1 Features

1• Output Voltage Translation Tracks VCC

• Supports Mixed-Mode Signal Operation on All

Data I/O Ports

– 5-V Input Down to 3.3-V Output Level Shift

With 3.3-V VCC

– 5-V/3.3-V Input Down to 2.5-V Output Level

Shift With 2.5-V VCC

• 5-V Tolerant I/Os With Device Powered Up or

Powered Down

• Bidirectional Data Flow With Near-Zero

Propagation Delay

• Low ON-State Resistance (ron) Characteristics (ron

= 5 Ω Typical)

• Low Input/Output Capacitance Minimizes Loading

(Cio(OFF) = 4.5 pF Typical)

• Data and Control Inputs Provide Undershoot

Clamp Diodes

• Low Power Consumption (ICC = 20 μA Maximum)

• V CC 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 250 mA Per

JESD 17

• ESD Performance Tested Per JESD 22

– 2000-V Human Body Model (A114-B, Class II)

– 1000-V Charged-Device Model (C101)

• Supports Digital Applications:

– Level Translation

– USB Interface

– Bus Isolation

• Ideal for Low-Power Portable Equipment

2 Applications

• Supports Digital Applications:

– Level Translation

– PCI Interface

– USB Interface

– Memory Interleaving

– Bus Isolation

3 Description

The SN74CB3T3306 device is a high-speed TTL-

compatible FET bus switch with low ON-state

resistance (ron), allowing for minimal propagation

delay. The device fully supports mixed-mode signal

operation on all data I/O ports by providing voltage translation that tracks VCC. The SN74CB3T3306

device supports systems using 5-V TTL, 3.3-V

LVTTL, and 2.5-V CMOS switching standards, as well

as user-defined switching levels (see Figure 5).