Level-Translating I2C Bus Repeater  - TCA9517A


Level-Translating I2C Bus Repeater



The TCA9517A is a bidirectional buffer with level shifting capabilities for I2C and SMBus systems. It provides 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 SMBus systems to be extended without degradation of performance, even during level shifting.

The TCA9517A buffers both the serial data (SDA) and the serial clock (SCL) signals on the I2C bus, thus allowing two buses of up to 400-pF bus capacitance to be connected in an I2C application.

The TCA9517A has two types of drivers: A-side drivers and B-side drivers. All inputs and I/Os are over-voltage tolerant to 5.5 V, even when the device is unpowered (VCCB and/or VCCA = 0 V).

The TCA9517A offers a higher contention level threshold, VILC, than the TCA9517, which allows connections to slaves which have weaker pulldown ability.

The type of buffer design on the B-side prevents it from being used in series with devices which use static voltage offset. This is because these devices do not recognize buffered low signals as a valid low and do not propagate it as a buffered low again.

The B-side drivers operate from 2.7 V to 5.5 V. The output low level for this internal buffer is approximately 0.5 V, but the input voltage must be 70 mV or more below the output low level when the output internally is driven low. The higher-voltage low signal is called a buffered low. When the B-side I/O is driven low internally, the low is not recognized as a low by the input. This feature prevents a lockup condition from occurring when the input low condition is released.

The A-side drivers operate from 0.9 V to 5.5 V and drive more current. They do not require the buffered low feature (or the static offset voltage). This means that a low signal on the B-side translates to a nearly 0 V low on the A-side, which accommodates smaller voltage swings of lower-voltage logic. The output pulldown on the A-side drives a hard low, and the input level is set at 0.3 × VCCA to accommodate the need for a lower low level in systems where the low-voltage-side supply voltage is as low as 0.9 V.

The A-side of two or more TCA9517As can be connected together, allowing many topographies, with the A-side as the common bus. Also, the A-side can be connected directly to any other buffer with static- or dynamic-offset voltage. Multiple TCA9517As can be connected in series, A-side to B-side, with no buildup in offset voltage and with only time-of-flight delays to consider. The TCA9517A cannot be connected B-side to B-side, because of the buffered low voltage from the B-side. The B-side cannot be connected to a device with rise time accelerators.

VCCA is only used to provide the 0.3 × VCCA reference to the A-side input comparators and for the power-good-detect circuit. The TCA9517A logic and all I/Os are powered by the VCCB pin.

As with the standard I2C system, pullup resistors are required to provide the logic-high levels on the buffered bus. The TCA9517A has standard open-drain configuration of the I2C bus. The size of these pullup resistors depends on the system, but each side of the repeater must have a pullup resistor. The device is designed to work with Standard mode and Fast mode I2C devices in addition to SMBus devices. Standard mode I2C devices only specify 3 mA in a generic I2C system, where Standard mode devices and multiple masters are possible. Under certain conditions, higher termination currents can be used.


  • Two-Channel Bidirectional Buffer
  • I2C Bus and SMBus Compatible
  • Operating Supply Voltage Range of 0.9 V to 5.5 V
    on A-side
  • Operating Supply Voltage Range of 2.7 V to 5.5 V
    on B-side
  • Voltage-Level Translation From 0.9 V – 5.5 V to
    2.7 V - 5.5 V
  • Footprint and Functional Replacement for
  • Active-High Repeater-Enable Input
  • Open-Drain I2C I/O
  • 5.5-V Tolerant I2C and Enable Input Support
    Mixed-Mode Signal Operation
  • Accommodates Standard Mode and Fast Mode
    I2C Devices and Multiple Masters
  • High-Impedance I2C Pins When Powered-Off
  • Latch-Up Performance Exceeds 100 mA Per
    JESD 78, Class II
  • ESD Protection Exceeds JESD 22
    • 5500 V Human-Body Model (A114-A)
    • 200 V Machine Model (A115-A)
    • 1000 V Charged-Device Model (C101)

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Parametrics Compare all products in I2C Level Shifters, Buffers, and Hubs

Number of Outputs
fSCLK (Max) (MHz)
VCC (Max) (V)
VCC (Min) (V)
Max Frequency (kHz)
Channel Width
Master Side I2C Bus Capacitance Supported (pF)
Slave Side I2C Bus Capacitance Supported (pF)
Special Features
Operating Temperature Range (C)
Package Group
TCA9517A PCA9515B TCA9509 TCA9517 TCA9617A
2    2    2    2    2   
0.4    0.4    0.4    0.4    1   
5.5    3.6    5.5    5.5    5.5   
0.9    2.3    2.7    0.9    0.8   
400    400    400    400    1000   
2    2    2    2    2   
400    400    400    400    550   
400    400    400    400    550   
Enable Pin
Low Voltage
Open-Drain I/O Type   
Enable Pin
Open-Drain I/O Type   
Enable Pin
Low Voltage
Open-Drain I/O Type
Power Save Mode   
Enable Pin
Low Voltage
Open-Drain I/O Type   
Enable Pin
Low Voltage
Open-Drain I/O Type   
-40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85   

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