SN74F74DR
双上升沿触发的D型触发器具有清零和预设 DUAL POSITIVE-EDGE-TRIGGERED D-TYPE FLIP-FLOPS WITH CLEAR AND PRESET
description
These devices contain two independent positive edge-triggered D-type flip-flops. A low level at the preset PRE or clear CLR inputs sets or resets the outputs regardless of the levels of the other inputs. When PRE and CLR are inactive high, data at the data D input meeting the setup time requirements is transferred to the outputs on the positive-going edge of the clock pulse. Clock triggering occurs at a voltage level and is not directly related to the rise time of the clock pulse. Following the hold-time interval, data at the D input may be changed without affecting the levels at the outputs.
• Package Options Include Plastic Small-Outline Packages, Ceramic Chip Carriers, and Standard Plastic and Ceramic 300-mil DIPs
