The UPD74HC195C is a high-speed silicon gate CMOS 4-bit parallel access shift register manufactured by NEC. It is designed for use in various digital logic applications requiring parallel or serial data manipulation. This device offers the benefits of CMOS technology, including low power consumption and high noise immunity, while maintaining high-speed operation.

Applications

• Data storage and manipulation: Used in applications requiring temporary data storage and shifting, such as buffer registers and sequence generators.
• Serial-to-parallel conversion: Employed in converting serial data streams into parallel data formats for processing or display.
• Parallel-to-serial conversion: Used to convert parallel data inputs into a serial data stream for transmission or other serial processing.
• Shift register functions: Implemented in applications that require data shifting for arithmetic operations, delay lines, or code conversion.
• Control circuits: Utilized within control systems and state machines where data shifting is necessary for sequential operations.

Features

• High-speed operation: Achieves high-speed performance with a typical propagation delay of around 15 ns.
• Parallel access: Offers parallel input and output capability for direct data loading and retrieval.
• Serial input/output: Includes serial input and output pins for serial data transfer and cascading with other shift registers.
• Asynchronous master reset: Provides an asynchronous master reset input to clear the register contents.
• Wide operating voltage range: Operates over a broad voltage range, typically from 2V to 6V.
• Low power consumption: Exhibits low static power consumption due to CMOS technology.
• High noise immunity: Offers high noise immunity, enhancing reliability in noisy environments.

Benefits

• Versatile data handling: Allows both serial and parallel data handling, making it suitable for various applications.
• Fast data processing: High-speed operation enables quick data processing and manipulation.
• Easy integration: Compatible with other TTL and CMOS logic devices for easy integration into existing systems.
• Reliable operation: High noise immunity ensures reliable performance even in challenging conditions.
• Energy efficiency: Low power consumption reduces energy requirements and heat dissipation.

Additional Details

The UPD74HC195C typically comes in a 16-pin DIP or SOIC package. The device is functionally equivalent to the 74HC195 and can be used as a direct replacement in many applications. It consists of four D-type flip-flops connected to perform shift register operations. The parallel inputs (A, B, C, D) allow for direct loading of data, while the serial input (J) enables serial data entry. The mode control input (SH/ĽD) determines whether the device operates in shift or load mode. The clock input (CP) synchronizes the data transfer. The Q outputs (QA, QB, QC, QD) provide the parallel data outputs, and the QH output provides the serial output. The asynchronous master reset (MR) clears all flip-flops to a low state.