SN74128D

SN74128D is a dual high-speed Schottky TTL logic buffer that provides increased switching speed for buffering data and address buses in medium-speed memory, control and logic applications. SN74128D is designed to accept standard TTL input levels from -0.1V to 0.3V and utilizes a Schottky TTL design to minimize turn-on and turn-off switching time. The device is also available in standard TTL packaging and with Schottky barrier diodes (SD) to reduce ground bounce noise and switching time.

SN74128D components are often used in logic circuit applications such as address and data communications, data storage, and digital logic applications. This device can be used as an address buffer to route digital signals to address decoding logic, as a data register to store data, and as a register in CPU architectures. Alternatively, SN74128D can also be used as an inverter, in which one signal is converted to its inverted output, such as a open-drain Schottky output.

The SN74128D employs Schottky diode logic to interface between inputs and outputs, which allows for increased speed when buffering data and address buses. This Schottky logic works as follows: when an active logic-high level (logic 1) is applied to the input, the voltage is compared to a fixed reference voltage (Vh), which is typically around 0.8V. If the voltage is greater than Vh, the SN74128D will produce a high-speed transition to the output (logic 1). Similarly, when an active logic-low level (logic 0) is applied to the input, the voltage is compared to a second reference voltage (Vl), which is typically near ground level (0.0V). If the voltage is lower than Vl, the SN74128D will produce a high-speed transition to the output (logic 0).

The SN74128D is also able to provide a path from the input to the output that is automatically biased to the proper transition levels, allowing for a shorter transition time than with other methods of buffering data. This provides quick propagation delays and improved switching times, resulting in reduced power consumption. Furthermore, the device is equipped with Schottky barrier diodes (SD) to reduce ground bounce noise and switching time.

SN74128D is available in different packages, including SOIC-14 (small outline integrated circuit), SSOP-14 (shrink small outline package), SOP-14 (small outline package), and QFP-14 (quad flat package). These packages all offer the same functionality, but differ in size, so the proper package should be selected based on the requirements of the application.

In summary, SN74128D is dual high-speed Schottky TTL logic buffer that is designed to accept standard TTL input levels from -0.1V to 0.3V and utilizes a Schottky TTL design to minimize turn-on and turn-off switching time. SN74128D can be used to buffer data and address buses, as an address buffer, as a data register, in CPU architectures, or as an inverter. This device is available in various packages and is equipped with Schottky barrier diodes (SD) to reduce ground bounce noise and switching time.