TI SN74CB3Q3245DGVR

The SN74CB3Q3245 is a high-bandwidth FET bus switch that uses a charge pump to boost the gate voltage of the transmission transistors, thereby 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 reduce the capacitive load and signal distortion on the data bus.

The SN74CB3Q3245 is designed to support high-bandwidth applications and provides an optimized interface solution, making it well-suited for broadband communications, networking, and data-intensive computing systems.

The SN74CB3Q3245 is organized as an 8-bit bus switch with a single output enable (OE) input. When OE is low, the bus switch is in the on state, and Port A is connected to Port B, allowing bidirectional data flow between the ports. When OE is high, the bus switch is off, and there is a high-impedance state between Port A and Port B.

The device is fully suitable for partial power-down applications using 10H. The loff circuit prevents harmful reverse current from flowing through the device during power-down. The device has isolation functionality during power-down.

To ensure a high-impedance state during power-up or power-down, OE should be connected to VCC through a pull-up resistor; the minimum value of this resistor is determined by the current-sinking capability of the driver.

• PCI interface
• Differential signal interface
• Memory interleaving
• Bus isolation
• Low-distortion signal gating