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FSTU3257M Arkusz danych(PDF) 1 Page - Fairchild Semiconductor |
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FSTU3257M Arkusz danych(HTML) 1 Page - Fairchild Semiconductor |
1 / 6 page © 2005 Fairchild Semiconductor Corporation DS500302 www.fairchildsemi.com August 1999 Revised October 2006 FSTU3257 Quad 2:1 Multiplexer/Demultiplexer Bus Switch with 2V Undershoot Protection General Description The Fairchild Switch FSTU3257 is a quad 2:1 high-speed CMOS TTL-compatible multiplexer/demultiplexer bus switch. The low on resistance of the switch allows inputs to be connected to outputs without adding propagation delay or generating additional ground bounce noise. When OE is LOW, the select pin connects the A Port to the selected B Port output. The A and B Ports are “undershoot hardened” with Undershoot Hardened Circuit (UHC® ¥) pro- tection to support an extended range of 2.0V below ground. Fairchild’s integrated UHC senses undershoot at the I/O and responds by preventing voltage differentials from developing and turning on the switch. When OE is HIGH, the switch is OPEN and a high-impedance state exists between the two ports. Features s Undershoot hardened to 2V (A and B Ports) s Soft enable turn-on to minimize bus to bus charge sharing during enable s 4 : switch connection between two ports. s Minimal propagation delay through the switch. s Low lCC. s Zero bounce in flow-through mode. s Control inputs compatible with TTL level. s See Applications Note AN-5008 for details Ordering Code: Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code. Logic Diagram Pin Descriptions Connection Diagram Truth Table UHC® ¥ is a registered trademark of Fairchild Semiconductor Corporation. Order Number Package Number Package Description FSTU3257M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow FSTU3257QSC MQA16 16-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150" Wide FSTU3257MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Pin Name Description OE Bus Switch Enable S Select Input ABus A B1–B2 Bus B SOE Function X H Disconnect LL A B1 HL A B2 |
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