SN74AS805BDWR

Overview

The SN74AS805BDWR is a hex 2-input NOR gate from the Texas Instruments AS-TTL series, housed in a 20-pin SOIC (DW) package. It operates on a 4.5V to 5.5V supply voltage and supports a commercial temperature range of 0°C to 70°C. The device features high capacitive-drive capability with typical propagation delays of 1ns to 4.3ns at a 50pF load. Output currents reach up to 48mA low-level and -48mA high-level, while power dissipation per gate is typically 12mW.

Feature Summary

• Contains six independent 2-input NOR logic drivers
• Provides high capacitive-drive capability for demanding loads
• Features ultra-fast switching speeds within the AS-TTL family

Applications

• High-speed digital logic processing
• Memory address decoding circuits
• Bus control logic implementation

Procurement Notes

Verify that the ordering suffix 'DWR' corresponds to the SOIC-20 tape-and-reel packaging configuration. Confirm the specific revision level matches the design requirements, as datasheet revisions may update electrical characteristics or pinout details. Ensure compliance with RoHS directives if applicable to the manufacturing batch.

Selection Notes

Select this component when high-speed NOR logic is required alongside significant drive strength. The AS-TTL technology offers faster performance than standard TTL but consumes more power than ALS variants. Verify that the 20-pin surface-mount footprint fits the PCB layout constraints and that the operating temperature range aligns with the system environment.

Part Context

This part belongs to the SN54/74AS series of advanced Schottky TTL logic devices. The 'SN74' prefix indicates commercial temperature rating, while 'AS' denotes the Advanced Schottky technology family known for speed. The '805' function code specifically identifies the hex 2-input NOR gate configuration within the broader logic catalog.

Replacement Considerations

The SN74ALS805A serves as a lower-power alternative within the same functional category. Cross-reference pinouts and electrical limits carefully, as ALS devices offer different drive strengths and propagation delays compared to the AS series.