基于宇航用译码器开关时间特性研究

Research of Switching Time Characteristics Based on Aerospace-used Decoders

宇航用译码器在满足其基本译码功能正常的基础上,在复杂电气环境使用中,译码器要保证其开关时间参数传输延迟时间及输出转换时间满足使用要求。在复杂电气环境条件下即不同负载以及不同输入电压情况下,对器件各输出引脚的开关时间参数进行了测试,测试结果表明被测试器件传输延迟时间最大值为2.1214μs,输出高低电平转换时间最大值分别为1.6769μs与8.1214μs,被验证器件的开关时间特性参数随输入电压的增加而减小,随负载电容的变大而延长。该开关时间特性的研究为产品设计在复杂电气环境条件下对器件的使用,提供有效的趋势判断与数据支撑。

Aerospace-used decoders need to guarantee not only the basic decoding function,but also the switching time characteristics including transmission delay and output switching time to meet the application requirement in the complex electrical environment. The the switching time parameters of every output pin in cases of different output loads and input voltages are tested. The test result shows that the max transmission delay of the decoder is 2. 1214μs,the max output transmission time from high voltage to low voltage is 1. 6769μs and the one from low voltage to high voltage is 8. 1214μs. The switching time characteristic parameters decrease with the input voltage increased,and increase with larger load capacitance. This research provided an effective trend judgment and data support for design in a complex electromagnetic environment conditions.