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TCA9509

ACTIVE

2-bit level-translating 400-kHz I2C/SMBus buffer/repeater with internal 1-mA current source

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Data sheet

TCA9509

ACTIVE
Data sheet Order now

Product details

Features Buffer, Enable pin Protocols I2C Frequency (max) (MHz) 0.4 VCCA (min) (V) 0.9 VCCA (max) (V) 5.5 VCCB (min) (V) 2.7 VCCB (max) (V) 5.5 Supply restrictions VCCA <= (VCCB-1) Rating Catalog Operating temperature range (°C) -40 to 85
Features Buffer, Enable pin Protocols I2C Frequency (max) (MHz) 0.4 VCCA (min) (V) 0.9 VCCA (max) (V) 5.5 VCCB (min) (V) 2.7 VCCB (max) (V) 5.5 Supply restrictions VCCA <= (VCCB-1) Rating Catalog Operating temperature range (°C) -40 to 85
VSSOP (DGK) 8 14.7 mm² 3 x 4.9 X2QFN (RVH) 8 2.56 mm² 1.6 x 1.6
  • Two-channel bidirectional buffer
  • I2C bus and SMBus compatible
  • Operating supply voltage range of 2.7 V to 5.5 V on B side
  • Operating voltage range of 0.9 V to 5.5 V on A side
  • Voltage-level translation from 0.9 V to 5.5 V and 2.7 V to 5.5 V
  • Active-high repeater-enable input
  • Requires no external pullup resistors on lower-voltage port-A
  • Open-drain I2C I/O
  • 5.5-V Tolerant I2C and enable input support mixed-mode signal operation
  • Lockup-free operation
  • Accommodates standard mode and fast mode I2C devices and multiple controllers
  • Supports arbitration and clock stretching across Repeater
  • Powered-off high-impedance I2C bus pins
  • Supports 400-kHz fast I2C bus operating speeds
  • Available in
    • 1.6-mm × 1.6-mm, 0.4-mm height, 0.5-mm pitch QFN package
    • 3-mm × 3-mm Industry standard MSOP package
  • Latch-up performance exceeds 100 mA Per JESD 78, class II
  • ESD protection exceeds JESD 22
    • 2000-V Human-body model (A114-A)
    • 1000-V Charged-device model (C101)
  • Two-channel bidirectional buffer
  • I2C bus and SMBus compatible
  • Operating supply voltage range of 2.7 V to 5.5 V on B side
  • Operating voltage range of 0.9 V to 5.5 V on A side
  • Voltage-level translation from 0.9 V to 5.5 V and 2.7 V to 5.5 V
  • Active-high repeater-enable input
  • Requires no external pullup resistors on lower-voltage port-A
  • Open-drain I2C I/O
  • 5.5-V Tolerant I2C and enable input support mixed-mode signal operation
  • Lockup-free operation
  • Accommodates standard mode and fast mode I2C devices and multiple controllers
  • Supports arbitration and clock stretching across Repeater
  • Powered-off high-impedance I2C bus pins
  • Supports 400-kHz fast I2C bus operating speeds
  • Available in
    • 1.6-mm × 1.6-mm, 0.4-mm height, 0.5-mm pitch QFN package
    • 3-mm × 3-mm Industry standard MSOP package
  • Latch-up performance exceeds 100 mA Per JESD 78, class II
  • ESD protection exceeds JESD 22
    • 2000-V Human-body model (A114-A)
    • 1000-V Charged-device model (C101)

This TCA9509 integrated circuit is an I2C bus/SMBus Repeater for use in I2C/SMBus systems. It can also provide bidirectional voltage-level translation (up-translation/down-translation) between low voltages (down to 0.9 V) and higher voltages (2.7 V to 5.5 V) in mixed-mode applications. This device enables I2C and similar bus systems to be extended, without degradation of performance even during level shifting.

The TCA9509 buffers both the serial data (SDA) and the serial clock (SCL) signals on the I2C bus, thus allowing 400-pF bus capacitance on the B-side. This device can also be used to isolate two halves of a bus for voltage and capacitance.

The TCA9509 has two types of drivers – A-side drivers and B-side drivers. All inputs and B-side I/Os are overvoltage tolerant to 5.5 V. The A-side I/Os are overvoltage tolerant to 5.5 V when the device is unpowered (VCCB and/or VCCA = 0 V).

This TCA9509 integrated circuit is an I2C bus/SMBus Repeater for use in I2C/SMBus systems. It can also provide bidirectional voltage-level translation (up-translation/down-translation) between low voltages (down to 0.9 V) and higher voltages (2.7 V to 5.5 V) in mixed-mode applications. This device enables I2C and similar bus systems to be extended, without degradation of performance even during level shifting.

The TCA9509 buffers both the serial data (SDA) and the serial clock (SCL) signals on the I2C bus, thus allowing 400-pF bus capacitance on the B-side. This device can also be used to isolate two halves of a bus for voltage and capacitance.

The TCA9509 has two types of drivers – A-side drivers and B-side drivers. All inputs and B-side I/Os are overvoltage tolerant to 5.5 V. The A-side I/Os are overvoltage tolerant to 5.5 V when the device is unpowered (VCCB and/or VCCA = 0 V).
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Technical documentation

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Type Title Date
* Data sheet TCA9509 Level-Translating I2C and SMBUS Bus Repeater datasheet (Rev. D) PDF | HTML 15 Apr 2021
Application note Understanding Transient Drive Strength vs. DC Drive Strength in Level-Shifters (Rev. A) PDF | HTML 03 Jul 2024
Application note Resolving Improper Implementation of the Static Voltage Offset on I2C Buffers PDF | HTML 09 Oct 2023
Application note Why, When, and How to use I2C Buffers 23 May 2018
Application note Choosing the Correct I2C Device for New Designs PDF | HTML 07 Sep 2016
Application note Understanding the I2C Bus PDF | HTML 30 Jun 2015
Application note Maximum Clock Frequency of I2C Bus Using Repeaters 15 May 2015
Application note I2C Bus Pull-Up Resistor Calculation PDF | HTML 13 Feb 2015

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TCA9509 IBIS Model

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