Is Now Part of To learn more about ON Semiconductor, please visit our website at www.onsemi.com Please note: As part of the Fairchild Semiconductor integration, some of the Fairchild orderable part numbers will need to change in order to meet ON Semiconductors system requirements. Since the ON Semiconductor product management systems do not have the ability to manage part nomenclature that utilizes an underscore ( ), the underscore ( ) in the Fairchild part numbers will be changed to a dash (-). This document may contain device numbers with an underscore ( ). Please check the ON Semiconductor website to verify the updated device numbers. The most current and up-to-date ordering information can be found at www.onsemi.com. Please email any questions regarding the system integration to Fairchild questions onsemi.com. ON Semiconductor and the ON Semiconductor logo are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductors product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. Typical parameters which may be provided in ON Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including Typicals must be validated for each customer application by customers technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.FSTD3125 4-Bit Bus Switch with Level Shifting May 2012 FSTD3125 4-Bit Bus Switch with Level Shifting Features Description Fairchild switch FSTD3125 provides four high-speed 4 Switch Connection between Two Ports CMOS TTL-compatible bus switches. The low on Minimal Propagation Delay through the Switch resistance of the switch allows inputs to be connected to outputs without adding propagation delay or generating Low I CC additional ground bounce noise. A diode to V has CC Zero Bounce in Flow-through Mode been integrated into the circuit to allow for level shifting between 5V inputs and 3.3V outputs. Control Inputs Compatible with TTL Level The device is organized as four one-bit switches with TruTranslation Voltage Translation from 5.0V Inputs separate /OE inputs. When /OE is LOW, the switch is to 3.3V Outputs ON and port A is connected to port B. When /OE is HIGH, the switch is OPEN and a high-impedance state exists between the two ports. Ordering Information Operating Packing Part Number Temperature Package Method Range 14-Lead, Thin Shrink Small Outline Package (TSSOP), JEDEC FSTD3125MTCX -40 to 85C Tape and Reel MO-153, 4mm Wide 1 /OE 1 23 1A 1B 4 /OE 2 56 2B 2A 10 /OE 3 9 8 3B 3A 13 /OE 4 12 11 4B 4A Figure 1. Logic Diagram 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com FSTD3125 Rev. 1.0.3