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1FEATURES

? 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 = 4 Ω Typ)

? 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 Typ)

? Fast Switching Frequency (f OE = 20 MHz Max)

? Data and Control Inputs Provide Undershoot

Clamp Diodes

? Low Power Consumption (ICC = 0.25 mA Typ)

? 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

? ESD Performance Tested Per JESD 22

– 2000-V Human-Body Model

(A114-B, Class II)

– 1000-V Charged-Device Model (C101)

? Supports Both Digital and Analog

Applications: USB Interface, Differential Signal

Interface, Bus Isolation, Low-Distortion Signal

Gating

DESCRIPTION/ORDERING INFORMATION

The SN74CB3Q3306A is a high-bandwidth FET bus switch utilizing 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 SN74CB3Q3306A provides an optimized

interface solution ideally suited for broadband communications, networking, and data-intensive computing

systems.

The SN74CB3Q3306A is organized as two 1-bit switches with separate output-enable (1OE, 2OE) inputs. It can

be used as two 1-bit bus switches or as one 2-bit bus switch. When OE is low, the associated 1-bit bus switch is

ON and the A port is connected to the B port, allowing bidirectional data flow between ports. When OE is high,

the associated 1-bit bus switch is OFF, and a high-impedance state exists between the A and B ports.

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 VCC through a pullup

resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.