7 Detailed Description

7.1 Overview

The SN74LVC126A quadruple buffer is designed for 1.65-V to 3.6-V VCC operation and features tri-state outputs.

The SN74LVC126A devices perform the Boolean function Y = A in positive logic.

Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as down-

translators in a mixed 3.3-V or 5-V system environment.

7.2 Functional Block Diagram

1

1OE

2

1A

1Y

3

4

2OE

5

2A

2Y

6

10

3OE

9

3A

3Y

8

13

4OE

12

4A

4Y

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7.3 Feature Description

The SN74LVC126A device features four independent buffers with 3-state outputs, and is designed to operate

from a VCC of 1.65 V to 3.6 V. When the output enable (OE) input is low, the corresponding output is

disabled and enters a high-impedance state. This device also features high-tolerance inputs, allowing for voltage

translation in mixed voltage systems. Wide operating temperature range enables this device to be used in any

application, including rugged or extreme environments.

7.4 Device Functional Modes

The SN74LVC126A's 3-state outputs allow the outputs to be disabled using the output enable (OE) pin. To

ensure the high-impedance state during power up and power down, OE must be tied to GND through a pulldown

resistor. The minimum value of the resistor is determined by the current-sourcing capability of the driver.

Table 7-1. Function Table

(Each Buffer)

INPUTS

OUTPUT

OE

A

Y

H

H

H

H

L

L

L

X

Hi-Z

SN74LVC126A

SCAS339T – MARCH 1994 – REVISED MAY 2024

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