TI SN74CB3Q3244DGVR

The SN74CB3Q3244 is a high-bandwidth FET bus switch that uses a charge pump to boost the gate voltage of the transmission transistors, providing a low and flat on-state resistance (r_on). The low and flat on-state resistance minimizes 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. The SN74CB3Q3244 is specifically designed to support high-bandwidth applications, offering an optimized interface solution that is well-suited for broadband communication, networking, and data-intensive computing systems.

The SN74CB3Q3244 is organized as two 4-bit bus switches with separate output enable (1OE, 2OE) inputs. It can be used as two 4-bit bus switches or one 8-bit bus switch. When OE is low, the corresponding 4-bit bus switch closes, connecting Port A to Port B and allowing bidirectional data flow between the ports. When OE is high, the corresponding 4-bit bus switch opens, and a high-impedance state exists between Ports A and B.

The device is fully specified for partial-power-down applications using I_off. The I_off circuitry prevents damaging current backflow through the device during power-down. The device provides isolation during power-down. To ensure a high-impedance state during power-up or power-down, OE should be connected to V_CC through a pull-up resistor; the minimum value of the resistor is determined by the sink current capability of the driver.

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