SCAS294O JANUARY   1993  – June 2015 SN54LVC257A , SN74LVC257A

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Options
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information: 16-Pin Packages
    5. 7.5  Thermal Information: 20-Pin Package
    6. 7.6  Electrical Characteristics
    7. 7.7  SN54LVC257A Switching Characteristics
    8. 7.8  SN74LVC257A Switching Characteristics
    9. 7.9  Operating Characteristics
    10. 7.10 Typical Characteristics
  8. 8 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
    4. 9.4 Device Functional Modes
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Documentation Support
      1. 13.1.1 Related Documentation
    2. 13.2 Related Links
    3. 13.3 Community Resources
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6 Pin Configuration and Functions

D, DB, NS, J, W, or PW Package
16-Pin SOIC, SSOP, SO, CDIP, CFP, or TSSOP
Top View
SN54LVC257A SN74LVC257A PO_CAS294_1.gif
RGY Package
16-Pin VQFN with Exposed Thermal Pad
Top View
SN54LVC257A SN74LVC257A PO_CAS294_2.gif
FK Package
20-Pin LCCC
Top View
SN54LVC257A SN74LVC257A PO_CAS294_3.gif

Pin Functions

PIN I/O DESCRIPTION
NAME SOIC, SSOP, SO, CDIP, CFP, TSSOP, or VQFN LCCC
A/B 1 2 I Select Pin, Low selects A, High selects B
1A 2 3 I/O Multiplexer Signal Input
1B 3 4 I/O Multiplexer Signal Input
1Y 4 5 I/O Multiplexer Output
2A 5 7 I/O Multiplexer Signal Input
2B 6 8 I/O Multiplexer Signal Input
2Y 7 9 I/O Multiplexer Output
3A 11 14 I/O Multiplexer Signal Input
3B 10 13 I/O Multiplexer Signal Input
3Y 9 12 I/O Multiplexer Output
4A 14 18 I/O Multiplexer Signal Input
4B 13 17 I/O Multiplexer Signal Input
4Y 12 15 I/O Multiplexer Output
GND 8 10 — Ground
NC(1) — 1, 6, 11, 16 — No connect
OE 15 19 I/O Active low Output enable
VCC 16 20 — Power pin
(1) NC – no internal connection