1 Features

• Provides bidirectional voltage translation with no

direction terminal

• Supports up to 100-MHz up translation and greater

than 100-MHz down translation

at ≤ 30-pF capacitor load and up to 40-MHz up/

down translation at 50-pF capacitor load

• Supports Ioff, partial power-down mode (refer to

Feature Description)

• Allows bidirectional voltage level translation

between

– 0.8 V ↔ 1.8, 2.5, 3.3, 5 V

– 1.2 V ↔ 1.8, 2.5, 3.3, 5 V

– 1.8 V ↔ 2.5, 3.3, 5 V

– 2.5 V ↔ 3.3, 5 V

– 3.3 V ↔ 5 V

• Low standby current

• 5 V Tolerance I/O port to support TTL

• Low Ron provides less signal distortion

• High-impedance I/O terminals for EN = Low

• Flow-through pinout for easy PCB trace routing

• Latch-up performance exceeds 100 mA per

JESD17

• –40°C to 125°C operating temperature range

• ESD performance tested per JESD 22

– 2000-V human-body model (A114-B, Class II)

– 200-V machine model (A115-A)

– 1000-V charged-device model (C101)

2 Applications

• GPIO, MDIO, PMBus, SMBus, SDIO, UART, I2C,

and other interfaces in telecom infrastructure

• Industrial

• Automotive

• Personal computing

3 Description

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 opendrain

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 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.