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SN74ABTH245

ACTIVE

Octal Bus Transceivers With 3-State Outputs

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Data sheet

SN74ABTH245

ACTIVE
Data sheet Order now

Product details

Number of channels 8 IOL (max) (mA) 64 IOH (max) (mA) -32 Input type TTL Output type TTL Features Bus-hold, Over-voltage tolerant inputs, Partial power down (Ioff), Power up 3-state, Very high speed (tpd 5-10ns) Technology family ABT Rating Catalog Operating temperature range (°C) -40 to 85
Number of channels 8 IOL (max) (mA) 64 IOH (max) (mA) -32 Input type TTL Output type TTL Features Bus-hold, Over-voltage tolerant inputs, Partial power down (Ioff), Power up 3-state, Very high speed (tpd 5-10ns) Technology family ABT Rating Catalog Operating temperature range (°C) -40 to 85
TSSOP (PW) 20 41.6 mm² (6.5 mm × 6.4 mm) SOIC (DW) 20 131.84 mm² (12.8 mm × 10.3 mm) SSOP (DB) 20 56.16 mm² (7.2 mm × 7.8 mm) PDIP (N) 20 228.702 mm² (24.33 mm × 9.4 mm)
  • State-of-the-Art EPIC-II BTM BiCMOS Design Significantly Reduces Power Dissipation
  • Latch-Up Performance Exceeds 500 mA Per JESD 17
  • Typical VOLP (Output Ground Bounce) < 1 V at VCC = 5 V, TA = 25°C
  • Ioff and Power-Up 3-State Support Hot Insertion
  • High-Drive Outputs (-32-mA IOH, 64-mA IOL)
  • Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors
  • Package Options Include Plastic Small-Outline (DW), Shrink Small-Outline (DB), Thin Shrink Small-Outline (PW), and Thin Very Small-Outline (DGV) Packages, Ceramic Chip Carriers (FK), Plastic (N) and Ceramic (J) DIPs, and Ceramic Flat (W) Package

EPIC-IIB is a trademark of Texas Instruments Incorporated.
  • State-of-the-Art EPIC-II BTM BiCMOS Design Significantly Reduces Power Dissipation
  • Latch-Up Performance Exceeds 500 mA Per JESD 17
  • Typical VOLP (Output Ground Bounce) < 1 V at VCC = 5 V, TA = 25°C
  • Ioff and Power-Up 3-State Support Hot Insertion
  • High-Drive Outputs (-32-mA IOH, 64-mA IOL)
  • Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors
  • Package Options Include Plastic Small-Outline (DW), Shrink Small-Outline (DB), Thin Shrink Small-Outline (PW), and Thin Very Small-Outline (DGV) Packages, Ceramic Chip Carriers (FK), Plastic (N) and Ceramic (J) DIPs, and Ceramic Flat (W) Package

EPIC-IIB is a trademark of Texas Instruments Incorporated.

These octal bus transceivers are designed for asynchronous communication between data buses. The devices transmit 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.

When VCC is between 0 and 2.1 V, the device is in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 2.1 V, OE\ should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

This device is fully specified for hot-insertion applications using Ioff and power-up 3-state. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down. The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down, which prevents driver conflict.

Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.

The SN54ABTH245 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ABTH245 is characterized for operation from -40°C to 85°C.

These octal bus transceivers are designed for asynchronous communication between data buses. The devices transmit 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.

When VCC is between 0 and 2.1 V, the device is in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 2.1 V, OE\ should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

This device is fully specified for hot-insertion applications using Ioff and power-up 3-state. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down. The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down, which prevents driver conflict.

Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.

The SN54ABTH245 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ABTH245 is characterized for operation from -40°C to 85°C.

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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet Octal Bus Transceivers With 3-State Outputs datasheet (Rev. D) Sep 14, 1999
Application note An Overview of Bus-Hold Circuit and the Applications (Rev. B) Sep 17, 2018

Design & development

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Evaluation board

14-24-LOGIC-EVM — Logic product generic evaluation module for 14-pin to 24-pin D, DB, DGV, DW, DYY, NS and PW packages

The 14-24-LOGIC-EVM evaluation module (EVM) is designed to support any logic device that is in a 14-pin to 24-pin D, DW, DB, NS, PW, DYY or DGV package,

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TSSOP (PW) 20 Ultra Librarian
SOIC (DW) 20 Ultra Librarian
SSOP (DB) 20 Ultra Librarian
PDIP (N) 20 Ultra Librarian
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