74HC244 is a common driver signal chip, commonly used in various single-chip mcu systems. The output of the IO port of the MCU is very small and the 244 chip is used to amplify the current. It is an eight-way buffer and line driver with three-state output. The only difference between him and the 74HC245 is that the 74HC244 is unidirectional, data can only flow from the A end to the Y end, while the 74HC245 is bidirectional. Their driving ability is the same. 74hc244 pdf information
74HC244 is also often used for isolation. For example, direct connection of single-chip microcomputer and parallel port can directly connect the parallel port with several I/O ports of the single-chip microcomputer. However, if the circuit board is not well, it may burn the computer parallel port, so To add a 74HC244 chip to isolate
74HC244 is a CMOS circuit, 74ls244 is a bipolar transistor type circuit, the characteristics of the two are very different, LS devices are eliminated, try not to use.
74HC240, 74HC241, 74HC244 are the same series of products, their difference is very small in the pin and its function. The following Chinese materials have detailed description.
74hc244 physical map
74hc244 pin diagram
The following describes the functions of the 74hc244:
There are two four-bit three-state buffers inside the 74HC244 chip, which can be used as their strobe working signals with 1C and 2G respectively. When both 1C and 2G are low, the output Y and the input A have the same state; when both 1G and 2G are high, the output is in a high impedance state.
Eight-phase three-state buffer/line driver
74HC233 chip function
If the input data can be kept for a relatively long time (such as a keyboard), the typical chip commonly used for simple input interface expansion is the 74HC244, which can form a three-state data buffer. The pin layout of the 74HC244 chip is shown in Figure 1.
There are two four-bit three-state buffers inside the 74HC244 chip, which use 1C and 2G as their strobe operation signals respectively. When both 1/0E and 2/0E are low, the output terminal Y and the input terminal A have the same state; when both 1/0E and 2/0E are high, the output is in a high impedance state.
74hc244 pin diagram of dip package
Patch 74hc244 pin diagram
74hc244 package drawing
74hc244 truth table
74hc244 and 74hc241 74hc240 function table
Buffered parallel port circuit
74hc244 application circuit
74hc244 current maximum
74hc244 voltage temperature and other operating conditions
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