SN74AS109A是TI公司的一款J-K触发器产品，SN74AS109A是具有清零和预设功能的双路 J-K 上升沿触发器，本页介绍了SN74AS109A的产品说明、应用、特性等，并给出了与SN74AS109A相关的TI元器件型号供参考。
SN74AS109A - 具有清零和预设功能的双路 J-K 上升沿触发器 - J-K触发器 - 触发器/锁存器/寄存器 - TI公司（Texas Instruments，德州仪器）
These devices contain two independent J-K\ positive-edge-triggered flip-flops. A low level at the preset () or clear () inputs sets or resets the outputs regardless of the levels of the other inputs. When and are inactive (high), data at the J and K\ inputs meeting the setup-time requirements are transferred to the outputs on the positive-going edge of the clock (CLK) 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 J and K\ inputs can be changed without affecting the levels at the outputs. These versatile flip-flops can perform as toggle flip-flops by grounding K\ and tying J high. They also can perform as D-type flip-flops if J and K\ are tied together.
The SN54ALS109A and SN54AS109A are characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ALS109A and SN74AS109A are characterized for operation from 0°C to 70°C.
- Package Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs
