74LCX16652MEAX

Overview

The 74LCX16652MEAX is a low-voltage transceiver and register featuring sixteen non-inverting bidirectional bus transceivers with three-state outputs. It supports multiplexed transmission of data directly from the input bus or from internal registers, clocking data into registers on HIGH logic level transitions. Designed for 2.3V to 3.6V VCC applications, it interfaces with 5V signal environments via 5V tolerant inputs and outputs. Fabricated using advanced CMOS technology, it achieves high-speed operation with low power dissipation, offering a maximum propagation delay of 5.7 ns at 3.3V and a maximum quiescent supply current of 20 µA.

Feature Summary

• Provides independent output enable control for each direction to manage transceiver functions.
• Supports live insertion and withdrawal capabilities to ensure system reliability during hot-plugging events.
• Implements patented noise and EMI reduction circuitry to enhance signal integrity in high-speed designs.

Applications

• High availability systems requiring robust thermal monitoring and fan control
• Remote thermal controllers and voltage monitors
• PC hardware monitor ASICs

Procurement Notes

Verify that the specific ordering code matches the required package type, as the device is available in both SSOP and TSSOP configurations. Confirm that the suffix 'X' indicates tape and reel packaging if automated assembly is planned. Ensure compatibility with the target operating temperature range of -40°C to +85°C. Check for any specific manufacturer revisions or lifecycle status updates prior to finalizing procurement orders.

Selection Notes

Select this component when designing systems that require interfacing between low-voltage logic domains and 5V tolerant buses. The dual-directional control allows flexible data routing between A and B buses. Consider the 56-lead SSOP package for space-constrained PCB layouts. Evaluate the low quiescent current specifications for battery-operated or power-sensitive applications requiring minimal standby power consumption.

Part Context

This device belongs to the LCX family of low-voltage CMOS logic devices. It serves as a registered bus transceiver, combining buffering and storage capabilities in a single integrated circuit. The part is manufactured by Rochester Electronics, which sources components from original manufacturers. It is distinct from standard LVC or LVX families due to its specific 5V tolerance and registered output features.

Replacement Considerations

Direct substitutes include the 74ACT16652DLG4 and 74ACT16652DLR from Texas Instruments, though these operate at different voltage levels (4.5V–5.5V). Verify pinout compatibility and electrical characteristics before swapping, as ACT series parts differ significantly in supply voltage requirements compared to the LCX series.

FAQ

How does the device handle data storage during real-time transfer?

Data can be stored in the internal D flip-flops via LOW-to-HIGH clock transitions regardless of select or output enable inputs. Alternatively, data can be stored without using flip-flops by simultaneously enabling OEABn and OEBAn, causing each output to reinforce its input.

What is the maximum quiescent supply current specified for this component?

The maximum quiescent supply current (ICC) is specified as 20 µA when the supply voltage is between 2.3V and 3.6V.