M74HC245B1R

Overview

The M74HC245B1R is an advanced high-speed CMOS octal bus transceiver with 3-state outputs, fabricated using silicon gate C2MOS technology. It operates within a supply voltage range of 2V to 6V and features symmetrical output impedance with minimum drive currents of 6mA for both high and low states. The device provides balanced propagation delays (tPLH ≈ tPHL) and includes protection circuits against static discharge and transient excess voltage on all inputs. It supports operating temperatures from -55°C to +125°C.

Feature Summary

• Octal bus transceiver with non-inverted 3-state outputs
• Directional control via DIR input for asynchronous communication
• Output isolation capability through the G enable input
• High noise immunity and balanced propagation delays

Applications

• Two-way asynchronous communication between data buses
• Signal buffering in digital systems requiring bidirectional transfer
• Bus expansion in microcontroller-based designs

Procurement Notes

Verify that the ordering code matches M74HC245B1R specifically for the DIP package configuration. Confirm the manufacturer is STMicroelectronics as specified in the datasheet. Ensure the component meets the required temperature range of -55°C to +125°C for your application environment. Check for any specific handling requirements related to the C2MOS fabrication process.

Selection Notes

Select this component when an octal bidirectional buffer with 3-state capability is needed. It is suitable for applications requiring wide voltage operation between 2V and 6V. Consider its high noise immunity and low power dissipation characteristics. Ensure the DIP-20 package format aligns with your PCB layout constraints.

Part Context

This part belongs to the M74HC245 series of octal bus transceivers. It is functionally compatible with the standard 74HC245 logic family but manufactured by STMicroelectronics using their specific C2MOS technology. The 'B1R' suffix indicates the DIP-20 package variant.

Replacement Considerations

Compatible substitutes include generic 74HC245 devices from other manufacturers such as NXP or ON Semiconductor, provided they meet the same electrical specifications and pinout compatibility.