DM74LS533N

Overview

The DM74LS533N is an 8-bit D-type flip-flop latch manufactured by Rochester Electronics, LLC. It belongs to the LS (Low-power Schottky) series of TTL logic devices. The component features eight independent latches with three-state outputs, allowing for bus-organized system applications. It is housed in a 20-pin Plastic Dual In-line Package (PDIP). The device operates with standard TTL input levels and provides true output signals. Key functional attributes include transparent data appearance when the latch enable is active and high-impedance states when disabled.

Feature Summary

• Eight independent D-type flip-flop latches for parallel data storage
• Three-state outputs enabling direct connection to system buses
• Transparent data transfer when latch control is active
• High-impedance output state when latch is disabled

Applications

• Bus-organized system data storage
• Parallel-to-serial data conversion interfaces
• Temporary data holding in digital logic circuits

Procurement Notes

Verify the manufacturer origin, as Rochester Electronics sources components from original manufacturers. Confirm lead-free status and RoHS compliance requirements against specific project needs. Check for leaded vs. non-leaded terminal finishes. Ensure the PDIP-20 package matches the target PCB footprint. Validate that the LS series speed and power characteristics meet the design specifications.

Selection Notes

Select this component for applications requiring 8-bit parallel data latching with bus isolation capabilities. The LS series offers a balance of speed and power consumption suitable for general-purpose TTL systems. Consider the three-state output feature if multiple devices share a common data bus. Verify voltage compatibility with the rest of the TTL logic family in the design.

Part Context

This part is part of the broader 74LS533 family of octal latches. Rochester Electronics specializes in providing obsolete and hard-to-find semiconductor components, often sourcing them from original equipment manufacturers or authorized channels. The DM prefix typically denotes a commercial grade variant within the Fairchild/National Semiconductor lineage.

Replacement Considerations

Compatible substitutes include SN74LS533N and MC14533B. Verify pinout compatibility and electrical characteristics before substitution. Ensure the replacement maintains the three-state output functionality required for bus applications.