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SN74CB3Q3253PWR Fiches technique(PDF) 8 Page - Texas Instruments

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No de pièce SN74CB3Q3253PWR
Description  Dual 1-of-4 FET Multiplexer ??Demultiplexer
Download  25 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

SN74CB3Q3253PWR Fiches technique(HTML) 8 Page - Texas Instruments

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A
EN(1)
B
Charge
Pump
VCC
SN74CB3Q3253
SCDS145B – OCTOBER 2003 – REVISED JUNE 2015
www.ti.com
8 Detailed Description
8.1 Overview
The SN74CB3Q3253 device is a high-bandwidth FET bus switch using a charge pump to elevate the gate
voltage of the pass transistor, providing a low and flat ON-state resistance (ron). The low and flat ON-state
resistance allows for minimal propagation delay and supports rail-to-rail switching on the data input/output (I/O)
ports. The device also features low data I/O capacitance to minimize capacitive loading and signal distortion on
the data bus. Specifically designed to support high-bandwidth applications, the SN74CB3Q3253 device provides
an optimized interface solution ideally suited for broadband communications, networking, and data-intensive
computing systems.
The SN74CB3Q3253 device is organized as two 1-of-4 multiplexers/demultiplexers with separate output-enable
(1OE, 2OE) inputs. The select (S0, S1) inputs control the data path of each multiplexer/demultiplexer. When OE
is low, the associated multiplexer/demultiplexer is enabled, and the A port is connected to the B port, allowing
bidirectional data flow between ports. When OE is high, the associated multiplexer/demultiplexer is disabled, and
a high-impedance state exists between the A and B ports.
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry prevents damaging
current backflow through the device when it is powered down. The device has isolation during power off.
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
(1) EN is the internal enable signal applied to the switch.
Figure 4. Simplified Schematic, Each FET Switch (SW)
8
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Product Folder Links: SN74CB3Q3253


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