SN74AVC4T774BQBR中文资料德州仪器数据手册PDF规格书

1 Features

• Each channel has an independent DIR control

input

• Control inputs VIH/VIL levels are referenced to

VCCA voltage

• Fully configurable dual-rail design allows each port

to operate over the full 1.1V to 3.6V power-supply

range

• I/Os are 4.6V tolerant

• Ioff Supports partial power-down-mode operation

• Typical data rates

– 380Mbps (1.8V to 3.3V translation)

– 200Mbps (<1.8V to 3.3V translation)

– 200Mbps (translate to 2.5V or 1.8V)

– 150Mbps (translate to 1.5V)

– 100Mbps (translate to 1.2V)

• Latch-up performance exceeds 100mA Per JESD

78, class II

• ESD Protection exceeds the following levels

(tested per JESD 22)

– ±8000V Human-body model (A114-A)

– 250V Machine model (A115-A)

– ±1500V Charged-device model (C101)

2 Applications

• Personal electronic

• Industrial

• Enterprise

• Telecom

3 Description

This 4-bit noninverting bus transceiver uses two

separate configurable power-supply rails. The A port

is designed to track VCCA. VCCA accepts any supply

voltage from 1.1V to 3.6V. The B port is designed

to track VCCB. VCCB accepts any supply voltage

from 1.1 to 3.6V. The SN74AVC4T774 is optimized

to operate with VCCA/VCCB set at 1.4V to 3.6V.

It is operational with VCCA/VCCB as low as 1.2V.

This allows for universal low-voltage bi-directional

translation between any of the 1.2V, 1.5V, 1.8V, 2.5V,

and 3.3V voltage nodes.

The SN74AVC4T774 is designed for asynchronous

communication between data buses. The logic levels

of the direction-control (DIR) input and the outputenable

(OE) input activate either the B-port outputs

or the A-port outputs or place both output ports in

the high-impedance mode. The device transmits data

from the A bus to the B bus when the B outputs are

activated, and from the B bus to the A bus when the

A outputs are activated. The input circuitry on both A

and B ports is always active and must have a logic

HIGH or LOW level applied to prevent excess ICC and

ICCZ.

The SN74AVC4T774 is designed so that the control

pins (DIR1, DIR2, DIR3, DIR4, and OE) are supplied

by VCCA. This device is fully specified for partialpower-

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 ports are in the highimpedance

state.

For a high-impedance state during power-up or

power-down, OE should be tied to VCCA through a

pullup resistor; the minimum value of the resistor

is determined by the current-sinking capability of

the driver. Since this device has CMOS inputs, it

is very important to not allow them to float. If the

inputs are not driven to either a high VCC state,

or a low-GND state, an undesirable larger than

expected ICC current may result. Since the input

voltage settlement is governed by many factors

(for example, capacitance, board-layout, package

inductance, surrounding conditions, and so forth),

ensuring that they these inputs are kept out of

erroneous switching states and tying them to either

a high or a low level minimizes the leakage-current.