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 Semiconductor’s 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 Semiconductor’s 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 customer’s 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.

F August 1997 S T Revised January 2005 3 1 2 6 4 FST3126 - B i 4-Bit Bus Switch t B u s General Description Features S The Fairchild Switch FST3126 provides four high-speed (cid:1) 4Ω switch connection between two ports. w CMOS TTL-compatible bus switches. The low on resis- (cid:1) Minimal propagation delay through the switch. itc tpauntcs e woift hthoeu t swaidtcdhin ag llopwros piangpauttiso nto dbeel acyo nonre ctgeedn etora otiuntg- (cid:1) Low lCC. h additional ground bounce noise. (cid:1) Zero bounce in flow-through mode. The device is organized as four 1-bit switches with sepa- (cid:1) Control inputs compatible with TTL level. rate OE inputs. When OE is HIGH, the switch is ON and Port A is connected to Port B. When OE is LOW, the switch is OPEN and a high-impedance state exists between the two ports. Ordering Code: Order Number Package Number Package Description FST3126M M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow FST3126QSC MQA16 16-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150" Wide FST3126MTC MTC14 14-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. Logic Diagram Connection Diagrams Pin Assignment for SOIC and TSSOP Pin Assignment for QSOP Pin Descriptions Pin Name Description Truth Table OE1, OE2, OE3, OE4 Bus Switch Enables 1A, 2A, 3A, 4A Bus A Inputs Inputs/Outputs 1B, 2B, 3B, 4B Bus B OE A,B NC Not Connected L Z H A = B © 2005 Fairchild Semiconductor Corporation DS500044 www.fairchildsemi.com

6 2 Absolute Maximum Ratings Recommended Operating 1 (Note 1) 3 Conditions ST Supply Voltage (VCC) −0.5V to +7.0V (Note 3) F DC Switch Voltage (VS) −0.5V to +7.0V Power Supply Operating (VCC) 4.0V to 5.5V DC Input Voltage (VIN) (Note 2) −0.5V to +7.0V Input Voltage (VIN) 0V to 5.5V DC Input Diode Current (lIK) VIN<0V −50mA Output Voltage (VOUT) 0V to 5.5V DC Output (IOUT) Sink Current 128mA Input Rise and Fall Time (tr, tf) DC VCC/GND Current (ICC/IGND) +/− 100mA Switch Control Input 0nS/V to 5nS/V Storage Temperature Range (TSTG) −65°C to +150 °C Switch I/O 0nS/V to DC Free Air Operating Temperature (TA) −40 °C to +85 °C Note 1: The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum rating. The “Recommended Operating Conditions” table will define the conditions for actual device operation. Note 2: The input and output negative voltage ratings may be exceeded if the input and output diode current ratings are observed. Note 3: Unused control inputs must be held high or low. They may not float. DC Electrical Characteristics Symbol Parameter V (CVC) MinTA = −40 T°Cyp to +85 °CMax Units Conditions (Note 4) VIK Clamp Diode Voltage 4.5 −1.2 V IIN = −18mA VIH HIGH Level Input Voltage 4.0–5.5 2.0 V VIL LOW Level Input Voltage 4.0–5.5 0.8 V II Input Leakage Current 5.5 ±1.0 µA 0≤ VIN ≤5.5V IOZ OFF-STATE Leakage Current 5.5 ±1.0 µA 0 ≤A, B ≤VCC RON Switch On Resistance 4.5 4 7 Ω VIN = 0V, IIN = 64mA (Note 5) 4.5 4 7 Ω VIN = 0V, IIN = 30mA 4.5 8 15 Ω VIN = 2.4V, IIN = 15mA 4.0 11 20 Ω VIN = 2.4V, IIN = 15mA ICC Quiescent Supply Current 5.5 3 µA VIN = VCC or GND, IOUT = 0 ∆ICC Increase in ICC per Input 5.5 2.5 mA One input at 3.4V. Other inputs at VCC or GND Note 4: Typical values are at VCC = 5.0V and TA = +25°C Note 5: Measured by the voltage drop between A and B pins at the indicated current through the switch. On resistance is determined by the lower of the voltages on the two (A or B) pins. www.fairchildsemi.com 2

F AC Electrical Characteristics S T 3 TA = −40 °C to +85 °C, 1 Symbol Parameter VCC =C 4L. 5= −5 05p.5FV, RU = RDV =C C5 0=0 4Ω.0V Units Conditions Figure No. 26 Min Max Min Max tPHL,tPLH Prop Delay Bus to Bus (Note 6) 0.25 0.25 ns VI = OPEN Figures 1, 2 tPZH, tPZL Output Enable Time 1.0 4.5 5.0 ns VI = 7V for tPZL Figures 1, 2 VI = OPEN for tPZH tPHZ, tPLZ Output Disable Time 1.5 5.7 6.2 ns VI = 7V for tPLZ Figures 1, 2 VI = OPEN for tPHZ Note 6: This parameter is guaranteed by design but is not tested. The bus switch contributes no propagation delay other than the RC delay of the typical On resistance of the switch and the 50pF load capacitance, when driven by an ideal voltage source (zero output impedance). Capacitance (Note 7) Symbol Parameter Typ Max Units Conditions CIN Control Pin Input Capacitance 3 pF VCC = 5.0V CI/O Input/Output Capacitance 5 pF VCC = 5.0V, OE = 0V Note 7: TA = +25°C, f = 1 MHz, Capacitance is characterized but not tested. AC Loading and Waveforms Note: Input driven by 50 Ω source terminated in 50 Ω Note: CL includes load and stray capacitance Note: Input PRR = 1.0MHz, tW = 500ns FIGURE 1. AC Test Circuit FIGURE 2. AC Waveforms 3 www.fairchildsemi.com

6 2 Physical Dimensions 1 inches (millimeters) unless otherwise noted 3 T S F 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow Package Number M14A 16-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150" Wide Package Number MQA16 www.fairchildsemi.com 4

F PPhhyyssiiccaall DDiimmeennssiioonnss iinncchheess ((mmiilllliimmeetteerrss)) uunnlleessss ootthheerrwwiissee nnootteedd ((CCoonnttiinnuueedd)) S T 3 1 2 6 4 - B i t B u s S w i t c h 14-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC14 Technology Description The Fairchild Switch family derives from and embodies Fairchild’s proven switch technology used for several years in its 74LVX3L384 (FST3384) bus switch product. Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems 2. A critical component in any component of a life support which, (a) are intended for surgical implant into the device or system whose failure to perform can be rea- body, or (b) support or sustain life, and (c) whose failure sonably expected to cause the failure of the life support to perform when properly used in accordance with device or system, or to affect its safety or effectiveness. instructions for use provided in the labeling, can be rea- sonably expected to result in a significant injury to the www.fairchildsemi.com user. 5 www.fairchildsemi.com

ON Semiconductor and 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 Semiconductor’s 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 customer’s 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. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: N. American Technical Support: 800−282−9855 Toll Free ON Semiconductor Website: www.onsemi.com Literature Distribution Center for ON Semiconductor USA/Canada 19521 E. 32nd Pkwy, Aurora, Colorado 80011 USA Europe, Middle East and Africa Technical Support: Order Literature: http://www.onsemi.com/orderlit Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada Phone: 421 33 790 2910 Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada Japan Customer Focus Center For additional information, please contact your local Email: orderlit@onsemi.com Phone: 81−3−5817−1050 Sales Representative © Semiconductor Components Industries, LLC www.onsemi.com www.onsemi.com 1