MC74LCX244ADTR2G

Overview

The MC74LCX244ADTR2G is a low-voltage CMOS octal buffer with 5 V-tolerant inputs and outputs, operating from a 1.65 V to 3.6 V supply. It features non-inverting logic with three-state outputs controlled by OE inputs. The device provides balanced output sink and source capabilities of 24 mA. Static supply current is 10 µA at 3.6 V. Propagation delay ranges from 6.5 ns to 10.3 ns depending on voltage. Input leakage is ±5.0 µA, and output leakage is ±5.0 µA. Operating temperature spans -40°C to +125°C.

Feature Summary

• Provides 5 V tolerance for safe interfacing between 5 V TTL devices and low-voltage logic systems.
• Supports live insertion and withdrawal without damaging the circuit or connected components.
• Guarantees high-impedance state when power is removed via IOFF specification to prevent bus interference.

Applications

• Memory address driving in computer systems
• TTL level bus oriented transceiver applications
• Interface capability with 5 V TTL logic

Procurement Notes

Verify the specific suffix 'DTR2G' corresponds to the TSSOP-20 package and tape & reel shipping configuration. Confirm RoHS compliance and lead-free status requirements match project specifications. Ensure the ordering quantity aligns with the standard 2500-unit reel size if bulk procurement is intended.

Selection Notes

Select this component when interfacing 5 V sources with 1.65 V to 3.6 V loads requiring high drive strength. The 24 mA output capability supports direct driving of moderate capacitive loads. Consider the TSSOP-20 package constraints for PCB layout. Verify that the propagation delay meets system timing requirements across the full operating temperature range.

Part Context

This part belongs to the MC74LCX244A family of low-voltage CMOS buffers. It serves as an octal version of single-channel buffers, providing eight independent signal paths. The LCX series is designed for compatibility with both LVTTL and LVCMOS standards while maintaining robust performance in mixed-voltage environments.

Replacement Considerations

MC74LCX244AMN2TWG (QFN20 package variant).

FAQ

How does the device handle power-down conditions?

The IOFF specification ensures that outputs enter a high-impedance state when VCC is 0 V, preventing back-powering or interference with other circuits on the bus.

What is the maximum input voltage allowed?

The DC input voltage can withstand up to 6.5 V, allowing safe operation when driven by 5 V logic devices despite the lower supply voltage.