74AVC4T245QRGYRQ1屬于集成電路（IC）的緩沖器驅(qū)動器接收器收發(fā)器。由美國德州儀器公司制造生產(chǎn)的74AVC4T245QRGYRQ1緩沖器，驅(qū)動器，接收器，收發(fā)器邏輯緩沖器、驅(qū)動器、接收器和收發(fā)器允許隔離對某個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

? Qualified for automotive applications

? AEC-Q100 qualified with the following results:

– Device temperature grade 1: –40°C to 125°C

ambient operating temperature range

– Device HBM ESD classification level H3B

(JESD 22 A114-A)

– Device CDM ESD classification level C5 (JESD

22 C101)

? Function safety capable

? Control input VIH and VIL levels are referenced to

VCCA voltage

? Fully configurable dual-rail design allows each port

to operate over the full 1.2V to 3.6V power-supply

range

? I/Os are 4.6V tolerant

? Ioff supports partial power-down-mode operation

? Maximum 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

2 Applications

? Telematics

? Cluster

? Head unit

? Navigation systems

3 Description

This 4-bit non-inverting bus transceiver uses two

separate configurable power-supply rails. The A port

is designed to track VCCA. VCCA accepts any supply

voltage from 1.2V to 3.6V. The B port is designed to

track VCCB. VCCB accepts any supply voltage from

1.2V to 3.6V. The SN74AVC4T245-Q1 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 bidirectional

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

and 3.3V voltage nodes.

The SN74AVC4T245-Q1 is designed for

asynchronous communication between two data

buses. The logic levels of the direction-control (DIR)

input and the output-enable ( OE) input activate either

the B-port outputs or the A-port outputs or place

both output ports into the high-impedance mode. 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 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 SN74AVC4T245-Q1 is designed so that the

control pins (1DIR, 2DIR, 1 OE, and 2 OE) are

supplied by VCCA.

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 design of the VCC isolation feature places both

ports in the high-impedance state if either VCC input is

at GND.

To place the device in the high-impedance state

during power up or power down, tie OE to VCC

through a pullup resistor; the current-sinking capability

of the driver determines the minimum value of the

resistor.