DM74S373N

Latches Overview

The DM74S373N is an octal D-type transparent latch manufactured by onsemi, formerly Fairchild Semiconductor. It features eight D-type latches with three-state outputs housed in a 20-pin PDIP package. The device operates within a supply voltage range of 4.75V to 5.25V and supports a propagation delay of 12ns. Output drive capabilities include 6.5mA for high logic levels and 20mA for low logic levels. It functions within an operating temperature range of 0°C to 70°C.

Latches Feature Summary

• Transparent latch operation allows outputs to follow inputs when the latch enable signal is active.
• Three-state outputs facilitate direct connection to bus systems without additional interface components.
• Totem-pole output structure provides sufficient drive capability for highly capacitive or low-impedance loads.

Latches Applications

• Buffer registers in digital systems
• I/O port implementations
• Bidirectional bus drivers
• Working registers in microprocessor architectures

Latches Procurement Notes

Verify component authenticity as this part is obsolete. Confirm pinout compatibility with legacy designs. Check for lead-free variants if environmental compliance is required. Ensure replacement parts match electrical specifications and package dimensions. Validate supplier credentials before purchase.

Latches Selection Notes

Select this component for legacy systems requiring Schottky TTL speed with CMOS-like noise immunity. Consider power consumption differences compared to modern CMOS alternatives. Evaluate thermal requirements against the specified operating temperature range. Assess bus loading characteristics to ensure signal integrity in high-capacitance environments.

Latches Part Context

This device belongs to the 74S series of high-speed Schottky TTL logic. It serves as a standard octal latch solution for older digital designs. The component was widely used in computer memory interfaces and peripheral control circuits during the era of parallel bus architectures.

Latches Replacement Considerations

SN74S373N by Texas Instruments is a confirmed direct substitute. Verify pin compatibility and electrical parameters before integration. Ensure the replacement matches the original package type and mounting requirements.

Latches FAQ

What is the function of the latch enable input?

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

How does the three-state feature benefit bus applications?

The three-state outputs allow the device to be connected directly to bus lines without needing interface or pull-up components, reducing system complexity.