MM74HC259MTCX

Latches Overview

The MM74HC259MTCX is an 8-bit addressable latch and 3-to-8 line decoder manufactured by onsemi. It features a single data input (D), eight latch outputs (Q1–Q8), three address inputs (A, B, C), a common enable input (G), and a common clear input. The device operates within a supply voltage range of 2 V to 6 V and supports an operating temperature range of -40°C to +85°C. Key electrical parameters include a typical propagation delay of 18 ns, maximum quiescent current of 80 μA, and maximum input current of 1 μA. It is housed in a 16-lead Thin Shrink Small Outline Package (TSSOP).

Latches Feature Summary

• Implements 8-bit addressable latch functionality with independent storage for each output channel.
• Functions as a 3-to-8 line decoder when the enable input is held low.
• Includes input protection circuits against static discharge and transient excess voltage.
• Utilizes advanced silicon-gate CMOS technology for high-speed operation and low power consumption.

Latches Applications

• General purpose digital system storage applications
• Memory addressing and selection circuits
• Data routing and multiplexing systems

Latches Procurement Notes

Verify the specific ordering code suffix 'MTCX' corresponds to the TSSOP-16 package and tape/reel packaging configuration. Confirm that the manufacturer designation aligns with onsemi, noting historical Fairchild Semiconductor origins. Ensure compliance with RoHS directives and check for any specific environmental or life support usage restrictions defined in the official datasheet before procurement.

Latches Selection Notes

Select this component for designs requiring precise control over individual latch states via address lines rather than parallel loading. Consider the 2 V to 6 V supply range compatibility with standard logic families. Evaluate the 18 ns typical propagation delay against system timing requirements. Verify that the TSSOP-16 package dimensions fit the available PCB real estate and thermal constraints.

Latches Part Context

This part belongs to the MM74HC series of high-speed CMOS logic devices. It serves as a specialized memory element distinct from standard shift registers or latches by allowing direct access to any of the eight outputs through a binary address code. The device bridges the gap between simple decoders and complex memory arrays, offering a compact solution for sequential data handling in embedded systems.

Latches Replacement Considerations

MM74HC259MTC

Latches FAQ

How does the device behave when the Enable input is LOW?

When the Enable input is LOW, the device functions as a 3-to-8 line decoder. All latches except the one addressed by inputs A, B, and C are cleared to a LOW state, while the addressed latch follows the Data input.

What is the function of the Clear input?

If the Enable input is HIGH and the Clear input is taken LOW, all eight latches are cleared to a LOW state regardless of the address inputs.