MC74ACT640DW

Overview

The MC74ACT640DW is an octal buffer and line driver manufactured by onsemi, belonging to the ACT logic series. It features eight independent channels with inverted outputs and three-state control. The device operates within a supply voltage range of 4.5 V to 5.5 V. Key electrical parameters include a maximum propagation delay of 9 ns at a 50 pF load and output drive currents of ±24 mA. It supports TTL input levels and CMOS output levels. The component is housed in a 20-lead SOIC package and functions reliably across an operating temperature range from -40 °C to +85 °C.

Feature Summary

• Provides eight-bit data transmission capability with inverted logic functionality for signal buffering applications.
• Features three-state outputs that allow connection to shared bus structures without signal contention.
• Ensures compatibility with TTL input standards while delivering robust CMOS output drive characteristics.

Applications

• Clock drivers and buffer circuits in digital systems
• Memory address and data bus drivers
• Carry driving in high-speed counting applications

Procurement Notes

Verify the specific suffix against official datasheets to confirm package type and tape-and-reel specifications. Ensure the procurement source provides valid RoHS compliance documentation. Cross-reference the manufacturer part number with authorized distributor catalogs to avoid counterfeit components. Confirm that the delivered units match the exact MC74ACT640DW designation regarding pinout and electrical ratings.

Selection Notes

Select this component when designing systems requiring octal buffering with inversion and three-state isolation. It is suitable for interfaces between TTL and CMOS logic families. Consider the 9 ns propagation delay for timing constraints in medium-speed digital designs. Verify that the 20-pin SOIC package fits the available PCB footprint and thermal requirements.

Part Context

This part belongs to the 74ACT family of high-speed CMOS logic devices produced by onsemi. The ACT series offers performance comparable to low-power Schottky TTL but with lower power consumption. The MC74ACT640 specifically serves as an octal buffer, distinguishing it from other variants in the family that may offer non-inverted logic or different channel counts.

Replacement Considerations

Compatible substitutes include the MC74ACT640DWR2G, which shares identical logical and electrical specifications but utilizes a tape-and-reel packaging format instead of tube packaging. Both parts maintain the same 20-lead SOIC footprint and functional behavior.