By Alvis J. Evans
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Although this series was faster than the 4000B series, it was not quite as fast as the 74LS TTL series. The 74C CMOS series also emerged on the scene, which was designed specifically to be pin-compatible with the TTL line. Another significant improvement in the CMOS family came with the development of the 74HC and the 74HCT series. Both these series, like the 74C series, were pin-compatible with the TTL 74 series. The 74HC (high-speed CMOS) series had the same speed as the 74LS as well as the traditional CMOS low-power consumption.
Off 0 Q4 X A B X 7409 C D C D Rpull-up 10K 0 A B +15V OUT Q4 +V CC 7433 output is grounded +5V Alternative gate representation +VCC Q3 D1 357 Vout +15V output "floats" Using a pull-up resistor with open collector logic gates. 7401 E F E F X = A B . C D . ( E+F ) Wired-AND logic: outputs of all three gates must float in order to get a HIGH output at X. 358 PRACTICAL ELECTRONICS FOR INVENTORS Another important feature of OC gates is their ability to sink large amounts of currents. For example, the 7506 OC inverter buffer/driver IC is capable of sinking 40 mA, which is 10 times the amount of current a standard 7404 inverter can sink.
For example, in the 4-bit system shown in Fig. 51, a BCD 4 (0100) picks up noise and becomes 0101 (or 5) before reaching its destination. Depending on the application, this type of error could lead to some serious problems. To avoid problems caused by unwanted data corruption, a parity generator/ checker system, like the one shown in Fig. 51, can be used. The basic idea is to add an extra bit, called a parity bit, to the digital information being transmitted. If the parity bit makes the sum of all transmitted bits (including the parity bit) odd, the transmitted information is of odd parity.
Basic Digital Electronics by Alvis J. Evans