* : Products list (parametric search)
* : Products list (parametric search)
* : Products list (parametric search)
* : Products list (parametric search)
* : Products list (parametric search)
* : Products list (parametric search)
* : Products list (parametric search)
* : Products list (parametric search)
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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.TOSHIBA is not responsible for any incorrect or incomplete information. Information is subject to change at any time without notice.
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通常所有未使用的输入端都应连接到VCC或GND。(图1)因为通用逻辑IC的输入阻抗非常高,如果保持开路状态,可能会因周围电场的影响而输出意外值。另外,在中点电位处电流流过,电流消耗增大,有时会导致元件损坏。
如果输入引脚没有总线保持功能并且数据表中没有特殊说明,请采取上述操作。
然而,对于有可能成为输出端(如245等双向总线缓冲器)的引脚(总线引脚等),请通过上拉/上拉电阻将输入/输出两端连接到电源或GND。(图2)
建议将缓冲器两端上拉或下拉至相同电位,以避免不必要的电流。然而,请将带有总线保持功能的输入引脚(如TC74VCXHxxx系列IC的输入引脚)保持开路。即使对于典型的通用IC,当接通电源时,由于寄生电容(几毫安级)引起的大浪涌电流也可能成为一个问题。为提升系统可靠性,防止器件损坏和其他故障,其输入端可通过上拉电阻连接到VCC,或通过下拉电阻连接到GND。
以下文档也包含相关信息。