SN74AVCH8T245PWR屬于集成電路（IC）的緩沖器驅(qū)動(dòng)器接收器收發(fā)器。由美國德州儀器公司制造生產(chǎn)的SN74AVCH8T245PWR緩沖器，驅(qū)動(dòng)器，接收器，收發(fā)器邏輯緩沖器、驅(qū)動(dòng)器、接收器和收發(fā)器允許隔離對某個(gè)電路的邏輯信號的訪問，以用于另一電路。緩沖器將其輸入信號（不變或反相）傳遞到其輸出，并可能用于清除弱信號或驅(qū)動(dòng)負(fù)載。在布爾邏輯仿真器中，緩沖器主要用于增加傳播延遲。邏輯接收器和收發(fā)器允許在數(shù)據(jù)總線之間進(jìn)行隔離通信。

1 Features

? Control inputs (DIR and OE) VIH and VIL levels are

referenced to VCCA voltage

? Bus hold on data inputs eliminates the need for

external pullup or pulldown resistors

? VCC isolation feature

? Fully configurable dual-rail design

? I/Os are 4.6-V tolerant

? Ioff supports partial-power-down mode operation

? Maximum data rates:

– 320Mbps (VCCA ≥ 1.8V and VCCB ≥ 1.8V)

– 170Mbps (VCCA ≤ 1.8V or VCCB ≤ 1.8V)

? Latch-up performance exceeds 100mA per JESD

78, class II

? ESD protection exceeds JESD 22:

– 8000-V Human-Body Model (A114-A)

– 200-V Machine Model (A115-A)

– 1000-V Charged-Device Model (C101)

2 Applications

? Personal electronics

? Industrial

? Enterprise

? Telecommunications

3 Description

The SN74AVCH8T245 is an 8-bit noninverting bus

transceiver that uses two separate configurable

power-supply rails. The A port is designed to track

VCCA, which accepts any supply voltage from 1.2V

to 3.6V. The B port is designed to track VCCB, which

also accepts any supply voltage from 1.2V to 3.6V.

This allows for universal low-voltage bidirectional

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

V, and 3.3-V voltage nodes.

The SN74AVCH8T245 is designed for asynchronous

communication between data buses. The device

transmits data from either the A bus to the B bus, or

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

level at the direction-control (DIR) input. The outputenable

(OE) input can be used to disable the outputs

so the buses are effectively isolated.

The design of SN74AVCH8T245 references the

control pins (DIR and OE) to VCCA.

Active bus-hold circuitry holds unused or undriven

inputs at a valid logic state. It is not recommended

to use pullup or pulldown 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.

The VCC isolation feature allows the outputs to be in

the high-impedance state when either VCCA or VCCB

is at GND. The bus-hold circuitry on the powered-up

side always stays active.

The SN74AVCH8T245 solution is compatible with a

single-supply system and can be replaced later with

a '245 function, with minimal printed circuit board

redesign.

To put the device in the high-impedance state during

power up or power down, OE must be tied to VCCA

through a pullup resistor; the current-sinking capability

of the driver determines the minimum value of the

resistor.