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.74LCX543 Low Voltage Octal Registered Transceiver with 5V Tolerant Inputs and Outputs May 1995 Revised March 2001 74LCX543 Low Voltage Octal Registered Transceiver with 5V Tolerant Inputs and Outputs General Description Features The LCX543 is a non-inverting octal transceiver containing 5V tolerant inputs and outputs two sets of D-type registers for temporary storage of data 2.3V 3.6V V specifications provided CC flowing in either direction. Separate Latch Enable and Out- 7.0 ns t max (V = 3.3V), 10 A I max PD CC CC put Enable inputs are provided for each register to permit independent input and output control in either direction of Power down high impedance inputs and outputs data flow. Supports live insertion/withdrawal (Note 1) The LCX543 is designed for low voltage (2.5V or 3.3V) V CC 24 mA Output Drive (V = 3.0V) CC applications with capability of interfacing to a 5V signal Implements patented noise/EMI reduction circuitry environment. Latch-up performance exceeds 500 mA The LCX543 is fabricated with an advanced CMOS tech- ESD performance: nology to achieve high speed operation while maintaining Human body model > 2000V CMOS low power dissipation. Machine model > 200V Note 1: To ensure the high-impedance state during power up or down, OE should be tied to V through a pull-up resistor: the minimum value or the CC resistor is determined by the current-sourcing capability of the driver. Ordering Code: Order Number Package Number Package Description 74LCX543WM M24B 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 74LCX543MSA MSA24 24-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide 74LCX543MTC MTC24 24-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Devices also available in Tape and Reel. Specify by appending the suffix letter X to the ordering code. Connection Diagram Pin Descriptions Pin Names Description OEAB A-to-B Output Enable Input (Active LOW) OEBA B-to-A Output Enable Input (Active LOW) CEAB A-to-B Enable Input (Active LOW) CEBA B-to-A Enable Input (Active LOW) LEAB A-to-B Latch Enable Input (Active LOW) LEBA B-to-A Latch Enable Input (Active LOW) A A A-to-B Data Inputs or 0 7 B-to-A 3-STATE Outputs B B B-to-A Data Inputs or 0 7 A-to-B 3-STATE Outputs 2001 Fairchild Semiconductor Corporation DS012463 www.fairchildsemi.com