5-V, 32-channel FET bus switch for partial-power-down applications with up to 4 control inputs

SN74CBT34X245

ACTIVE

Product details

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TSSOP (DBB) 80 138 mm² 17 x 8.1
  • Member of Texas Instruments' Widebus+™ Family
  • 5- Switch Connection Between Two Ports
  • TTL-Compatible Input Levels
  • Flow-Through Architecture Optimizes PCB Layout
  • Ioff Supports Partial-Power-Down Mode Operation
  • Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
  • ESD Protection Exceeds JESD 22
    • 2000-V Human-Body Model (A114-A)
    • 200-V Machine Model (A115-A)
    • 1000-V Charged-Device Model (C101)

Widebus+ is a trademark of Texas Instruments.

  • Member of Texas Instruments' Widebus+™ Family
  • 5- Switch Connection Between Two Ports
  • TTL-Compatible Input Levels
  • Flow-Through Architecture Optimizes PCB Layout
  • Ioff Supports Partial-Power-Down Mode Operation
  • Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
  • ESD Protection Exceeds JESD 22
    • 2000-V Human-Body Model (A114-A)
    • 200-V Machine Model (A115-A)
    • 1000-V Charged-Device Model (C101)

Widebus+ is a trademark of Texas Instruments.

The SN74CBT34X245 provides 32 bits of high-speed TTL-compatible bus switching. The low on-state resistance of the switch allows connections to be made with minimal propagation delay.

The device is organized as four 8-bit bus switches, two 16-bit bus switches, or one 32-bit bus switch. When output enable (OE\) is low, the switch is on, and port A is connected to port B. When OE\ is high, the switch is open, and the high-impedance state exists between the two ports.

This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down.

The SN74CBT34X245 provides 32 bits of high-speed TTL-compatible bus switching. The low on-state resistance of the switch allows connections to be made with minimal propagation delay.

The device is organized as four 8-bit bus switches, two 16-bit bus switches, or one 32-bit bus switch. When output enable (OE\) is low, the switch is on, and port A is connected to port B. When OE\ is high, the switch is open, and the high-impedance state exists between the two ports.

This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down.

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Technical documentation

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Type Title Date
* Data sheet 32-Bit FET Bus Switch datasheet (Rev. C) 30 Apr 2001
Application note Selecting the Right Texas Instruments Signal Switch (Rev. C) 06 Aug 2021
Application note Implications of Slow or Floating CMOS Inputs (Rev. E) 26 Jul 2021
Application note Multiplexers and Signal Switches Glossary (Rev. A) 09 Jun 2021
Application note Eliminate Power Sequencing with Powered-off Protection Signal Switches (Rev. C) 06 Jan 2021
Selection guide Little Logic Guide 2018 (Rev. G) 06 Jul 2018
Selection guide Logic Guide (Rev. AB) 12 Jun 2017
Application note How to Select Little Logic (Rev. A) 26 Jul 2016
Application note Understanding and Interpreting Standard-Logic Data Sheets (Rev. C) 02 Dec 2015
User guide LOGIC Pocket Data Book (Rev. B) 16 Jan 2007
More literature Digital Bus Switch Selection Guide (Rev. A) 10 Nov 2004
More literature Design Summary for WCSP Little Logic (Rev. B) 04 Nov 2004
Application note Semiconductor Packing Material Electrostatic Discharge (ESD) Protection 08 Jul 2004
Application note Selecting the Right Level Translation Solution (Rev. A) 22 Jun 2004
User guide Signal Switch Data Book (Rev. A) 14 Nov 2003
More literature Logic Cross-Reference (Rev. A) 07 Oct 2003
More literature CBT RAID Application Clip 12 Jun 2003
Application note Bus FET Switch Solutions for Live Insertion Applications 07 Feb 2003
Application note Texas Instruments Little Logic Application Report 01 Nov 2002
Application note TI IBIS File Creation, Validation, and Distribution Processes 29 Aug 2002
More literature Standard Linear & Logic for PCs, Servers & Motherboards 13 Jun 2002
Application note 16-Bit Widebus Logic Families in 56-Ball, 0.65-mm Pitch Very Thin Fine-Pitch BGA (Rev. B) 22 May 2002
Application note Flexible Voltage-Level Translation With CBT Family Devices 20 Jul 1999
User guide CBT (5-V) And CBTLV (3.3-V) Bus Switches Data Book (Rev. B) 01 Dec 1998
Application note 3.3-V to 2.5-V Translation with Texas Instruments Crossbar Technology (Rev. A) 03 Apr 1998
Application note Migration From 3.3-V To 2.5-V Power Supplies For Logic Devices 01 Dec 1997
Application note 5-V To 3.3-V Translation With the SN74CBTD3384 (Rev. B) 01 Mar 1997
Application note Understanding Advanced Bus-Interface Products Design Guide 01 May 1996

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TSSOP (DBB) 80 View options

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