 µs
Hold time for a start or a repeated start
t
HD:STA
4.0 µs
condition
Set Up time for a start or a repeated
t
SU:STA
4.7 µs
start condition
f
SCL
= 100 kHz
t
HD:DAT
Data Hold Time 0 3.45 µs
t
SU:DAT
Data Set Up Time 250 ns
t
SU:STO
Set Up Time for STOP Condition 4.0 µs
t
r
SCL & SDA Rise Time 1000 ns
t
f
SCL & SDA Fall Time 300 ns
C
b
Capacitive load for bus 400 pF
SWITCHING CHARACTERISTICS
(2)
Serializer MODE = 0 – R/W
100
Register 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
t
HD:STA
4.0 µs
condition Register 0x05 = 0x40'h
Set Up time for a start or a repeated Serializer MODE = 0
t
SU:STA
4.7 µs
start condition Register 0x05 = 0x40'h
t
HD:DAT
Data Hold Time 0 3.45 µs
t
SU:DAT
Data Set Up Time 250 ns
t
SU:STO
Set Up Time for STOP Condition Serializer MODE = 0 4.0 µs
t
f
SCL & SDA Fall Time 300 ns
Bus free time between a stop and start
t
BUF
Serializer MODE = 0 4.7 µs
condition
Serializer MODE = 1 1
t
TIMEOUT
NACK Time out ms
Deserializer MODE = 1
25
Register 0x06 b[2:0]=111'b
(1) Recommended Input Timing Requirements are input specifications and not tested in production.
(2) Specification is ensured by design.
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