16-BIT BUS SWITCH
Description
16-BIT BUS SWITCH
IDT74FST163245 IDT74FST163P245 ADVANCE INFORMATION
Integrated Device Technology, Inc.
FEATURES:
• Bus switches provide zero delay paths • Extended commercial range of –40°C to +85°C • Low switch on-resistance: FST163xxx – 5Ω FST163Pxxx – 5Ω with precharge • TTL-compatible input and output levels • ESD > 2000V per MIL-STD-883, Method 3015; > 200V using machine model (C = 200pF, R = 0) • Available in SSOP, TSSOP and TVSOP
DESCRIPTION:
The FST163245/163P245 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 n-channel 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 FST163245 and FST163P245 are 16-bit TTL-compatible bus switches.
The OE pins provide enable control.
The FST163P245 supports precharge on the B port.
So when OE is high, A and B ports are isolated and B outputs are precharged to the bias voltage through the equivalent of a 10KΩ resistor (1B1-8 precharged to VBIAS1 and 2B1-8 precharged to VBIAS1).
FUNCTIONAL BLOCK DIAGRAM
VBIAS1
1A1 1A1 1B1 1A8 1A8 1B8
1B1
1B8 VBIAS1
2A1
2B1
2A1
2B1
2A8 1OE 2OE FST163245
2B8
2A8 1OE 2OE FST163P245
2B8
PIN DESCRIPTION
Pin Names 1A1-8, 2A1-8 1B1-8, 2B1-8 1OE, 2OE VBIAS1 I/O I/O I/O I I Description Bus A Bus B Bus Switch Enable (Active LOW) Precharge Reference Voltage
3513 tbl 01 The IDT logo is a...
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