現在提供此產品的更新版本
具備升級功能，可直接投入使用替代所比較的裝置。
SN74AVCH8T245
- 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)
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 output-enable (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.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | SN74AVCH8T245 8-Bit Dual-Supply Bus Transceiver With Configurable Level-Shifting, Voltage Translation, and 3-State Outputs datasheet (Rev. J) | PDF | HTML | 2024/4/12 | ||
| 應用說明 | Schematic Checklist - A Guide to Designing With Fixed or Direction Control Translators | PDF | HTML | 2024/10/2 | |||
| 應用說明 | Schematic Checklist - A Guide to Designing with Auto-Bidirectional Translators | PDF | HTML | 2024/7/12 | |||
| 應用說明 | Understanding Transient Drive Strength vs. DC Drive Strength in Level-Shifters (Rev. A) | PDF | HTML | 2024/7/3 | |||
| 選擇指南 | Voltage Translation Buying Guide (Rev. A) | 2021/4/15 |
設計與開發
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