MC74LCX16240DTR2

Overview

The MC74LCX16240DTR2G is a low-voltage CMOS 16-bit buffer with 5 V-tolerant inputs and outputs. It operates from a 2.3 V to 3.6 V supply and features inverting, 3-state outputs controlled by four independent Output Enable (OEn) inputs for nibble control. The device provides balanced output sink and source capability of 24 mA at VCC = 3.0 V to 3.6 V. Propagation delay ranges from 1.5 ns to 5.4 ns depending on voltage and load conditions. Quiescent supply current is near zero across all logic states.

Feature Summary

• Features 5.0 V tolerant inputs and outputs allowing safe interfacing with 5.0 V TTL logic devices.
• Supports live insertion and withdrawal through an IOFF specification that guarantees high impedance when VCC is 0 V.
• Provides balanced 24 mA output drive capability for improved switching noise performance.
• Operates with LVTTL and LVCMOS compatible input levels while maintaining near zero static supply current.

Applications

• Memory address driving
• TTL level bus oriented transceiver applications
• High impedance state buffering for data lines

Procurement Notes

Verify the specific ordering suffix 'DTR2G' corresponds to the TSSOP-48 package and tape & reel shipping configuration. Confirm RoHS compliance and Pb-free status as indicated by the 'G' suffix. Ensure the procurement quantity aligns with the standard factory pack size of 2500 units per tape and reel.

Selection Notes

Select this component for designs requiring 16-bit buffering between 2.3 V to 3.6 V logic domains and 5.0 V systems. The independent OEn pins allow flexible nibble-level control without tying all enables together. Verify that the required propagation delay fits within the system timing constraints under the specific operating voltage and capacitive load conditions.

Part Context

This part belongs to the MC74LCX series of low-voltage CMOS logic devices manufactured by onsemi. It is functionally similar to other 16-bit buffers but specifically designed for 5 V tolerance and high drive current. The device replaces older 5 V only buffers in mixed-voltage systems where power consumption and signal integrity are critical.

Replacement Considerations

MC74LCX16240MTCXG

FAQ

How does the device handle live insertion?

The MC74LCX16240 supports live insertion and withdrawal due to its IOFF specification, which ensures outputs remain in a high impedance state when VCC is 0 V.

Can the Output Enable pins be used independently?

Yes, the device is nibble-controlled with four separate Output Enable inputs (OE1-OE4). These can be tied together for full 16-bit operation or used independently to control groups of four outputs.