Philips Semiconductors

Product data sheet

PCA9515

2004 Jun 24

3

PCA9515

SDA1

SCL1

SCL0

SDA0

SU01323

PULL-UP

RESISTOR

EN

GND

Figure 2. PCA9515 block diagram

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.

FUNCTIONAL DESCRIPTION

The PCA9515 BiCMOS integrated circuit contains two identical

extended without degradation of system performance.

The PCA9515 BiCMOS integrated circuit contains two bi-directional,

open drain buffers specifically designed to support the standard

arbitration or clock stretching, the PCA9515 acts like a pair of

non-inverting, open drain buffers, one for SDA and one for SCL.

Enable

The EN pin is active high with an internal pull up and allows the user

to select when the repeater is active. This can be used to isolate a

badly behaved slave on power up until after the system power up

disabling during a bus operation will hang the bus and enabling part

The enable pin should only change state when the global bus and

the repeater port are in an idle state to prevent system failures.

provide the logic HIGH levels on the Buffered bus. (Standard

pull-up resistors depends on the system, but each side of the

repeater must have a pull-up resistor. This part designed to work

where standard mode devices and multiple masters are possible.

Under certain conditions higher termination currents can be used.

Please see Application Note AN255

and Expanders” for additional information on sizing resistors and

precautions when using more than one PCA9515/PCA9516 in a

system or using the PCA9515/16 in conjunction with the P82B96.