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  • SN74AVC4T245 具有可配置电压转换和三态输出的 2 位总线收发器

    • ZHCSTK4I June   2004  – February 2025 SN74AVC4T245

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  • SN74AVC4T245 具有可配置电压转换和三态输出的 2 位总线收发器
  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  Recommended Operating Conditions
    4. 5.4  Thermal Information
    5. 5.5  Electrical Characteristics
    6. 5.6  Operating Characteristics
    7. 5.7  Switching Characteristics: VCCA = 1.2V
    8. 5.8  Switching Characteristics: VCCA = 1.5V ± 0.1V
    9. 5.9  Switching Characteristics: VCCA = 1.8V ± 0.15V
    10. 5.10 Switching Characteristics: VCCA = 2.5V ± 0.2V
    11. 5.11 Switching Characteristics: VCCA = 3.3V ± 0.3V
    12. 5.12 Typical Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Fully Configurable Dual-Rail Design
      2. 7.3.2 Supports High Speed Translation
      3. 7.3.3 Ioff Supports Partial-Power-Down Mode Operation
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 接收文档更新通知
    2. 9.2 支持资源
    3. 9.3 Trademarks
    4. 9.4 静电放电警告
    5. 9.5 术语表
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
  13. 重要声明
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Data Sheet

SN74AVC4T245 具有可配置电压转换和三态输出的
2 位总线收发器

本资源的原文使用英文撰写。 为方便起见,TI 提供了译文;由于翻译过程中可能使用了自动化工具,TI 不保证译文的准确性。 为确认准确性,请务必访问 ti.com 参考最新的英文版本(控制文档)。

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1 特性

  • 控制输入 VIH/VIL 电平以 VCCA 电压为基准
  • 完全可配置的双轨设计,支持各个端口在 1.2V 至 3.6V 的整个电源电压范围内运行
  • I/O 可耐受 4.6V 电压
  • Ioff 支持局部断电模式运行
  • 最大数据速率:
    • 380Mbps(1.8V 至 3.3V 转换)
    • 200Mbps(< 1.8V 至 3.3V 转换)
    • 200Mbps(转换至 2.5V 或 1.8V)
    • 150Mbps(转换至 1.5V)
    • 100Mbps(转换至 1.2V)
  • 闩锁性能超过 100mA,符合 JESD 78 II 类规范的要求
  • ESD 保护性能超过 JESD 22 规范要求:
    • 8000V 人体放电模型 (A114-A)
    • 150V 机器放电模型 (A115-A)
    • 1000V 充电器件模型 (C101)

2 应用

  • 个人电子产品
  • 工业
  • 企业
  • 电信

3 说明

这款 4 位同相总线收发器使用两个独立的可配置电源轨。A 端口旨在跟踪 VCCA。VCCA 电源电压为 1.2V 至 3.6V。B 端口旨在跟踪 VCCB。VCCB 电源电压为
1.2V 至 3.6V。SN74AVC4T245 经过优化,可在 VCCA/VCCB 设置为 1.4V 至 3.6V 的范围内正常运行。该器件可在 VCCA/VCCB 低至 1.2V 的情况下正常运行,因此可在 1.2V、1.5V、1.8V、2.5V 和 3.3V 电压节点之间进行通用的低电压双向转换。

SN74AVC4T245 器件旨在实现两条数据总线间的异步通信。方向控制 (DIR) 输入和输出使能 (OE) 输入的逻辑电平激活 B 端口输出或者 A 端口输出,或者将两个输出端口都置于高阻抗模式。当 B 端口输出被激活时,此器件将数据从 A 总线发送到 B 总线,而当 A 端口输出被激活时,此器件将数据从 B 总线发送到 A 总线。A 端口和 B 端口上的输入电路一直处于激活状态并且必须施加一个逻辑高或低电平,从而防止过大的 ICC 和 ICCZ。

SN74AVC4T245 器件旨在使 VCCA 为控制引脚(1DIR、2DIR、1 OE 和 2 OE)供电。

该器件专用于使用 Ioff 的局部断电应用。Ioff 电路可禁用输出,以防在器件断电时电流回流对器件造成损坏。

VCC 隔离特性可确保任一 VCC 输入接地时,两个端口都处于高阻抗状态。

要在上电或断电期间将器件置于高阻抗状态,应通过一个上拉电阻器将 OE 连接至 VCC;该电阻器的最小值由驱动器的电流灌入能力决定。

封装信息
器件型号 封装(1) 封装尺寸(2)
SN74AVC4T245 D(SOIC,16) 9.9mm × 6mm
DGV(TVSOP,16) 3.6mm × 6.4mm
PW(TSSOP,16) 5mm × 6.4mm
RGY(WQFN,16) 4mm × 3.5mm
RSV (UQFN, 16) 2.6mm × 1.8mm
BQB(WQFN,16) 3.5mm × 2.5mm
DYY(SOT,16) 4.2mm × 2mm
(1) 有关更多信息,请参阅节 11。
(2) 封装尺寸(长 × 宽)为标称值,并包括引脚(如适用)。
SN74AVC4T245 SN74AVC4T245 半侧逻辑图(正逻辑)SN74AVC4T245 半侧逻辑图(正逻辑)

4 Pin Configuration and Functions

SN74AVC4T245 D, DGV, or PW Package,
                        16-Pin SOIC, TVSOP, or PW (Top View)Figure 4-1 D, DGV, or PW Package, 16-Pin SOIC, TVSOP, or PW (Top View)
SN74AVC4T245 RSV Package, 16-Pin UQFN
                        (Top View)Figure 4-3 RSV Package, 16-Pin UQFN (Top View)
SN74AVC4T245 DYY Package, 16-Pin SOT
                        (Top View)Figure 4-5 DYY Package, 16-Pin SOT (Top View)
SN74AVC4T245 RGY Package, 16-Pin WQFN
                        (Top View)Figure 4-2 RGY Package, 16-Pin WQFN (Top View)
SN74AVC4T245 BQB/WBQB Package, 16-Pin
                        WQFN (Transparent Top View)Figure 4-4 BQB/WBQB Package, 16-Pin WQFN (Transparent Top View)
Table 4-1 Pin Functions
PIN NO. TYPE(1) DESCRIPTION
NAME D, DGV, PW, RGY RSV
1A1 4 6 I/O Input/output 1A1. Referenced to VCCA.
1A2 5 7 I/O Input/output 1A2. Referenced to VCCA.
1B1 13 15 I/O Input/output 1B1. Referenced to VCCB.
1B2 12 14 I/O Input/output 1B2. Referenced to VCCB.
1DIR 2 4 I Direction-control input for ‘1’ ports
1 OE 15 1 I 3-state output-mode enables. Pull OE high to place ‘1’ outputs in 3-state mode. Referenced to VCCA.
2A1 6 8 I/O Input/output 2A1. Referenced to VCCA.
2A2 7 9 I/O Input/output 2A2. Referenced to VCCA.
2B1 11 13 I/O Input/output 2B1. Referenced to VCCB.
2B2 10 12 I/O Input/output 2B2. Referenced to VCCB.
2DIR 3 5 I Direction-control input for ‘2’ ports
2 OE 14 16 I 3-state output-mode enables. Pull OE high to place ‘2’ outputs in 3-state mode. Referenced to VCCA.
GND 8, 9 10, 11 — Ground
VCCA 1 3 — A-port power supply voltage. 1.2V ≤ VCCA ≤ 3.6V
VCCB 16 2 — B-port power supply voltage. 1.2V ≤ VCCB ≤ 3.6V
(1) I = input, O = output

5 Specifications

5.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)
MIN(1)MAXUNIT
VCCA
VCCB
Supply voltage range–0.54.6V
VIInput voltage range(2)I/O ports (A port)–0.54.6V
I/O ports (B port)–0.54.6
Control inputs–0.54.6
VOVoltage range applied to any output in the high-impedance or power-off state(2)A port–0.54.6V
B port–0.54.6
VOVoltage range applied to any output in the high or low state(2)(3)A port–0.5VCCA + 0.5V
B port–0.5VCCB + 0.5
IIKInput clamp currentVI < 0–50mA
IOKOutput clamp currentVO < 0–50mA
IOContinuous output current±50mA
Continuous current through VCCA, VCCB, or GND±100mA
TstgStorage temperature range

-65

150

°C

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions is not implied. Exposure to absolute maximum rated conditions for extended periods may affect device reliability.
(2) The input voltage and output negative-voltage ratings may be exceeded if the input and output current ratings are observed.
(3) The output positive-voltage rating may be exceeded up to 4.6V maximum if the output current rating is observed.

5.2 ESD Ratings

MINMAXUNIT
V(ESD)Electrostatic dischargeHuman body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins(1)8kV
Charged device model (CDM), per JEDEC specification JESD22-C101, all pins(2)1
Machine model (C101)150V
(1) JEDEC document JEP155 states that 500V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250V CDM allows safe manufacturing with a standard ESD control process.

 

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