74LCXH16245GX

Overview

The onsemi 74LCXH16245GX is a low voltage 16-bit bidirectional transceiver with bus hold functionality. It operates within a supply voltage range of 2.0V to 3.6V and features non-inverting buffers with three-state outputs. The device supports byte-controlled operation via separate control inputs for each byte, allowing full 16-bit configuration when shorted. It includes active bus hold circuitry to maintain valid logic levels on floating inputs without external resistors. Packaged in a 54-ball Fine-Pitch Ball Grid Array (FBGA), it offers propagation delays as low as 4.5 ns at 3.3V and output drive currents up to 24 mA.

Feature Summary

• Active bus hold circuitry eliminates the need for external pull-up or pull-down resistors on unused or floating data inputs.
• Byte-controlled architecture allows independent management of two 8-bit sections or combined 16-bit operation.
• Patented noise and EMI reduction circuitry ensures signal integrity during high-speed transitions.
• Power-down mode maintains high-impedance outputs to minimize leakage current.

Applications

• Bus-oriented applications requiring bidirectional data transfer between low-voltage and 5V environments.
• Memory interface circuits utilizing byte-selectable data paths.
• High-density digital systems where board space is limited by the compact FBGA package.

Procurement Notes

Verify that the 'G' suffix corresponds to tray packaging as specified in the datasheet ordering notes. Confirm the specific package variant matches the required footprint, as the LCXH16245 series is also available in TSSOP formats. Ensure compatibility with the target operating temperature range of -40°C to +85°C before finalizing procurement specifications.

Selection Notes

Select this component for designs requiring robust bus holding capabilities without additional passive components. The device is suitable for interfaces bridging 2.5V/3.3V logic domains with 5V tolerant environments. Consider the FBGA package constraints regarding thermal dissipation and soldering profiles compared to the TSSOP alternative if board layout flexibility is a priority.

Part Context

This part belongs to the LCX family of low-voltage CMOS logic devices manufactured originally by Fairchild Semiconductor and now distributed by onsemi. The LCXH series specifically enhances standard LCX parts with patented noise reduction features. The 16245 designation identifies it as a 16-bit bidirectional transceiver within this logical hierarchy.

Replacement Considerations

The 74LCX16245MTDX is listed as a similar replacement option from onsemi. Verify pinout compatibility and electrical characteristics against the original datasheet requirements before substitution.

FAQ

How does the bus hold feature function internally?

The device incorporates active circuitry that sources or sinks small currents to maintain floating inputs at a valid logic level, removing the necessity for external pull-up or pull-down resistors.

Can the device operate with mixed voltage inputs?

Yes, the LCXH16245 is designed to interface with a 5V signal environment while operating on lower supply voltages such as 2.5V or 3.3V.