74ABT646CMTC

Buffers, Drivers, Receivers, Transceivers Overview

The onsemi 74ABT646CMTC is an octal bus transceiver and register featuring 3-STATE outputs in a 24-lead TSSOP package. It operates within a supply voltage range of 4.5V to 5.5V, supporting TTL input and output levels. The device provides high drive capability with a low-level output current of 64 mA and a high-level output current of -32 mA. Propagation delays are specified at a maximum of 5.6 ns under standard conditions. It functions across an ambient temperature range of -40°C to +85°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Independent registers for A and B buses allow multiplexed real-time and stored data transmission.
• High impedance glitch-free bus loading during the entire power up and power down cycle ensures nondestructive hot insertion capability.
• Guaranteed latchup protection and simultaneous switching noise level specifications ensure dynamic threshold performance.

Buffers, Drivers, Receivers, Transceivers Applications

• Multiplexed transmission of data directly from input buses or internal registers
• Storage of data present at high impedance ports in either A or B registers
• Controlled transceiver function via OE and direction pins

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify component authenticity through official manufacturer channels or authorized distributors. Confirm RoHS compliance status and check for specific ordering suffixes if tape and reel packaging is required. Ensure the procurement source provides valid traceability documentation matching the original Fairchild Semiconductor or onsemi manufacturing records.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems requiring octal bidirectional data transfer with integrated storage capabilities. The ABT logic family supports high-speed operation suitable for complex digital interfaces. Verify that the application environment remains within the specified operating temperature and voltage limits to maintain guaranteed electrical characteristics.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the ABT logic series, characterized by BiCMOS technology for high-speed performance. Originally manufactured by Fairchild Semiconductor, production rights were transferred to onsemi. The CMTC designation specifically identifies the 24-lead Thin Shrink Small Outline Package variant compliant with JEDEC MO-153 standards.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Public confirmed substitute part numbers include SN74ABT646ADWR.

Buffers, Drivers, Receivers, Transceivers FAQ

How does the device handle data isolation?

In isolation mode, when the OE control is HIGH, data can be stored in the A or B register without affecting the opposite bus, allowing independent storage operations.

What determines the data direction?

The DIR (Direction Control) input determines which bus receives data when the enable control OE is active LOW, facilitating bidirectional transfer between the A and B buses.