SN74CBT3257DBR

Overview

The SN74CBT3257DBR is a 4-bit 1-of-2 FET multiplexer/demultiplexer from the CBT logic series. It operates within a supply voltage range of 4 V to 5.5 V and supports an operating temperature range of -40°C to +85°C. The device features TTL-compatible input levels and utilizes an SSOP-16 package. Key electrical characteristics include a typical on-state resistance (ron) of 14 Ω at VCC = 4 V and propagation delay (tpd) ranging from 0.25 ns to 0.35 ns depending on supply voltage.

Feature Summary

• High-speed switching with low on-state resistance for minimal propagation delay
• TTL-compatible input levels allowing direct interfacing with standard logic
• Bidirectional data flow capability between A and B ports

Applications

• Data routing in high-speed digital systems
• Signal path selection in communication equipment
• Bus exchange applications requiring fast switching

Procurement Notes

Verify the specific ordering suffix 'DBR' corresponds to the SSOP-16 tape and reel packaging configuration. Confirm that the component status aligns with current production availability, as datasheet revisions may indicate obsolescence or lifecycle changes. Ensure compatibility with the required 4 V to 5.5 V supply voltage and -40°C to +85°C operating temperature range for the target application environment.

Selection Notes

Select this component when a 4-channel bidirectional switch with TTL-compatible inputs is required. The SSOP-16 package offers a compact solution for space-constrained designs. Consider the low on-state resistance and fast propagation delays for high-frequency signal routing applications where signal integrity is critical. Ensure the design accommodates the specified supply voltage range and thermal requirements.

Part Context

The SN74CBT3257 belongs to Texas Instruments' CBT (Complementary Bipolar Technology) family, designed for high-speed analog switching applications. This specific variant, SN74CBT3257DBR, integrates four independent switches into a single 16-pin SSOP package. It serves as a core building block for multiplexing and demultiplexing functions in digital and mixed-signal circuits.

Replacement Considerations

SN74CBT3257D

FAQ

What is the function of the OE pin?

The Output Enable (OE) pin controls the state of the switches. When OE is Low, the selected B port connects to the A port based on the S input. When OE is High, all switches are disconnected.

How does the Select (S) input determine the connection?

When OE is Low, a Low level on the S input connects the A port to the B1 port, while a High level on the S input connects the A port to the B2 port.