TCA9546A

現行

具重設和電壓轉換的 4 通道 1.65 至 5.5-V I2C/SMBus 開關

立即訂購

產品規格表

document-pdfAcrobat TCA9546A Low Voltage 4-Channel I2C and SMBus Switch with Reset Function datasheet (Rev. B) (英文) PDF | HTML

TCA9546A

現行

產品規格表

立即訂購

產品詳細資料

Addresses

8

Features

Reset pin

Rating

Catalog

Frequency (max) (MHz)

0.4

Operating temperature range (°C)

-40 to 85

Number of channels

4

Addresses

8

Features

Reset pin

Rating

Catalog

Frequency (max) (MHz)

0.4

Operating temperature range (°C)

-40 to 85

Number of channels

4

SOIC (D)

16

59.4 mm² (9.9 mm × 6 mm)

TSSOP (PW)

16

32 mm² (5 mm × 6.4 mm)

1-of-4 Bidirectional translating switches
I²C Bus and SMBus compatible
Active-low reset input
Three address pins, allowing up to eight TCA9546A devices on the I²C bus
Channel selection via 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 of 1.65 V to 5.5 V
5.5 V Tolerant inputs
0 to 400-kHz Clock frequency
Latch-up performance exceeds 100 mA Per JESD 78
ESD Protection exceeds JESD 22
- 4000-V Human-body model (A114-A)
- 1500-V Charged-device model (C101)

1-of-4 Bidirectional translating switches
I²C Bus and SMBus compatible
Active-low reset input
Three address pins, allowing up to eight TCA9546A devices on the I²C bus
Channel selection via 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 of 1.65 V to 5.5 V
5.5 V Tolerant inputs
0 to 400-kHz Clock frequency
Latch-up performance exceeds 100 mA Per JESD 78
ESD Protection exceeds JESD 22
- 4000-V Human-body model (A114-A)
- 1500-V Charged-device model (C101)

The TCA9546A is a quad bidirectional translating switch controlled via the I²C bus. The SCL/SDA upstream pair fans out to four 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.

An active-low reset (RESET) input allows the TCA9546A to recover from a situation in which one of the downstream I²C buses is stuck in a low state. Pulling RESET low resets the I²C 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 VCC pin can be used to limit the maximum high voltage, which will be passed by the TCA9546A. 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 5.5-V tolerant.

The TCA9546A is a quad bidirectional translating switch controlled via the I²C bus. The SCL/SDA upstream pair fans out to four 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.

An active-low reset (RESET) input allows the TCA9546A to recover from a situation in which one of the downstream I²C buses is stuck in a low state. Pulling RESET low resets the I²C 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 VCC pin can be used to limit the maximum high voltage, which will be passed by the TCA9546A. 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 5.5-V tolerant.

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重要文件	類型	標題	格式選項	日期
*	資料表	TCA9546A Low Voltage 4-Channel I2C and SMBus Switch with Reset Function datasheet (Rev. B)	PDF \| HTML	2019/10/29
	Application brief	Best Practices: I2C Devices on an I3C Shared Bus	PDF \| HTML	2023/3/30
	應用說明	I2C Solutions for Hot Swap Applications (Rev. A)		2023/1/31
	應用說明	I2C Dynamic Addressing		2019/4/25
	應用說明	Choosing the Correct I2C Device for New Designs	PDF \| HTML	2016/9/7
	選擇指南	I2C Infographic Flyer		2015/12/3
	應用說明	Understanding the I2C Bus	PDF \| HTML	2015/6/30
	應用說明	Maximum Clock Frequency of I2C Bus Using Repeaters		2015/5/15
	應用說明	I2C Bus Pull-Up Resistor Calculation	PDF \| HTML	2015/2/13

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