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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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在数据表中,通用逻辑IC的上升时间和下降时间是在保证其功能运行的工作范围内指定的。请在工作范围内使用通用逻辑IC,以防止因输出振荡等原因导致的故障。
如果将缓慢上升或下降的信号(低转换速率信号)施加到输入端,则在开关过程中会出现尖峰电流,导致VCC和GND反弹,从而可能导致输出振荡或故障。
使用带有施密特触发器输入端的IC实现缓慢变化的输入。然而,如果输入变化过慢,即使是带有施密特触发器输入端的IC也可能无法抑制电源线或信号线上的噪声,从而导致输出振荡或不稳定。
表-1列出了每个系列中典型IC*1的上升和下降时间。
类型 |
系列名称 |
CMOS逻辑IC 系列编号 |
单门逻辑(L-MOS)等效电路 |
工作电压范围 VCC(V) |
传输延迟时间 *1,tpLH,tpHL(ns) |
输出电流*2,IOUT(mA) |
上升和下降时间@3.3 V |
上升和下降时间@5 V |
---|---|---|---|---|---|---|---|---|
适用于5V系统 |
标准 |
3至18 |
200 |
±0.51 |
0~10 [μs/V]*4 |
0~5 [μs/V]*4 |
||
高速 |
2至6 |
23 |
±4.0 or 6.0 |
0~1 [μs/V] |
0~500 [ns/V] |
|||
4.5至5.5 |
31 |
0~500 [ns/V] |
||||||
进阶型 |
2至5.5 |
8.5 |
±24 |
0~100 [ns/V] |
0~20 [ns/V] |
|||
4.5至5.5 |
9.0 |
0~10 [ns/V] |
||||||
超高速 |
2至5.5 |
8.5 |
±8.0 |
0~100 [ns/V] |
0~20 [ns/V] |
|||
10 |
- *3 |
- *3 |
||||||
4.5至5.5 |
9.5 |
0~20 [ns/V] |
||||||
1.8至5.5 |
8.5 |
± 16 |
0~20 [ms/V] |
0~1 [ms/V] |
||||
适用于低压系统 |
低压 |
1.65至3.6 |
6.5 |
± 24 |
0~10 [ns/V] |
|||
超低压 | 1.2至3.6 |
4.2 |
± 24 |
0~10 [ns/V] |
*1:典型IC(TC4001、TC74HC244、TC74HCT244、TC74AC244、TC74ACT244、74VHC244、74VHC9541(An-Yn)、VHCT244、VHCV244、74LCX244和TC74VCX244)在-40至85°C时的最大传输延迟时间,但TC4001显示的是25°C时最大传输延迟时间。
*2:数据表的直流特性表中规定了输出电流值。此外,绝对最大额定值还指定了电流。
*3:未指定上升和下降时间,因为TC74VHC9系列和74VHC9系列带有施密特触发器输入端。
*4:数据表中未指定上升和下降时间。上面显示的数值仅应作为设计创建指南。
以下文档也包含相关信息。