74LVC244ATTR

Overview

The 74LVC244ATTR is a low voltage CMOS octal bus buffer with three-state outputs manufactured by STMicroelectronics. It operates within a supply voltage range of 1.65V to 3.6V and features 5V tolerant inputs, allowing interface with mixed 3.3V/5V systems. The device provides symmetrical output impedance with a minimum drive current of 24mA at 3.0V. Propagation delay is specified as a maximum of 5.9ns at VCC = 3V. It includes power-down protection on inputs and outputs, balanced propagation delays, and latch-up performance exceeding 500mA per JESD 17 standards.

Feature Summary

• Octal bus buffer architecture with three-state outputs controlled by two separate enable inputs
• 5V tolerant inputs enabling direct interfacing between 3.3V and 5V logic environments
• Power-down protection circuits prevent leakage currents during power-off states
• High ESD immunity with HBM ratings exceeding 2000V and MM ratings exceeding 200V

Applications

• Memory address drivers in mixed voltage system architectures
• Clock buffering and distribution networks
• Bus-oriented transmissions requiring high-speed data transfer
• PCI bus level applications ensuring signal integrity at specified drive currents

Procurement Notes

Verify the specific ordering suffix 'ATTR' corresponds to the TSSOP-20 package configuration before procurement. Confirm that the component meets RoHS compliance requirements for your target assembly process. Ensure that static-sensitive handling procedures are strictly followed during storage and installation due to the CMOS technology used. Cross-reference the datasheet revision date to ensure compatibility with current design specifications.

Selection Notes

Select this component when an octal buffer with 5V input tolerance is required for low-voltage digital systems. It is suitable for designs needing high-speed performance combined with low power consumption. Consider its pin compatibility with standard 74 series devices if migrating from older logic families. Evaluate the operating temperature range against environmental constraints to ensure reliable functionality across the specified industrial limits.

Part Context

This part belongs to the 74LVC244A family of low voltage CMOS logic buffers. It utilizes sub-micron silicon gate and double-layer metal wiring C2MOS technology. The device is functionally compatible with the standard 74 series 244 but optimized for lower voltage operation. It serves as a bridge between different voltage domains while maintaining signal integrity in high-density electronic designs.

Replacement Considerations

Direct substitutes include other manufacturers' 74LVC244 variants in TSSOP-20 packages. Verify pinout compatibility and electrical characteristics such as propagation delay and drive current when selecting alternatives. Ensure that any replacement maintains the same 5V input tolerance and power-down protection features.