The HD74LS38FPEL is a Quad 2-Input NAND Buffer with Open Collector Outputs, manufactured by Renesas Electronics America. It is part of the 74LS series of TTL (Transistor-Transistor Logic) devices, which provide a balance between speed and power consumption. This integrated circuit features four independent 2-input NAND gates, each with an open-collector output. Open-collector outputs require an external pull-up resistor to define the high logic level.

Applications

• Wired-AND Logic: The open-collector outputs allow for implementing wired-AND logic functions.
• Bus Interface: Used for driving common buses where multiple devices share the same line.
• Lamp Drivers: Can be used as drivers for low-current lamps or LEDs.
• Relay Drivers: Can drive small relays with the addition of a suitable external pull-up resistor.
• Level Shifting: Used for interfacing between different voltage levels with appropriate pull-up resistor selection.

Features

• Quad 2-Input NAND Gates: Contains four independent NAND gates in a single package.
• Open-Collector Outputs: Requires external pull-up resistors for proper operation.
• High Sink Current Capability: Able to sink a relatively high current at the output.
• TTL Compatible: Compatible with other TTL and CMOS logic devices.
• Low Power Consumption: Operates with a relatively low power consumption compared to standard TTL devices.

Benefits

• Wired-AND Implementation: Simplifies the implementation of wired-AND logic functions.
• Bus Driving Capability: Suitable for driving multiple devices on a common bus.
• Versatile Output Configuration: Open-collector outputs offer flexibility in circuit design.
• Reduced Component Count: Integrates four NAND gates into a single IC, saving board space.
• Easy Integration: TTL compatibility simplifies integration into existing digital systems.

Additional Details

The HD74LS38FPEL operates from a 5V power supply. The typical propagation delay is around 15ns. The operating temperature range is typically 0°C to 70°C. It is commonly available in a 14-pin package. The FPEL suffix likely refers to a specific surface-mount package type.