SN74CB3Q3305DCUR

The SN74CB3Q3305 is a high-bandwidth FET bus switch that utilizes a charge pump to boost the gate voltage of the pass transistor, providing a flat low on-state resistance (rₒₙ). The flat low on-state resistance enables very short propagation delays and allows switching of input voltages beyond the supply voltage range on the data I/O ports. The device also features low data I/O capacitance to minimize capacitive loading and signal distortion on the data bus. The SN74CB3Q3305 is designed to support high-bandwidth applications, offering an optimized interface solution well-suited for broadband communications, networking, and data-intensive computing systems. The device fully meets the specifications for partial power-down applications using Iₒff. The Iₒff circuit prevents damaging current backflow into the device when it is powered down. The device provides isolation when disabled.

Applications

• IP phones: wired and wireless
• Optical modules
• Fiber optic networks: fiber and EPON video
• PBX
• WiMAX and wireless infrastructure equipment
• USB, differential signal interfaces
• Bus isolation

Key features

• High-bandwidth data path (up to 500MHz)
• 5V-tolerant I/O supporting device power-up and power-down
• Flat, low on-state resistance (rₒₙ) across operating range (rₒₙ typical = 3Ω)
• Data I/O ports support input voltages beyond supply voltage range
• Switching range 0 to 5V at 3.3V VCC; 0 to 3.3V at 2.5V VCC
• Bidirectional data flow with near-zero propagation delay
• Low I/O capacitance minimizes load and signal distortion (Cio(OFF) typical = 3.5pF)
• Fast switching frequency (fOE max = 20MHz)
• Undershoot clamp diodes on data and control inputs
• Low power consumption (ICC typical = 0.25mA)
• VCC operating range: 2.3V to 3.6V
• Data I/O supports 0 to 5V signal levels (0.8V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, and 5V)
• Control inputs drivable by TTL or 5V/3.3V CMOS outputs
• Ioff supports partial power-down mode operation
• Latch-up performance exceeds 100mA per JESD 78 Class II