74HC244N,652

Overview

The NXP USA Inc. 74HC244N,652 is an octal buffer and line driver featuring three-state outputs, manufactured by Nexperia under the NXP brand. It provides two independent four-bit buffers or a single eight-bit buffer configuration. The device operates with a supply voltage range of 2.0 V to 6.0 V for the HC variant. It includes input clamp diodes for interfacing with voltages exceeding VCC. The component utilizes a 20-pin PDIP package (SOT146-1) and supports operating temperatures from -40 °C to +125 °C.

Feature Summary

• Features non-inverting three-state outputs controlled by separate output enable inputs.
• Includes input clamp diodes allowing interface to voltages higher than the supply voltage using current limiting resistors.
• Offers high noise immunity and low power CMOS dissipation characteristics.
• Complies with JEDEC standards JESD8C and JESD7A for specified voltage ranges.

Applications

• Octal bus interface systems
• Line driving applications
• Buffering digital signals in microcontroller circuits

Procurement Notes

Verify the specific ordering suffix '652' against the manufacturer's current catalog to confirm the exact package type and temperature grade. Ensure the procurement documentation matches the required logic family specifications. Confirm that the delivered components align with the stated JEDEC compliance levels and ESD protection ratings defined in the product data sheet.

Selection Notes

Select this component when an octal buffer with three-state capability is required for bus interfacing. The wide supply voltage range allows flexibility in system design. Consider the input clamp diode feature if interfacing with external voltages exceeding the internal supply rail. Verify thermal requirements against the specified ambient temperature range for the intended application environment.

Part Context

This part belongs to the 74HC/HCT series of high-speed silicon-gate CMOS devices. It is pin-compatible with low-power Schottky TTL (LSTTL) logic families. The series is designed to meet JEDEC standard no. 7A specifications. The device functions as a medium-scale integration (MSI) logic circuit suitable for general-purpose buffering and line driving tasks in digital electronics.

Replacement Considerations

Direct replacements include the 74HCT244 variants for TTL-level input compatibility. Other octal three-state buffers within the same logic family may serve as alternatives if pin configurations match. Verify electrical characteristics such as propagation delay and output drive strength before substituting.