74LCX373SJX

Latches Overview

The Fairchild Semiconductor 74LCX373SJX is an octal transparent D-type latch featuring three-state outputs, designed for low-voltage applications. It operates within a supply voltage range of 2.0V to 3.6V and supports 5V tolerant inputs and outputs, facilitating seamless interfacing between 3.3V logic systems and 5V environments. The device utilizes advanced CMOS technology to achieve high-speed operation while maintaining low power dissipation. Packaged in a 20-pin Small Outline Package (SOP), it contains eight D-type latches with separate data inputs and outputs, controlled by a Latch Enable input and an Output Control input to manage data retention and bus isolation.

Latches Feature Summary

• Octal D-type latch architecture with transparent data capture when enabled
• Three-state output capability for effective bus line interfacing
• 5V tolerant inputs and outputs ensuring compatibility with mixed-voltage systems
• Advanced CMOS fabrication for high-speed performance and low power consumption

Latches Applications

• Bus-organized systems requiring data storage and buffering
• Interfacing 3.3V logic circuits with 5V signal environments
• Portable and battery-powered equipment due to low power characteristics
• High-density memory and I/O mapping applications

Latches Procurement Notes

Verify the specific suffix SJX against the manufacturer's current datasheet to confirm package dimensions and pinout compatibility. Ensure the component meets RoHS compliance requirements if mandated by your assembly standards. Cross-reference the ordering part number with official Fairchild or onsemi distribution channels to avoid obsolete stock. Confirm that the 5V tolerance specifications align with your system's maximum input voltage limits to prevent damage.

Latches Selection Notes

Select this component when an octal latch with three-state outputs is required for low-voltage digital designs. It is suitable for systems needing direct interface with 5V buses without level shifting. Consider the SOP-20 package constraints regarding PCB space. Verify that the propagation delay and drive current meet the timing requirements of your specific application circuit before finalizing the design.

Latches Part Context

The 74LCX373 belongs to the LCX family of low-voltage CMOS logic devices, which are optimized for 3.3V operation while maintaining compatibility with legacy 5V systems. This series offers improved speed and lower power consumption compared to older HC or HCT families. The 74LCX373 specifically provides octal latching functionality, making it a standard solution for data storage in microprocessor-based systems and communication interfaces.

Latches FAQ

What is the function of the Output Control input?

When a high logic level is applied to the Output Control input, all Q outputs enter a high-impedance state, regardless of the signals at the D inputs or the state of the storage elements.

How does the Latch Enable input affect data retention?

When the Latch Enable input is HIGH, the Q outputs follow the D inputs. When it goes LOW, the data present at the D inputs is retained at the outputs until the Latch Enable returns HIGH.