M74HC42B1R

Overview

The M74HC42B1R is a high-speed CMOS BCD to decimal decoder manufactured using silicon gate C2MOS technology. It features four data inputs (A-D) and ten decimal outputs (Y0-Y9). The device operates within a supply voltage range of 2V to 6V, with an operating temperature range from -55°C to +125°C. Key electrical characteristics include a typical propagation delay of 14ns at 6V, a maximum quiescent supply current of 4μA at 25°C, and symmetrical output impedance with minimum currents of 4mA for both high and low states.

Feature Summary

• High-speed decoding capability utilizing silicon gate C2MOS technology
• Wide operating voltage range supporting 2V to 6V power supplies
• High noise immunity with input thresholds defined as percentages of VCC
• Built-in protection circuits against static discharge and transient excess voltage

Applications

• Code conversion systems
• Address decoding in memory architectures
• Memory selection logic
• Demultiplexing applications
• Readout decoding circuits

Procurement Notes

Verify component authenticity through authorized channels due to obsolete status. Confirm package integrity and pin alignment prior to integration. Review datasheet specifications for absolute maximum ratings to prevent damage during handling or operation. Ensure compatibility with existing system voltage levels and signal timing requirements before deployment.

Selection Notes

Select this component for designs requiring direct BCD to decimal translation with minimal power consumption. Consider the wide temperature range for industrial environments. Evaluate the propagation delay specifications against system clock speeds. Verify that the DIP-16 package fits the available board space and manufacturing constraints.

Part Context

This part belongs to the M74HC42 series of logic decoders produced by STMicroelectronics. It is functionally compatible with the standard 74 Series 42 devices. The 'B1R' suffix indicates the specific tube packaging configuration for the DIP-16 variant. The series utilizes high-speed CMOS technology optimized for low power dissipation.

Replacement Considerations

Direct substitutes may include other manufacturers' 74HC42 equivalents. Verify pin compatibility and electrical specifications such as propagation delay and supply current. Check for availability in the required DIP-16 package. Ensure functional equivalence for code conversion and address decoding tasks.