SN74LVC541APWR datasheet(10/46 Pages) TI2

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7 Detailed Description

7.1 Overview

The SNx4LVC541A contains eight buffers with 3-state outputs. The active low output enable pins (OE1 and

OE2) control all eight channels, and are configured so that both must be low for the outputs to be active.

When the outputs are enabled, the outputs are actively driven low or high.

When the outputs are disabled, the outputs are set into the high-impedance state.

7.2 Functional Block Diagram

OE1

OE2

To Seven Other Channels

Figure 7-1. Logic Diagram (Positive Logic)

7.3 Feature Description

7.3.1 Balanced CMOS 3-State Outputs

This device includes balanced CMOS 3-state outputs: driving high, driving low, and high impedance. The term

balanced indicates that the device can sink and source similar currents. The drive capability of this device can

create fast edges into light loads, so consider routing and load conditions to prevent ringing. Additionally, the

outputs of this device can drive larger currents than the device can sustain without damage. Limit the output

power of the device to avoid damage from overcurrent. The electrical and thermal limits defined in the Absolute

Maximum Ratings must be followed at all times.

When placed into the high-impedance state, the output does not source or sink current except minor leakage

current as defined in the Electrical Characteristics table. In the high-impedance state, the device does not control

the output voltage. The output current is dependent on external factors. A floating node is a node that has no

other drivers connected, and the voltage is unknown. A pull-up or pull-down resistor can be connected to the

output to provide a known voltage at the output while the device is in the high-impedance state. The value

of the resistor depends on multiple factors, including parasitic capacitance and power consumption limitations.

Typically, a 10kΩ resistor meets these requirements.

Leave unused 3-state CMOS outputs disconnected.

7.3.2 Partial Power Down (Ioff)

This device includes circuitry to disable all outputs when the supply pin is held at 0V. When disabled, the outputs

neither source nor sink current, regardless of the input voltages. The amount of leakage current at each output is

defined by the Ioff specification in the Electrical Characteristics table.

7.3.3 Standard CMOS Inputs

This device includes standard CMOS inputs. Standard CMOS inputs are high impedance and are typically

modeled as a resistor in parallel with the input capacitance given in the Electrical Characteristics. The worst

case resistance is calculated with the maximum input voltage, given in the Absolute Maximum Ratings, and the

maximum input leakage current, given in the Electrical Characteristics, using Ohm's law (R = V ÷ I).

Standard CMOS inputs require that input signals transition between valid logic states quickly, as defined by the

input transition time or rate in the Recommended Operating Conditions table. Failing to meet this specification

SN54LVC541A, SN74LVC541A

SCAS298O – JANUARY 1993 – REVISED JUNE 2026

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