CDP1859CD

Specialized Overview

The CDP1859CD is a CMOS-compatible, 4-bit universal shift register manufactured by Harris Corporation. It features parallel load capability and supports serial input/output operations in both directions. The device operates within a standard voltage range typical for CMOS logic families and is housed in a 16-pin DIP package. Key electrical characteristics include a propagation delay of approximately 30 ns at 5V supply and high noise immunity. It includes dedicated clock inputs for shifting and loading data, making it suitable for basic digital storage and transfer tasks.

Specialized Feature Summary

• Supports bidirectional serial shifting with parallel load functionality
• CMOS technology ensures low power consumption and high noise immunity
• Includes independent clock inputs for shift and parallel load operations

Specialized Applications

• Data storage in digital systems
• Serial-to-parallel and parallel-to-serial conversion
• Basic shift register applications in control circuits

Specialized Procurement Notes

Verify the manufacturer source carefully as Harris Corporation's semiconductor assets were acquired by Renesas Electronics. Confirm the specific suffix 'CD' indicates ceramic DIP packaging and commercial temperature range. Check for RoHS compliance status as original Harris parts may not meet current environmental standards. Ensure availability from authorized distributors or surplus suppliers given the component's age.

Specialized Selection Notes

Select this component when a 4-bit shift register with parallel load is required in legacy designs. Compare against modern equivalents like the 74HC194 if pin compatibility and speed are critical. Consider the package type and operating temperature range to ensure fit for the target application environment. Verify logic family compatibility with existing system voltages before integration.

Specialized Part Context

The CDP1859CD belongs to the Harris CMOS logic family, specifically designed for general-purpose digital functions. It is part of a broader lineup of memory and logic devices produced by Harris Semiconductor before its acquisition. This component represents standard TTL/CMOS compatible logic used in mid-20th-century computing and industrial control systems.

Specialized Replacement Considerations

Direct pin-compatible replacements include the SN74LS194 or HD74LS194P for TTL versions, though voltage levels differ. For CMOS equivalents, consider the CD4015 or similar 4-bit shift registers, but verify functional differences such as parallel load capabilities. Always validate timing parameters against the new component's datasheet.