SCLS260M December   1995  – May 2016 SN54AHC540 , SN74AHC540

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics
    6. 6.6  Switching Characteristics, VCC = 3.3 V ± 0.3 V
    7. 6.7  Switching Characteristics, VCC = 5 V ± 0.5 V
    8. 6.8  Noise Characteristics
    9. 6.9  Operating Characteristics
    10. 6.10 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curve
  10. 10Power Supply Recommendations
    1. 10.1 Layout Guidelines
  11. 11Layout
    1. 11.1 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Community Resources
    2. 12.2 Related Links
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • DGV|20
  • DB|20
  • N|20
  • DW|20
  • PW|20
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8 Detailed Description

8.1 Overview

The SNx4AHC540 octal buffers/drivers are ideal for driving bus lines or buffer memory address registers. These devices feature inputs and outputs on opposite sides of the package to facilitate printed circuit board layout.

The 3-state control gate is a two-input AND gate with active-low inputs. If either output-enable (OE1 or OE2) input is high, all corresponding outputs are in the high-impedance state. The outputs provide inverted data when they are not in the high-impedance state.

OE should be tied to VCC through a pullup resistor to ensure the high-impedance state during power up or power down. The minimum value of the resistor is determined by the current-sinking capability of the driver.

8.2 Functional Block Diagram

SN54AHC540 SN74AHC540 ld_cls260_v3.gif

8.3 Feature Description

SNx4AHC540 device has a wide operating voltage range and operates from 2 V to 5.5 V. The inputs accept voltages up to 5.5 V, which allows for down translation. Slow input edges and low drive will minimize output overshoots and undershoots.

8.4 Device Functional Modes

Table 1 shows the device functions for each buffer and driver.

Table 1. Function Table (Each Buffer/Driver)

INPUTS OUTPUT
Y
OE1 OE2 A
L L L H
L L H L
H X X Hi-Z
X H X Hi-Z