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Hub

Logic

SCL4

SCL0

Buffer

SCL1

Buffer

SCL2

Buffer

EN1

Buffer

SCL3

Buffer

Hub

Logic

SDA4

SDA0

Buffer

SDA1

Buffer

SDA2

Buffer

Buffer

SDA3

Buffer

PCA9518

EN2

EN4

EN3

EXPSDA2

EXPSDA1

EXPSCL1

EXPSCL2

GND

Data

Enable

To Output

In

z

Inc

PCA9518

SCPS132A – JUNE 2006 – REVISED JULY 2007

FUNCTIONAL BLOCK DIAGRAM

A more detailed view of each buffer in the functional block diagram is shown in Figure 1.

Figure 1. Buffer Details

4

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