SNJ54S195J

Overview

The SNJ54S195J is a 4-bit parallel-access shift register manufactured by Texas Instruments. It features a dual clock system with separate inputs for serial data and clock pulses, enabling flexible data shifting operations. The device operates within a military-grade temperature range of -55°C to 125°C and utilizes a 16-pin ceramic dual in-line package (CDIP). Key electrical characteristics include an operating voltage range of 4.5V to 5.5V. It supports both serial-in/parallel-out and parallel-in/serial-out configurations through dedicated control pins.

Feature Summary

• Dual clock architecture allowing independent control of serial data input and clocking operations
• Parallel access capability for simultaneous loading or reading of all four bits
• Military-grade reliability designed for operation in extreme environmental conditions
• Ceramic packaging providing enhanced durability and thermal stability

Applications

• Serial-to-parallel data conversion in digital communication systems
• Parallel-to-serial data transmission interfaces
• Digital signal processing circuits requiring bit manipulation
• Test equipment utilizing high-reliability logic components

Procurement Notes

Verify the component suffix 'J' confirms the ceramic DIP package and military temperature rating. Ensure the datasheet matches the specific revision for pinout accuracy. Confirm compliance with export control classifications if applicable. Validate that the source document explicitly lists this part number to avoid confusion with similar plastic packages or commercial grade variants.

Selection Notes

Select this component when military-grade temperature tolerance and ceramic package durability are required. The dual-clock design offers timing flexibility compared to single-clock alternatives. Consider the 4-bit width for simple shift applications rather than larger registers. Verify power supply constraints align with the specified 4.5V to 5.5V range before integration into the circuit design.

Part Context

This part belongs to the SN54xx series of logic integrated circuits, which are distinguished by their extended temperature ranges and robust construction suitable for aerospace and defense applications. Unlike the SN74xx commercial series, the SN54xx series ensures functionality across wider thermal extremes. The SNJ54S195J specifically implements Schottky TTL technology for improved speed and power efficiency relative to standard TTL devices.

Replacement Considerations

• SN54LS195J
• SN54S195N

FAQ

What is the difference between the serial and parallel clock inputs?

The serial clock controls the shifting of data into the flip-flops one bit at a time, while the parallel clock enables the simultaneous loading of data from the parallel inputs into the register.

Can this device operate without using the parallel load feature?

Yes, the parallel load function can be disabled, allowing the device to operate solely as a serial-in/serial-out or serial-in/parallel-out shift register based on the control pin states.