SN74AVC4T245DR.B中文资料德州仪器数据手册PDF规格书

1 Features

• Control inputs VIH/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

• ESD protection exceeds JESD 22:

– 8000V Human-Body Model (A114-A)

– 150V Machine Model (A115-A)

– 1000V Charged-Device Model (C101)

2 Applications

• Personal electronics

• 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 1.2V to 3.6V. The B port is designed to

track VCCB. VCCB accepts any supply voltage from

1.2V to 3.6V. The SN74AVC4T245 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 device 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 device is designed so that VCCA

supplies the control pins (1DIR, 2DIR, 1 OE, and 2

OE).

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 is designed so that if either

VCC input is at GND, then both ports are in the highimpedance

state.

To put 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.