M74HC155B1R

Overview

The M74HC155B1R is a high-speed CMOS dual 2-to-4 line decoder fabricated with silicon gate C2MOS technology. It features two independent decoders with individual strobe inputs (1G, 2G), data inputs (1C, 2C), and common binary address inputs (A, B). The device operates within a wide voltage range of 2V to 6V and supports an operating temperature from -55°C to +125°C. Typical propagation delay is 13ns at 6V supply. Quiescent supply current is maximized at 4μA at 25°C. It provides symmetrical output impedance with minimum drive capability of 4mA.

Feature Summary

• Dual 2-to-4 line decoding architecture with common binary address inputs
• Individual strobe control for each decoder section
• High noise immunity with input protection against static discharge
• Pin and function compatibility with standard 74 series logic

Applications

• Data routing in digital systems
• Address decoding for memory or peripheral selection
• Demultiplexing applications requiring dual channels
• Building 3-to-8 line decoders by combining sections

Procurement Notes

Verify component authenticity through authorized STMicroelectronics distributors or certified partners. Confirm the specific ordering suffix matches the required package type, as the B1R suffix corresponds to the DIP-16 tube packaging. Check for RoHS compliance status and ensure the obsolete product status does not conflict with long-term availability requirements for the design.

Selection Notes

Select this component when dual independent decoding paths are required within a single package. The HC series offers speed comparable to LSTTL with lower power consumption. Ensure the design accommodates the 2V to 6V supply range and verify that the 4mA output drive meets the load requirements. Consider the DIP-16 package constraints if surface mount alternatives like TSSOP are preferred for space-limited designs.

Part Context

This part belongs to the M74HC155 family of dual decoders manufactured by STMicroelectronics. It utilizes advanced C2MOS technology to achieve high speed while maintaining low power dissipation. The device is designed to be pin-compatible with other industry-standard 74 series decoders, facilitating direct replacement in existing circuits without layout modifications.

Replacement Considerations

Direct substitutes include other manufacturers' 74HC155 equivalents such as those from Texas Instruments or NXP, provided they match the DIP-16 package and electrical specifications. Verify that any replacement maintains the same propagation delay characteristics and output drive capabilities under identical load conditions.