●The SN74CB3Q3305 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 SN74CB3Q3305 device provides an optimized interface solution ideally suited for broadband communications, networking, and data-intensive computing systems.
●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 GND through a pulldown resistor; the minimum value of the resistor is determined by the current-sourcing capability of the driver.
● High-Bandwidth Data Path (Up to 500 MHz(1))
● 5-V Tolerant I/Os With Device Powered Up or
●Powered Down
● Low and Flat ON-State Resistance (ron)
●Characteristics Over Operating Range
●(ron = 3 Ω Typical)
● Rail-to-Rail Switching on Data I/O Ports
● 0- to 5-V Switching With 3.3-V VCC
● 0- to 3.3-V Switching With 2.5-V VCC
● Bidirectional Data Flow With Near-Zero
●Propagation Delay
● Low Input/Output Capacitance Minimizes Loading
●and Signal Distortion
●(Cio(OFF) = 3.5 pF Typical)
● Fast Switching Frequency (fOE = 20 MHz
●Maximum)
● Data and Control Inputs Provide Undershoot
●Clamp Diodes
● Low Power Consumption (ICC= 0.25 mA Typical)
● VCC Operating Range From 2.3 V to 3.6 V
● 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)
● Control Inputs Can Be Driven by TTL or
●5-V/3.3-V CMOS Outputs
● Ioff Supports Partial-Power-Down Mode Operation
● Latch-Up Performance Exceeds 100 mA Per
●JESD 78, Class II
● APPLICATIONS
● IP Phones: Wired and Wireless
● Optical Modules
● Optical Networking: Video Over Fiber and EPON
● Private Branch Exchange (PBX)
● WiMAX and Wireless Infrastructure Equipment
● USB, Differential Signal interface
● Bus isolation
●(1) For additional information regarding the performance characteristics of the CB3Q family, refer to the TI application report, _CBT-C, CB3T, and CB3Q Signal-Switch Families_, SCDA008.
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