SCHS185E September   1997  – April 2022 CD54HCT390 , CD74HC390 , CD74HCT390

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 Prerequisite for Switching Characteristics
    6. 5.6 Switching 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)
  • J|16
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.3 Device Functional Modes

Table 7-1 Truth Table(1)
INPUTS ACTION
CLK CLR
↑ L No Change
↓ L Count
X H All Qs Low
(1) H = High voltage level.
L = Low voltage level.
X = Dont care.
↑ = Transition from low to high level.
↓ = Transition from high to low.
Table 7-2 BCD Count Sequence For ½ the 390(1)
COUNT OUTPUTS
QD QC QB QA
0 L L L L
1 L L L H
2 L L H L
3 L L H H
4 L H L L
5 L H L H
6 L H H L
7 L H H H
8 H L L L
9 H L L H
(1) Ouput nQA connected to nCLKB with counter input on nCLKA.
Table 7-3 B-Quinary Count Sequence For ½ the 390(1)
COUNT OUTPUTS
QD QC QB QA
0 L L L L
1 L L H L
2 L H L L
3 L H H L
4 H L L L
5 L L L H
6 L L H H
7 L H L H
8 L H H H
9 H L L H
(1) Output nQD connected to nCLKA with counter input on nCLKB.