16 Facts About TTL logic

Transistor–transistor logic is a logic family built from bipolar junction transistors.

TTL logic integrated circuits were widely used in applications such as computers, industrial controls, test equipment and instrumentation, consumer electronics, and synthesizers.

TTL logic devices were originally made in ceramic and plastic dual in-line package and in flat-pack form.

Some TTL logic chips are now made in surface-mount technology packages.

TTL logic became the foundation of computers and other digital electronics.

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The first commercial integrated-circuit TTL devices were manufactured by Sylvania in 1963, called the Sylvania Universal High-Level Logic family.

TTL logic became popular with electronic systems designers after Texas Instruments introduced the 5400 series of ICs, with military temperature range, in 1964 and the later 7400 series, specified over a narrower range and with inexpensive plastic packages, in 1966.

Typically, TTL logic chips integrate no more than a few hundred transistors each.

TTL logic became important because its low cost made digital techniques economically practical for tasks previously done by analog methods.

The 1973 Xerox Alto and 1981 Star workstations, which introduced the graphical user interface, used TTL circuits integrated at the level of arithmetic logic units and bitslices, respectively.

The output stage of the most common TTL logic gates is specified to function correctly when driving up to 10 standard input stages.

TTL logic outputs are typically restricted to narrower limits of between 0.

Standardization of the TTL logic levels is so ubiquitous that complex circuit boards often contain TTL logic chips made by many different manufacturers selected for availability and cost, compatibility being assured.

TTL logic is particularly well suited to bipolar integrated circuits because additional inputs to a gate merely required additional emitters on a shared base region of the input transistor.

TTL logic devices consume substantially more power than equivalent CMOS devices at rest, but power consumption does not increase with clock speed as rapidly as for CMOS devices.

TTL logic is less sensitive to damage from electrostatic discharge than early CMOS devices.