SN74CBT3245AGQNR

Overview

The SN74CBT3245AGQNR is an octal FET bus switch manufactured by Texas Instruments, housed in a 20-pin VFBGA (GQN) 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 bidirectional data transmission with a maximum on-state resistance of 15 Ω at VCC = 5 V. Propagation delay is specified at 0.25 ns under typical conditions. Control inputs are TTL-compatible, requiring a high-level voltage of 2 V minimum and a low-level voltage of 0.8 V maximum.

Feature Summary

• Provides eight bits of high-speed bidirectional bus switching between port A and port B.
• Features low on-state resistance for minimal propagation delay during signal transmission.
• Includes TTL-compatible input levels for straightforward logic interfacing.
• Ensures high-impedance state when the output-enable input is held high.

Applications

• High-speed data bus switching applications
• Bidirectional level shifting between different voltage domains
• Portable equipment utilizing low-voltage power supplies

Procurement Notes

Verify the GQN package designation matches the required footprint. Confirm the suffix indicates tape and reel packaging. Ensure the component meets RoHS compliance standards if required by the assembly process. Check that the operating temperature range aligns with the environmental specifications of the final system design.

Selection Notes

Select this component for designs requiring an octal bus switch with standard '245 pinout compatibility. Consider the VFBGA package for space-constrained layouts. Verify that the 4 V to 5.5 V supply range suits the system power rails. Evaluate the thermal performance requirements associated with the specific package type.

Part Context

This part belongs to the SN74CBT3245A family of octal FET bus switches. It shares functional characteristics with other variants in the series, differing primarily in package style and manufacturing revision. The GQN suffix specifically identifies the VFBGA package configuration used for surface-mount assembly.

Replacement Considerations

SN74CBT3245ADBR

FAQ

How does the OE input control the switch state?

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

What is the recommended method to ensure high-impedance during power-up?

To ensure the high-impedance state during power up or power down, the OE input should be tied to VCC through a pullup resistor.