IDT74FST3125 Datasheet | Integrated Device

4-BIT BUS SWITCH Integrated Device Technology, Inc. Features : - Bus switches provide zero delay paths - Extended mercial range of - 40°C to +85°C - Low switch on-resistance: FST3xxx - 5Ω - TTL-patible input and output levels - ESD > 2000V per MIL-STD-883, Method 3015; > 200V using machine model (C = 200p F, R = 0) - Available in QSOP and SOIC DESCRIPTION: The FST3125 belong to IDT's family of Bus switches. Bus switch devices perform the function of connecting or isolating two ports without providing any inherent current sink or source capability. Thus they generate little or no noise of their own while providing a low resistance path for an external driver. These devices connect input and output ports through an nchannel FET. When the gate-to-source junction of this FET is adequately forward-biased the device conducts and the resistance between input and output ports is small. Without adequate bias on the gate-to-source junction of the FET, the FET is turned off, therefore with no VCC applied, the device has hot insertion capability. The low on-resistance and simplicity of the connection between input and output ports reduces the delay in this path to close to zero. The FST3125 is a 4-bit TTL-patible bus switch. The x OE pins provide individual enable control for each of the four bits. FUNCTIONAL BLOCK DIAGRAM 1A 1OE 1Y PIN CONFIGURATION 1 2 3 4 5 6 7 8 SOIC/QSOP TOP VIEW SO16-1 SO16-7 16 15 14 13 12 11 10 9 Vcc 4OE 4A 4Y 3OE 3A 3Y NC NC 1OE 2A 2OE 3A 3OE 4A 4OE 2Y 1A 1Y 3Y 2OE 2A 2Y 4Y 3471 drw 01 3471 drw 02 PIN DESCRIPTION Pin Names 1A-4A 1Y-4Y NC 1OE, 4OE I/O I/O I/O - I Description Bus A Bus B No Connect Bus Switch Enable (Active...