| 摘要 |
The invention relates to a latch device and a latch method thereof. The latch device comprises a rectifying element, a capacitor, a first latch circuit, a filter circuit, an invalidation circuit and a second latch circuit, wherein, the rectifying element is connected with power wiring; the capacitor is connected with the forward side of the rectifying element; the first latch circuit operates under the capacitor voltage and latches input data according to a first latch signal; the filter circuit outputs a third latch signal and drives a second latch signal which is more delayed than the first latch signal to generate a third latch signal through a low-pass filter; the invalidation circuit invalidates the second latch signal by means of detecting reduced power supply voltage of power wiring; and the second latch circuit operates under the capacitor voltage and latches the output data of the first latch circuit according to the third latch signal. |
