ZHCSSC5E november   1988  – june 2023 SN74HCT257

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 说明
  4. 3 Revision History
  5. 4 Pin Configuration and Functions
  6.   6
  7. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 Recommended Operating Conditions #GUID-E2584F18-4229-491B-88C0-5C0565546F3D/GUID-6412D0F1-0296-497F-B98D-0D6926824395
    3. 5.3 Thermal Information
    4. 5.4 Electrical Characteristics
    5. 5.5 Switching Characteristics
    6. 5.6 Switching Characteristics
    7. 5.7 Operating Characteristics
  8. 6 Parameter Measurement Information
  9. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
  10. 8 Device Functional Modes
  11. 9 Power Supply Recommendations
  12. 10Layout
    1. 10.1 Layout Guidelines
  13. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 接收文档更新通知
    3. 11.3 支持资源
    4. 11.4 Trademarks
    5. 11.5 静电放电警告
    6. 11.6 术语表
  14. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Tape and Reel Information
    2. 12.2 Mechanical Data

封装选项

请参考 PDF 数据表获取器件具体的封装图。

机械数据 (封装 | 引脚)
  • N|16
  • D|16
散热焊盘机械数据 (封装 | 引脚)
订购信息

7.1 Overview

The ’HCT257 devices are designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems. The 3-state outputs do not load the data lines when the output-enable (OE) input is at the high logic level.

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