SN74ALS563BDW

Overview

The SN74ALS563BDW is an octal D-type transparent latch from the Texas Instruments ALS logic family, housed in a 20-pin SOIC package. It features inverted outputs with 3-state capability for direct bus driving. The device operates on a supply voltage of 4.5 V to 5.5 V and supports a commercial temperature range of 0°C to 70°C. Key electrical parameters include a low-level output current of 24 mA and a high-level output current of -2.6 mA at 5 V. Propagation delays from data input (D) to output (Q) are specified between 3 ns and 18 ns.

Feature Summary

• Features 3-state buffer-type outputs designed to drive highly capacitive or relatively low-impedance loads directly without interface components.
• Transparent latch operation allows Q outputs to follow the complements of D inputs while the latch-enable (LE) signal is high.
• Outputs are latched at the inverse of the levels set up at the D inputs when the LE signal transitions to a low state.
• A buffered output-enable (OE) input places outputs in either a normal logic state or a high-impedance state that does not significantly load bus lines.

Applications

• Implementing buffer registers
• I/O ports
• Bidirectional bus drivers
• Working registers

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact package type and tube quantity. Ensure the component meets the required RoHS compliance status and moisture sensitivity level for your assembly process. Confirm the operating temperature range aligns with your system specifications before finalizing procurement.

Selection Notes

Select this component for designs requiring octal data storage with inverted outputs and high-drive 3-state capabilities. The ALS series offers a balance of speed and power consumption suitable for general-purpose digital systems. Consider the SOIC package dimensions and thermal impedance characteristics during PCB layout planning.

Part Context

This part belongs to the SN74ALS563B family of octal transparent latches. It is functionally related to other devices in the ALS series but distinguished by its specific latch-enable control and inverted 3-state outputs. The 'DW' suffix indicates the small-outline integrated circuit package variant.

Replacement Considerations

SN74ALS563BN

FAQ

How does the latch-enable (LE) input affect the output state?

When LE is high, the outputs follow the complements of the data inputs. When LE goes low, the outputs are latched at the inverse of the levels present at the D inputs.

What is the purpose of the output-enable (OE) input?

The OE input controls the 3-state outputs, placing them in either a normal logic state or a high-impedance state. This allows the outputs to disconnect from the bus without affecting internal latch operations.