**Magnitude Comparator Circuit Diagram 11**

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Figure 211 shows the block diagram of a 4bit magnitude comparator. It has four lines for input A, four lines for input B, and three logic state output lines. The A > B output will go high if input A is larger than B; the A < B output will go high if input B is larger than A; and the A = B output will go high ifA is equal to B. A TTL 7485 magnitude comparator integrated circuit (IC) is shown in Figure 212(a). Its operation is identical to the block diagram circuit in Figure 211. It also has three inputs Digital. Magnitude. Comparator. The magnitude comparator is capable of comparing two binary numbers and indicating whether one number is greater than, less than, or equal to the other. Figure 211 shows the block diagram of a 4bit magnitude.comparator. It has four lines for input A, four lines for input B, and three logic state output lines. The A > B output will go high if input A is larger than B; the A < B output will go high if input B is larger than A; and the A = B output will go high if A Offers a fresh, uptodate approach to digital design, whereas most literature available is sorely outdated Progresses though low levels of design, making a clear distinction between design and gatelevel minimization Addresses the various Date input 53 1 16 VCC A<B 2 15 A3\ C3553'? =5 3 14 82 A>B 13 A2 A>B 5 7485 12 A1 >Data outputs Outputs A=B 6 11 B1 A<B 7 10 A0 GND 8 9 BO / JIM'. Pinout diagram of the 7485 magnitude comparator IC. +5vdc O 16.VCC DD 15 CD—13 % gfiiFiti A decoder BD—12 A>B Al: 10 Set switch I —i:> To _D control —r:> A=B circuit e 14 A<B l I l l :11 l I l 1 ND 006) The basic wiring diagram of a singlestate magnitude comparator circuit. recording purposes. Using a disc with 25 slots Ideally, when multiple outputs are being produced by a circuit, they should all be available at approximately the same time (which is the advantage of the two subtracter circuit shown in Fig. 511. In this diagram, I have shown how two four bit magnitude comparators can be “ganged” together to provide a comparison function on eight bits. The least significant four hits are passed to the first magnitude comparator and the most significant four hits are passed.to the second magnitude There is a carry input at pin 13 labeled Co and a carry output at pin 14 labeled C4. When the 7483 is used only with 4bit numbers, the Co input should be grounded. For numbers larger than 4bits the Co and C4 connections are used to connect the adders together similar to that shown in Figure 65. The 7483 is implemented to serve as a dual singlebit full adder as shown in Figure 6 10c. The upper half will be used to test the serial addition operation of Figure 611. Two 7495 shift 10 Circuit diagram and observed inputoutput waveforms of the magnitude comparator with digitizer. A NEW SOI DEVICE DELTA Structure and Characteristics Eiji TAKEDAt,. 4th floor O / E conversion ". 420 pixels / character SOI.photodiode a block for a character 3rd floor s digitize majority decision SOICMOS 2nd floor data hold data mask SOICMOS a character recognition chip ** 1st floor ' associative ROM comparison bulk Si NMOS 357 magnitude CQomparator ask register The block diagram for the I/O circuit is shown in Figure 115. The Output Port Let us now discuss the output port hardware for the I/O circuit. The schematic for the output port is shown in Figure 116. We will describe exactly how each section of Figure 1 16 operates to accept data output from the TRS80. To start, let us discuss the function of the two 74LS85 4bit magnitude comparators. These are labeled as IC1 and IC5 in the schematic. IC1 and IC5 are connected to form an 8bit In this.latest edition, virtually all chapters have been rewritten, the transistor model equations and device parameters have been revised to reflect the sigificant changes that must be taken into account for new technology generations,