SN74BCT540ANS

Buffers, Drivers, Receivers, Transceivers Overview

The SN74BCT540AN is an octal buffer and line driver featuring three-state outputs, manufactured using state-of-the-art BiCMOS technology. It operates within a supply voltage range of 4.5 V to 5.5 V. The device provides eight input lines and eight output lines with inverting polarity. Key electrical characteristics include a high-level output current of -15 mA and a low-level output current of 64 mA at 5 V. Propagation delay is specified as 5.8 ns maximum at 5 V with a 50 pF load. It functions within a temperature range of 0°C to +70°C and utilizes a 20-pin PDIP package.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• State-of-the-art BiCMOS design significantly reduces quiescent current consumption compared to standard TTL equivalents.
• P-N-P inputs reduce DC loading on driving circuits while maintaining compatibility with CMOS logic levels.
• Data flow-through pinout places all inputs on the opposite side from outputs to facilitate printed circuit board layout.
• ESD protection exceeds JESD 22 standards for human-body model, machine model, and charged-device model testing.

Buffers, Drivers, Receivers, Transceivers Applications

• Driving bus lines in digital systems
• Buffering memory address registers
• Interface between different logic families

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix 'N' corresponds to the PDIP-20 tube packaging configuration. Confirm that the required operating temperature range aligns with the commercial grade (0°C to +70°C) rather than military specifications. Ensure the application environment does not exceed the absolute maximum ratings for supply voltage or input clamp currents.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when high drive capability is required for bus structures. The BiCMOS technology offers a balance of speed and power efficiency suitable for 5 V systems. Consider the through-hole package constraint if surface mount alternatives are not viable for the mechanical assembly requirements.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN54/74BCT540A family of octal buffers. It is distinct from the SN74LS540 due to lower power consumption and higher drive strength. It differs from the SN74AHCT540 by its specific BiCMOS architecture and 5 V-only operation range.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74BCT540ADW (SOIC package)

Buffers, Drivers, Receivers, Transceivers FAQ

How are the output enable pins configured?

The device features two active-low output-enable inputs (OE1 and OE2). If either input is high, all corresponding outputs enter a high-impedance state.

What is the recommended handling for unused inputs during power-up?

To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor.