4-Bit Bidirectional Multi-Voltage Level Translator for Open-Drain & Push-Pull

The LSF family consists of bidirectional voltage level translators that operate from 0.8 V to 4.5 V (VrefA) and 1.8 V to 5.5 V (VrefB). This range allows for bidirectional voltage translations between 0.8 V and 5.0 V without the need for a direction terminal in open-drain or push-pull applications. The LSF family supports level translation applications with transmission speeds greater than 100 MHz for open-drain systems that utilize a 15-pF capacitance and 165-Ω pull-up resistor.

When the An or Bn port is LOW, the switch is in the ON-state and a low resistance connection exists between the An and Bn ports. The low Ron of the switch allows connections to be made with minimal propagation delay and signal distortion. The voltage on the A or B side will be limited to VrefA and can be pulled up to any level between VrefA and 5 V. This functionality allows a seamless translation between higher and lower voltages selected by the user without the need for directional control.