74HC240D,653

Overview

The Nexperia 74HC240D,653 is an octal buffer and line driver featuring inverting 3-state outputs. It operates within a supply voltage range of 2.0 V to 6.0 V and utilizes CMOS technology for low power dissipation. The device includes two output enable inputs (1OE and 2OE), each controlling four outputs. Propagation delay ranges from 9 ns to 30 ns depending on the supply voltage. High noise immunity and ESD protection are provided, with latch-up performance exceeding 100 mA per JESD 78 Class II Level B.

Feature Summary

• Features inverting 3-state outputs controlled by two independent output enable inputs.
• Provides high noise immunity and robust latch-up performance exceeding 100 mA.
• Includes input clamp diodes allowing interface to voltages exceeding VCC using current limiting resistors.

Applications

• Bus-oriented systems requiring signal buffering
• Clock drivers for high-speed digital circuits
• Memory module address and data bus driving

Procurement Notes

Verify the specific package variant against the required footprint, as the 74HC240 family supports multiple packages including SO20, TSSOP20, and DHVQFN20. Confirm that the operating temperature range meets the application requirements, as the datasheet specifies operation from -40 °C to +125 °C. Ensure design safeguards account for the absolute maximum ratings to prevent permanent damage.

Selection Notes

Select this component when an octal inverting buffer with 3-state capability is required. The wide supply voltage range allows compatibility with various logic families. Verify that the load capacitance and transition times align with the system's timing constraints. Consider the thermal derating characteristics if operating at elevated ambient temperatures or under high power dissipation conditions.

Part Context

This part belongs to the 74HC series of high-speed CMOS logic devices manufactured by Nexperia. The 74HC240 specifically functions as an octal buffer/line driver. It is designed for applications requiring high fan-out and signal integrity across a broad voltage spectrum. The device is compliant with JEDEC standards for both 2.7 V to 3.6 V and 2.0 V to 6.0 V operation.

Replacement Considerations

The 74HCT240D serves as a compatible alternative within the same family, offering TTL-compatible input levels while maintaining the same pinout and functionality. Designers should verify input voltage thresholds when substituting between HC and HCT variants to ensure proper logic level interfacing.