DM74ALS5245WMX

Overview

The DM74ALS5245WMX is an octal bus transceiver from the Advanced Low-power Schottky (ALS) logic family, manufactured by onsemi. It features a 20-lead Small Outline Integrated Circuit (SOIC) package with JEDEC MS-013 dimensions. The device operates within a supply voltage range of 4.5V to 5.5V and supports a free-air operating temperature range of 0°C to +70°C. Key electrical parameters include a propagation delay time of 3ns to 10ns, a low-level output current of 24mA, and a high-level output current of -15mA.

Feature Summary

• Provides asynchronous two-way communication between data buses via direction control inputs.
• Incorporates input hysteresis to improve noise rejection and ensure signal integrity.
• Features PNP inputs designed to reduce input loading on driving circuits.
• Outputs enter a high impedance mode when disabled to effectively isolate buses.

Applications

• Asynchronous bidirectional data buses
• Memory systems
• Microprocessor systems

Procurement Notes

Verify that the specific ordering code matches the required package type, as the suffix indicates the physical form factor. Confirm RoHS compliance status for environmental regulations. Check for obsolescence notices or lifecycle changes directly from the manufacturer before finalizing procurement plans.

Selection Notes

Select this component for designs requiring octal data transfer with controlled directionality. Ensure the system environment stays within the specified 0°C to +70°C operating range. Verify that the ALS logic family voltage levels align with the rest of the circuit's TTL compatibility requirements.

Part Context

This device belongs to the Fairchild Semiconductor DM74ALS series, which utilizes an advanced oxide-isolated, ion-implanted Schottky process. The product line is engineered for high-speed digital applications while maintaining lower power consumption compared to standard TTL logic families.

Replacement Considerations

Direct substitutes include the SN74ALS5245DW from Texas Instruments. Verify pinout compatibility and electrical specifications against the original datasheet before implementing any cross-manufacturer replacement in existing designs.

FAQ

How does the device handle bus isolation?

The outputs enter a high impedance mode when the enable input (G) is set to a HIGH logic level, effectively isolating the A and B buses from each other.

What is the function of the DIR input?

The direction control (DIR) input determines the transmission path. A LOW logic level directs data from the A bus to the B bus, while a HIGH logic level directs data from the B bus to the A bus.