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I2C & I3C level shifters, buffers & hubs

TCA9800

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400 kHz I2C/SMBus-Puffer/Wiederholer mit 2-Bit-Pegelumsetzung und interner 0,5-mA-Stromquelle

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TCA9800

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Produktdetails

Features Buffer, Enable pin Protocols I2C Frequency (max) (MHz) 0.4 VCCA (min) (V) 0.8 VCCA (max) (V) 3.6 VCCB (min) (V) 1.65 VCCB (max) (V) 3.6 Supply restrictions No rule Rating Catalog Operating temperature range (°C) -40 to 125
Features Buffer, Enable pin Protocols I2C Frequency (max) (MHz) 0.4 VCCA (min) (V) 0.8 VCCA (max) (V) 3.6 VCCB (min) (V) 1.65 VCCB (max) (V) 3.6 Supply restrictions No rule Rating Catalog Operating temperature range (°C) -40 to 125
VSSOP (DGK) 8 14.7 mm² 3 x 4.9
  • Two-channel bidirectional buffer
  • Integrated current source on B-side, requires no external B-side resistors
  • Ultra-low power consumption
  • No static-voltage offset, low VOL
  • I2C bus and SMBus compatible
  • Operating supply voltage range of 0.8 V to 3.6 V on A-side
  • Operating supply voltage range of 1.65 V to 3.6 V on B-side
  • Active-high repeater enable input
  • Powered-off high impedance I2C bus pins on A-side
  • Powered-off back-power protection I2C bus pins
  • Support for clock stretching and multiple master arbitration
  • Family of current source options from 0.5 mA to 3 mA
  • Two-channel bidirectional buffer
  • Integrated current source on B-side, requires no external B-side resistors
  • Ultra-low power consumption
  • No static-voltage offset, low VOL
  • I2C bus and SMBus compatible
  • Operating supply voltage range of 0.8 V to 3.6 V on A-side
  • Operating supply voltage range of 1.65 V to 3.6 V on B-side
  • Active-high repeater enable input
  • Powered-off high impedance I2C bus pins on A-side
  • Powered-off back-power protection I2C bus pins
  • Support for clock stretching and multiple master arbitration
  • Family of current source options from 0.5 mA to 3 mA

The TCA9800 is a dual-channel bidirectional buffer intended for I2C bus and SMBus/PMBus systems. It provides bidirectional level shifting (up-translation and down-translation) between low voltages (down to 0.8 V) and higher voltages (1.65 V to 3.6 V). The TCA9800 features an internal current source on the B-side of the device, allowing the removal of external pull-up resistors on the B-side. The current source also provides an improved rise time and ultra-low power consumption.

The TCA9800 is able to provide true buffering (rather than a pass-FET solution) without using a static voltage offset or incremental offset. This means that the VOL on both the A and B sides of the TCA9800 are very low (approximately 0.2 V), helping to eliminate communication issues as a result of fixed VIL thresholds. Another key feature of the TCA9800 is that there are no power sequencing requirements, or power supply dependencies. VCCA can be greater than, less than, or equal to VCCB. This gives the system designer flexibility with how the TCA9800 is used.

The TCA9800 is part of a four device family with varying current source strengths (see the Device Comparison Table).

The TCA9800 is a dual-channel bidirectional buffer intended for I2C bus and SMBus/PMBus systems. It provides bidirectional level shifting (up-translation and down-translation) between low voltages (down to 0.8 V) and higher voltages (1.65 V to 3.6 V). The TCA9800 features an internal current source on the B-side of the device, allowing the removal of external pull-up resistors on the B-side. The current source also provides an improved rise time and ultra-low power consumption.

The TCA9800 is able to provide true buffering (rather than a pass-FET solution) without using a static voltage offset or incremental offset. This means that the VOL on both the A and B sides of the TCA9800 are very low (approximately 0.2 V), helping to eliminate communication issues as a result of fixed VIL thresholds. Another key feature of the TCA9800 is that there are no power sequencing requirements, or power supply dependencies. VCCA can be greater than, less than, or equal to VCCB. This gives the system designer flexibility with how the TCA9800 is used.

The TCA9800 is part of a four device family with varying current source strengths (see the Device Comparison Table).
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Technische Dokumentation

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Typ Titel Datum
* Data sheet TCA9800 Level-Translating I2C Bus Buffer/Repeater datasheet (Rev. B) PDF | HTML 13 Feb 2020
Application brief Best Practices: I2C Devices on an I3C Shared Bus PDF | HTML 30 Mär 2023
Application note Why, When, and How to use I2C Buffers 23 Mai 2018
Application note Advantages and Design Considerations of the TCA980x Family 30 Mär 2017
Application note Choosing the Correct I2C Device for New Designs PDF | HTML 07 Sep 2016
Selection guide I2C Infographic Flyer 03 Dez 2015
Application note Understanding the I2C Bus PDF | HTML 30 Jun 2015
Application note Maximum Clock Frequency of I2C Bus Using Repeaters 15 Mai 2015
Application note I2C Bus Pull-Up Resistor Calculation PDF | HTML 13 Feb 2015

Design und Entwicklung

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Evaluierungsplatine

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