PDIUSBH12D データシートの表示（PDF） - Philips Electronics
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PDIUSBH12D Datasheet PDF : 28 Pages
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Philips Semiconductors
USB 2-port hub
Product specification
PDIUSBH12
AC CHARACTERISTICS (I2C pins)
All timing values are valid within the operating supply voltage and ambient temperature range and reference to VIL and VIH with an input voltage
swing of VSS and VDD.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
MAX
UNIT
fSCL
SCL clock frequency
1000
kHz
tBUF
Bus free time
0.5
µs
tSU;STA Start condition set-up time
0.25
µs
tHD;STA Start condition hold time
0.25
µs
tLOW
SCL LOW time
0.45
µs
tHIGH
SCL HIGH time
0.45
µs
tr
SCL and SDA rise time
0.3
µs
tf
SCL and SDA fall time
0.1
µs
tSU;DAT Data set-up time
100
ns
tHD;DAT Data hold time
0
ns
tVD;DAT SCL LOW to data out valid
0.4
µs
tSU;STO Stop condition set-up time
0.25
µs
A detailed description of the I2C-bus specification, with applications, is given in the brochure “The I2C-bus and how to use it”. This brochure may
be ordered using the Philips order number 9398 393 40011.
PROTOCOL
START
CONDITION
(S)
BIT 7
MSB
(A7)
BIT 6
(A6)
BIT 0
LSB
(R/W)
ACKNOWLEDGE
(A)
STOP
CONDITION
(P)
tSU;STA
SCL
SDA
tBUF
tLOW
tHIGH
1/fSCL
tr
tf
tHD;STA
tSU;DAT
tHD;DAT
tVD:DAT
Figure 4. I2C-bus timing diagram
tSU;STO
SV00756
1999 Jul 22
23
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