 DESCRIPTION

The U74CB3Q3305 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 switching input voltage beyond the supply 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 U74CB3Q3305 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 pull down resistor; the

minimum value of the resistor is determined by the current-sourcing

capability of the driver.

 FEATURES

* Operation Voltage Range: 2.3 ~ 3.6V

* Low power consumption, 0.25mA Typ. ICC

* High-bandwidth data path (up to 500 MHz)

* 5V tolerant I/Os with device powered up or powered down

* Low and flat ON-state resistance (ron) characteristics over operating range (Ron = 3.5Ω typical)

* Supports input voltage beyond supply on data I/O ports

0 to 5V switching with 3.3V VCC

0 to 3.3V switching with 2.5V VCC

* Data I/Os support 0 to 5 V signaling levels (0.8V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, and 5V)

* Control inputs can be driven by TTL or 5V/3.3V CMOS outputs

* IOFF supports partial-power-down mode operation