74LVCH244AQ20-13

Overview

The 74LVCH244AQ20-13 is an octal buffer and line driver manufactured by Diodes Incorporated. It operates within a supply voltage range of 1.65V to 3.6V. The device features two independent 4-bit buffers with separate output-enable inputs. It supports partial power-down applications through I_OFF circuitry, which disables outputs to prevent damaging backflow current when the device is powered down. Inputs are tolerant to 5.5V, allowing compatibility in mixed-voltage environments.

Feature Summary

• Provides bus hold circuitry to maintain unused or un-driven inputs at a stable logic state without requiring external resistors.
• Features Schmitt trigger action at all inputs to ensure clean signal transitions.
• Includes dedicated I_OFF circuitry that actively prevents damaging current backflow during partial power-down states.
• Offers high electrostatic discharge protection exceeding specified thresholds for machine model, human body model, and charged device model testing.

Applications

• Bus driving
• Power down signal isolation
• General purpose logic

Procurement Notes

Verify the package code Q20 corresponds to the V-QFN4525-20 configuration before procurement. Confirm the -13 suffix indicates the standard 13-inch tape and reel packing format. Ensure the design accommodates the specific thermal resistance characteristics associated with this surface-mount package type.

Selection Notes

Select this component for designs requiring octal buffering with mixed-voltage input tolerance up to 5.5V. The integrated bus hold feature simplifies schematic design by eliminating the need for external pull-up or pull-down resistors on floating inputs. Verify that the operating temperature range meets the system requirements.

Part Context

This part belongs to the 74LVCH244A series of octal buffers and line drivers. It utilizes CMOS technology designed for low power consumption while maintaining high-speed performance. The device is fully lead-free and RoHS compliant, meeting environmental directives for electronic components.

Replacement Considerations

Direct substitutes include the 74LVCH244AT20-13 from Diodes Incorporated, which shares identical electrical specifications but utilizes a TSSOP-20 package instead of the QFN-20 form factor.

FAQ

How does the device handle inputs when it is in a powered-down state?

The device incorporates I_OFF circuitry that disables the outputs to prevent damaging current backflow into the power supply lines when the device is not powered.

Is it necessary to add external resistors to the inputs?

No, the device includes built-in bus hold circuitry that holds unused or un-driven inputs at a defined high or low logic state, making external resistors unnecessary.