CD54HCT259F3A

Latches Overview

The CD54HCT259F3A is an 8-bit addressable latch from the Texas Instruments CDx4HC(T)259 family, housed in a 16-pin ceramic dual in-line package (CDIP). It operates within a supply voltage range of 4.5 V to 5.5 V and supports a temperature range of -55°C to 125°C. The device features buffered inputs and outputs with typical propagation delays of 15 ns at VCC = 5V and CL = 15pF. It provides direct LSTTL input logic compatibility with a maximum low-level input voltage of 0.8 V and a minimum high-level input voltage of 2 V.

Latches Feature Summary

• Supports four distinct operating modes: addressable latch, memory, 8-line demultiplexer, and clear.
• Features buffered inputs and outputs for improved signal integrity.
• Provides direct compatibility with LSTTL logic levels.
• Designed for general-purpose storage applications in digital systems.

Latches Applications

• Working registers in digital systems
• Serial-holding registers
• Active-high decoders or demultiplexers

Latches Procurement Notes

Verify that the component matches the specific military-grade CD54 series designation rather than commercial variants. Confirm the presence of the F3A suffix indicating the ceramic CDIP package. Ensure the datasheet revision aligns with current design requirements. Check for RoHS exemption status as applicable to this specific part number. Validate supplier authenticity due to potential availability variations.

Latches Selection Notes

Select this component when TTL-compatible CMOS logic is required for addressable data storage. The HCT series ensures compatibility with existing LSTTL interfaces without level shifting. Consider the wide operating temperature range for harsh environments. Evaluate the need for three-state outputs if bus driving is required, though this specific latch type focuses on addressable storage functions.

Latches Part Context

This device belongs to the CDx4HC(T)259 family of high-speed SMOS logic devices. It is functionally similar to other addressable latches but distinguished by its HCT input characteristics. The CD54 prefix indicates a military-grade qualification, offering enhanced reliability compared to standard commercial counterparts like the CD74 series.

Latches Replacement Considerations

Compatible substitutes include CD54HC259F3A for HC series operation and CD74HCT259E for commercial grade PDIP packages. Verify pinout compatibility and electrical specifications before substitution.

Latches FAQ

What are the four operating modes of the CD54HCT259F3A?

The device supports addressable latch mode, memory mode, 8-line demultiplexer mode, and clear mode, selectable via CLR and G inputs.

Is the CD54HCT259F3A compatible with LSTTL logic?

Yes, the HCT series provides direct LSTTL input logic compatibility with specified voltage thresholds.