Part Number: TXB0108RGYR

Manufacturer: Texas Instruments


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Technical Specifications of TXB0108RGYR

Datasheet  TXB0108RGYR datasheet
Category Integrated Circuits (ICs)
Family Logic – Translators, Level Shifters
Manufacturer Texas Instruments
Packaging Tape & Reel (TR)
Part Status Active
Translator Type Voltage Level
Channel Type Bidirectional
Number of Circuits 1
Channels per Circuit 8
Voltage – VCCA 1.2 V ~ 3.6 V
Voltage – VCCB 1.65 V ~ 5.5 V
Input Signal
Output Signal
Output Type Tri-State, Non-Inverted
Data Rate 100Mbps
Operating Temperature -40°C ~ 85°C (TA)
Features Auto-Direction Sensing
Mounting Type Surface Mount
Package / Case 20-VFQFN Exposed Pad
Supplier Device Package 20-VQFN (3.5×4.5)

TXB0108RGYR Description

This 8-bit noninverting translator uses two power rails that can be set up separately. Once the VCCA signal has been sent, the A port will be turned on. VCCA can work with a power source with a 1.2 V and 3.6 V voltage. The B port should come next after the VCCB signal. The VCCB works with power supplies with values between 1.65 V and 5.5 V. With this method, all voltage nodes (1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, and 5 V) can talk to each other in both directions.

It’s better if VCCA comes after VCCB. When the output-enable input is low, all outputs will have a high-impedance state. The OE input circuit of the TXB0108 gets its power from the VCCA. This device meets all the requirements for apps that use Ioff to shut down power in a partial way. When the device is turned off, the Ioff circuitry turns off the outputs. This keeps current from looping back through the device, which could be risky. When the power is turned on and off, connecting OE to GND with a pulldown resistor stays in its high-impedance state. The minimum number of the resistor should be based on how well the driver can supply a minimum amount of current.

TXB0108RGYR Features

  • VCC Isolation Feature: All outputs are high-impedance if either VCC input is connected to GND.
  • The OE input circuit is linked to the VCCA.
  • Low Power Consumption, Max ICC of 4 A.
  • Ioff can work in a partial power-down mode.
  • Per JESD 78, Class II, the latch-up performance is over 100 mA.

TXB0108RGYR Detailed Description

The TXB0108 is an 8-bit voltage-level translator that can work either way. It was made to translate logic voltage levels. The A port can handle I/O voltages between 1.2 V and 3.6 V, and the B port can handle between 1.65 V and 5.5 V. The device has a buffered architecture with edge-rate accelerators to improve the total data rate. This device can only translate CMOS logic outputs that use the push-pull method.

Feature Description

● Architecture

The TXB0108 architecture doesn’t need a direction-control signal to be sent in either direction to control whether data is moving from point A to point B or the other way around. When data starts to move oppositely on the bus, the TXB0108 has weak output drivers that an external driver can override. In a dc state, the TXB0108’s output drivers can hold a high or a low but aren’t very strong.

The output one-shots can find edges going up or down on either the A or B lines. When there is a rising edge, the one-shot turns on the PMOS transistors (T1, T3) for a short time. This makes the change from low voltage to high voltage happen faster. During a lowering edge, the one-shot does the same thing with the NMOS transistors (T2, T4). This speed up the change from high to low. During an output change, the impedance is usually 70 when VCCO is between 1.2 V and 1.8 V, 50 when VCCO is between 1.8 V and 3.3 V, and 40 when VCCO is between 3.3 V and 5 V.

● Output Load Considerations

TI suggests careful PCB planning practices and short PCB trace lengths to avoid too much capacitive loading and ensure the right O.S. triggering happens. PCB signal trace lengths should be kept short enough that the round-trip delay of any reflection is shorter than the one-shot time. This improves the signal quality by ensuring that any reflections reach the driver with low resistance. The O.S. circuits are made to stay on for about 10 ns.

The one-shot time also directly affects how far a mixed load can be pushed. When there are a lot of inductive loads, the one-shot can run out of time before the signal is fully moved to the positive line. The length of the O.S. has been chosen to get the best balance between the dynamic ICC, load driving ability, and highest bit rate. Both the length of the PCB trace and the number of connections add to the capacitance that the TXB0108 output sees. This lumped-load capacitance should be considered to avoid O.S. re-triggering, output signal oscillations, and other system-level problems.

● Enable and Disable

The OE input on the TXB0108 is used to turn the device off. This is done by setting OE = low, which puts all I/Os in the high-impedance (Hi-Z) state. The shutdown time (tdis) shows how long it takes from when OE goes low until the outputs are turned off (Hi-Z). When the OE is high, the activated time (ten) shows how long the user must wait for the one-shot circuitry to start working.

● Pullup or Pulldown Resistors on I/O Lines

The TXB0108 is made to run loads with a capacitance of up to 70 pF. The TXB0108’s output drivers have a low dc drive power. If outside pullup or pulldown resistors are connected to the data I/Os, They must have values greater than 50k so they don’t interfere with the TXB0108’s output drivers. For the same reason, you shouldn’t use the TXB0108 in I2C or 1-Wire applications where an open-drain driver is linked to the bidirectional data I/O. Use a level translator from the TI TXS01xx line for these tasks.

Device Functional Modes

The TXB0108 gadget has two modes of operation: “on” and “off.” Set the OE input low to turn off the device. This puts all I/Os in a high-impedance state. The device is turned on when the OE input is set to high.

Application Information

Level-translation apps can use the TXB0108 to connect devices or systems with different interface voltages to each other. It can only change the outputs of push-pull CMOS logic. If you need to translate an open-drain signal, please look at TI TXS010X goods. Any pulldown or pullup resistors that come from the outside should be bigger than 50k.


Incorporating the TXB0108RGYR level translator from Texas Instruments into your circuit design can greatly enhance your power management capabilities. With its versatile voltage range and 3-state output, this level shifter is the perfect device for microprocessor-based circuits. Don’t miss out on this product’s benefits – order now from ICRFQ and start improving your circuit design today. With our commitment to providing high-quality components on schedule, you can always trust ICRFQ to be your go-to supplier. Take action now and elevate your circuit design to the next level!

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