DM74ALS240ASJX

Overview

The DM74ALS240ASJX is an octal 3-STATE bus driver manufactured by onsemi, utilizing the Advanced Low Power Schottky (ALS) process. It features a 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm wide. The device operates within a supply voltage range of 4.5V to 5.5V and supports an operating temperature range of 0°C to +70°C. Electrical characteristics include a low level output current of 24mA and a high level output current of -15mA. Propagation delay times are specified between 2ns and 11ns depending on the transition direction.

Feature Summary

• Octal 3-STATE bus drivers designed for memory, microprocessor, or communication systems
• Advanced oxide-isolated ion-implanted Schottky TTL process
• Functional and pin compatible with the DM74LS counterpart
• Maintains buffer outputs in 3-STATE during power supply ramp-up or ramp-down

Applications

• Memory system interfaces
• Microprocessor system buses
• Communication system data lines

Procurement Notes

Verify component authenticity through authorized distributors or official manufacturer channels. Confirm package type matches the SOP M20D specification. Check datasheet revision history for updates. Ensure environmental compliance requirements align with project specifications. Validate that the specific ordering suffix corresponds to the required packaging format.

Selection Notes

Select this component when designing systems requiring octal buffering with 3-STATE control. Consider its compatibility with LS logic families if legacy interface support is needed. Evaluate power dissipation requirements against the ALS process capabilities. Verify that the SOP package dimensions fit the target PCB layout constraints.

Part Context

This part belongs to the DM74ALS240A/241A family of Octal 3-STATE Bus Drivers. The 'A' suffix typically denotes improved specifications over earlier versions. The 'S' indicates the SOP package style, while 'JX' specifies the tape and reel packaging variant. This series provides flexibility in implementing bidirectional or unidirectional bus interfaces.

Replacement Considerations

SN74ALS240AN Texas Instruments

FAQ

How does the DM74ALS240A handle power-up and power-down conditions?

The 3-STATE circuitry maintains the buffer outputs in a high impedance state during power supply ramp-up or ramp-down, eliminating bus glitching problems.

What is the organization of the 3-STATE gating control?

The control inputs are organized into two separate groups of four buffers, symmetrically enabling the respective outputs when set logic LOW.