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TCA9548APWR

8-channel 1.65- to 5.5-V I2C/SMBus switch with reset & voltage translation

Manufacturer:

TI
Mfr.Part #:

TCA9548APWR
Datasheet:

TCA9548APWR Datasheet (PDF)
Addresses:

8
Supply voltage (max) (V):

5.5
Supply voltage (min) (V):

1.65
Features:

Reset pin
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TCA9548APWR General Description

The TCA9548A 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 SCn/SDn 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 TCA9548A 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 one of the downstream I²C buses get stuck in a low state.

The pass gates of the switches are constructed so that the VCC pin can be used to limit the maximum high voltage, which is passed by the TCA9548A. Limiting the maximum high voltage 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 pullup resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5-V tolerant.

Key Features

1-to-8 Bidirectional translating switches
I²C Bus and SMBus compatible
Active-low reset input
Three address pins, allowing up to eight TCA9548A devices on the I²C bus
Channel selection through an I²C Bus, in any combination
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 of1.65 V to 5.5 V
5-V Tolerant inputs
0- 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)

Application

Communications & Networking

Specifications

Addresses	8	Supply voltage (max) (V)	5.5
Supply voltage (min) (V)	1.65	Features	Reset pin
Rating	Catalog	Frequency (max) (MHz)	0.4
Operating temperature range (°C)	-40 to 85	Number of channels	8
Product Category	Switch ICs - Various	Product	Bidirectional Translating Switches
Number of Switches	8 Switch	Configuration	-
On Resistance - Max	70 Ohms	Operating Supply Voltage	1.65 V to 5.5 V
Minimum Operating Temperature	- 40 C	Maximum Operating Temperature	+ 85 C
Mounting Style	SMD/SMT	Product Type	Switch ICs - Various
Series	TCA9548A	Factory Pack Quantity	2000
Subcategory	Switch ICs	Supply Current - Max	80 uA
Supply Voltage - Max	5.5 V	Supply Voltage - Min	1.65 V
Unit Weight	0.007408 oz