DM74ALS652NT

Overview

The DM74ALS652NT is an octal 3-STATE bus transceiver and register manufactured by onsemi. It features a 24-Lead Plastic Dual-In-Line Package (PDIP). The device operates within a supply voltage range of 4.5V to 5.5V and supports a clock frequency up to 40 MHz. Propagation delays range from 5ns to 35ns depending on the signal path. It provides high-level output currents of -15mA and low-level output currents of 24mA, with a maximum operating temperature of +70°C.

Feature Summary

• Incorporates an octal transceiver and an octal D-type register for data transmission between buses or internal registers.
• Features totem-pole 3-STATE outputs designed to drive highly-capacitive or low-impedance loads directly without interface components.
• Includes multiplexed real-time and stored data capabilities controlled by SAB and SBA select pins.
• Utilizes independent registers and enables for A and B buses to support multiple modes of operation.

Applications

• Implementing buffer registers in digital systems.
• Serving as I/O ports for data interfacing.
• Functioning as bidirectional bus drivers.
• Operating as working registers in memory-decoding applications.

Procurement Notes

Verify that the component matches the specific PDIP package configuration and ordering code N24C. Confirm the manufacturer origin, noting historical production by Fairchild Semiconductor prior to acquisition by onsemi. Ensure the datasheet revision date aligns with project requirements, as this component represents legacy technology. Validate pinout compatibility with existing PCB layouts before integration.

Selection Notes

Select this component when an octal bidirectional bus driver with integrated storage is required. It is suitable for designs needing direct connection to bus lines without additional pull-up resistors. Consider the 3-STATE output capability for efficient bus sharing. Evaluate the propagation delay specifications against system timing constraints to ensure data integrity during transitions between real-time and stored data modes.

Part Context

This part belongs to the 74ALS logic family, utilizing advanced oxide-isolated, ion-implanted Schottky TTL process technology. It is designed for high-performance applications requiring fast switching speeds. The device is functionally compatible with other standard 74-series logic families but offers improved speed and power characteristics typical of the ALS designation.

Replacement Considerations

Public confirmed substitute part numbers: None identified in source material.