SN74HC563N

Overview

The SN74HC563N is an octal transparent D-type latch with three-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 2 V to 6 V and supports a recommended operating temperature from -40°C to 85°C. The device features high-current outputs capable of driving up to 7.8 mA at 6 V, with typical propagation delays ranging from 23 ns to 44 ns depending on load conditions. It utilizes a 20-pin PDIP package.

Feature Summary

• Features eight-bit transparent latching functionality where outputs follow input complements when the latch-enable signal is active.
• Provides three-state outputs designed for direct bus line driving or connection to low-impedance loads without additional interface components.
• Includes a buffered output-enable input that isolates outputs into a high-impedance state to prevent bus loading.

Applications

• Buffer registers
• I/O ports
• Bidirectional bus drivers
• Working registers

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current Package Option Addendum to confirm the exact package type and material finish. Ensure the selected variant matches the required thermal resistance and moisture sensitivity level for the intended assembly process. Cross-reference the datasheet revision history to confirm compliance with updated electrical characteristics and absolute maximum ratings.

Selection Notes

Select this component for designs requiring wide voltage operation between 2 V and 6 V. Consider the high-current drive capability when interfacing with capacitive loads or multiple LSTTL inputs. Evaluate the propagation delay specifications relative to system timing requirements under the expected load capacitance and supply voltage conditions.

Part Context

This device belongs to the SNx4HC563 family of octal transparent D-type latches. It shares functional similarities with other logic families but is distinguished by its HC technology characteristics, including low power consumption and high-speed operation suitable for general-purpose digital applications.

Replacement Considerations

SN74HC563DW

FAQ

How does the Output Enable (OE) pin affect internal latch operations?

The OE pin only controls the external output state. It places outputs in a high-impedance state but does not affect the internal retention of data or the ability to enter new data while outputs are disabled.

What is the behavior of the outputs when the Latch Enable (LE) input is low?

When LE is low, the outputs are latched at the inverse levels present at the D inputs at the time of the transition. The outputs hold this state regardless of subsequent changes to the D inputs.