74ABT646CMSA

Buffers, Drivers, Receivers, Transceivers Overview

The onsemi 74ABT646CMSA is an octal bus transceiver and register featuring 3-state outputs in a 24-lead SSOP package. It operates within a supply voltage range of 4.5V to 5.5V, supporting a maximum clock frequency of 200 MHz. The device provides independent registers for A and B buses with multiplexed real-time and stored data transfer capabilities. Key electrical parameters include a propagation delay of up to 5.6 ns at 50 pF load, output sink capability of 64 mA, and source capability of 32 mA.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Multiplexed transmission of data directly from the input bus or internal storage registers
• Independent registers for A and B buses allowing flexible data handling
• High impedance glitch-free bus loading during power-up and power-down cycles
• Nondestructive hot insertion capability

Buffers, Drivers, Receivers, Transceivers Applications

• Bus transceiver circuits requiring multiplexed data transmission
• Systems utilizing D-type flip-flops for data storage and transfer
• Applications demanding high impedance isolation during power transitions

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering code suffix 'MSA' corresponds to the 24-lead Shrink Small Outline Package (SSOP) as defined in the datasheet. Confirm that the component meets the required operating temperature range of -40°C to +85°C. Ensure compatibility with the specified 4.5V to 5.5V supply voltage conditions before integration into the design.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an octal transceiver with integrated storage registers is required. The SSOP package offers a compact footprint suitable for space-constrained designs. Verify that the 64 mA sink and 32 mA source drive currents meet the load requirements. Consider the 200 MHz maximum clock frequency for high-speed signal integrity needs.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the ABT logic family, characterized by BiCMOS technology for high speed and low power consumption. It functions as an octal transceiver/register with 3-state outputs, enabling bidirectional data flow controlled by direction and enable signals. The non-inverting configuration ensures data polarity preservation across the bus interface.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Check for equivalent octal transceivers with similar pinouts and electrical characteristics. Verify package compatibility and ensure the replacement supports the required 4.5V to 5.5V operating voltage and 200 MHz clock frequency.

Buffers, Drivers, Receivers, Transceivers FAQ

How does the device handle data transfer between buses?

Data can be transferred in real-time (transparent mode) or stored in the internal registers before being output, controlled by select inputs.

What is the behavior of the outputs during power-up and power-down?

The outputs maintain a high impedance state, providing glitch-free bus loading throughout the entire power cycle.