SN74HC259DRG4

Overview

The SN74HC259DRG4 is an 8-bit addressable latch manufactured by Texas Instruments, belonging to the SN74HC series of high-speed CMOS logic devices. It features serial input and parallel outputs, allowing individual data bits to be latched at specific addresses. The device operates within a supply voltage range of 2 V to 6 V and supports through-hole or surface-mount installation depending on the package variant. Key electrical parameters include a propagation delay of 130 ns at 2 V, 26 ns at 4.5 V, and 22 ns at 6 V. Static current is specified at 8 uA, with low-level output current capability of 32 mA and high-level output current of -5.2 mA. The operating temperature range extends from -40°C to +85°C.

Feature Summary

• Provides eight individually addressable latches for precise data storage control
• Enables serial-to-parallel conversion with dedicated address decoding inputs
• Offers non-inverting outputs suitable for direct interface with digital systems

Applications

• Data storage in microprocessor-based systems requiring addressable memory elements
• Parallel output expansion for serial communication interfaces
• Control signal latching in industrial automation and instrumentation

Procurement Notes

Verify the exact package type (e.g., SOIC-16 vs. TSSOP-16) as the 'DRG4' suffix indicates a specific reel-packaged variant but does not define the physical footprint alone. Confirm RoHS compliance status and ensure the selected component matches the required pinout for your PCB layout. Cross-reference the datasheet revision date to guarantee parameter accuracy against your design specifications.

Selection Notes

Select this component when designing circuits that require multiple independent latches controlled via a minimal number of pins. The HC series offers compatibility with standard TTL logic levels while maintaining low power consumption. Ensure the system voltage falls within the 2 V to 6 V range and verify that the propagation delay meets the timing requirements of your clock signals.

Part Context

This part belongs to the SN74HC259 family of 8-bit addressable latches. It is functionally equivalent to other manufacturers' 74HC259 variants but may differ in packaging or specific electrical characteristics. The 'DRG4' designation typically refers to a tape-and-reel version of the SOIC-16 package, distinguishing it from tube-packed or alternative package options within the same logical family.

Replacement Considerations

Direct substitutes include SN74HC259N (PDIP package) or SN74HC259D (SOIC package without G4 suffix). Verify pin compatibility and electrical specs before substitution. Other brands offering pin-compatible 74HC259 devices may require verification of propagation delays and output drive capabilities.