PCA9525D NXP [NXP Semiconductors], PCA9525D Datasheet - Page 3

• Manufacturer Part Number: PCA9525D
• Description: Simple 2-wire bus buffer
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
6. Pinning information
7. Functional description
PCA9525
Product data sheet
6.1 Pinning
6.2 Pin description
7.1 V
7.2 SCL_IN, SCL_OUT — clock signal inputs/outputs
Table 2.
Refer to
The power supply voltage for the PCA9525 may be any voltage in the range 2.7 V to
5.5 V. The IC supply must be common with the supply for the bus. Hysteresis on the ports
is a percentage of the IC’s power supply, hence noise margin considerations should be
taken into account when selecting an operating voltage.
The clock signal buffer is unidirectional, although the direction may be reversed under
control of the direction pin (DIR). In normal bus operations, for example the I
master device generates a unidirectional clock signal to the slave. For lowest cost, the
PCA9525 combines unidirectional buffering of the clock signal with a bidirectional buffer
for the data signal. Clock stretching is therefore not supported and slave devices that may
require clock stretching must be accommodated by the master adopting an appropriate
Symbol
EN
SCL_OUT
SCL_IN
V
DIR
SDA_IN
SDA_OUT
V
Fig 2.
SS
DD
DD
, V
SCL_OUT
SCL_IN
SS
Figure 1 “Block diagram of
V
Pin configuration for SO8
EN
SS
Pin description
— supply pins
1
2
3
4
All information provided in this document is subject to legal disclaimers.
Pin
1
2
3
4
5
6
7
8
PCA9525D
Rev. 1 — 25 February 2011
002aaf330
8
7
6
5
Description
enable
clock buffer, slave side
clock buffer, master side
supply ground
clock direction
data buffer, master side
data buffer, slave side
positive supply
V
SDA_OUT
SDA_IN
DIR
DD
PCA9525”.
Fig 3.
SCL_OUT
SCL_IN
V
EN
SS
Pin configuration for TSSOP8
1
2
3
4
PCA9525DP
Simple 2-wire bus buffer
002aaf331
PCA9525
© NXP B.V. 2011. All rights reserved.
8
7
6
5
2
C-bus, the
V
SDA_OUT
SDA_IN
DIR
DD
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