DM74ALS125N

Overview

The DM74ALS125N is a quad 3-state buffer manufactured by onsemi, utilizing an advanced low power oxide-isolated ion-implanted Schottky TTL process. It contains four independent non-inverting gates with outputs featuring 3-state capability to prevent bus contention during power-up and power-down. The device operates within a supply voltage range of 4.5V to 5.5V and supports a low-level drive current of 24 mA. Propagation delays are specified between 0 ns and 31 ns at 50 pF load. It is housed in a 14-lead Plastic Dual-In-Line Package (PDIP) suitable for through-hole mounting.

Feature Summary

• Contains four independent non-inverting buffer gates with 3-state output capability
• Maintains high impedance state during power supply ramp-up or ramp-down to eliminate bus glitching
• Disable time is shorter than enable time to minimize simultaneous bus contention
• PNP input design reduces input loading compared to standard TTL

Applications

• Bus-oriented memory and signal driving applications
• Clock drivers and buffered clock distribution
• Data register output buffering

Procurement Notes

Verify the manufacturer origin as Fairchild Semiconductor was acquired by onsemi; confirm package type N14A corresponds to the required 14-pin DIP footprint. Ensure the specific revision matches the datasheet DS010620 if legacy compatibility is critical. Check RoHS compliance status for the specific manufacturing lot as historical production may vary in material composition requirements.

Selection Notes

Select this component when a quad non-inverting buffer with controlled 3-state timing is required. It serves as a functional and pin-compatible alternative to the 74LS125 series while offering improved switching speeds and lower power consumption due to the ALS process. Verify that the 24 mA low-level output current meets the load requirements of the destination circuitry.

Part Context

This part belongs to the 74ALS logic family, characterized by advanced low-power Schottky technology. It provides performance improvements over the standard 74LS series while maintaining pin compatibility. The DM74ALS125N specifically addresses bus management needs in digital systems requiring multiple buffered outputs with tri-state control capabilities.

Replacement Considerations

SN74ALS125N from Texas Instruments is a direct substitute.