MC74ACT125MELG

Overview

The MC74ACT125MELG is a quad 3-state buffer manufactured by onsemi, utilizing high-performance silicon-gate CMOS technology. It operates within a supply voltage range of 4.5 V to 5.5 V and features TTL-compatible inputs. The device provides four non-inverting buffers with individual low-level enable inputs. Key electrical characteristics include a maximum propagation delay of 10 ns at 5.0 V, output current capabilities of ±24 mA, and a maximum quiescent supply current of 80 µA. It is housed in a TSSOP-14 package.

Feature Summary

• Features TTL-compatible inputs for direct interfacing with TTL logic systems.
• Provides four independent non-inverting buffers with individual low-active enable controls.
• Delivers high drive capability with ±24 mA source and sink output currents.

Applications

• High-speed data bus buffering
• Clock signal distribution
• Memory address/data line drivers

Procurement Notes

Verify the specific ordering suffix 'MELG' against official documentation, as standard datasheets list 'DG', 'DR2G', and 'DTR2G'. Confirm package type and availability directly with the manufacturer or authorized distributors, as suffix variations may indicate distinct manufacturing runs or obsolete status not explicitly detailed in the general product overview.

Selection Notes

Select this component when interfacing between 5V CMOS logic and TTL-compatible devices requiring high drive strength. Ensure the application environment stays within the -40°C to +85°C operating temperature range. Verify that the required propagation delay and output current specifications align with the system's timing and load requirements.

Part Context

This part belongs to the MC74AC125/MC74ACT125 family of quad 3-state buffers. The 'ACT' designation specifically denotes compatibility with TTL input voltage thresholds while maintaining CMOS noise immunity and power efficiency. The device is designed for applications requiring robust signal integrity and controlled bus transitions.

Replacement Considerations

MC74ACT125DTR2G (TSSOP-14), MC74ACT125DR2G (SOIC-14), MC74ACT125DG (SOIC-14). Verify pinout and electrical parameters match before substitution.

FAQ

What is the function of the enable inputs?

The enable inputs are active-low. When low, the corresponding buffer output is enabled and follows the input state. When high, the output enters a high-impedance state.

How does the ACT series differ from the AC series?

The ACT series features TTL-compatible input voltage thresholds, allowing direct interface with TTL logic, whereas the AC series uses standard CMOS thresholds.