ls20 includes two 4 input and not gates, including two sets of 4 and not gates. Among them, the first group: 5 input 6 output; Group 2:113 inputs and 8 outputs.
ls20 is a commonly used dual 4-input and non-gate integrated circuit, commonly used in various digital circuits and single-chip microcomputer systems, its logicThe function is to complete the logical and non-computational functions of the four inputs. The 74ls20 includes two 4 input and not gates, including two sets of 4 and not gates.
ls20 is with non-gate chip, 74ls00 is with 4 groups of 2 input and non-gate. Are used to implement the basic logic circuit, not this logic function. Non-gate circuit is the basic logic circuit of digital circuit. A superposition of gates and non-gates, with multiple inputs and one output. There are two requirements for non-computational inputs.
The second group: 9,10,12,13 connected to the circuit input, 8 connected to the circuit output. Feet 3 and 11 are empty feet,No wiring.
LS00 belongs to the TTL gate series. It is an internal and non-gate chip containing four double inputs, with 14 pins connected to 5v voltage and 7 pins. 74LS20 two 4 input and not gates, including two groups of 4 and not gates the first group: 1,2,4,5 input and 6 output.
Chip package Chip provides DIP1SOP16 two packages.
For the 51 single-chip microcomputer with DIP40 package, the power supply VCC pin is 40 pins, and the grounding GND pin is 20 pins. See the picture below. Related introduction: Pin, also called pipe pin, English called PIN. That is, from the internal circuit of the integrated circuit (chip) to the wiring of the peripheral circuit, all the pins constitute the interface of the chip.
The size and solder joints of the same package are the same, otherwise it is not called "the same package".
ULN2003An as has a dac. Because stc15w408as pin function diagram: stc15w series MCU, adc is composed of multiple selection switch, comparator, successive comparison register, 10-bit dac, etc., so stc15w408as has dac.
3. STC15W408AS has DAC function. According to the pin-function diagram of STC15W series microcontroller, ADC part is composed of multiple selector switch, comparator, successive comparison register and 10-bit DAC, so STC15W408AS contains DAC.
4,In the design of single-chip microcomputer system, the use of ADC keyboard instead of matrix keyboard has huge advantages, such as saving IO port is one of the obvious benefits. Therefore, the ADC keyboard driver has become one of the skills that beginners should learn and master.
Measure the battery capacity. According to the query, the 20cb chip pin is located at the motherboard, and its function is to measure the battery capacity and observe the battery discharge point, which is a common form of packaging.
footThe TPS562201 chip is an easy-to-use 2A synchronous buck converter in the SOT-23 package. It is optimized to operate with as few external components as possible and can achieve low standby current.
is used to connect and communicate with the rest of the circuit. Tolerance temperature: The tolerance temperature of the 20-pin chip of the rice cooker refers to the highest operating temperature that the chip can withstand. The tolerance temperature of the ordinary rice cooker chip is between 150-180 ° C, while the tolerance temperature of the high-end rice cooker chip can reach more than 200 ° C, which can adapt to the working requirements in a high temperature environment.