SN74AVCH2T45DCTR.B中文资料德州仪器数据手册PDF规格书

1 Features

• Available in the Texas Instruments NanoFree™

Package

• VCC Isolation

• 2-Rail Design

• I/Os are 4.6V Tolerant

• Partial Power-Down-Mode Operation

• Bus Hold on Data Inputs

• Maximum Data Rates

– 500Mbps (1.8V to 3.3V)

– 320Mbps (< 1.8V to 3.3V)

– 320Mbps (Level-Shifting to 2.5V or 1.8V)

– 280Mbps (Level-Shifting to 1.5V)

– 240Mbps (Level-Shifting to 1.2V)

• Latch-Up Performance Exceeds 100mA Per JESD

78, Class II

• ESD Protection Exceeds JESD 22

2 Applications

• Smartphone

• Servers

• Desktop PCs and Notebooks

• Other Portable Devices

3 Description

This 2-bit non-inverting bus transceiver uses two

separate configurable power-supply rails. The A ports

are designed to track VCCA and accepts any supply

voltage from 1.2V to 3.6V. The B ports are designed

to track VCCB and accepts any supply voltage from

1.2V to 3.6V. This allows for universal low-voltage

bidirectional translation and level-shifting between any

of the 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V voltage nodes.

The SN74AVCH2T45 is designed for asynchronous

communication between two data buses. The logic

levels of the direction-control (DIR pin) input activate

either the B-port outputs or the A-port outputs. The

device transmits data from the A bus to the B bus

when the B-port outputs are activated and from

the B bus to the A bus when the A-port outputs

are activated. The SN74AVCH2T45 features active

bus-hold circuitry, which holds unused or un-driven

inputs at a valid logic state. TI does not recommend

using pull-up or pull-down resistors with the bus-hold

circuitry.

This device is fully specified for partial-power-down

applications using Ioff. The Ioff circuitry disables

the outputs, preventing damaging current backflow

through the device when it is powered down. The VCC

isolation feature ensures that if either VCC input is at

GND, then both outputs are in the high-impedance

state. The bus-hold circuitry on the powered-up side

always stays active.

Active bus-hold circuitry holds unused or un-driven

inputs at a valid logic state. NanoFree package

technology is a major breakthrough in IC packaging

concepts, using the die as the package.