PCA9546A datasheet(11/27 Pages) TI

Part #	PCA9546A

Description	4-CHANNEL I2C AND SMBus SWITCH WITH RESET FUNCTION

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Manufacturer	TI [Texas Instruments]

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PARAMETER MEASUREMENT INFORMATION

RL = 1 kΩ

VCC

CL = 50 pF

(See Note A)

tbuf

ticr

tsth

tsds

tsdh

ticf

ticr

tscl

tsch

tsts

tvd(ACK)

or tvdL

tvdH

0.3

× VCC

Stop

Condition

tsps

Repeat

Start

Condition

Start or Repeat

Start Condition

SCL

SDA

Start

Condition

(S)

Address

Bit 7

(MSB)

Data

Bit 0

(LSB)

Stop

Condition

(P)

Two Bytes for Complete

Device Programming

I2C PORT LOAD CONFIGURATION

VOLTAGE WAVEFORMS

ticf

Stop

Condition

(P)

tsp

DUT

SDn, SCn

0.7

× VCC

0.3

× VCC

0.7

× VCC

R/W

Bit 0

(LSB)

ACK

(A)

Data

Bit 7

(MSB)

Address

Bit 1

Address

Bit 6

ACK

(A)

BYTE

DESCRIPTION

I2C address + R/W

Control register data

1

2

PCA9546A

4-CHANNEL I2C AND SMBus SWITCH

WITH RESET FUNCTION

SCPS148E – OCTOBER 2005 – REVISED JANUARY 2008

A.

CL includes probe and jig capacitance.

B.

All input pulses are supplied by generators having the following characteristics: PRR

≤ 10 MHz, ZO = 50 Ω,

tr/tf ≤ 30 ns.

C.

The outputs are measured one at a time, with one transition per measurement.

Figure 10. I2C Interface Load Circuit, Byte Descriptions, and Voltage Waveforms

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