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2015-07-0033

PT0523-4

8/18/15

5

PI4MSD5V9542A

2 Channel I2C bus Multiplexer

with Interrupt Logic

I2C Interface Timing Requirements

Symbol

Parameter

STANDARD MODE

FAST MODE

UNIT

MIN

MAX

MIN

MAX

fscl

I2C clock frequency

0

100

0

400

kHz

I2C clock high time

4.7

1.3

μs

I2C clock low time

4

0.6

μs

I2C spike time

50

50

ns

I2C serial-data setup time

250

100

ns

I2C serial-data hold time

0

[1]

0

[1]

μs

tr

I2C input rise time

1000

300

ns

tf

I2C input fall time

300

300

ns

I2C bus free time between stop and start

4.7

1.3

μs

I2C start or repeated start condition setup

4.7

0.6

μs

I2C start or repeated start condition hold

4

0.6

μs

I2C stop condition setup

4

0.6

μs

Valid-data time (high to low)

[2]

SCL low to SDA output low valid

1

1

μs

Valid-data time (low to high)

[2]

SCL low to SDA output high valid

0.6

0.6

μs

Valid-data time of ACK condition

ACK signal from SCL low to SDA output low

1

1

μs

Cb

I2C bus capacitive load

400

400

pF

Notes:

[1] A device internally must provide a hold time of at least 300 ns for the SDA signal (referred to as the VIH min of the SCL

signal), in order to bridge the undefined region of the falling edge of SCL.

[2] Data taken using a 1-kΩ pullup resistor and 50-pF load Notes

Figure 2. Definition of timing on the I2C-bus