HEF4517BT,518

Shift Registers Overview

The HEF4517BT is a dual 64-bit static shift register manufactured by NXP Semiconductors. It contains two identical, independent registers with separate clock (nCP), data input (nD), and parallel input-enable/output-enable (nPE/OE) controls. Each register provides four 3-state outputs at the 16th, 32nd, 48th, and 64th bit positions. The device operates over a recommended VDD power supply range of 3 V to 15 V referenced to VSS. It complies with JEDEC standard JESD 13-B and functions across the full industrial temperature range from -40 °C to +85 °C.

Shift Registers Feature Summary

• Fully static operation tolerant of slow clock rise and fall times
• Configurable as one 64-bit or four 16-bit shift registers via nPE/OE control
• Standardized symmetrical output characteristics for reliable interfacing

Shift Registers Applications

• Industrial applications requiring serial-to-parallel conversion
• Data storage and buffering in embedded systems
• Control logic for sequential operations

Shift Registers Procurement Notes

Verify the specific package variant against project requirements. The HEF4517B family includes DIP16 (HEF4517BP) and SO16 (HEF4517BT) packages. Confirm that the selected package matches the PCB footprint and assembly specifications. Ensure the operating environment stays within the specified -40 °C to +85 °C temperature range for proper functionality.

Shift Registers Selection Notes

Select this component when a design requires dual independent shift registers with high noise immunity due to Schmitt-trigger inputs. The ability to divide the 64-bit register into four 16-bit segments offers flexibility for different data widths. Ensure the supply voltage aligns with the 3 V to 15 V operating range and that the load capacitance is considered for dynamic performance calculations.

Shift Registers Part Context

The HEF4517B belongs to the HEF4500B series of CMOS logic devices. It is functionally similar to other dual 64-bit shift registers like the MC14517B. The 'BT' suffix indicates the SO16 plastic small outline package version. This component is part of NXP's legacy standard logic portfolio designed for general-purpose digital applications.

Shift Registers Replacement Considerations

The ON Semiconductor MC14517B is a documented equivalent part number offering the same dual 64-bit static shift register functionality. Verify pin compatibility and electrical parameters before substitution.