TTL BHAGWAN MAHAVIR COLLEGE OF ENGINEERING AND TECHNOLOGY, SURAT

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Presentation transcript:

TTL BHAGWAN MAHAVIR COLLEGE OF ENGINEERING AND TECHNOLOGY, SURAT SUBJECT : D.E (2131004) GUIDED BY : Ms. HENAL PATEL Date of submission:15-10-2014 PRESENTED BY : Patel Jinal S. ENROLLMENT NO : 130060131040 SEMESTER:3rd COMPUTER SCIENCE & ENGINEERING BMCET 1 1

Logic Families We have seen that different devices use different voltages ranges for their logic levels They also differ in other characteristics In order to assure correct operation when gates are interconnected they are normally produced in families The most widely used families are: complementary metal oxide semiconductor (CMOS) transistor-transistor logic (TTL) emitter-coupled logic (ECL) 2

Introduction TTL was developed in 1965.Through the years basic TTL has been improved to meet performance requirements. There are many versions or families of TTL. For example High Speed TTL (twice as fast, twice as much power) Low Power TTL (1/10 the speed, 1/10 the power of “standard" TTL) Schottky TTL etc. (for high-frequency uses ) TTL logic families have three configurations for outputs Totem pole output Open collector output Tri state output 3

Fig. TTL NAND gate circuit diag.[1] Two input TTL NAND gate Fig. TTL NAND gate circuit diag.[1] 4

TTL Logic State Analysis B Q1 Q2 Q3 Q4 Y ON OFF 1 5

Advantage of totem pole Low power dissipation Fast switching 6

Tri-state(3-state)TTL Fig. Tri-state TTL circuit diag.[1] 7

Tri-state (3-state) TTL Truth table EN (Enable input) IN (A) Y (output) X HI-Z 1 8

TTL sub families Standard TTL ,74 series Low power TTL , 74L series High speed TTL , 74H series 9

References [1] A . Anand Kumar, “Fundamentals of Digital Circuits”, Pp:733-744, PHI India, June 2011. 10

THANK YOU 4/22/2018 11