M74HCT244B1R

M74HCT244B1R is a high-performance general-purpose octal buffer/driver designed for the structures where relatively low output drive and very high speeds are required. It is typically used to drive inverting logic, such as TTL and CMOS, in high voltage applications. It is ideal for applications such as data bus, address bus, control bus and power bus driving. This device is composed of one 8-bit non-inverting buffer and one 8-bit inverting buffer. It is approved and compatible with all leading industry standard logic. The device provides very low output and input leakage current, excellent speed and reliable performance.

Application Field

The M74HCT244B1R has outstanding features and is suitable for applications in almost any high-speed interface circuit. It is used in a wide range of different applications, such as computers, automotive, telecommunications, industrial and military. It is used to drive buffered or unbuffered address, data and control buses, as well as various other digital circuits on the processor boards and hosted systems that require large capacitive loads and high speed. It is also used for driving prominent bus lines.

Working Principle

The M74HCT244B1R functions are logically separated into two parts. The first part concentrates on non-inverting Buffers and the second part concentrates on inverting Buffers. The buffers perform two basic functions, buffering and driving, depending on the load capacitance and the distance the load is connected to the output of the buffer. The function of buffering is to isolate the device driving the buffer circuit from the load, preventing a loading effect on the driver. The function of driving is mainly to increase the current limiter capability of the driver in order to reduce the voltage drop over the input of the device.

Non-inverting buffers have a higher capability for driving low-level current than inverting buffers. The non-inverting buffer is used to amplify the input signal, providing higher current-drive capability. The output is the same state as the input. Inverting buffers are used for data conversion between TTL and CMOS. This type of buffer has the logic inversion of the output with respect to the input, and the output is complementary to the input. The inputs and outputs of the M74HCT244B1R are ESD protected.

Furthermore, the device is designed to tolerate a certain level of transient voltage and current dips on the input side and will protect the device from over-currents. The logic thresholds of M74HCT244B1R are designed to be compatible with the previous logic family spikes. The device is provided with an internal feedback circuit which allows extremely tight timing performance, adequate noise immunity, and stable operation in noisy environments.