SN74ACT573NE4

Overview

The SN74ACT573NE4 is an octal D-type transparent latch with three-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 4.5V to 5.5V and features inputs compatible with TTL voltage levels. The device provides high drive capability, supporting low-level output currents up to 24mA and high-level output currents up to -24mA. Propagation delays are specified with maximum values of 10.5ns from data inputs to outputs and 9.5ns from the latch enable input to outputs at 5V. The component is housed in a 20-pin PDIP package and supports operating temperatures from -40°C to +85°C.

Feature Summary

• Features eight D-type transparent latches with three-state outputs for bus-driven applications
• Provides high drive capability suitable for driving highly capacitive or low-impedance loads
• Includes buffered output-enable control to isolate bus lines without loading effects
• Inputs accept voltages up to 5.5V ensuring compatibility with standard logic families

Applications

• Parallel data storage systems
• Digital bus buffering and interface
• Implementation of I/O ports
• Working registers in microprocessor systems

Procurement Notes

Verify that the ordering suffix 'E4' corresponds to lead-free packaging and RoHS compliance as defined by Texas Instruments standards. Confirm the specific package variant matches the required PCB footprint, as the base model number covers multiple package options including SOIC, SSOP, and VQFN. Ensure the procurement channel sources catalog-grade parts rather than military or automotive variants unless explicitly required.

Selection Notes

Select this component when designing systems requiring octal data latching with high-drive three-state outputs. It is appropriate for applications needing TTL-compatible inputs and operation within a strict 4.5V to 5.5V power supply window. Consider the propagation delay specifications if timing constraints are critical for the target bus architecture.

Part Context

This part belongs to the SNx4ACT573 family of octal D-type transparent latches. The family includes military-grade (SN54ACT573) and catalog-grade (SN74ACT573) versions. The 'N' suffix specifically denotes the 20-pin Plastic Dual In-Line Package (PDIP), distinguishing it from surface-mount options like SOIC or TSSOP available within the same logical family.

Replacement Considerations

Direct functional substitutes include other SN74ACT573 variants with different package suffixes such as SN74ACT573DW (SOIC) or SN74ACT573DBR (SSOP). Cross-family replacements like SN74HC573 offer similar functionality but differ in drive current and speed characteristics.