PCA9511ADR2G Просмотр технического описания (PDF) - ON Semiconductor

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PCA9511ADR2G

Hot Swappable I2C-Bus and SMBus Bus Buffer

ON Semiconductor 

PCA9511A

(1) Unshaded area indicates recommended pull−up, for rise time < 300 ns, with PCA9511A.

(2) Rise time without PCA9511A.

Figure 4. Bus Requirements for 3.3 V Systems

(1) Unshaded area indicates recommended pull−up, for rise time < 300 ns, with PCA9511A.

(2) Rise time without PCA9511A.

Figure 5. Bus Requirements for 5 V Systems

Hot Swapping and Capacitance Buffering Application

Figures 6 through 9 illustrate the usage of the PCA9511A

in applications that take advantage of both its hot swapping

and capacitance buffering features. In all of these

applications, note that if the I/O cards were plugged directly

into the backplane, all of the backplane and card

capacitances would add directly together, making rise time

and fall time requirements difficult to meet. Placing a bus

buffer on the edge of each card, however, isolates the card

capacitance from the backplane. For a given I/O card, the

PCA9511A drives the capacitance of everything on the card

and the backplane must drive only the capacitance of the bus

buffer, which is less than 10 pF, the connector, trace, and all

additional cards on the backplane.

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