TXB0102DCUR IC

Technical Specifications of TXB0102DCUR

Datasheet	TXB0102DCUR datasheet
Category	Integrated Circuits (ICs)
Family	Logic – Translators, Level Shifters
Manufacturer	Texas Instruments
Series	–
Packaging	Cut Tape (CT)
Part Status	Active
Translator Type	Voltage Level
Channel Type	Bidirectional
Number of Circuits	1
Channels per Circuit	2
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	8-VFSOP (0.091″, 2.30mm Width)
Supplier Device Package	US8

TXB0102DCUR Description

The TXB0102 is a 2-bit noninverting translator with two separate power supply rails that can be set to different voltages. The A input is set up to follow the messages from VCCA. VCCA can be used with any source voltage between 1.2 V and 3.6 V. The B port was made so that it could work with VCCB. VCCB works with values that range from 1.65 V to 5.5 V. This makes it possible to translate at low voltage in both directions between any voltage value, such as 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, and 5 V. We can’t put VCCA above VCCB. When the output-enable (OE) input is low, all of the outputs will be in a state called “high impedance.”

When this device is used with Ioff, it meets all of the conditions for partial power down. The Ioff circuits turn off the outputs when the power is turned off. This keeps the current from going backwards into the gadget and damaging it. To maintain OE’s high impedance during power up and power down, a pulldown resistor with at least the minimum value needed by the driver must be connected between OE and GND. With Nano FreeTM technology, the die is also the packaging. This is a big step forward in the field of designing IC packaging.

TXB0102DCUR Feature Description

● Output load considerations

To avoid excessive capacitive loading and guarantee proper O.S. triggering, TI suggests practicing cautious PCB design with small PCB trace lengths. The signal traces on a PCB must be kept short enough so that the total time taken by any reflections is less than the initial pulse. This ensures that any reflection experiences a low impedance at the driver, which improves signal integrity. The O.S. circuits are built to maintain power for about 10 ns. The maximum lumped load capacitance that may be driven is also proportional to the duration of the transient. The one-shot can time out before the signal is driven all the way to the positive rail if there are large capacitive loads. The O.S. timeout has been adjusted to provide the optimal balance between the maximum bit rate, load-driving capacity, and dynamic ICC.

To avoid O.S. retriggering, bus congestion, output signal oscillations, and other system-level effects, TI advises taking into account the capacitance that PCB trace length and connectors introduce to the TXB0102 output.

● Enable and disable

The TXB0102 has an output-enabled (OE) input. Setting OE to low turns off the device and puts all I/Os in high-impedance (Hi-Z) mode. The shutdown time (tdis) shows how long it takes from when OE goes low until the outputs are turned off (Hi-Z). When OE is set high, the enable 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 TXB0102 is made to run loads with a capacitance of up to 70 pF. The DC drive power of the TXB0102’s output drivers is low. If pullup or pulldown resistors are attached to the data I/Os from the outside, they must have values greater than 50 k so they don’t interfere with the TXB0102’s output drivers. For the same reason, you can’t use the TXB0102 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 kinds of tasks.

TXB0102DCUR Features

• The Texas Instruments NanoFreeTM packages have them.
• 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 more than 100 mA.

Application Information

In level-translation applications, the TXB0102 is used 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 the TI TXS010X goods. Any pulldown or pullup resistors that come from the outside should be bigger than 50 k.

Device Functional Modes

The TXB0102 gadget has two modes of operation: “on” and “off.” Set the OE input to low to turn off the device. This puts all I/Os in a high-impedance state. When the OE input is set to high, the device is turned on.

Power Supply Recommendations

Make sure that VCCA > VCCB at all times while the device is running. VCCA > VCCB does not hurt the device during power-up sequencing, so any power source can be turned up first. When either VCC is turned off (VCCA/B = 0 V), the TXB0102 has hardware that turns off all output ports. The  su input circuit is set up so that it is powered by VCCA. When the OE input is low, all outputs are set to a high-impedance state.

To make sure that the outputs are in a high-impedance state when the power is turned on or off, the OE input pin must be connected to GND with a pulldown resistor and must not be turned on until VCCB and VCCA are fully ramped and stable. The minimum number of pulldown resistors to ground is based on how much current the driver can supply.

Layout

● Layout Guidelines

Follow common rules for PCB layout to make sure the gadget works well. Power sources need bypass capacitors, which should be placed as close as possible to the VCCA, VCCB, and GND pins. To keep the load from getting too high, short line lengths must be used. PCB signal trace lengths must be kept short enough so that the round-trip delay of any reflection is less than the oneshot time, which is about 10 ns. This makes sure that any reflection meets low impedance at the source driver.

Conclusion

In conclusion, the TXB0102 device is a flexible and reliable way to translate low-voltage signals in both directions for a variety of level-translation uses. With its customizable power-supply rails and wide voltage acceptance ranges, it lets devices or systems with different interface voltages work together without any problems.

Having Ioff circuits protects the device when it is only partially powered down, stopping current backflow that could cause damage. Also, the new NanoFreeTM technology used in the design of the IC packaging makes it work better and be more reliable.

For optimal operation, it’s important to follow suggested PCB layout practices, such as keeping trace lengths short, using the right O.S. triggering, and keeping capacitive loading to a minimum. By following these rules, signal integrity can be maintained and bad system-level impacts can be avoided.

The TXB0102 device has features like VCC isolation, low power consumption, high latch-up speed, and compatibility with push-pull CMOS logic outputs. Because of these features, it is a great choice for a wide range of apps that need leveled translation.

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