DM74ALS165M

Shift Registers Overview

The DM74ALS165M is an octal parallel-in serial-out shift register manufactured by Fairchild Semiconductor. It operates within a supply voltage range of 4.5 V to 5.5 V and features a propagation delay of 20 ns at 5V with 50 pF load. The device supports a clock frequency up to 80 MHz and includes a serial input, parallel data inputs, and a serial output. It is housed in a 16-lead SOIC package and functions within a temperature range of 0°C to +70°C.

Shift Registers Feature Summary

• Provides eight-bit parallel-to-serial conversion capability for data transmission applications
• Includes dedicated clear and clock inhibit inputs for precise timing control
• Features high-speed switching characteristics suitable for synchronous digital systems

Shift Registers Applications

• Data acquisition systems requiring parallel input buffering
• Microprocessor interface circuits for expanding I/O capabilities
• Serial communication link interfaces

Shift Registers Procurement Notes

Verify the specific manufacturer marking on the component body, as Fairchild Semiconductor operations were acquired by ON Semiconductor. Confirm that the part number suffix 'M' corresponds to the SOIC-16 package variant required for your PCB footprint. Ensure compatibility with existing logic levels and power supply constraints before finalizing procurement orders.

Shift Registers Selection Notes

Select this component when an octal shift register with parallel load functionality is required in a surface-mount design. It serves as a functional equivalent to other 74ALS165 variants from different manufacturers, provided pinouts and electrical specifications align with the system requirements. Consider the 20 ns propagation delay when designing high-frequency clock paths.

Shift Registers Part Context

This component belongs to the Advanced Low-power Schottky (ALS) logic family, which offers improved speed and lower power consumption compared to standard TTL devices. The DM74ALS165 series is widely used in legacy and industrial electronics where reliable serial data shifting is necessary. It maintains pinout compatibility with earlier 74S165 designs while enhancing performance metrics.

Shift Registers Replacement Considerations

Direct substitutes include the SN74ALS165N or MC140165B, though package differences may require adapter solutions. Verify that alternative sources meet the same ALS electrical standards and operating temperature ranges to ensure circuit reliability without modification.