Philips Semiconductors

Product data sheet

PCA9516A

2004 Sep 29

4

BLOCK DIAGRAM

HUB

LOGIC

SCL4

SCL0

SW02248

SCL1

SCL2

EN1

BUFFER

SCL3

HUB

LOGIC

SDA4

SDA0

SDA1

SDA2

SDA3

PCA9516A

EN2

EN4

EN3

GND

BUFFER

BUFFER

BUFFER

BUFFER

BUFFER

BUFFER

BUFFER

BUFFER

BUFFER

Figure 2. Block Diagram: PCA9516A

A more detailed view of Figure 2 buffer is shown in Figure 3.

SW00712

Data

Enable

To output

In

z

Inc

Figure 3.

The output pull-down of each internal buffer is set for approximately

0.5 V, while the input threshold of each internal buffer is set about

0.07 V lower, when the output is internally driven LOW. This

prevents a lock-up condition from occurring.