This website uses cookies. By using this site, you consent to the use of cookies. For more information, please take a look at our Privacy Policy.

Images are for reference only,

See Technical Specifications

PCA9548ADW

8-channel 2.3- to 5.5-V I2C/SMBus switch with reset & voltage translation

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

PCA9548ADW
Datasheet:

PCA9548ADW Datasheet (PDF)
Applications:

Translating Switch
Interface:

I²C, SMBus
Voltage - Supply:

2.3V ~ 5.5V
Mounting Type:

Surface Mount
EDA/CAD Models:

Request Free CAD Models for PCA9548ADW

Email: [email protected]

Skype: live:.cid.ab6b29428937b76

Tel: +852 95804164

PCA9548ADW General Description

The PCA9548A device has eight bidirectional translating switches that can be controlled through 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. These downstream channels can be used to resolve I²C slave address conflicts. For example, if eight identical digital temperature sensors are needed in the application, one sensor can be connected at each channel: 0-7.

The system master can reset the PCA9548A in the event of a time-out or other improper operation by asserting a low in the RESET input. Similarly, the power-on reset deselects all channels and initializes the I²C/SMBus state machine. Asserting RESET causes the same reset and initialization to occur without powering down the part. This allows recovery should once of the downstream I²C buses get stuck in a low state.

The pass gates of the switches are constructed so that the V_CC pin can be used to limit the maximum high voltage, which is passed by the PCA9548A. This allows the use of different bus voltages on each pair, so that 1.8-V, 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.

Key Features

1-of-8 Bidirectional Translating Switches
I²C Bus and SMBus Compatible
Active-Low Reset Input
Three Hardware Address Pins for Use of up to Eight PCA9548A Devices on the I²C Bus
Channel Selection Via I²C Bus
Power-Up with All Switch Channels Deselected
Low R_ON 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 Standby Current
Operating Power-Supply Voltage Range of 2.3 V to 5.5 V
5-V Tolerant Inputs
0-kHz to 400-kHz Clock Frequency
Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
ESD Protection Exceeds JESD 22
- 2000-V Human-Body Model (A114-A)
- 200-V Machine Model (A115-A)
- 1000-V Charged-Device Model (C101)

Specifications

Category	Integrated Circuits (ICs)InterfaceSpecialized	Series	-
Applications	Translating Switch	Interface	I²C, SMBus
Voltage - Supply	2.3V ~ 5.5V	Mounting Type	Surface Mount
Base Product Number	PCA9548