why does the ttl family use a totem pole circuit on the output

Push–pull outputs are present in TTL and CMOS digital logic circuits and in some types of amplifiers, and are usually realized by a complementary pair of transistors, one dissipating or sinking current from the load to ground or a negative power supply, and the other supplying or sourcing current to the load from a positive power supply.Ī push–pull amplifier is more efficient than a single-ended 'class-A' amplifier. This kind of amplifier can enhance both the load capacity and switching speed.

JSTOR ( November 2017) ( Learn how and when to remove this template message)Ī Class B push–pull output driver using a pair of complementary PNP and NPN bipolar junction transistors configured as emitter followersĪ push–pull amplifier is a type of electronic circuit that uses a pair of active devices that alternately supply current to, or absorb current from, a connected load.

Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. Even after Very-Large-Scale Integration (VLSI) CMOS integrated circuit microprocessors made multiple-chip processors obsolete, TTL devices still found extensive use as glue logic interfacing between more densely integrated components.This article needs additional citations for verification. TTL became the foundation of computers and other digital electronics. Some TTL chips are now also made in surface-mount technology packages. TTL devices were originally made in ceramic and plastic dual in-line package(s) and in flat-pack form. Variations of the original TTL circuit design offered higher speed or lower power dissipation to allow design optimization. TTL manufacturers offered a wide range of logic gates, flip-flops, counters, and other circuits. The 7400 series by Texas Instruments became particularly popular.

Īfter their introduction in integrated circuit form in 1963 by Sylvania Electric Products, TTL integrated circuits were manufactured by several semiconductor companies. TTL integrated circuits (ICs) were widely used in applications such as computers, industrial controls, test equipment and instrumentation, consumer electronics, and synthesizers.

Why does the ttl family use a totem pole circuit on the output