SN74AVCH8T245 - 具有可配置电压转换和 3 态输出的 8 位双电源总线收发器

SN74AVCH8T245是TI德州仪器公司的一款方向控制电压转换产品，SN74AVCH8T245是具有可配置电压转换和 3 态输出的 8 位双电源总线收发器，本站介绍了SN74AVCH8T245的封装应用图解、特点和优点、功能等，并给出了与SN74AVCH8T245相关的TI元器件型号供参考。

SN74AVCH8T245 - 具有可配置电压转换和 3 态输出的 8 位双电源总线收发器 - 方向控制电压转换 - 电压电平转换 - 德州仪器

产品描述

产品特性

Control Inputs VIH/VIL Levels Are Referenced to VCCA Voltage
VCC Isolation Feature — If Either VCC Input Is at GND, All I/O Ports Are in the High-Impedance State
Ioff Supports Partial-Power-Down Mode Operation
Fully Configurable Dual-Rail Design Allows Each Port to Operate Over the Full 1.2-V to 3.6-V Power-Supply Range
I/Os Are 4.6-V Tolerant
Max Data Rates:
- 320 Mbps (VCCA ≤ 1.8 V and VCCB ≤ 1.8 V)
- 170 Mbps (VCCA ≥ 1.8 V or VCCB ≥ 1.8 V)
Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors
Latch-Up Performance Exceeds 100 mA 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)

DESCRIPTION/ORDERING INFORMATION

This 8-bit noninverting bus transceiver uses two separate configurable power-supply rails. The SN74AVCH8T245 is optimized to operate with VCCA/VCCB set at 1.4 V to 3.6 V. It is operational with VCCA/VCCB as low as 1.2 V. The A port is designed to track VCCA. VCCA accepts any supply voltage from 1.2 V to 3.6 V. The B port is designed to track VCCB. VCCB accepts any supply voltage from 1.2 V to 3.6 V. 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 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 output-enable (OE) input can be used to disable the outputs so the buses are effectively isolated.

The SN74AVCH8T245 is designed so the control pins (DIR and OE) are supplied by VCCA.

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.

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 ensures that if either VCC input is at GND, both outputs are in the high-impedance state. The bus-hold circuitry on the powered-up side always stays active.

Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended.

To ensure the high-impedance state during power up or power down, OE shall be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

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