1 Features
• Fully configurable dual-rail design allows each port
to operate from 1.1V to 5.5V
• Up to 200Mbps support for 3.3V to 5.0V
• Schmitt-trigger inputs allows for slow and noisy
inputs
• Inputs with integrated static pull-down resistors
prevent channels from floating
• High drive strength (up to 12mA at 5V)
• Low power consumption
– 2.5μA maximum (25°C)
– 6μA maximum (–40°C to 125°C)
• VCC isolation and VCC disconnect (Ioff-float) feature
– If either VCC input is <100 mV or disconnected,
all outputs are disabled and become highimpedance
• Ioff supports partial-power-down mode operation
• Control logic (OE) with VCC(MIN) circuitry allows for
control from either A or B port
• TXU0104 supports active high OE, TXUN0104
supports active low OE
• Pinout compatible with TXB family level shifters
• Available in other variants that support common
applications: TXU0204, TXU0304
• Operating temperature from –40°C to +125°C
• Latch-up performance exceeds 100mA per JESD
78, class II
• ESD protection exceeds JESD 22
– 2500V human-body model
– 1500V charged-device model

2 Applications
• Eliminate slow or noisy input signals
• Driving indicator LEDs or buzzers
• Debouncing a mechanical switch
• General purpose I/O level shifting
• Push-pull level shifting (UART, SPI, JTAG, and so
forth)

3 Description
TXU0104 / TXUN0104 is a 4-bit, dual-supply
noninverting fixed direction voltage level translation
device. Ax pins are referenced to VCCA logic level,
OE pin can be referenced to either VCCA or VCCB
logic levels, and Bx pins are referenced to VCCB logic
levels. The A port is able to accept input voltages
ranging from 1.1V to 5.5V, while the B port can
also accept input voltages from 1.1V to 5.5V. Fixed
direction data transmission can occur from A to B
or B to A when OE is set to high in reference to
either supply. When OE is set to low, all output pins
are in the high-impedance state. The only difference
between TXU0104 and TXUN0104 is the OE / OE
signal being active high and active low respectively.
See Section 7.4 for a summary of the operation of the
control logic.