1, this is two different 74153 is what chip chip 74153 is what chip , the former is double 4 choose 1 data selector 74153 is what chip , The latter is an 8-1 data selector. The function and usage of the two are very different.
2, the secret in the logic symbol 74153 logical symbol shows what chip 74153 is its unique structure, the MUX at the top identifies what chip 74153 is what data selector identity, The common controller box at the top indicates that addresses A0 and A1 share control, while the four inputs of each cell are affected by enabling the gated control EN. When EN is low, the data selector works, otherwise the output remains 0.
3, this is quite simple, first put two pieces of 1A pair of 6 control ends of 53 should be connected together to form 3 new control ends B, C, D, and A control end A (high), the first piece of 153 enable end (low level effective) connected to A, the second piece 153 enable end through a non-gate connected to A, two outputs (high level effective) through one or a gate connected together to form a new output.
4, the selector is used to select the signal, the role is that when the input signal, only one of the output is selected, the selection is based on the signal of its address line, the address line has N, you can make 2^N select a selector.
According to the 74153 function table (see the attached figure), it can be found that 74153 is what chip , the 153 chip has only two communication number input 74153 is what chip , that is, A0 and A1, and there are three input variables. So how to choose the input position of the remaining input variable is to solve thisThe key to the question. Analysis of the function table shows that if the third signal is enabled as the chip, the expected effect cannot be achieved, then only the last signal is connected to the data input channel of 153.
Asked with 74160 and 74153 to achieve 26 and 46 base counters, if you guessed correctly, it is you. In fact, 23 and 26, just one line difference, 26 base Q2Q1, 23 base Q1Q0. And 43 and 46 are just one line apart, 43 is connected to Q1Q0, 46 is connected to Q2Q1. The other circuits are completely unchanged.
is decimalCounters, to form base 26 and base 46 counters, must use two or two. First, use the clean 0 method to change the base 26 and base 46 respectively, the binary number of 26 is 0010 0110, and the state of 46 is 0100 0110. When there are exactly 3 bits of 1, two 3 inputs and non-gate 74LS10 are used to produce a clear 0 signal. Two clear 0 signals can be selected with 74LS153. The logic diagram is as follows.
or widen the gate signal. Because the frequency doubling circuit is more complex, the latter method is generally used, in fact, the gate signal broadening and the frequency doubling of the measured signal are in effectThe same. Gate signal broadening is relatively easy to achieve, for example, by using a frequency division circuit. If the gate signal high level time is widened from 1 second to 10 seconds, the relative error can be reduced proportionally, but the response time also increases by the same proportion.
Note 74153 is what chip : The same type of 74 series, 74HC series, 74LS series chip, logic function is the same. 74LSxx instructions If you cannot find them, refer to the instructions for 74xx or 74HCxx. Some sources contain 2, this series of chips is the United States radio RCA company. American radio RCA company is the world's first commercial CMOS integrated circuit, the products are mainly CD40 and CD45 serial number, in the long history of digital logic circuit chips technology and product development, CD4000 series and 74 series is still the most used logic IC, the most widely used two majorThe product line. 3, the measurement of TDA2030A in the road voltage method is as follows: The problem is to measure whether the TDA2030A chip each pin to ground voltage is normal after the power amplifier is turned on, if there is an anomaly, check the components around the chip abnormal foot. If the components around the abnormal foot of the above measurement chip are normal, then the fault is likely to be the chip damage. 4. Like Moore's Law, which holds that the number of transistors on a chip doubles every 18 to 20 months, Metcalfe's law is an empirical approximation rather than an eternal law of physics. Gilder claims that this law played an important role in the later formation of the "new economy". Not long after that, Internet companies like Reed E. Omit, EToy and Excite@Home, then chairman of the Federal Communications Commission. 5, and in the United States, the leaders of some production departments of RCA companies on the one hand are limited to traditional semiconductor products, on the other hand, they overemphasize the shortcomings of fledgling liquid crystal display devices, and try to destroy the industrialization of liquid crystal display under the pretext that the market has not yet been developed. To this end, LCD team members began to outflow, LCDThe patent was also sold. 6, because the current flash work is relatively simple. So many parallel products or fake products. In the computer city it is very common to see shop assistants in their own gold XX brand shell. When purchasing, it is best to test the real machine and copy the file with its own capacity size or run V3 software. If the flash drive can run the software, it's real. MyDiskTest is the first true U disk expansion detection tool. LS is a low-power Schottky, an improved version of the Advanced low-power Schottky TTL, or 74ALS series, which performs better than the 74LS. HC is a high-speed COMS, which has the low power consumption of CMOS and the performance equivalent to 74LS high speed, and belongs to a high-speed and low power product. LS is slightly faster than HC. HCT input and output are compatible with LS, but the power consumption is low. F is for high-speed Schottky circuit; LS is the TTL level and HC is the COMS level. The difference between f191 and 74ls191 is that there is a difference in performance, speed and power consumptionSome differences. 74LS191 is a low-power S-TTL series of hexadecimal synchronous rise counter, it uses a negative structure, has a good anti-interference ability at low speed, and 74F191 is a high-speed F-series of hexadecimal synchronous rise/fall controllable counter, it uses a positive structure, has a good performance at high speed. But the power consumption will be higher than 74LS191. F14 Power supply operating voltage 5V ~ 5V. 74LS14 Power supply operating voltage 5V. Different power consumption: LS is low power Schottky; LS is slightly faster than HC; HC is a high speed COMS. HCT input and output are compatible with LS, but the power consumption is low. F is for high-speed Schottky circuit; Different levels: LS is TTL level; HC is the COMS level. The operating voltage is different: LS can only use 5V; And HC is generally 2V to 6V; CMOS devices have poor antistatic ability and are prone to latch problems, so CMOS input pins cannot be directly connected to the power supply. . Different power consumption: LS is low power Schottky; LS is slightly faster than HC; HC is high speed communication. HCT input and output compatible with LS, but low power consumption; F is a high-speed Schottky circuit; CMOS circuit, the CMOS circuit series produced in China is "CC4000B". 2. Different levels: LS is TTL level; HC is the COMS level. Category: Education/Science Science Technology Engineering Technology Science Analysis: CMOS and CHMOS and TTL circuit characteristics: CMOS logic circuit - (complementary metal - oxide - semiconductor) 4000 and 74C series. TTL logic circuit -- (transistor -- transistor) 74 series TTL medium speed devices; 74S series is TTL high speed Schottky series; 54 seriesTo be classified as military goods; 74LS Low power consumption; The 74F series is a high-speed model. What is the difference between 74f and 74ls series chips?
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