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).