SN74LS75N

Latches Overview

The SN74LS75N is a quad D-type latch manufactured by Texas Instruments using Low-power Schottky (LS) TTL technology. It features four independent transparent latches with complementary outputs, designed for temporary binary information storage between processing and I/O units. The device operates within a supply voltage range of 4.75V to 5.25V and supports a typical propagation delay of 19ns. It utilizes high-level triggering for data latching and includes diode-clamped inputs to suppress transmission line effects.

Latches Feature Summary

• Provides four independent transparent D-type latches with complementary Q and Q-bar outputs.
• Utilizes Low-power Schottky (LS) technology to reduce power consumption while maintaining standard TTL speed compatibility.
• Features diode-clamped inputs to inhibit fast-switching transient voltages and suppress ringing.
• Operates in transparent mode when the enable input is high, allowing data to pass directly to the output.

Latches Applications

• Temporary storage of binary information between processing units and input/output devices.
• Data buffering where information must be held stable during clock transitions.
• General-purpose digital logic circuits requiring parallel-to-parallel data retention.

Latches Procurement Notes

Verify the specific manufacturer part number against official Texas Instruments documentation to confirm the LS logic family and PDIP-16 package configuration. Ensure that the procurement source provides valid RoHS compliance data if required by the design specifications. Cross-reference the datasheet revision history to confirm pinout and electrical parameter consistency before finalizing component selection.

Latches Selection Notes

Select this component when a design requires multiple independent latches with complementary outputs in a single package. The LS series offers an optimal balance of switching speed and power dissipation for general-purpose applications. Consider the 19ns propagation delay and 5V operating voltage requirements to ensure compatibility with the surrounding TTL logic family components in the system architecture.

Latches Part Context

The SN74LS75 belongs to the widely adopted 7400-series of digital logic integrated circuits. As a member of the Low-power Schottky family, it represents a significant evolution from standard TTL designs by offering improved noise immunity and lower static power consumption. This specific variant remains a foundational building block for legacy and industrial control systems requiring reliable parallel data storage capabilities.

Latches FAQ

How does the SN74LS75N handle data when the enable input transitions from high to low?

When the enable input transitions from high to low, the device enters the latch mode. The output state is frozen at the value present at the data input at the moment of transition, holding that value until the enable input returns to a high state.

What is the purpose of the diode clamping on the inputs?

The inputs are diode-clamped to suppress fast-switching transient voltages. This design feature inhibits damaging ringing effects that may occur due to over-shoot or undershoot on slow-rising or slow-falling signals, thereby simplifying system design.