FEATURES

· 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 W Typ)

· Low Input/Output Capacitance Minimizes

Loading (Cio(OFF) = 5 pF Typ)

· Data and Control Inputs Provide Undershoot

Clamp Diodes

· Low Power Consumption

(ICC = 20 mA Max)

· 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 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

DESCRIPTION/ORDERING INFORMATION

The SN74CB3T1G125 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 SN74CB3T1G125 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 1).

The SN74CB3T1G125 is a 1-bit bus switch with a single ouput-enable (OE) input. When OE is low, the 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 bus switch is OFF, and a high-impedance state exists between the A and B ports.