Digital Systems: Principles and Design

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Digital Systems

6.11 SPEED, PROPAGATION DELAY, OPERATING FREQUENCY, POWER

DISSIPATED PER GATE, SUPPLY VOLTAGE LEVELS, OPERATIONAL

VOLTAGE LEVELS THAT DEFINE LOGIC STATES 1 AND 0 FOR

VARIOUS FAMILIES OF GATES

Table 6.2 gives the abbreviation for a family, measure of speed per gate and power

dissipation of per gate for these families of the logic gates.

TABLE 6.2

S. No. Family name Abbreviation for the Propagation Power dissipated Maximum

family (Other than Delay ns per gate operating frequency

standard) mW MHz

1 Standard TTL - 10 10 30

2 Low Power TTL L 33 1 3

3 High Speed TTL H 6 24 50

4 Schottky TTL S 3 19 100

5 Low Power ...