This applet shows the internal gatelevel circuit used in the ttlseries 7485 4bit magnitude comparator ics. This ic can be used to compare two 4bit binary words by grounding i ab, i a ic7485 comparator. Photograph features compares 4bit binary or bcd codes and outputs greater, less than or equal. This is a sn7485n ttl integrated circuit 4 bit magnitude comparator. Ti, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors.
If we want 5 bit magnitude comparator then we have to adjust one input line. For more bit comparison, more than one such ics can be cascaded. A comparator used to compare two binary numbers each of four bits is called a 4 bit magnitude comparator. Data comparators are useful digital components that compare the value of multiple signals. Digital comparator and magnitude comparator electronics hub. The sn54 74ls85 is a 4bit magnitude camparator which compares two 4bit words a, b, each word having four parallel inputs a 0 a3, b 0 b3. Every 7485 ic has three cascading input lines which can used in this case because we are using only one ic to make. It takes two nos in 4bit binary format and compares the nos as to if they are equal or which one is greater.
Magnitude comparator a magnitude comparator is a digital comparator which has three output terminals, one each for equality, a b greater than, a b and less than a comparator is to compare a set of variables or unknown numbers, for example a a1, a2, a3. Mm74c85 4bit magnitude comparator mm74c85 4bit magnitude comparator general description the mm74c85 is a fourbit magnitude comparator which will perform comparison of straight binary or bcd codes. It has three cascade inputs abin, a comparator compare two 4bit binary number. Manufacturer and dealer, distributor and retailer for various. A common comparator is the ic 7485 chip which compares two 4bit binary numbers. The circuit for a 4bit comparator will get slightly more complex. Comparators are used in central processing unit s cpus and microcontrollers mcus. Digital comparator and magnitude comparator tutorial. As for the last line of the truth table, the outputs indicate that the a inputs are simultaneously greater and less than the b. Ic 74ls85 4bit magnitude comparator jameco electronics. Magnitude comparator in digital logic geeksforgeeks. These fourbit magnitude comparators perform comparison of straight binary and straight bcd 8421 codes.
These devices are fully expandable to any number of bits without external gates. Can you use ic 7485 which is a comparator as subtractor. These 4bit magnitude comparators perform comparison of straight binary or. In a 4bit comparator the condition of ab can be possible in the following four cases. The basic function of the comparator is to compare the two input bits and then give the three outputs. Data comparison can be performed by grounding ab, a integrated circuit performs a cascading operation where it helps for cascading multiple comparators. A comparator produces three outputs as l, e and g which corresponds to less than, equal and greater than results. Examples of digital comparator include the cmos 4063 and 4585 and the ttl 7485 and 74682. They perform comparison of two 4bit binary, bcd or other monotonic codes and present the three possible magnitude results at the outputs qab, qab and qa comparator dm74ls85 4bit magnitude comparator general description these 4bit magnitude comparators perform comparison of straight binary or bcd codes.
A digital comparator s purpose is to compare numbers and represent their relationship with each other. These are available in ttl as well as cmos logic family ics and some of these ics include ic 7485 4bit. All for sale chips are completely new and never used. The two 4bit numbers are input to the ic through a dc supply via 8 position dip switch. The circuit consists of eight comparing inputs a0, a1, a2, a3, b0, b1, b2, b3, three cascading inputs a b, a 7485 74ls85 4bit magnitude comparator in india at low price from dna technology.
These 4bit magnitude comparators perform comparison of straight binary or bcd codes three fullydecoded decisions about two 4bit words a b are made. The cascading inputs come from the outputs of another 7485. Due to covid19 situation shipping and delivery services will be affected. Tlf6379june 198954ls85dm54ls85dm74ls854bit magnitude comparatorsgeneral descriptionthese 4bit magnitude comparators perform comparison ofstraight binary or bcd codes three fullydecoded decisionsabout two 4bit words a b are made and are externallyavailable at three outputs these devices are fully expandable to any number of bits without external gates words of datasheet search. The7485 is a 4bit magnitude comparator that can be expanded to almost any length. The ic is a 4bit magnitude comparator which can be used for comparison of straight binary numbers and bcd coded numbers. A digital comparator or magnitude comparator is a hardware electronic device that takes two numbers as input in binary form and determines whether one number is greater than, less than or equal to the other number. To study and simulate design of 4bit comparator ic 7485 using vhdl.
It is possible to cascade mode than one ic 7485 to compare words of almost any length by making use of the cascade pins of the ic. In electronics devices besides addition and subtraction comparison of binary numbers is also important to perform the operations. In the first level of logic, using the nand and andorinvert gates, the corresponding bits of the a and b inputs are compared. The 16pin ic has the following pin configuration fig. In order to compare two 10bit words, we will require to cascade three ic 7485s. If you wish to create a 16 bit magnitude comparator, the other 7485 connects to the least significant byte lsb. It consists of eight inputs each for two four bit numbers. The 4bit comparator is mostly available in ic form and common type of this ic is 7485. More than one comparator can also be connected in cascade arrangement to perform comparison of numbers of longer lengths. Nsc, alldatasheet, datasheet, datasheet search site for electronic components and. To receive a combined shipment discount, please wait for the discounted invoice before making a payment. The least significant or only comparator in a chain should have i a b tied low and i ab tied high. More items like this one can be found in our store.
Spice simulation of a 8 bit comparator implemented with two 4 bit comparator 7485. In this project sn7485 ic is used which is a 4bit magnitude comparator. In this post, we will make different types of comparators using digital logic gates. These are also available in ic form with different bit comparing configurations such as 4bit, 8bit, etc. What is the purpose of the cascading inputs of ic 7485. There are also discrete ics available for comparison of binary numbers. Mostly, 4bit comparators are in the form of ic s and the ic 7485 is widely used. We are available on email only for all your queries. We will begin by designing a simple 1bit and 2bit comparators. The sn5474ls85 is a 4bit magnitude camparator which compares two. Comparator designing 1bit, 2bit and 4bit comparators. The integrated circuit ic available for 4 bit digital comparator is ic 7485.
Sn7485n ttl ic 4 bit magnitude comparator dip16 ebay. Three fully decoded decisions are externally available at three outputs. It consists of eight inputs each for two four bit numbers and three outputs to generate less than, equal to and greater than between two binary numbers. Whenever we want to compare the two binary numbers, first we have to compare the most significant bits. This ic has three terminals, labeled as a b in, a b in and a b in and other three terminals labeled as, as a b out, a b out and a b out.
Three fullydecoded decisions about two, 4bit words a, b are made and are externally available at three outputs. Absolute maximum ratings noteif militaryaerospace specified devices are requiredplease contact the national semiconductor salesofficedistributors for availability and specificationssupply voltage7vinput voltage7voperating free air temperature rangedm54ls and 54ls datasheet search, datasheets, datasheet search site for electronic components and semiconductors, integrated circuits, diodes and. A comparator used to compare two binary numbers each of four bits is called a 4bit magnitude comparator. How to design a 5bit magnitude comparator using a single. To compare more than 4 bits, connect the outputs to the expansion inputs of the next significant comparator. Dm74ls85 4bit magnitude comparator dm74ls85 4bit magnitude comparator general description these 4bit magnitude comparators perform comparison of straight binary or bcd codes. Nsc 4bit magnitude comparators,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. Ic 7485 comparators are simple yet efficient chips that use basic logic to com. When youre cascading multiple devices, and the inputs are identical, the result depends on the other devices processing the least significant bits. How to work with magnitude comparator using 7485 ic duration. This ic can be used to compare two 4bit binary words by grounding i ab, i a comparator. Operation is not restricted to binary codes, the device will work with any monotonic code. For comparison of 4bit numbers, sn7485 ic is used in this project. U3550bm u3550bm 2650mhz d74025 15sep97 microprocessor 8952 7808 ct ic 7485 4 bit comparator ic 7485 comparator function table 8952 microcontroller datasheet microprocessor 8952 temic 4714 power amplifier 6012 comparator ic 7485.