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FSTU3125M Folha de dados(PDF) 1 Page - Fairchild Semiconductor |
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FSTU3125M Folha de dados(HTML) 1 Page - Fairchild Semiconductor |
1 / 7 page © 2001 Fairchild Semiconductor Corporation DS500449 www.fairchildsemi.com June 2001 Revised August 2001 FSTU3125 4-Bit Bus Switch with −2V Undershoot Protection General Description The Fairchild Switch FSTU3125 provides four high-speed CMOS TTL-compatible bus switches. The low On Resis- tance of the switch allows inputs to be connected to out- puts without adding propagation delay or generating additional ground bounce noise. The A and B Ports are protected against undershoot to support an extended range to 2.0V below ground. Fairchild’s integrated Under- shoot Hardened Circuit (UHC ) senses undershoot at the I/O and responds by preventing voltage differentials from developing and turning the switch on. The device is organized as four 1-bit switches with sepa- rate OE inputs. When OE is LOW, the switch is 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. Features s Undershoot hardened to −2V (A and B Ports) s 4 Ω 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 application notes AN-5008 and AN-5021 for details on undershoot Ordering Code: Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagrams Pin Assignment for SOIC and TSSOP Pin Assignment for QSOP Pin Descriptions Truth Table Order Number Package Number Package Description FSTU3125M M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow FSTU3125QSC MQA16 16-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150" Wide FSTU3125MTC MTC14 14-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Pin Name Description OE1, OE2, OE3, OE4 Bus Switch Enables 1A, 2A, 3A, 4A Bus A 1B, 2B, 3B, 4B Bus B NC Not Connected Inputs Inputs/Outputs OE A,B LA = B HZ |
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