SCLS171F March   1984  – March 2022 SN54HCT138 , SN74HCT138

PRODUCTION DATA  

  1. 1 Features
  2. 2 Description
  3. 3 Revision History
  4. 4 Pin Configuration and Functions
  5. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 Recommended Operating Conditions (1)
    3. 5.3 Thermal Information
    4. 5.4 Electrical Characteristics
    5. 5.5 Switching Characteristics
    6. 5.6 Operating Characteristics
  6. 6 Parameter Measurement Information
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Device Functional Modes
  8. 8 Power Supply Recommendations
  9. 9 Layout
    1. 9.1 Layout Guidelines
  10. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • W|16
  • J|16
  • FK|20
Thermal pad, mechanical data (Package|Pins)
Orderable Information

2 Description

The ’HCT138 devices are designed for high-performance memory-decoding or data-routing applications requiring very short propagation delay times. In high-performance memory systems, these decoders can minimize the effects of system decoding. When employed with high-speed memories utilizing a fast enable circuit, the delay times of these decoders and the enable time of the memory usually are less than the typical access time of the memory. This means that the effective system delay introduced by the decoders is negligible.

Device Information
PART NUMBER PACKAGE(1) BODY SIZE (NOM)
SN74HCT138D SOIC (16) 9.90 mm × 3.90 mm
SN74HCT138N PDIP (16) 19.31 mm × 6.35 mm
SN74HCT138NS SO (16) 6.20 mm × 5.30 mm
SN74HCT138PW TSSOP (16) 5.00 mm × 4.40 mm
SN54HCT138J CDIP (16) 24.38 mm × 6.92 mm
SNJ54HCT138FK LCCC (20) 8.89 mm × 8.45 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
GUID-E8E8E9F4-81A0-42C6-87B2-C7E3DF72A188-low.png Functional Block Diagram