PDIUSBH12D datasheet(23/28 Pages) PHILIPS

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Philips Semiconductors

Product specification

PDIUSBH12

USB 2-port hub

1999 Jul 22

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

SCL and SDA rise time

0.3

µs

SCL and SDA fall time

0.1

µs

tSU;DAT

Data set-up time

100

tHD;DAT

Data hold time

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.

SV00756

SCL

SDA

PROTOCOL

tSU;STA

tLOW

tHIGH

1/fSCL

tBUF

tHD;STA

tSU;DAT

tHD;DAT

tVD:DAT

tSU;STO

BIT 0

LSB

(R/W)

ACKNOWLEDGE

(A)

STOP

CONDITION

(P)

START

CONDITION

(S)

BIT 7

MSB

(A7)

BIT 6

(A6)

Figure 4. I2C-bus timing diagram

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