SCLS519B July   2003  – January 2025 SN74HC253-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 Switching Characteristics, CL = 50pF
    7. 4.7 Switching Characteristics, CL = 150pF
    8. 4.8 Operating 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 Power Supply Recommendations
    2. 7.2 Layout
      1. 7.2.1 Layout Guidelines
      2. 7.2.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
    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

5 Parameter Measurement Information

Load Circuit and Voltage Waveforms

SN74HC253-Q1 Load CircuitFigure 5-1 Load Circuit
SN74HC253-Q1 Voltage WaveformsPropagation Delay And Output Transition TimesFigure 5-2 Voltage Waveforms
Propagation Delay And Output Transition Times
SN74HC253-Q1 Voltage Waveform Input Rise and Fall TimesFigure 5-4 Voltage Waveform Input Rise and Fall Times
SN74HC253-Q1
SN74HC253-Q1 Voltage WaveformsEnable and Disable Times For 3-State OutputsFigure 5-3 Voltage Waveforms
Enable and Disable Times For 3-State Outputs

A. CL includes probe and test-fixture capacitance.

B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.

C. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having he following characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr = 6ns, tf = 6ns

D. The outputs are measured one at a time with one input transition per measurement.

E. tPLZ and tPHZ are the same as tdis.

F. tPZL and tPZH are the same as ten.

G. tPLH and tPHL are the same as tpd.