SN74AXC4T245PWRG4中文资料德州仪器数据手册PDF规格书

1 Features

• Fully configurable dual-rail design allows each port

to operate with a power supply range from 0.65V

to 3.6V

• Operating temperature from –40°C to +125°C

• Multiple direction control pins to allow

simultaneous up and down translation

• Glitch-free power supply sequencing

• Up to 380Mbps support when translating from 1.8V

to 3.3V

• VCC isolation feature:

– If either VCC input is below 100mV, all

I/Os outputs are disabled and become highimpedance

• Ioff supports Partial-Power-Down mode operation

• Compatible with AVC family level shifters

• Latch-up performance exceeds 100mA per JESD

78, Class II

• ESD protection exceeds JESD 22:

– 8000V Human-Body Model

– 1000V Charged-Device Model

2 Applications

• Enterprise and communications

• Industrial

• Personal electronics

• Wireless infrastructure

• Building automation

• Point of sale

3 Description

The SN74AXC4T245 is a four-bit noninverting bus

transceiver that uses two individually configurable

power-supply rails. The device is operational with both

VCCA and VCCB supplies as low as 0.65V. The A port

is designed to track VCCA, which accepts any supply

voltage from 0.65V to 3.6V. The B port is designed

to track VCCB, which also accepts any supply voltage

from 0.65V to 3.6V. Additionally the SN74AXC4T245

is compatible with a single-supply system.

The SN74AXC4T245 device is designed for

asynchronous communication between data buses.

The device transmits data from the A bus to the B bus

or from the B bus to the A bus, depending on the logic

level of the direction-control inputs (1DIR and 2DIR).

The output-enable inputs (1 OE and 2 OE) are used

to disable the outputs so the buses are effectively

isolated. The SN74AXC4T245 device is designed so

the control pins (xDIR and x OE) are referenced to

VCCA.

To put the level shifter I/Os in the high-impedance

state during power up or power down, tie the xOE

pins to VCCA through a pullup resistor.

This device is fully specified for partial-power-down

applications using the Ioff current. The Ioff protection

circuitry ensures that no excessive current is drawn

from or to an input, output, or combined I/O that

is biased to a specific voltage while the device is

powered down.

The design of the VCC isolation feature allows both

I/O ports to enter a high-impedance state by disabling

their outputs if either VCCA or VCCB is less than

100mV.

Glitch-Free power supply sequencing allows either

supply rail to be powered on or off in any order while

providing robust power sequencing performance.