Lansdale Semiconductor, Inc. Presettable BCD/Decade Up/Down Counter 54190/E,F

The 5400/7400 series of transistor-transistor logic consists of medium speed TTL integrated circuits. This high noise immunity family was designed for general digital logic applications requiring clock frequencies to 30MHz and switching speeds in the 12-15 ns range under moderate capacitive loading.

The 5400/7400 series of transistor-transistor logic is a medium-speed, high-noise-immunity family of saturating integrated logic circuits designed for general digital logic applications requiring clock frequencies to 30MHz and switching speeds in the 12-15 ns range under moderate capacitive loading.