Logic Family Definition/Meaning:
A range of electronic devices that is made by the same
manufacturing technique and provides a number of logic functions. The range
includes logic gates, flip-flops, and counters. Families in common use are ECL, TTL, and
I2L, which are all based on bipolar transistors, and the NMOS and CMOS
families, which are based on MOSFETs. Logic families vary as regards switching
speed, propagation delay, and power dissipation,
although developments in the
fabrication technology of the different
families often improve these characteristics. A member of a logic family whose
output changes state typically within a few nanoseconds (109 seconds) is
considered a high-speed logic device. These devices are also characterized by
short propagation delays, also in the order of a few nanoseconds. See also logic
circuit.
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