M74HCT245TTR

Overview

The M74HCT245TTR 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. The component operates within a supply voltage range of 4.5V to 5.5V and supports an operating temperature from -55°C to +125°C. Key electrical characteristics include a typical propagation delay of 13ns at 4.5V, a maximum quiescent supply current of 4μA, and symmetrical output impedance with minimum drive currents of 6mA.

Feature Summary

• Provides bidirectional data transfer capability for asynchronous communication between two separate data buses.
• Features three-state outputs that allow effective isolation of buses when the device is disabled.
• Includes protection circuits on all inputs against static discharge and transient excess voltage.
• Maintains pin and function compatibility with standard 74 series 245 devices.

Applications

• Two-way asynchronous communication between data buses
• Bus-oriented memory and command decoding applications
• Clock drivers and buffered oscillators

Procurement Notes

Verify the specific ordering code suffix to confirm the TSSOP-20 package configuration. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure design specifications align with the recommended operating conditions, specifically the 4.5V to 5.5V supply voltage range. Validate thermal management requirements against the absolute maximum power dissipation ratings for the target application environment.

Selection Notes

Select this component for designs requiring robust bidirectional data transfer with defined direction control. The HCT logic level ensures compatibility with TTL outputs, simplifying interface design with legacy systems. Consider the low power dissipation and high speed characteristics for battery-operated or high-frequency applications. Verify that the required number of channels matches the eight available in this octal configuration.

Part Context

This part belongs to the M74HCT245 family of octal bus transceivers manufactured by STMicroelectronics. It utilizes advanced high-speed CMOS technology to deliver performance comparable to bipolar devices while maintaining low power consumption. The TSSOP-20 package variant offers a compact surface-mount solution suitable for space-constrained printed circuit board layouts.

Replacement Considerations

Direct replacements must match the octal bus transceiver functionality, three-state output capability, and HCT logic compatibility. Verify pinout correspondence and electrical parameters such as propagation delay and supply voltage range. Consult manufacturer cross-reference lists for equivalent parts from other vendors offering identical functional specifications.