SN74CBT3245ADBQR

Overview

The SN74CBT3245ADBQR is an octal FET bus switch manufactured by Texas Instruments, housed in a 20-pin SSOP package. It operates within a supply voltage range of 4 V to 5.5 V and supports an operating temperature from -40°C to 85°C. The device provides eight bits of high-speed TTL-compatible bus switching with a standard '245-type pinout. Key electrical characteristics include a maximum on-state resistance of 15 Ω at VCC = 5 V and a propagation delay of 0.25 ns at VCC = 5 V.

Feature Summary

• Provides bidirectional data transfer between Port A and Port B when the output-enable input is low.
• Features TTL-compatible input levels for direct interfacing with standard logic systems.
• Ensures a high-impedance state between ports when the output-enable input is high.

Applications

• High-speed data bus switching applications
• TTL-to-CMOS level translation circuits
• Portable equipment requiring low power consumption

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and moisture sensitivity level. Ensure that all unused control inputs are tied to VCC or GND during operation to maintain proper device functionality and prevent undefined states.

Selection Notes

Select this component for designs requiring an octal bus switch with a standard '245 pinout configuration. It is suitable for applications needing low on-state resistance and fast propagation delays within a 4 V to 5.5 V supply range. Verify thermal requirements based on the SSOP package specifications.

Part Context

This part belongs to the SN74CBT3245A family of octal FET bus switches. It shares functional similarities with other devices in the series but is distinguished by its specific SSOP package and lead finish options. The family is designed for high-speed switching with minimal signal distortion.

Replacement Considerations

SN74CBT3245ADBR

FAQ

How does the OE pin control the switch state?

When the OE pin is low, the switch connects Port A to Port B. When the OE pin is high, the switch disconnects the ports, resulting in a high-impedance state.

What is the recommended handling for unused control inputs?

All unused control inputs must be held at VCC or GND to ensure proper device operation and avoid floating states.