74ABT620D,623

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ABT620D,623 is an octal bidirectional bus transceiver manufactured by NXP USA Inc. It features inverting 3-State outputs and operates within a supply voltage range of 4.5 V to 5.5 V. The device supports asynchronous two-way communication between data buses with propagation delays as low as 1.0 ns at 5V. It provides high output drive capability of +64 mA/-32 mA and includes power-up 3-State functionality. The component is housed in a 20-pin plastic SO package (SOT163-1) and functions across a temperature range of -40°C to +85°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal bidirectional bus interface with dual enable inputs for flexible timing control
• Inverting 3-State buffers allowing effective bus isolation when disabled
• High output drive capability supporting heavy loads
• Power-up 3-State function ensuring safe initialization

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• Bus-oriented memory and command decoding applications
• Clock drivers and buffer circuits

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix matches the required package type, as the 74ABT620 series offers multiple packages including DIP, SO, SSOP, and TSSOP. Confirm that the 'D' suffix corresponds to the 20-pin Plastic SO package intended for surface mount assembly. Ensure compatibility with the target operating temperature range and voltage specifications before finalizing procurement.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component for designs requiring high-speed octal data transfer with inverting logic. The dual enable inputs provide independent control over data flow direction, offering greater flexibility than single-enable devices. Consider the high output current capability when driving long traces or multiple loads. Verify that the inverting nature aligns with the system logic requirements compared to non-inverting alternatives.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the 74ABT logic family, known for BiCMOS technology combining low power dissipation with high speed. The 74ABT620 is specifically designed as an octal transceiver, differing from simpler buffers or non-inverting variants like the 74ABT623. It shares functional similarities with other ABT transceivers but is distinct due to its inverting output characteristic and dual enable architecture.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Direct substitutes include other 74ABT620 variants with different packaging, such as 74ABT620N (DIP) or 74ABT620DB (SSOP), provided pin compatibility is verified. Non-inverting equivalents like the 74ABT623 may be used if logic inversion can be accommodated in the design. Cross-vendor compatible parts from manufacturers like Texas Instruments should match the ABT series specifications and package dimensions.

Buffers, Drivers, Receivers, Transceivers FAQ

What is the function of the OEAB and OEBA pins?

OEAB and OEBA are active-high and active-low output enable inputs, respectively. They control the direction of data flow from the A bus to the B bus or vice versa, allowing for flexible timing and bus isolation.

Does the device support live insertion and extraction?

Yes, the datasheet specifies that live insertion and extraction are permitted due to the 3-State output capability and internal protection features.

What is the maximum output current capability?

The device provides a low-level output current of +64 mA and a high-level output current of -32 mA, enabling it to drive heavy loads effectively.