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PCA9548A

NXP
Part Number PCA9548A
Manufacturer NXP
Description 8-channel I2C switch
Published Sep 24, 2005
Detailed Description PCA9548A 8-channel I2C switch with reset Rev. 01 — 15 April 2005 Product data sheet 1. General description The PCA9548A...
Datasheet PDF File PCA9548A PDF File

PCA9548A
PCA9548A

Overview
PCA9548A 8-channel I2C switch with reset Rev.
01 — 15 April 2005 Product data sheet 1.
General description The PCA9548A is an octal bi-directional translating switch controlled via the I2C-bus.
The SCL/SDA upstream pair fans out to eight downstream pairs, or channels.
Any individual SCx/SDx channel or combination of channels can be selected, determined by the contents of the programmable control register.
An active LOW reset input allows the PCA9548A to recover from a situation where one of the downstream I2C-buses is stuck in a LOW state.
Pulling the RESET pin LOW resets the I2C-bus state machine and causes all the channels to be deselected as does the internal Power-on reset function.
The pass gates of the switches are constructed such that the VDD pin can be used to limit the maximum high voltage which will be passed by the PCA9548A.
This allows the use of different bus voltages on each pair, so that 1.
8 V or 2.
5 V or 3.
3 V parts can communicate with 5 V parts without any additional protection.
External pull-up resistors pull the bus up to the desired voltage level for each channel.
All I/O pins are 5 V tolerant.
2.
Features s s s s s s s s s s s s s s s 1-of-8 bi-directional translating switches I2C-bus interface logic; compatible with SMBus standards Active LOW reset input 3 address pins allowing up to 8 devices on the I2C-bus Channel selection via I2C-bus, in any combination Power-up with all switch channels deselected Low Ron switches Allows voltage level translation between 1.
8 V, 2.
5 V, 3.
3 V and 5 V buses No glitch on power-up Supports hot insertion Low stand-by current Operating power supply voltage range of 2.
3 V to 5.
5 V 5 V tolerant inputs 0 Hz to 400 kHz clock frequency ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115, and 1000 V CDM per JESD22-C101 s Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA s Three packages offered: SO24, TSSOP24, and HVQFN24 Philips Semiconductors PCA9548A 8-channel I2C sw...


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