DM74ALS245ASJX

Overview

The DM74ALS245ASJX is an octal 3-STATE bus transceiver manufactured by onsemi, utilizing the Advanced Low-power Schottky (ALS) logic family. 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 free air temperature range from 0°C to +70°C. Propagation delay times are specified between 0ns and 31ns, with output enable/disable times ranging from 2ns to 20ns.

Feature Summary

• Advanced oxide-isolated, ion-implanted Schottky TTL process for low power consumption
• Non-inverting logic output with glitch-free operation during power up and down
• 3-STATE outputs independently controlled on A and B buses via G and DIR inputs
• Low output impedance capable of driving terminated transmission lines

Applications

• Memory systems
• Microprocessor systems
• Asynchronous bidirectional data buses

Procurement Notes

Verify that the ordering code matches the specific SOP package configuration. Confirm the presence of the 'X' suffix if tape and reel packaging is required. Ensure compatibility with the recommended operating conditions regarding supply voltage and ambient temperature ranges before finalizing procurement.

Selection Notes

Select this component when designing circuits requiring non-inverting octal bus transceivers with 3-STATE outputs. Consider its capability to interface with CMOS devices at VOH = VCC − 2V. Evaluate the switching response specifications into 500Ω / 50 pF loads to ensure signal integrity in high-speed applications.

Part Context

This device belongs to the 74ALS series of logic integrated circuits. It is functionally equivalent to other octal bus transceivers within the same logic family, providing bidirectional data transfer capabilities. The SOP package variant offers a compact footprint suitable for surface-mount assembly in space-constrained electronic designs.

Replacement Considerations

SN74ALS245A-1N

FAQ

How is the direction of data transmission controlled?

Two-way communication between buses is controlled by the DIR input. Data transmits from the A bus to the B bus or vice versa based on the logic level applied to this pin.

What happens when the G enable input is HIGH?

When the G enable input is HIGH, both the driver and receiver outputs enter the high impedance mode, effectively isolating the buses.