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LSF0101, LSF0102, LSF0108

SDLS966H – DECEMBER 2013 – REVISED JUNE 2019

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Product Folder Links: LSF0101 LSF0102 LSF0108

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Copyright © 2013–2019, Texas Instruments Incorporated

(1)

The downstream channel should not be actively driven through a low impedance driver, or else there may be bus contention.

(2)

The A-side can have a pullup to Vref_A for additional current drive capability or may also be pulled above Vref_A with a pullup resistor.

Specifications in the Recommended Operating Conditions should always be followed.

8.4 Device Functional Modes

For each channel (n), when either the An or Bn port is LOW, the switch provides a low impedance path between

connections to be made with minimal propagation delay and signal distortion.

When the signal is being driven from Bn to An and the Bn port is driven HIGH, the switch will be OFF, clamping

the voltage on the An port to the voltage set by Vref_A. When the signal is being driven from A to B and the An

port is HIGH, the switch will be OFF and the Bn port will then driven to a voltage higher than Vref_A by the pullup

between higher and lower voltages selected by the user, without the need for directional control.

Refer to Table 1 for a summary of device operation. For additional details on the functional operation of the LSF

family of devices, see the Down Translation with the LSF Family and Up Translation with the LSF Family videos.

Table 2. Device Functionality

Input State

Switch State

Functionality

B to A (Down Translation)

B = LOW

ON

(Low Impedance)

A-side voltage is pulled low through the switch to the B-side voltage

B = HIGH

OFF

(High Impedance)

A to B (Up Translation)

A = LOW

ON

(Low Impedance)

B-side voltage is pulled low through the switch to the A-side voltage

A = HIGH

OFF

(High Impedance)

B-side voltage is clamped at Vref_A and then pulled up to the Vpu#

supply voltage

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

The LSF devices are able to perform voltage translation for open-drain or push-pull interfaces. Table 3 provides

common interfaces and the corresponding device recommendation from the LSF family which supports the

corresponding bit count.

Table 3. Voltage Translator for Common Interfaces

Part Name

Channel Number

Interface

LSF0101

1

GPIO

LSF0102

2

LSF0108

8