DM74ALS125MX

Overview

The DM74ALS125MX is a quad 3-state buffer manufactured by onsemi, utilizing the Advanced Low-power Schottky (ALS) logic family. It operates within a supply voltage range of 4.5V to 5.5V and supports an operating temperature range of 0°C to +70°C. The device features four independent non-inverting buffers with high-level output current of -15mA and low-level output current of 24mA. Propagation delays are specified at 31ns maximum for LOW-to-HIGH transitions and 21ns maximum for HIGH-to-LOW transitions under standard load conditions.

Feature Summary

• Contains four independent non-inverting buffer gates with 3-state output capability
• Maintains outputs in high impedance state during power supply ramp-up or ramp-down to eliminate bus glitching
• Disable time is shorter than enable time to prevent common bus contention between opposing logic levels
• Utilizes PNP input design to reduce input loading

Applications

• Bus-oriented communications systems requiring tri-state isolation
• Clock distribution circuits where glitch-free power sequencing is required
• Data acquisition systems utilizing buffered signal paths
• Memory address drivers for bidirectional data buses

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm package marking matches SOIC-14 specifications. Check datasheet revisions for updates regarding electrical characteristics. Ensure storage conditions comply with moisture sensitivity level requirements prior to soldering.

Selection Notes

Select this component when designing systems requiring quad buffering with controlled bus release timing. The ALS technology offers faster switching speeds compared to standard LS logic while maintaining lower power consumption. Verify that the 24mA low-level drive current meets the sink requirements of the connected loads.

Part Context

This part belongs to the 74ALS series of logic integrated circuits, representing an evolution from standard TTL technologies. The 'M' suffix indicates the 14-lead Small Outline Integrated Circuit (SOIC) package variant. The device is functionally compatible with the 74LS125 counterpart but provides improved performance metrics.

Replacement Considerations

• SN74ALS125DR (Texas Instruments)
• SN74ALS125NSR (Texas Instruments)

FAQ

How does the device handle power-up sequences?

The internal circuitry maintains the buffer outputs in a high-impedance state during power supply ramp-up or ramp-down, effectively eliminating bus glitching problems associated with power transitions.

What is the specific advantage of the disable time relative to the enable time?

The disable time is designed to be shorter than the enable time. This timing characteristic minimizes the possibility of two outputs attempting to drive a common bus to opposite logic levels simultaneously.