74LCXH2245MTCX

Overview

The onsemi 74LCXH2245MTCX is an octal bidirectional transceiver in a 20-lead TSSOP package. It operates within a supply voltage range of 2.0V to 3.6V and supports data rates up to 10MHz. The device features non-inverting buffers with three-state outputs, active bushold circuitry on all inputs, and integrated series resistors on the B port outputs. Propagation delay is specified at a maximum of 9.8ns at 3.3V. Output drive capabilities vary by voltage, reaching up to 24mA for A ports and 12mA for B ports.

Feature Summary

• Active bushold circuitry eliminates the need for external pull-up or pull-down resistors on unused or floating data inputs.
• Integrated series resistors on the B port outputs reduce output overshoot and undershoot for improved signal integrity.
• Control inputs are 5V tolerant, allowing safe interfacing with higher voltage logic systems while operating at lower core voltages.

Applications

• Bus-oriented applications requiring bidirectional data transfer
• Low voltage (2.5V and 3.3V) system interconnects
• High impedance state bus isolation

Procurement Notes

Verify that the specific ordering code includes the 'X' suffix to confirm tape and reel packaging availability. Confirm RoHS compliance status against JEDEC J-STD-020B standards. Ensure the component matches the MTC20 package number for the 20-lead Thin Shrink Small Outline Package. Check for any product change notices regarding assembly material or mold compound updates.

Selection Notes

Select this component when designing low-voltage bus architectures requiring high-speed bidirectional data flow. The inclusion of bushold inputs simplifies board layout by removing external resistor requirements. Verify that the required output drive current aligns with the specific voltage operating conditions defined in the DC electrical characteristics table.

Part Context

This part belongs to the LCXH family of low-voltage bidirectional transceivers. It utilizes advanced CMOS technology to achieve high-speed operation while maintaining low power dissipation. The device is designed specifically for bus-oriented applications where data direction control and high-impedance states are critical for system management.

Replacement Considerations

Public confirmed substitute part numbers include MC74LCX245DWG and MC74LCX245DWR2G from onsemi.

FAQ

What is the function of the OE input?

The OE (Output Enable) input disables both the A and B ports by placing them in a high-impedance state when set to a high logic level.

How does the T/R input determine data flow?

When the T/R input is low, data flows from Bus B to Bus A. When the T/R input is high, data flows from Bus A to Bus B.