SN74CB3T3383PWR

Overview

The SN74CB3T3383PWR is a high-speed TTL-compatible FET bus-exchange switch in a 24-pin TSSOP package. It operates with a supply voltage (VCC) ranging from 2.3 V to 3.6 V and supports data I/O voltages from 0 V to 5.5 V. The device features bidirectional data flow with near-zero propagation delay, low ON-state resistance (ron), and low input/output capacitance. It includes an enable (BE) input for bus-exchange functionality and provides 5-V-tolerant I/Os even when powered down.

Feature Summary

• Supports mixed-mode signal operation by translating voltage levels that track the VCC supply voltage
• Enables partial-power-down mode via Ioff feature to prevent damaging backflow current
• Provides bidirectional data flow with low ON-state resistance and minimal loading capacitance
• Features undershoot clamp diodes on data and control inputs

Applications

• Level translation between different switching standards
• Memory interleaving in mixed-voltage systems
• Bus isolation for portable equipment

Procurement Notes

Verify the specific ordering suffix 'PWR' corresponds to the tape-and-reel packaging format rather than the tube variant. Confirm the RoHS compliance status and lead finish details against the latest Texas Instruments Package Option Addendum. Ensure the component meets the required operating temperature range of -40°C to 85°C for your specific application environment.

Selection Notes

Select this component when a 10-bit bus switch or 5-bit bus-exchange capability is required within a 2.3-V to 3.6-V system. It is suitable for applications needing 5-V tolerant I/Os while operating at lower core voltages. Consider the TSSOP-24 package constraints and the need for an enable pin to manage bus exchange states effectively.

Part Context

This part belongs to the SN74CB3T3383 family of digital bus switches manufactured by Texas Instruments. The 'PWR' suffix specifically denotes the TSSOP package type with tape-and-reel shipping configuration. It shares functional characteristics with other variants like SN74CB3T3383PW but differs in packaging and handling specifications.

Replacement Considerations

SN74CB3T3383PWG4 is a confirmed substitute offering identical electrical performance in the same TSSOP package but with updated manufacturing processes.

FAQ

How does the device handle voltage translation?

The output voltage tracks the VCC supply voltage, allowing it to translate signals from higher input levels (up to 5.5 V) down to the lower VCC level.

What is the function of the BE input?

The BE (Bus Exchange) input controls the switching state; when low, it enables data exchange based on the BX select input, and when high, it disconnects the ports.