BU4021BF-E2

Shift Registers Overview

The BU4021BF-E2 is an 8-bit static shift register from the ROHM 4000B CMOS logic series. It features parallel input capabilities and serial output conversion controlled by a P/S pin. The device operates within a supply voltage range of 3V to 18V and supports a maximum clock frequency of up to 8.0 MHz at 15V. It includes eight register cells with dedicated parallel data inputs (P1-P8) and a serial data input (DS). The component is designed for surface-mount installation in SOP-16 packages, ensuring compatibility with standard automated assembly processes.

Shift Registers Feature Summary

• Supports both parallel-to-serial and serial-in/serial-out data transfer modes via the P/S control pin.
• Provides direct access to internal register states through external outputs Q6, Q7, and Q8.
• Operates reliably across a wide industrial temperature range from -40°C to +85°C.

Shift Registers Applications

• Data acquisition systems requiring parallel-to-serial conversion
• LED display matrix scanning circuits
• Digital signal processing interfaces

Shift Registers Procurement Notes

Verify the specific suffix E2 against current manufacturer documentation to confirm compliance with RoHS directives and REACH standards. Confirm package type availability as SOP-16. Check for end-of-life status or obsolescence notices directly from ROHM Semiconductor before finalizing procurement plans.

Shift Registers Selection Notes

Select this component when an 8-bit shift register with parallel load capability is required in a surface-mount design. Ensure the application voltage does not exceed the 18V maximum rating. Consider the propagation delay characteristics relative to the system clock speed to maintain signal integrity during high-frequency operations.

Shift Registers Part Context

This part belongs to the BU4021B family of standard CMOS logic ICs manufactured by ROHM Semiconductor. It serves as a digital storage element within larger logic circuits, facilitating data movement between parallel buses and serial communication lines in embedded systems.

Shift Registers Replacement Considerations

BU4021B

Shift Registers FAQ

What is the function of the P/S pin?

The P/S pin controls the operating mode. When low, it enables parallel loading of data into the register cells. When high, it switches the device to serial shift operation.

How many external outputs are available?

The device provides three external outputs: Q6, Q7, and Q8. The remaining stages (Q1-Q5) are internal and not accessible externally.