MC74HC540ADWR2G

Overview

The MC74HC540ADWR2G is an octal inverting buffer, line driver, and line receiver manufactured by onsemi. It utilizes high-performance silicon-gate CMOS technology and operates within a DC supply voltage range of 2.0 V to 6.0 V. The device features eight inputs and eight outputs with two ANDed active-low output enables (OE1, OE2). When enabled, it provides inverted data transmission; otherwise, outputs enter a high-impedance state. It is housed in a SOIC-20 wide package.

Feature Summary

• Features inputs and outputs positioned on opposite sides of the package for efficient bus-oriented system layout.
• Includes two ANDed active-low output enable pins that control the transition between driving states and high impedance.
• Designed for compatibility with standard CMOS outputs and LSTTL outputs when external pull-up resistors are utilized.

Applications

• Memory address drivers
• Clock drivers
• Bus-oriented systems

Procurement Notes

Verify the specific ordering suffix 'DW' corresponds to the SOIC-20 Wide package and 'R2G' indicates tape and reel packaging. Confirm RoHS compliance and Pb-free status requirements against current project specifications. Ensure the operating temperature range of -55°C to +125°C aligns with environmental constraints.

Selection Notes

Select this component for applications requiring octal inverting buffering with 3-state capability. Compare against the non-inverting HC541A variant if signal inversion is not required. Verify interface compatibility with downstream CMOS, NMOS, or TTL loads based on the drive capability specifications.

Part Context

This device belongs to the MC74HC540A logic series, which is functionally identical in pinout to the LS540. It is part of the broader family of octal buffers and line drivers designed for high-noise immunity and low input current characteristics typical of CMOS devices.

Replacement Considerations

MC74HC540ADW (Rail Pack)

FAQ

How do the output enable pins function?

The device has two ANDed active-low output enable pins (OE1 and OE2). Outputs are enabled only when both pins are at a low voltage level. Applying a high voltage to either pin places the outputs in a high-impedance state.

Is the device compatible with LSTTL outputs?

Yes, while inputs are compatible with Standard CMOS outputs, they can be made compatible with LSTTL outputs by using external pull-up resistors.