74AC646SPC

Buffers, Drivers, Receivers, Transceivers Overview

The onsemi 74AC646SPC is an octal bus transceiver and register with 3-state outputs, housed in a 24-lead Plastic Dual-In-Line (PDIP) package. It operates within a supply voltage range of 2V to 6V and supports a temperature range of -40°C to +85°C. The device features independent registers for A and B buses, allowing multiplexed real-time and stored data transfers. Outputs can source or sink up to 24mA. Data loading occurs on the LOW-to-HIGH transition of clock pins CPAB or CPBA.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Independent registers for A and B buses
• Multiplexed real-time and stored data transfers
• 3-STATE outputs

Buffers, Drivers, Receivers, Transceivers Applications

• Bus transceivers
• Octal Trans and Reg
• Logic ICs

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status as indicated in official documentation. Check for obsolete status notifications from onsemi. Ensure the specific PDIP package variant matches design requirements. Validate datasheet revisions against current manufacturing standards.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring octal bidirectional data transfer with storage capabilities. Consider the 2V to 6V operating range for compatibility with various logic families. Evaluate the 24-PDIP package for through-hole mounting needs. Assess propagation delays and drive currents against system timing requirements.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the 74AC series of high-speed CMOS logic devices. It is manufactured by onsemi, formerly Fairchild Semiconductor. The device is functionally similar to the 74ACT646 but differs in input threshold voltages and operating voltage ranges. The AC series offers faster switching speeds compared to standard HC or HCT logic families.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

74AC646SC

Buffers, Drivers, Receivers, Transceivers FAQ

What is the function of the DIR input?

The DIR input controls the direction of data transfer between the A and B buses.

How is data loaded into the internal registers?

Data is loaded into the respective registers on the LOW-to-HIGH transition of the appropriate clock pin (CPAB or CPBA).