M74HC259YRM13TR

Latches Overview

The M74HC259YRM13TR is a high-speed CMOS 8-bit addressable latch manufactured using silicon gate C2MOS technology. It features a single data input (D), eight latch outputs (Q0-Q7), three address inputs (A, B, and C), a common enable input (E), and a common clear input. The device operates within a supply voltage range of 2 V to 6 V. Key electrical parameters include a propagation delay of 56 ns, a maximum static power supply current of 4 µA at 25 °C, and symmetrical output impedance with minimum source/sink currents of 4 mA. It is qualified under AEC-Q100 standards and housed in an SO-16 surface-mount package.

Latches Feature Summary

• Provides 8-bit addressable latching functionality allowing data entry into specific outputs via three address lines while leaving unaddressed latches unaffected.
• Features a common enable input that controls data flow; data is stored on the positive-going edge of the enable pulse when enabled low.
• Includes a common clear input that resets all latches to the low state when the enable input is held high and taken low.
• Equipped with protection circuits on all inputs to guard against static discharge and transient excess voltage.

Latches Applications

• Data storage in microprocessor-based systems requiring selective memory addressing
• Address decoding for peripheral selection in digital logic circuits
• Interface between processors and external devices needing isolated latch states

Latches Procurement Notes

Verify the component matches the STMicroelectronics M74HC259YRM13TR designation, specifically noting the SO-16 package and HC logic series. Confirm AEC-Q100 qualification status if automotive application requirements are strict. Ensure the ordering suffix corresponds to the reel or cut tape format required by your assembly process. Cross-reference the manufacturer part number against official ST databases to avoid counterfeit components.

Latches Selection Notes

Select this component when designing circuits that require storing multiple bits of data independently without complex external decoding logic. It is suitable for applications needing wide operating voltage ranges from 2 V to 6 V. Consider the 56 ns propagation delay and 4 mA output drive capability for timing and load requirements. Verify compatibility with existing 74-series pinouts if replacing legacy designs.

Latches Part Context

This part belongs to the M74HC259 series of addressable latches from STMicroelectronics. It is part of the broader 74HC family of high-speed CMOS logic devices. The device is functionally compatible with standard 74LS259 equivalents but offers improved speed and lower power consumption due to advanced C2MOS fabrication technology.

Latches Replacement Considerations

Direct substitutes include other manufacturers' 74HC259 variants in SO-16 packages. Verify pinout compatibility and electrical specifications such as propagation delay and output current before substitution. Alternative packages like TSSOP-16 may require mechanical adaptation.