SN74CBT3257RGYR

Overview

The SN74CBT3257RGYR is a 4-bit 1-of-2 high-speed TTL-compatible FET multiplexer/demultiplexer manufactured by Texas Instruments. It operates within a supply voltage range of 4 V to 5.5 V and supports an operating free-air temperature range from -40°C to 85°C. The device features low on-state resistance, allowing connections with minimal propagation delay. Key electrical characteristics include a typical propagation delay of 0.25 ns at 5 V and an on-state resistance (ron) ranging from 5 Ω to 20 Ω depending on current and voltage conditions.

Feature Summary

• Provides bidirectional switching between two ports using four independent channels
• Features TTL-compatible input levels for direct interfacing with standard logic families
• Utilizes output-enable (OE) and select-control (S) inputs to manage data routing

Applications

• High-speed signal routing in digital systems
• Data bus expansion and management
• Multiplexing applications requiring low insertion loss

Procurement Notes

Verify the specific package marking CU257 against the datasheet to confirm authenticity. Ensure the supply voltage does not exceed the absolute maximum rating of 7 V to prevent permanent damage. Confirm that unused control inputs are tied to VCC or GND to ensure proper operation and avoid floating states.

Selection Notes

Select this component when a 4-channel bidirectional switch with TTL compatibility is required. The RGY package offers a compact QFN form factor suitable for space-constrained designs. Verify that the load capacitance requirements align with the specified switching characteristics for optimal performance.

Part Context

This part belongs to the SN74CBT3257 family of multiplexers. It is distinct from other variants like the SN74CBTLV3257, which operates at lower voltages. The RG Y package designation indicates a Quad Flat No-Lead (QFN) configuration with specific thermal and mechanical properties defined by TI.

Replacement Considerations

Public confirmed substitute part numbers: None explicitly listed in the provided source material.