Part Number: TXS0108EQPWRQ1

Manufacturer: Texas Instruments


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Technical Specifications of TXS0108EQPWRQ1

Datasheet  TXS0108EQPWRQ1 datasheet
Category Integrated Circuits (ICs)
Family Logic – Translators, Level Shifters
Manufacturer Texas Instruments
Series Automotive, AEC-Q100
Packaging Tape & Reel (TR)
Part Status Active
Translator Type Voltage Level
Channel Type Bidirectional
Number of Circuits 1
Channels per Circuit 8
Voltage – VCCA 1.4 V ~ 3.6 V
Voltage – VCCB 1.65 V ~ 5.5 V
Input Signal
Output Signal
Output Type Open Drain, Push-Pull
Data Rate 110Mbps
Operating Temperature -40°C ~ 125°C (TA)
Features Auto-Direction Sensing
Mounting Type Surface Mount
Package / Case 20-TSSOP (0.173″, 4.40mm Width)
Supplier Device Package 20-TSSOP

TXS0108EQPWRQ1 Introduction

The TXS0108EQPWRQ1 is an eight-channel, bidirectional voltage-level translator with automated direction sensing used to connect devices with various voltage levels. The voltage-level translation is a crucial component of electronic design since different voltage levels may be used by different devices, and communication between them is necessary to maintain appropriate operation.

In a variety of applications, such as industrial automation, automotive systems, and consumer electronics, the TXS0108EQPWRQ1 offers an effective solution for voltage-level translation. Its automated direction-detecting capability makes the design simpler and eliminates the need for extra control signals.

In this manual, we will examine the characteristics and features of the TXS0108EQPWRQ1, discuss its uses, benefits, and drawbacks, and offer advice on circuit design and operation.

TXS0108EQPWRQ1 Description

This device uses two independently programmable power supply rails as an 8-bit non-inverting level translator. The supply voltage of the VCCA pin is monitored by the A terminal. Any voltage source ranging from 1.4 V to 3.6 V may be used as input to the VCCA pin. The power supply of the VCCB pin is monitored via the B port. The VCCB pin’s supply voltage could be any value between 1.65 V and 5.5 V. You may switch between low voltage translation in either direction between 1.5 V and 5 V, 3.3 V, 2.5 V, and 1.8 V and 2.5 V using just two input supply pins. The output-enable (OE) input’s low state causes all outputs to be in the high-impedance (Hi-Z) condition. Connecting OE to GND through a pull-down resistor will keep the Hi-Z condition during power-on and power-off. The driver’s capacity to provide a constant minimum current determines the resistor’s minimum value.

TXS0108EQPWRQ1 Features

  • 4 V to 3.6 V on the A port and 1.65 V to 5.5 V on the B port (VCCA VCCB).
  • There is no need to sequence the power supplies; either VCCA or VCCB can be ramped up first.
  • Per JESD 78, Class II, the latch-up performance is over 100 mA.

Detailed Description

The directionless voltage-level translator TXS0108E-Q1 is made exclusively for converting logic voltage levels. I/O voltages between 1.4 V and 3.6 V are supported by the A-port. I/O voltages between 1.65 V and 5.5 V are supported via the B-port. The system uses edge rate accelerators and passes gate design to increase the data rate overall. The pull-up resistors, which are frequently employed in open-drain applications, have been simply integrated, eliminating the need for an external resistor. While being made for open-drain applications, this device can also translate push-pull CMOS logic outputs.

Features description

● Input Driver Requirements

The amount of continuous DC current the TXS0108E-Q1 can sink is determined by the external system-level open-drain (or push-pull) drivers that are connected to the chip’s I/O pins. These bidirectional I/O circuits can only produce a few hundred microamperes of DC current due to the inbuilt pull-up resistors, which is necessary since the high bandwidth is utilized to swiftly transition from input to output and from output to input.

The fall time (tfA, tfB) of a signal is affected by the edge rate and output impedance of the external device controlling the TXS0108E-Q1 data I/Os as well as the capacitive loading on the data lines. Both the tPHL and the theoretical maximum data rate are affected by the external driver’s output impedance. The data sheet assumes an output impedance of less than 50 for the external driver, which affects the values for tfA, tPHL, tfB, and maximum data rates.

● Output Load Considerations

To prevent incorrect one-shot triggering and excessive capacitive loading, TI suggests using tight PCB layout principles and low PCB trace lengths. Signal traces should be kept short enough when constructing a printed circuit board so that any reflected signals don’t extend the transmission time beyond the initial value. Signal integrity is enhanced by ensuring that each reflected signal encounters a low impedance at the driver. These “one-shot” circuits typically have a lifetime of 30 ns.

The maximum lumped load capacitance that can be driven has a strong correlation with one-shot time. If the load is especially capacitive, the one-shot may time out before the signal is driven all the way to the positive rail. The one-shot time has been calculated by considering the maximum bit rate, load-driving capacity, and dynamic ICC. The connectors’ and PCB traces’ lengths enhance the capacitance of the TXS0108E-Q1 output. TI advises considering this lumped-load capacitance due to the possibility of one-shot retriggering, bus congestion, output signal oscillations, and other system-level consequences.

● Enable and Disable

When the OE pin input on the TXS0108E-Q1 is set to low, all of the I/Os are placed in the Hi-Z state, which disables the device. The disable time (tdis) is a measurement of the time interval between when the OE pin goes low and when the outputs are really disabled (Hi-Z). The one-shot circuitry must have enough time to become active after the OE pin gets high, as indicated by the enable time (ten).

● Pull-up or Pull-down Resistors on I/O Lines

The value of the smart pull-up resistors changes depending on whether the TXS0108E-I/O Q1 line is sending a low or a high. For each I/O on the A and B ports, there is a pull-up resistor (RPUA or RPUB) to VCCA or VCCB. When the output is being driven very little, the value of RPUA and RPUB is 40k. When the output driving level is high, both RPUA and RPUB have a value of 4k. When OE is low, RPUA and RPUB don’t work. This innovation improves the performance of simultaneous switching by allowing for larger VOL values and lower VOL values for pass-gate transistors of the same size. It also reduces static power consumption when the I/Os pass a low.


In summary, the TXS0108EQPWRQ1 is a flexible and effective 8-bit bidirectional voltage-level translator with automatic direction sensing that is appropriate for a variety of electrical design applications. It facilitates the communication of numerous voltage levels between devices using I2C, SPI, and UART communication interfaces, and it makes circuit design simpler. Due to the device’s low-voltage operation, bi-directional level shifting, and overvoltage protection, electronic designers can choose it with confidence.

The TXS0108EQPWRQ1 and other premium electronic parts are available from ICRFQ at competitive rates. A staff of trained experts is standing by to help with purchases and inquiries. The performance and dependability of their electronic circuits can be enhanced by designers employing the TXS0108EQPWRQ1 and other high-quality electronic parts from ICRFQ.

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