SN74CBTLV3245DBR

Overview

The SN74CBTLV3245DBR is a low-voltage octal FET bus switch manufactured by Texas Instruments. It provides eight bits of high-speed bidirectional data switching in a standard '245 pinout configuration within a 20-pin shrink small-outline (DB) package. The device operates with a supply voltage range of 2.3 V to 3.6 V and supports an operating temperature range from -40°C to +85°C. Key electrical characteristics include a typical on-state resistance of 5 Ω at VCC = 3 V, a maximum propagation delay of 0.25 ns at VCC = 3.3 V, and a maximum quiescent current of 20 μA.

Feature Summary

• Provides eight bits of high-speed bidirectional bus switching in a standard '245 pinout.
• Features low on-state resistance for minimal signal propagation delay.
• Ensures isolation under power-off conditions to prevent interference.
• Includes ESD protection exceeding 2000 V per MIL-STD-883, Method 3015.

Applications

• High-speed data bus routing
• Portable equipment
• Consumer electronics

Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest documentation to confirm package type and environmental compliance. Ensure that design parameters align with the recommended operating conditions, specifically the 2.3 V to 3.6 V supply voltage range. Confirm that the input control logic levels are compatible with the system voltage to guarantee proper enable and disable functionality during operation.

Selection Notes

Select this component when a low-voltage, high-speed octal bus switch is required in a compact surface-mount package. The device is suitable for applications needing bidirectional data transfer with minimal insertion loss. Consider the 5 Ω on-state resistance and sub-nanosecond propagation delay for high-frequency signal integrity requirements within the specified voltage and temperature ranges.

Part Context

This part belongs to the SN74CBTLV3245 family of low-voltage octal FET bus switches. The 'DB' suffix indicates the 20-pin shrink small-outline package variant. The series is designed to replace higher-voltage counterparts in modern low-power systems, offering improved speed and lower power consumption while maintaining compatibility with standard bus architectures.

Replacement Considerations

Direct replacements must match the 2.3 V to 3.6 V operating voltage and 20-pin SSOP footprint. Verify that substitute components offer comparable on-state resistance and propagation delay specifications to maintain signal integrity in high-speed bus applications.

FAQ

How does the device handle power-down conditions?

The SN74CBTLV3245 provides isolation under power-off conditions, ensuring that the switch remains open and prevents current leakage between ports when the supply voltage is absent.

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

To ensure the high-impedance state during power up or power down, the output enable (OE) pin should be tied to VCC through a pullup resistor, with the minimum value determined by the current-sinking capability of the driver.