www.ti.com

RESET Input

Power-On Reset

Voltage Translation

2

Maximum

Typical

Minimum

4.5

4

3.5

3

2.5

5

5.5

1

5

4.5

4

3.5

3

2.5

2

1.5

PCA9546A

WITH RESET FUNCTION

SCPS148E – OCTOBER 2005 – REVISED JANUARY 2008

B7

B6

B5

B4

B3

B2

B1

B0

COMMAND

0

Channel 0 disabled

X

X

X

X

X

X

X

1

Channel 0 enabled

0

Channel 1 disabled

X

X

X

X

X

X

X

1

Channel 1 enabled

0

Channel 2 disabled

X

X

X

X

X

X

X

1

Channel 2 enabled

0

Channel 3 disabled

X

X

X

X

X

X

X

1

Channel 3 enabled

No channel selected,

0

0

0

0

0

0

0

0

power-up/reset default state

(1)

Several channels can be enabled at the same time. For example, B3 =0, B2 = 1, B1 = 1, B0 = 0 means that channels 0 and 3 are

disabled, and channels 1 and 2 are enabled. Care should be taken not to exceed the maximum bus capacity.

The RESET input is an active-low signal that may be used to recover from a bus-fault condition. When this signal

be lowered below 0.2 V to reset the device.

Figure 3 shows the voltage characteristics of the pass-gate transistors (note that the graph was generated using

the data specified in the electrical characteristics section of this data sheet). In order for the PCA9546A to act as

PCA9546A supply voltage is 3.5 V or lower, so the PCA9546A supply voltage could be set to 3.3 V. Pullup

resistors then can be used to bring the bus voltages to their appropriate levels (see Figure 12).

Copyright © 2005–2008, Texas Instruments Incorporated

Submit Documentation Feedback

5

Product Folder Link(s): PCA9546A