74LCXH2245MTC

Overview

The onsemi 74LCXH2245MTC is a low voltage bidirectional transceiver in a 20-lead Thin Shrink Small Outline Package (TSSOP). It contains eight non-inverting buffers with 3-STATE outputs. The device operates within a supply voltage range of 2.0V to 3.6V and supports data rates up to 10MHz. Propagation delay is specified at 7.0ns maximum for VCC at 3.3V. Output drive capabilities vary by port, providing up to 24mA on Port A and 12mA on Port B under specific conditions.

Feature Summary

• Features active bushold circuitry on inputs to maintain valid logic levels without external pull-up or pull-down resistors.
• Incorporates equivalent series resistors in the B Port outputs to reduce overshoot and undershoot.
• Provides 5V tolerant control inputs while operating at lower core voltages.
• Delivers power down high impedance outputs when disabled.

Applications

• Bus-oriented applications requiring bidirectional data flow
• Low voltage memory bus interfaces
• High density microcontroller systems

Procurement Notes

Verify package designation MTC20 corresponds to the 20-lead TSSOP form factor. Confirm RoHS compliance status as per JEDEC J-STD-020B standards. Ensure ESD handling protocols are followed given the CMOS fabrication technology. Check datasheet revisions for any updates to electrical characteristics or ordering information.

Selection Notes

Select this component for designs requiring bidirectional buffering with integrated noise reduction features. The bushold function simplifies input handling for unused lines. Verify that the required output current aligns with the 12mA limit on Port B if driving heavy loads. Consider the 2.0V minimum operating voltage for compatibility with low power logic families.

Part Context

This part belongs to the LCXH family of low voltage CMOS logic devices. It is manufactured using advanced CMOS technology to achieve high speed operation with low power dissipation. The device is designed specifically for 2.5V and 3.3V VCC applications, distinguishing it from standard 5V logic families.

Replacement Considerations

Equivalent parts include the 74LCX245 and 74LVC245. Verify pinout compatibility and check if bushhold functionality is required. Compare propagation delays and output drive strengths against system requirements before substitution.

FAQ

What is the purpose of the bushhold feature?

Bushhold eliminates the need for external pull-up or pull-down resistors by holding unused or floating data inputs at a valid logic level.

How does the B Port differ from the A Port?

The B Port includes an equivalent 26/58 ohm series resistor to reduce signal reflections, whereas the A Port does not have this internal resistance.