February 2019
Intermediate to advanced
237 pages
7h 11m
English
Content preview from Embedded System Interfacing
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Appendix A
TTL Logic
Abstract
This chapter reviews TTL logic characteristics built with bipolar transistors. As with CMOS, logic levels, current drive capability, and timing are critical requirements for interfacing logic.
Keywords
Digital logic; TTL; Bipolar transistor; Logic levels
A.1 Introduction
TTL logic [58] is based on bipolar transistors. TTL is less common today but the comparison to CMOS helps to underline why we need to adhere to certain specifications. Many different logic families have been created with different advantages and design characteristics.
A.2 TTL Logic Circuits
Fig. A.1 shows two types of bipolar transistors: NPN and PNP. The three terminals are known as the base, emitter, and collector. The base terminal of ...
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