SN74LVTH126 3.3-V ABT Quadruple Bus Buffers With 3-State Outputs |

SN74LVTH126 (ACTIVE) 3.3-V ABT Quadruple Bus Buffers With 3-State Outputs

3.3-V ABT Quadruple Bus Buffers With 3-State Outputs - SN74LVTH126


These bus buffers are designed specifically for low-voltage (3.3-V) VCC operation, but with the capability to provide a TTL interface to a 5-V system environment.

The ’LVTH126 devices feature independent line drivers with 3-state outputs. Each output is in the high-impedance state when the associated output-enable (OE) input is low.

Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended.

When VCC is between 0 and 1.5 V, the device is in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 1.5 V, OE should be tied to GND through a pulldown resistor; the minimum value of the resistor is determined by the current-sourcing capability of the driver.

These devices are 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 devices when they are 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.


  • Support Mixed-Mode Signal Operation (5-V Input and Output Voltages With 3.3-V VCC)
  • Support Unregulated Battery Operation Down to 2.7 V
  • Typical VOLP (Output Ground Bounce)
       <0.8 V at VCC = 3.3 V, TA = 25°C
  • Ioff and Power-Up 3-State Support Hot Insertion
  • Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors
  • 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)


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Part number Order Technology Family VCC (Min) (V) VCC (Max) (V) Channels (#) IOL (Max) (mA) IOH (Max) (mA) ICC (uA) Input type Output type Features Data rate (Mbps) Operating temperature range (C) Package Group
SN74LVTH126 Order now LVT     2.7     3.6     4     64     -32     7000     TTL-Compatible CMOS     3-State     Ultra high speed (tpd <5ns)
Partial power down (Ioff)
Over-voltage tolerant inputs
Power up 3-state
320     -40 to 85     SOIC | 14
SO | 14
SSOP | 14
TSSOP | 14
TVSOP | 14