SCHS147J November   1998  – November 2021 CD54HC138 , CD54HC238 , CD54HCT138 , CD54HCT238 , CD74HC138 , CD74HC238 , CD74HCT138 , CD74HCT238

PRODUCTION DATA  

  1. 1 Features
  2. 2 Description
  3. 3 Revision History
  4. 4 Pin Configuration and Functions
    1.     5
  5. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 Recommended Operating Conditions
    3. 5.3 Thermal Information
    4. 5.4 Electrical Characteristics
    5. 5.5 Switching Characteristics (2)
  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)
  • N|16
  • D|16
Thermal pad, mechanical data (Package|Pins)
Orderable Information

2 Description

The CDx4HC(T)138 and '238 are three to eight decoders with one standard output strobe (G2) and two active low output strobes (G1 and G0). When the outputs are gated by any of the strobe inputs, they are all forced into the high state. When the outputs are not disabled by the strobe inputs, only the selected output is low while all others are high.

The CDx4HC(T)238 is a three to eight decoder with one standard output strobe (G2) and two active low output strobes (G1 and G0). When the outputs are gated by any of the strobe inputs, they are all forced into the low state. When the outputs are not disabled by the strobe inputs, only the selected output is high while all others are low.

Device Information
PART NUMBER PACKAGE(1) BODY SIZE (NOM)
CD74HC138E PDIP (16) 25.40 mm × 6.35 mm
CD74HCT138E PDIP (16) 25.40 mm × 6.35 mm
CD74HCT238E PDIP (16) 25.40 mm × 6.35 mm
CD74HC138M SOIC (16) 9.90 mm × 3.90 mm
CD74HCT238M SOIC (16) 9.90 mm × 3.90 mm
CD74HC238NS SO (16) 10.20 mm × 5.30 mm
CD74HC238PW TSSOP (16) 5.00 mm × 4.40 mm
CD74HCT238PW TSSOP (16) 5.00 mm × 4.40 mm
CD54HC138F CDIP (16) 21.34 mm × 6.92 mm
CD54HCT138F CDIP (16) 21.34 mm × 6.92 mm
CD54HCT238F CDIP (16) 21.34 mm × 6.92 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.