74HCT40105N,112

Overview

The 74HCT40105N,112 is a first-in/first-out elastic storage register manufactured by NXP USA Inc. It stores 16 words of 4-bit data and handles input and output data at different shifting rates. The device features independent asynchronous inputs and outputs, expandability in either direction, reset capability, status indicators on inputs and outputs, and 3-state outputs. It complies with JEDEC standard JESD7A and includes ESD protection exceeding 2000 V (HBM) and 200 V (MM). Input levels are TTL compatible for the HCT variant. It operates from -40 °C to +125 °C and is housed in a DIP16 package.

Feature Summary

• Asynchronous FIFO buffer capable of handling input and output data at different shifting rates
• Status indicators including Data-In-Ready (DIR) and Data-Out-Ready (DOR) flags
• Expandable in either direction using additional logic gates or cascading
• TTL-compatible input levels with high-speed burst mode support

Applications

• Buffering between asynchronous systems
• Data rate conversion interfaces
• Elastic storage registers in digital communication links

Procurement Notes

Verify the exact part number suffix against the manufacturer's current ordering information to ensure correct package type and temperature range specifications. Confirm that the TTL input voltage requirements align with your system logic levels before integration. Check for any recent product change notices regarding pinout or electrical characteristics updates.

Selection Notes

Select this component when an asynchronous FIFO buffer with 4-bit word width and 16-word depth is required. Ensure the system logic operates within the TTL input voltage thresholds specified for the HCT series. Consider the DIP16 package constraints if board space allows for through-hole mounting rather than surface-mount alternatives.

Part Context

This component belongs to the 74HC/HCT40105 family of high-speed Si-gate CMOS devices. It is pin-compatible with the 4000B series 40105 devices but offers improved switching speeds and lower power consumption typical of modern CMOS technology. The family supports various package options including SO, SSOP, TSSOP, and DIP configurations.

Replacement Considerations

74HC40105N,112