Part Number: LSF0108RKSR

Manufacturer: Texas Instruments


Shipped from: Shenzhen/HK Warehouse

Stock Available: Check with us

Technical Specifications of LSF0108RKSR

Datasheet  LSF0108RKSR datasheet
Category Integrated Circuits (ICs)
Family Logic – Translators, Level Shifters
Manufacturer Texas Instruments
Packaging Tape & Reel (TR)
Part Status Active
Translator Type Voltage Level
Channel Type Bidirectional
Number of Circuits 1
Channels per Circuit 8
Voltage – VCCA 0.95 V ~ 4.5 V
Voltage – VCCB 1.8 V ~ 5.5 V
Input Signal
Output Signal
Output Type Open Drain, Push-Pull
Data Rate
Operating Temperature -40°C ~ 125°C (TA)
Features Auto-Direction Sensing
Mounting Type Surface Mount
Package / Case 20-VFQFN Exposed Pad
Supplier Device Package 20-VQFN (4.5×2.5)

LSF0108RKSR Introduction

Signals can be converted from one voltage domain to another with the LSF0108RKSR, a voltage-level translator that operates in both directions. The component was developed specifically for use in contexts that call for functioning at low voltage. This comprehensive overview will cover the characteristics, advantages, and practical uses of the LSF0108RKSR.

LSF0108RKSR Description

The LSF series of devices allows for bidirectional voltage translation without requiring a DIR pin, which helps reduce the amount of effort put into the system (for PMBus, I2C, SMBus, and so forth). The LSF family of devices supports up to 100 MHz of up translation and greater than 100 MHz of down translation at cap loads of less than 30 pF, as well as up to 40 MHz of up/down translation at cap loads of up to 50 pF; This allows for more consumer and telecom interfaces to be supported by the LSF family (MDIO or SDIO). The TTL levels in industrial and telecom applications are compatible with the LSF family’s 5-V tolerance on the I/O port. The LSF family is distinguished by its adaptability due to the fact that multiple voltage translation levels can be set up on each channel.

LSF0108RKSR Features

  • Offers voltage translation in both directions despite the absence of a direction pin.
  • Up to 100 MHz of up translation and greater than 100 MHz of down translation are supported with a cap load of less than 30 pF, and up to 40 MHz of up/down translation are supported with a cap load of 50 pF.
  • a low current when standing by.
  • 5-V tolerance I/O port to support TTL.
  • Low RON gives less signal distortion.
  • Flow-through pinout to facilitate simple trace routing on the Board.
  • Operating temperature range of –40 degrees Celsius to 125 degrees Celsius. Latch-up performance of more than 100 milliamperes, as specified by JESD 17.

Detailed Description

A level translator is utilized when two devices or systems must communicate, but their interface voltages differ. the LSF family can be utilized as a level translator. In applications with an open-drain driver coupled with the data I/Os, the LSF family is an excellent component choice. LSF can reach 100 MHz when designed with the necessary pull-up resistors and layout. In addition, applications that include a push-pull driver and the data I/Os can take advantage of the LSF family. for an introduction to the configuration and use of the gadget.

Feature Description

Continual Bidirectional Automatic Power Flow The LSF family’s constituent parts are all automatic, bidirectional voltage level translators that can operate from a Vref A source of 0.95 to 4.5 V and a Vref B supply of 1.8 to 5.5 V.  This enables bidirectional voltage translation between 0.95 V and 5.5 V in open-drain or push-pull applications without requiring a direction pin. The LSF series supports level translation applications with transmission speeds larger than 100 Mbps for open-drain systems. These applications require a capacitance of 30 pF and a pullup resistor of 250 ohms.

Push-pull or open-drain output configurations are both possible for the controller’s output driver and the output of the peripheral device (pull-up resistors may be required). The B-side, which refers to the devices connected to the B ports, is frequently referred to as the high side, and this terminology is used in both the up and down translations. The A-side is also sometimes called the low side of the record.

● Output Enable

Both I/O pins need to be pulled up to the HIGH side (Vpu or VCCB) using a pull-up resistor (usually 200 k), and the EN input needs to be connected directly to Vref B when the device is operating to enable the I/O pins. The EN pin must always be set to LOW to maintain the high impedance state, whether when the device is starting up, shutting down, or operating. It is recommended that an open-drain driver that does not have a pullup resistor be used to disable the EN pin because it must always be connected directly to the Vref B pin. Because of this, Vref B can manage the EN input and bias the channels appropriately so that translation can occur. It is recommended that a filter capacitor be placed on Vref B to provide a consistent supply at the device.

● Up and Down Translation

When the signal is being driven from A to B, the pullup resistor connected to the pull-up supply voltage (Vpu#) will cause the Bn port to be driven to a voltage greater than Vref A when the switch is in the OFF position. This feature eliminates the requirement for directional control, allowing for a smooth transition between the user-selected higher and lower voltages. On the high side, a pull-up resistor is always necessary, but on the low side, a pull-up is only necessary if the output of the low-side device is an open drain or if the input leakage is larger than 1 A.


The LSF0108RKSR is a highly flexible and efficient bidirectional voltage-level translator that allows for smooth voltage translation between different voltage domains without a direction pin. Its low standby current and 5-V tolerance I/O port and its support for PMBus, I2C, SMBus, consumer, and telecom interfaces make it useful in various applications. Its flow-through pinout and -40°C to 125°C operating temperature range, high-impedance I/O pins, low RON, and latch-up performance of >100 mA per JESD 17, are all features that contribute to its versatility and reliability. In conclusion, the LSF0108RKSR is an excellent addition to any setup requiring voltage to be translated in both directions.

Moreover, ICRFQ, a trusted supplier of top-quality products, offers excellent customer service to ensure you get the best experience with your purchase. In conclusion, upgrading your power system with the LSF0108RKSR from ICRFQ will provide you with a high-quality, dependable component that meets the requirements of many different applications. Choose the TPS82150 MicroSiP™ power module today and experience the benefits of its advanced technology and reliability.

4.8/5 - (397 votes)
Kevin Chen