LTC1694 - SMBus/I²C Accelerator


  • Improves SMBus Rise Time Transition
  • Ensures Data Integrity with Multiple Devices
    on the SMBus
  • Improves Low State Noise Margin
  • Auto Detect Low Power Standby Mode
  • Wide Supply Voltage Range: 2.7V to 6V
  • Low Profile (1mm) SOT-23 (ThinSOT™) Package

Typical Application

LTC1694 Typical Application
LTC1694 Typical Application


The LTC™1694 is a dual SMBus active pull-up designed to enhance data transmission speed and reliability under all specified SMBus loading conditions. The LTC1694 is also compatible with the Philips I²C™ Bus.

The LTC1694 allows multiple device connections or a longer, more capacitive interconnect, without compromising slew rates or bus performance, by using two bilevel hysteretic current source pull-ups.

During positive bus transitions, the LTC1694 current sources provide 2.2mA to quickly slew the SMBus line. During negative transitions or steady DC levels, the current sources decrease to 275µA to improve negative slew rate and improve low state noise margins. An auto detect standby mode reduces supply current if both SCL and SDA are high.

The LTC1694 is available in a 5-pin SOT-23 package, requiring virtually the same space as two surface mount resistors.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC1694CS5#PBF SOT-23 S5 C 05-08-1635 Yes
LTC1694CS5#TRMPBF SOT-23 S5 C 05-08-1635 Yes
LTC1694CS5#TRPBF SOT-23 S5 C 05-08-1635 Yes
LTC1694IS5#PBF SOT-23 S5 I 05-08-1635 Yes
LTC1694IS5#TRMPBF SOT-23 S5 I 05-08-1635 Yes
LTC1694IS5#TRPBF SOT-23 S5 I 05-08-1635 Yes

LTC1694 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTC1694CS5#PBF SOT-23 C $1.56 Yes
LTC1694CS5#TRMPBF SOT-23 C $1.61 $1.35 Yes
LTC1694CS5#TRPBF SOT-23 C $1.61 $1.30 Yes
LTC1694IS5#PBF SOT-23 I $2.01 Yes
LTC1694IS5#TRMPBF SOT-23 I $2.01 $1.65 Yes
LTC1694IS5#TRPBF SOT-23 I $2.01 $1.60 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards


  • Notebook and Palmtop Computers
  • Portable Instruments
  • Battery Chargers
  • Industrial Control Application
  • TV/Video Products
  • ACPI SMBus Interface

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