74HCLSHCTF系列芯片的区别（国外英文资料）.docVIP

74HCLSHCTF系列芯片的区别（国外英文资料） The difference between 74HC/LS/HCT/F series chips 1, LS is low-power schottky, and HC is high-speed COMS. LS is slightly faster than HC. HCT input/output is compatible with LS, but low power consumption; F is a high-speed schottky circuit; 2, LS is TTL level, HC is COMS level. 3, the LS input is high level, HC input is not allowed to open, and HC is generally required to have up and down resistance to determine the level when the input end is invalid. LS doesnt have that requirement 4, the LS output is pulled down to pull down, and HC pulls down the same. The working voltage is different, the LS can only use 5V, and HC is 2V to 6V. 6, the level is different. LS is TTL level, low level and high level of 0.8 and V2.4, while CMOS has a working voltage of 0.3 V and 3.6 V respectively, so CMOS can drive TTL, But the reverse is not good The driver ability is different, the driver capacity of the ls-general is 5mA, and the lower level is 20mA. CMOS, on average, is 5mA. The CMOS device has a low resistance to static electricity and can easily latch problem, so the input of CMOS cant be connected directly to the power source. The 74 series integrated circuits are broadly grouped into six categories: 74 times (standard); 74LS x (low-power schottky); 74S (schottky); 74ALS (advanced low-power schottky); 74AS (advanced schottky); 74F times x. In recent years, there have been 74 series of high-speed CMOS circuits, which fall into three categories: HC works for COMS; HCT works for TTL, which can be used in a series of 74LS. HCU is suitable for non-buffered CMOS circuits. These nine 74 series of products, as long as they are the same number in the back, have the same logic and the arrangement of the pins. According to different conditions and requirements, different types of 74 series products, such as circuits, may be selected The power supply voltage of 3V should choose the product of 74HC series 7400 QUAD 2-input NAND GATES and non-gates 7401 QUAD 2-inp