SN74CBTK16245DGGR

Overview

The SN74CBTK16245DGGR is a discontinued 16-bit FET bus switch manufactured by Texas Instruments. It features two independent 8-bit switches with separate output-enable inputs and operates within a supply voltage range of 4 V to 5.5 V. The device provides a typical on-state resistance of 5 Ω at 4 V and supports TTL-compatible input levels. It includes active-clamp undershoot-protection circuitry that clamps undershoots up to –2 V, ensuring robust signal integrity.

Feature Summary

• Features an active-clamp undershoot-protection circuit on the I/Os to clamp negative transients up to -2 V
• Supports partial-power-down mode operation through dedicated Ioff circuitry that disables outputs to prevent backflow current
• Provides low-impedance switching with a typical on-resistance of 5 Ω for minimal propagation delay
• Offers high ESD protection exceeding 2000-V human-body model and 1000-V charged-device model ratings

Applications

• Partial-power-down applications requiring safe disconnection during power loss
• High-speed TTL-compatible bus switching in standard '16245 pinout configurations
• Systems requiring active-clamp protection against signal undershoot events

Procurement Notes

This component is officially marked as obsolete by Texas Instruments. Verify availability through authorized distributors or secondary market suppliers such as Rochester Electronics. Confirm the specific manufacturing date code and package condition upon acquisition, as production has ceased and stock may be limited or subject to lifetime-buy periods.

Selection Notes

Select this part only if the standard '16245 pinout and 4 V to 5.5 V operating range are required. Ensure designs account for its obsolete status by validating long-term supply chain stability. Consider alternative active devices from the SN74CBT family if new production longevity is a priority, while verifying pin compatibility and electrical parameter alignment.

Part Context

The SN74CBTK16245DGGR belongs to the Widebus family of logic ICs from Texas Instruments. It utilizes a 48-pin TSSOP package and is designed for high-density board layouts. As a member of the CBTK series, it integrates specific K-series enhancements like the active-clamp feature, distinguishing it from standard CBT variants within the broader 16-bit bus switch portfolio.

Replacement Considerations

SN74CBT16245CDGGR is listed as a parameter-equivalent replacement option.