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SN74LVC4245A

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Achtfach-Bustransceiver und Umsetzer von 3,3 auf 5 V, mit Tri-State-Ausgängen

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SN74LVC4245A

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Produktdetails

Bits (#) 8 Data rate (max) (Mbps) 200 Topology Push-Pull Vin (min) (V) 4.5 Vin (max) (V) 5.5 Vout (min) (V) 2.7 Vout (max) (V) 5.5 Applications GPIO, JTAG, SPI, UART Features Output enable Prop delay (ns) 6.7 Technology family LVC Supply current (max) (mA) 0.13 Rating Catalog Operating temperature range (°C) -40 to 85
Bits (#) 8 Data rate (max) (Mbps) 200 Topology Push-Pull Vin (min) (V) 4.5 Vin (max) (V) 5.5 Vout (min) (V) 2.7 Vout (max) (V) 5.5 Applications GPIO, JTAG, SPI, UART Features Output enable Prop delay (ns) 6.7 Technology family LVC Supply current (max) (mA) 0.13 Rating Catalog Operating temperature range (°C) -40 to 85
SOIC (DW) 24 159.65 mm² 15.5 x 10.3 SSOP (DB) 24 63.96 mm² 8.2 x 7.8 TSSOP (PW) 24 49.92 mm² 7.8 x 6.4
  • 8-bit direction controlled translating bus transceiver
  • 5.5V on A port and 2.7V to 3.6V on B port
  • High drive strength for heavier loading conditions
    • 24mA at 3V supply
  • Robust, glitch-free power supply sequencing
  • VCC isolation and VCC disconnect feature
    • If either VCC input is below 100mV or left floating, all I/O outputs are disabled and become high impedance
  • Control inputs VIH/VIL levels are referenced to VCCA voltage
  • Ioff supports Partial-Power-Down node operation
  • Latch-up performance exceeds 250mA per JESD 17
  • Operating temperature range -40°C to 85°C
  • ESD protection exceeds JESD 22
    • 2000V Human-Body Model
    • 1000V Charged-Device Model
  • Compatible with SN74LVC4245
  • 8-bit direction controlled translating bus transceiver
  • 5.5V on A port and 2.7V to 3.6V on B port
  • High drive strength for heavier loading conditions
    • 24mA at 3V supply
  • Robust, glitch-free power supply sequencing
  • VCC isolation and VCC disconnect feature
    • If either VCC input is below 100mV or left floating, all I/O outputs are disabled and become high impedance
  • Control inputs VIH/VIL levels are referenced to VCCA voltage
  • Ioff supports Partial-Power-Down node operation
  • Latch-up performance exceeds 250mA per JESD 17
  • Operating temperature range -40°C to 85°C
  • ESD protection exceeds JESD 22
    • 2000V Human-Body Model
    • 1000V Charged-Device Model
  • Compatible with SN74LVC4245

This 8-bit (octal) noninverting bus transceiver contains two separate supply rails; B port has VCCB, which is set at 3.3V, and A port has VCCA, which is set at 5V. This allows for translation from a 3.3V to a 5V environment, and vice versa.

The SN74LVC4245A device is designed for asynchronous communication between data buses. The device transmits data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so the buses are effectively isolated. The control circuitry (DIR, OE) is powered by VCCA.

The SN74LVC4245A device terminal out allows the designer to switch to a normal all 3.3V or all 5V 20-terminal SN74LVC4245 device without board re-layout. The designer uses the data paths for pins 2–11 and 14–23 of the SN74LVC4245A device to align with the conventional ’245 terminal out.

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 VCC isolation feature is designed so that if either VCCA or VCCB is less than 100mV, both I/O ports enter a high-impedance state by disabling the outputs.

This 8-bit (octal) noninverting bus transceiver contains two separate supply rails; B port has VCCB, which is set at 3.3V, and A port has VCCA, which is set at 5V. This allows for translation from a 3.3V to a 5V environment, and vice versa.

The SN74LVC4245A device is designed for asynchronous communication between data buses. The device transmits data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so the buses are effectively isolated. The control circuitry (DIR, OE) is powered by VCCA.

The SN74LVC4245A device terminal out allows the designer to switch to a normal all 3.3V or all 5V 20-terminal SN74LVC4245 device without board re-layout. The designer uses the data paths for pins 2–11 and 14–23 of the SN74LVC4245A device to align with the conventional ’245 terminal out.

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 VCC isolation feature is designed so that if either VCCA or VCCB is less than 100mV, both I/O ports enter a high-impedance state by disabling the outputs.
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Technische Dokumentation

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Top-Dokumentation Typ Titel Format-Optionen Datum
* Data sheet SN74LVC4245A Octal Bus Transceiver and 3.3V to 5V Shifter With 3-State Outputs datasheet (Rev. K) PDF | HTML 29 Mai 2026
Selection guide Logic Guide (Rev. AC) PDF | HTML 13 Nov 2025
Application note Schematic Checklist - A Guide to Designing With Fixed or Direction Control Translators PDF | HTML 02 Okt 2024
Application note Schematic Checklist - A Guide to Designing with Auto-Bidirectional Translators PDF | HTML 12 Jul 2024
Application note Understanding Transient Drive Strength vs. DC Drive Strength in Level-Shifters (Rev. A) PDF | HTML 03 Jul 2024
Application note Implications of Slow or Floating CMOS Inputs (Rev. E) 26 Jul 2021
Selection guide Voltage Translation Buying Guide (Rev. A) 15 Apr 2021
Selection guide Little Logic Guide 2018 (Rev. G) 06 Jul 2018
Application note How to Select Little Logic (Rev. A) 26 Jul 2016
Application note Understanding and Interpreting Standard-Logic Data Sheets (Rev. C) 02 Dez 2015
User guide LOGIC Pocket Data Book (Rev. B) 16 Jan 2007
Product overview 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
Application note Use of the CMOS Unbuffered Inverter in Oscillator Circuits 06 Nov 2003
User guide LVC and LV Low-Voltage CMOS Logic Data Book (Rev. B) 18 Dez 2002
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 Mai 2002
Application note Power-Up 3-State (PU3S) Circuits in TI Standard Logic Devices 10 Mai 2002
More literature STANDARD LINEAR AND LOGIC FOR DVD/VCD PLAYERS 27 Mär 2002
Application note Migration From 3.3-V To 2.5-V Power Supplies For Logic Devices 01 Dez 1997
Application note Bus-Interface Devices With Output-Damping Resistors Or Reduced-Drive Outputs (Rev. A) 01 Aug 1997
Application note CMOS Power Consumption and CPD Calculation (Rev. B) 01 Jun 1997
Application note LVC Characterization Information 01 Dez 1996
Application note Input and Output Characteristics of Digital Integrated Circuits 01 Okt 1996
Application note Live Insertion 01 Okt 1996
Design guide Low-Voltage Logic (LVC) Designer's Guide 01 Sep 1996
Application note Understanding Advanced Bus-Interface Products Design Guide 01 Mai 1996

Design und Entwicklung

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Simulationsmodell

SN74LVC4245A IBIS Model

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Gehäuse Pins CAD-Symbole, Footprints und 3D-Modelle
SOIC (DW) 24 Ultra Librarian
SSOP (DB) 24 Ultra Librarian
TSSOP (PW) 24 Ultra Librarian
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  • Blei-Finish/Ball-Material
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