The low-power Schottky clamped TTL logic family (74LS series) was released i〇 1975. This, as the name suggests, has a lower power dissipation than the 74S series. A circuit diagram for a two-input NAN...

The standard TTL series has a typical propagation delay of 10ns (the term propagation delay was introduced in Chapter 4 and will be covered in more detail later hauler) By this we mean that when an in...

At the output of all gates there is a capacitive load (CL) caused by the input capacitance of the next stage. This could be a printed circuit board interconnect or quite simply an oscilloscope lead....

Diode transistor logicThe DTL or diode transistor logic first became available commercially in 1962. The circuit diagram for a two-input DTL NAND gate is shown in Fig. 9.2(a) and although it is no lon...

The bipolar junction transistor or BJT as it is more commonly known can be considered in digital terms as a simple single-pole switch. It physically consists of three layers of semiconductor (which ca...

Now we shall design a D-type based circuit that will count up or down, under the control of a single external input, through the first five prime numbers (in binary). We must ensure that the circuit w...

The general form of a synchronous sequential circuit is shown in Fig. 8.1. To recap, this has: external inputs, A, and outputs, Z; a combinational block can be considered in two parts; and 'memory’ in...

Synchronous binary counters are arguably the simplest sequential synchronous circuits. They use the flip-flops to store the circuit's count state and (usually) have no external inputs. Thus the next s...