4-BIT BUS SWITCH
4-BIT BUS SWITCH
IDT74FST3125
Integrated Device Technology, Inc.
FEATURES:
• Bus switches provide zero delay paths • ...
Description
4-BIT BUS SWITCH
IDT74FST3125
Integrated Device Technology, Inc.
FEATURES:
Bus switches provide zero delay paths Extended commercial range of –40°C to +85°C Low switch on-resistance: FST3xxx – 5Ω TTL-compatible input and output levels ESD > 2000V per MIL-STD-883, Method 3015; > 200V using machine model (C = 200pF, 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-compatible bus switch. The xOE 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...
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