SCLS595B November   2004  – August 2024 CD74HC4538-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Description
  4. 3 Pin Configuration and Functions
  5. 4 Specifications
    1. 4.1 Absolute Maximum Ratings
    2. 4.2 ESD Ratings
    3. 4.3 Recommended Operating Conditions
    4. 4.4 Thermal Information
    5. 4.5 Electrical Characteristics
    6. 4.6 Timing Requirements
    7. 4.7 Switching Characteristics
    8. 4.8 Operating Characteristics
    9. 4.9 Typical Characteristics
  6. 5 Parameter Measurement Information
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Typical Application
    2. 7.2 Power Supply Recommendations
    3. 7.3 Layout
      1. 7.3.1 Layout Guidelines
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support (Analog)
      1. 8.1.1 Related Links
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • PW|16
  • D|16
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.3 Device Functional Modes

Table 6-1 Function Table
INPUTS OUTPUTS
R A B Q Q
L X X L H
X H X L H
X X L L H
H L ↓ CD74HC4538-Q1 CD74HC4538-Q1
H ↑ H CD74HC4538-Q1 CD74HC4538-Q1
Table 6-2 Functional Terminal Connections
FUNCTION VCC TO TERMINAL NUMBER GND TO TERMINAL NUMBER INPUT PULSE TO TERMINAL NUMBER OTHER CONNECTIONS
MONO(1) MONO(2) MONO(1) MONO(2) MONO(1) MONO(2) MONO(1) MONO(2)
Leading-edge trigger/retriggerable 3, 5 11, 13 4 12
Leading-edge trigger/nonretriggerable 3 13 4 12 5−7 11−9
Trailing-edge trigger/retriggerable 3 13 4 12 5 11
Trailing-edge trigger/nonretriggerable 3 13 5 11 4−6 12−10
(1) A retriggerable one-shot multivibrator has an output pulse width that is extended one full time period (T) after application of the last trigger pulse.
(2) A nontriggerable one-shot multivibrator has a time period (T) referenced from the application of the first trigger pulse.
CD74HC4538-Q1 Input Pulse TrainInput Pulse Train
CD74HC4538-Q1 Nonretriggerable Mode Pulse Width (A Mode)Nonretriggerable Mode Pulse Width (A Mode)
CD74HC4538-Q1 Retriggerable Mode Pulse Width (A Mode)Retriggerable Mode Pulse Width (A Mode)