PDIUSBH11 datasheet(22/26 Pages) PHILIPS

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Philips Semiconductors

Product specification

PDIUSBH11

Universal Serial Bus Hub

1997 Aug 01

AC CHARACTERISTICS (I2C)

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

LIMITS

UNIT

SYMBOL

PARAMETER

MIN

TYP

MAX

UNIT

I2C-bus timing (see Figure ; Note )

fSCL

SCL clock frequency

–

100

kHZ

tSP

Tolerable spike width on bus

–

100

tBUF

Bus free time

4.7

–

µs

tSU;STA

Start condition set-up time

4.7

–

µs

tHD;STA

Start condition hold time

4.0

–

µs

tLOW

SCL LOW time

4.7

–

µs

tHIGH

SCL HIGH time

4.0

–

µs

SCL and SDA rise times

–

1.0

µs

SCL and SDA fall times

–

0.3

µs

tSU;DAT

Data set-up time

250

–

tHD;DAT

Data hold time

–

tVD;DAT

SCL LOW to data out valid

–

3.4

µs

tSU;STO

Stop condition set-up time

4.0

–

µs

1. A detailed description of the I2C-bus specification, with applications, is given in brochure ‘‘

The I2C-bus and how to use it”. This brochure

may be ordered using the code 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; rise and fall times refer to VIL and VIH

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