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Fundamentals of Digital Electronics

Describe and compare the characteristics of TTL and CMOS Logic families.

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DEFINITION:

THE GROUP OF COMPATIBLE DEVICES (INTEGRATED CIRCUITS) WITH THE SAME LOGIC LEVELS AND SUPPLY VOLTAGES ARE CALLED AS A DIGITAL LOGIC FAMILY

CMOS TTL
Use FETS Use BJTS
Symmetric Device Sourceand Drain Interchangeable Non Symmetric Device
Non InterchangeableCollector and Ēmmitor
Voltage Controlled Current,Device Current Controlled
Current Device
Very high Input Resistance =>
Very low power consumptionwhen not being used =>
Imperative for SmallIntegrated Device
Lower input Resistance
MOSFETS are nonlinear inworking conditions: BJTS are linear in activeregion, i.e.
$ ID α Vgs^2 $ Ic = a.lb
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