M74HC245TTR

Overview

The M74HC245TTR is an advanced high-speed CMOS octal bus transceiver with three-state outputs, fabricated using silicon gate C2MOS technology. It facilitates two-way asynchronous communication between data buses, with transmission direction controlled by the DIR input and device enablement managed by the G input to isolate buses. The component operates within a wide voltage range of 2V to 6V, featuring symmetrical output impedance and balanced propagation delays. It includes protection circuits against static discharge and transient excess voltage on all inputs.

Feature Summary

• Octal bus transceiver with non-inverted three-state outputs
• Directional control via DIR input for asynchronous communication
• High noise immunity with VNIH = VNIL = 28% VCC minimum
• Symmetrical output impedance ensuring |IOH| = IOL

Applications

• Two-way asynchronous communication between data buses
• System isolation through effective bus disabling
• General-purpose digital logic interfacing

Procurement Notes

Verify that the ordering code matches the specific package type required, as the M74HC245TTR designation corresponds to the TSSOP-20 package in tube or tape-and-reel configurations. Confirm supply voltage requirements align with the 2V to 6V operating range. Ensure ESD handling protocols are followed due to the CMOS construction. Cross-reference pin assignments with the official STMicroelectronics datasheet to guarantee correct integration into the target circuit design.

Selection Notes

Select this component when an octal bidirectional interface with three-state capability is required. It is suitable for applications needing wide operating voltage flexibility and high noise immunity. Consider the TSSOP-20 package for surface-mount designs requiring compact footprints. Verify that the propagation delay characteristics meet the timing constraints of the system architecture.

Part Context

This device belongs to the M74HC series of high-speed CMOS logic components manufactured by STMicroelectronics. It maintains pin and function compatibility with the standard 74HC245 series, allowing for direct replacement in existing designs. The technology utilizes silicon gate C2MOS processes to achieve low power dissipation while maintaining high speed performance typical of HC logic families.

Replacement Considerations

Compatible replacements include other manufacturers' 74HC245 variants that adhere to JEDEC standards. Ensure substitute parts maintain the same 20-pin configuration and logical functionality. Verify that alternative sources offer equivalent electrical specifications regarding propagation delay and output drive current.