SN74ALS640B-1NS

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS640B-1N is an octal bus transceiver with 3-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and supports a low-level output current (IOL) up to 48 mA for the -1 version. Propagation delays are specified between 2 ns and 15 ns depending on the signal path. The device functions over an operating temperature range of 0°C to 70°C and is housed in a standard plastic 20-pin DIP package.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Bidirectional data transmission between A and B buses controlled by direction input
• Inverting logic configuration for asynchronous two-way communication
• Output isolation capability via dedicated output-enable input

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• Bus-oriented memory and memory control circuits
• Signal buffering and driving applications

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify that the specific ordering suffix corresponds to the PDIP (N) package type, as other suffixes indicate different form factors such as SOIC or tape-and-reel configurations. Confirm the -1 designation is required if the application necessitates the increased 48 mA low-level output current specification. Ensure compatibility with the 0°C to 70°C commercial temperature range rather than the military grade variants.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when high-density bidirectional bus interfacing is required using ALS logic family characteristics. The -1 variant provides enhanced drive strength suitable for heavier loads compared to the standard version. Consider the 20-pin DIP footprint for through-hole mounting requirements. Evaluate propagation delay limits against system timing constraints before implementation.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN54ALS640B/SN74ALS640B series of octal bus transceivers. It shares functional similarities with the SN74AS640 but utilizes Advanced Low-power Schottky technology. The -1 suffix specifically denotes the version optimized for higher output current capabilities while maintaining the same logical operations and pinout structure as the base model.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74ALS640BN serves as the standard non-increased current alternative. SN74ALS640B-1DWR offers the same electrical specifications in a surface-mount SOIC package.