SN54F109 and SN74F109 are dual J-K positive-edge-triggered flip-flops with clear and preset functions
The SN54F109 and SN74F109 are dual J‑K positive‑edge‑triggered flip‑flops that include independent clear (CLR) and preset (PRE) inputs. When PRE or CLR are low, the corresponding output is forced regardless of other inputs. The devices can be used as toggle flip‑flops, D‑type flip‑flops, or standard J‑K flip‑flops.
The document provides absolute maximum ratings, recommended operating conditions, electrical characteristics, timing specifications, and packaging information for both parts. It lists available package types such as plastic small‑outline packages, ceramic chip carriers, and standard 300‑mil DIP packages, and includes mechanical dimensions and tape‑and‑reel data.
| Supply voltage range (VCC) | –0.5 V to 7 V |
|---|---|
| Input voltage range (VI) | –1.2 V to 7 V |
| Operating temperature (SN54F109) | –55 °C to 125 °C |
The SN54F109 is specified for operation from –55 °C to 125 °C.
The devices can be powered with a supply voltage between –0.5 V and 7 V.
Available packages include plastic small‑outline packages, ceramic chip carriers, and standard plastic and ceramic 300‑mil DIP packages.