Digital Logic Fundamentals Unit 8 – TTL and CMOS Comparison
UNIT 8 – TTL AND CMOS COMPARISON
UNIT OBJECTIVE
At the completion of this unit, you will be able to determine the differences between a TTL gate
and a CMOS gate by comparing static and dynamic transfer characteristics.
UNIT FUNDAMENTALS
TTL and CMOS DIFFERENCES
TTL is an abbreviation for Transistor-Transistor Logic. A TTL inverter schematic is shown. A
TTL logic gate is configured with bipolar transistors, which are current devices.
CMOS is an abbreviation for Complementary Metal-Oxide Semiconductor. A CMOS inverter
schematic is shown. A CMOS logic gate is configured with field-effect transistors (FETs), which
are voltage devices.