SN74CBTD3384CDWR

Overview

The SN74CBTD3384CDWR is a high-speed TTL-compatible FET bus switch manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and supports data I/O levels from 0 V to 5 V. The device features an integrated diode to VCC, enabling level shifting for 5-V inputs down to 3.3-V output levels. It is organized as two independent 5-bit bus switches with separate output-enable inputs, functioning as either two 5-bit or one 10-bit switch. Key electrical characteristics include a typical ON-state resistance (ron) of 3 Ω and low input/output capacitance of 5 pF in the OFF state.

Feature Summary

• Integrated diode to VCC provides level shifting for 5-V input down to 3.3-V output levels
• Active undershoot-protection circuitry on A and B ports protects against undershoot up to −2 V
• Supports partial-power-down mode operation using Ioff feature to prevent damaging backflow current
• Bidirectional data flow with near-zero propagation delay and low ON-state resistance

Applications

• Memory interleaving
• Bus isolation
• Low-distortion signal gating

Procurement Notes

Verify the ordering suffix 'DW' corresponds to the SOIC package and 'R' indicates tape-and-reel packaging. Confirm RoHS compliance status and lead finish details via the manufacturer's latest Package Option Addendum. Ensure control inputs are tied to VCC or GND during operation to maintain proper device functionality. Check moisture sensitivity level ratings before assembly processing.

Selection Notes

Select this component when interfacing between 5-V and 3.3-V logic domains requiring bidirectional data transfer. The integrated level-shifting diode eliminates external components for voltage translation. Consider the low ON-state resistance for minimal signal attenuation. Verify that the operating temperature range of -40°C to 85°C meets system environmental requirements.

Part Context

This part belongs to the SN74CBTD3384C series of high-speed FET bus switches. It is designed for applications requiring fast switching speeds and low power consumption. The device is available in multiple packages including SOIC, SSOP, TSSOP, and TVSOP. It is fully specified for partial-power-down applications and offers latch-up performance exceeding 100 mA per JESD 78, Class II.

Replacement Considerations

SN74CBTD3384CDW (Tube version)

FAQ

How does the device handle level shifting?

An integrated diode in series with VCC allows the device to shift 5-V input signals down to 3.3-V output levels.

What is the function of the Ioff feature?

The Ioff feature ensures that damaging current will not backflow through the device when it is powered down, supporting partial-power-down mode operation.