M74HCT244TTR

Overview

The M74HCT244TTR is an octal bus buffer with three-state outputs manufactured by STMicroelectronics. It belongs to the HCT logic series and utilizes silicon gate CMOS technology. The device features non-inverting data transmission controlled by two active-low output enable inputs, each governing four outputs. It operates within a supply voltage range of 4.5 V to 5.5 V. Key electrical parameters include a maximum static current of 4 µA at 25°C and symmetrical output impedance with minimum currents of 6 mA for both high and low states. Propagation delay is typically 15 ns at 4.5 V.

Feature Summary

• Octal configuration providing eight non-inverting buffers with three-state outputs
• Dual active-low output enables allowing independent control of four-output groups
• CMOS construction ensuring low power dissipation and high noise immunity
• Input protection circuits designed against static discharge and transient excess voltage

Applications

• Memory address drivers in digital systems
• Carry propagation in high-speed counting applications
• Clock drivers for bus-oriented architectures

Procurement Notes

Verify the specific suffix TTR corresponds to the required tape-and-reel packaging format. Confirm that the HCT logic family voltage compatibility meets the system's 5 V requirements. Ensure the TSSOP-20 package dimensions align with the PCB footprint design. Check for RoHS compliance status as indicated in official documentation.

Selection Notes

Select this component when interfacing between 5 V TTL-compatible logic and CMOS buses. The HCT series ensures voltage level compatibility with standard TTL inputs. Consider the dual-enable structure for flexible bus management. Verify thermal performance within the specified operating temperature range during design.

Part Context

This part is part of the M74HC/HCT244 family of octal bus buffers. It shares pinout and functional compatibility with other manufacturers' 74HC244 and 74HCT244 devices. The TTR suffix indicates surface-mount packaging suitable for automated assembly processes.

Replacement Considerations

Direct substitutes include MC74HCT244ADWG from onsemi and CD74HCT244M from Texas Instruments. These alternatives maintain identical pinouts and logical functions.