pca9548ad NXP Semiconductors, pca9548ad Datasheet
pca9548ad
Manufacturer Part Number
pca9548ad
Description
8-channel I2c Switch With Reset
Manufacturer
NXP Semiconductors
Datasheet
1.PCA9548AD.pdf
(25 pages)
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1. General description
2. Features
The PCA9548A is an octal bidirectional translating switch controlled via the I
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 I
I
Power-on reset function.
The pass gates of the switches are constructed such that the V
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.
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
2
C-bus state machine and causes all the channels to be deselected as does the internal
PCA9548A
8-channel I
Rev. 02 — 25 September 2006
1-of-8 bidirectional translating switches
I
Active LOW reset input
3 address pins allowing up to 8 devices on the I
Channel selection via I
Power-up with all switch channels deselected
Low R
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
Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
Three packages offered: SO24, TSSOP24, and HVQFN24
2
C-bus interface logic; compatible with SMBus standards
on
switches
2
C-buses is stuck in a LOW state. Pulling the RESET pin LOW resets the
2
C-bus switch with reset
2
C-bus, in any combination
2
C-bus
DD
pin can be used to limit
Product data sheet
2
C-bus. The
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