The SN74CB3Q3251 is a high-bandwidth FET bus switch utilizing 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 SN74CB3Q3251 provides an optimized interface solution ideally suited for broadband communications, networking, and data-intensive computing systems.
The SN74CB3Q3251 is a 1-of-8 multiplexer/demultiplexer with a single output-enable (OE\) input. The select (S0, S1, S2) inputs control the data path of the multiplexer/demultiplexer. When OE\ is low, the 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 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.
</li> <li>Rail-to-Rail Switching on Data I/O Ports<br> – 0- to 5-V Switching With 3.3-V V<sub>CC</sub><br> – 0- to 3.3-V Switching With 2.5-V V<sub>CC</sub></li> <li>Bidirectional Data Flow With Near-Zero Propagation Delay</li> <li>Low Input/Output Capacitance Minimizes Loading and Signal Distortion<br> (C<sub>io(OFF)</sub> = 3.5 pF Typ)</li> <li>Fast Switching Frequency<br> (f<sub>OE\</sub> or f<sub>S</sub> = 20 MHz Max)</li> <li>Data and Control Inputs Provide Undershoot Clamp Diodes</li> <li>Low Power Consumption (I<sub>CC</sub> = 1 mA Typ)</li> <li>V<sub>CC</sub> Operating Range From 2.3 V to 3.6 V</li> <li>Data I/Os Support 0- to 5-V Signaling Levels (0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5 V)</li> <li>Control Inputs Can Be Driven by TTL or 5-V/3.3-V CMOS Outputs</li> <li>I<sub>off</sub> Supports Partial-Power-Down Mode Operation</li> <li>Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II</li> <li>ESD Performance Tested Per JESD 22<br> – 2000-V Human-Body Model (A114-B, Class II)<br> – 1000-V Charged-Device Model (C101)</li> <li>Supports Both Digital and Analog Applications: PCI Interface, Differential Signal Interface, Memory Interleaving, Bus Isolation, Low-Distortion Signal Gating</li></ul> <p><small></small></p></p>
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