74LS640FP-E

Overview

The HD74LS640FP-E is an octal bus transceiver from the LS series, manufactured by Renesas Electronics Corporation. It features eight bidirectional data paths with inverted outputs and three-state logic in a 20-pin SOP package. The device supports asynchronous two-way communication between data buses, controlled by direction and enable inputs. It operates within a temperature range of -20 °C to +75 °C.

Feature Summary

• Provides octal (8-bit) bidirectional data transmission capability
• Features inverted output polarity for signal inversion during transfer
• Includes common output enable and direction control inputs
• Utilizes three-state outputs to isolate buses when disabled

Applications

• Asynchronous two-way communication between data buses
• General-purpose logic IC applications requiring bus isolation
• System control circuits utilizing standard TTL-compatible logic levels

Procurement Notes

Verify the exact part number suffix against official Renesas documentation, as variations such as FP-EL or FPEL may exist. Confirm RoHS compliance status and lead time directly with authorized distributors or the manufacturer, as availability for legacy LS series components can vary significantly across regions and supply channels.

Selection Notes

Select this component for designs requiring standard LS-series performance with inverted outputs. Ensure the application voltage and load capacitance requirements align with the LS family specifications. Consider thermal management within the specified operating temperature range if high switching frequencies are anticipated in the target system design.

Part Context

This component belongs to the HD74LS series of general-purpose logic integrated circuits produced by Renesas. The LS series is known for its compatibility with standard TTL logic levels while offering improved power consumption characteristics compared to earlier standard logic families. It serves as a foundational building block for digital systems requiring reliable bus interfacing.

Replacement Considerations

Compatible substitutes include the HD74LS641FPEL, which offers non-inverted open-collector outputs instead of inverted three-state outputs. Designers must verify pinout compatibility and electrical parameter differences, particularly regarding output drive strength and loading capabilities, before implementing any cross-replacement.