The LSF family consists of bidirectional voltage level translators that operate from 0.8
V to 4.5 V (Vref_A) and 1.8 V to 5.5 V (Vref_B). 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
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 Vref_A and can be pulled up to any level between Vref_A and 5 V.
This functionality allows a seamless translation between higher and lower voltages selected by the
user without the need for directional control.
The supply voltage (Vpu#) for each channel may be individually set up with a pull up resistor. For example, CH1
may be used in up-translation mode (1.2 V ↔ 3.3 V) and CH2 in down-translation mode (2.5 V ↔ 1.8 V).
When EN is HIGH, the translator switch is on, and the An I/O is connected to the Bn I/O, respectively, allowing
bidirectional data flow between ports. When EN is LOW, the translator switch is off, and a high-impedance state
exists between ports. The EN input circuit is designed to be supplied by Vref_A. EN must be LOW to ensure the
high-impedance state during power-up or power-down.
View datasheet View product folder