DE_MF

Characteristics OF Circuit Most widely used family for Combines high speed with l Usually operates from a sin Excellent noise immunity voltage.. Can be connected to a large Many forms – some with tpd Power consumption depend

F CMOS large-scale devices low power consumptionngle supply of 5 – 15 vy of about 30% of supply e number of gates (about 50).d down to 1 ns.ds on speed (perhaps 1 mw) 12

 Complementary MOS (CMOS complementary pairs as its bas uses both P-Channeland N-Chan When a HIGH is applied to the in off and N Channel MOSFET Q2 output to +VDD(DC supply volta Q1, resulting in a HIGH output.

S) logic usesthe MOSFET in sic element.A complementary pairnnel enhancement MOSFETs.nput, the P-Channel MOSFET Q1 is2 is on. This condition connects theage) through the “ON” resistance of 13



14

CMOS NAND Gate Op

peration 15



16

10.3 TTL DRIVING Current: no problem Output voltages VOH(min compared with VIH(min) of

G CMOS n) of TTL: too low when 17

TTL driving CMO

OS 18

CMOS DRIVING Driving TTL in the HIGH Sta Driving TTL in the LO series,74HC/74HCT series have no trouble driving series Concern fan-out problem Use buffer to interface low-c TTL

G TTL ate: no problem.OW State:Excepting 4000B a single TTL load of any current CMOS to high-current 19



20



21

CMOS driving TDriving TTL in the HIGH State:Driving TTL in the Lseries,74HC/74HCT serieshave no trouble driving aConcern fan-outproblemUse buffer to interface low-cur

TTL no problem.LOW State:Excepting 4000B single TTL load of any seriesrrent CMOS to high-current TTL. 22

ECL Circui ECL (Emitter-coupled logic ) is (CML) Based on bipolar transistors, but by preventing the transistors from Very fast operation propagation consumption, perhaps 60 mW/ga Low noise immunity of about 0.2-

it also known as current-mode logic t removes problems of storage timem saturating.n delays of 1ns or lesshigh powerate. -0.25 V. 23

I2 L CIRCUITS The integrated injection transistors in a kind of cur form its integrated circuit construct on an integrated c early VLSI circuits.

logic (IIL) uses bipolarrrent-steering arrangement tots. IIL is slightly easier tocircuit, and so was popular for 24

Thank

k you 25

Unit 11: Sem Memo

mi Conductor ories 1

Unit 11: Semi Conducto11.1 Types of Semicondu dynamic11.2 Explain the terms –Ac of RAM & ROM11.3 Explain differentPROM,EPROM,EEPROM,

or Memories 2Hrsuctor memories- Static & 1Hrccess time,speedahd capacity types of ROM-Flash ROM & NVRAM 1Hr 2

11.1 Types of Semico memories Semiconductor memory t element of today's electron semiconductor technology equipment that uses a proce semiconductor memory tec

onductor technology is an essential nics. Normally based aroundy, memory is used in any essor of one form or another. chnology used in computers 3

 RAM - Random Access suggest, the RAM or rando of semiconductor memory reading and writing data in used for such applications a memory where variables required on a random bas many times to and from this

Memory: As the namesom access memory is a form technology that is used forn any order as required. It isas the computer or processor and other stored and aresis. Data is stored and reads type of memory. 4

• ROM - Read Only Memo semiconductor memory tec is written once and then no used where data needs to when the power is re technologies lose the data o

ory: A ROM is a form ofchnology used where the dataot changed. In view of this it is be stored permanently, even emoved - many memoryonce the power is removed. 5

11.2 Access time, sp capacity of RAM &Access time: The time a program or deviceinformation and make it aprocessing. DRAM (dmemory) chips for personal com150 nanoseconds (billionths of a Static RAM (SRAM) has accessIdeally, the access time of memup with the CPU. If not, the CPUcycles, which makes it slower.

peed and& ROMtakes to locate a single piece ofavailable to the computer fordynamic random accessmputers have access times of 50 tosecond). s times as low as 10 nanoseconds.mory should be fast enough to keep will waste a certain number of clock 6

Speed RAM is measured in megabyte nanoseconds and RAM chips canCapacity To refer to storage space on dis or \"storage\". Typically, computers space. A typical desktop comp megabytes (32 or 64 million byte hold 4 to 80 gigabytes (4 to 80 bil

es and the speed is measured in n read data faster than ROM.sks, people usually say \"disk space\" s have much less memory than disk puter might come with 32 or 64es) of RAM, and a hard disk that can llion bytes). 7