SCLS303E January   1996  – September 2022 SN54HC640 , SN74HC640

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)
  • NS|20
  • N|20
  • DW|20
  • PW|20
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6 Parameter Measurement Information

tpd is the maximum between tPLH and tPHL

tt is the maximum between tTLH and tTHL

tdisis the maximum between tPLZ and tPHZ

ten is the maximum between tPZL and tPZH

GUID-C58C1CA1-D2D4-47F4-BA63-FF8C9A81AFF3-low.pngFigure 6-1 Load Circuit
GUID-2FCAB397-2180-4283-863A-7FD32792D665-low.pngFigure 6-3 Voltage Waveforms
Propagation Delay and Output Transition Times
GUID-F5EFEC7E-D443-4BAA-A05C-ECA3016E2642-low.pngFigure 6-5 Voltage Wavefroms
Propagation Delay and Output Transition Times
GUID-4EBBDD1C-2018-46E3-98D5-D397A8ABA21C-low.pngFigure 6-2
GUID-52CF3331-75F7-48BA-A90B-C0E90E596ABB-low.pngFigure 6-4 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 the following characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr = 6 ns, tf = 6 ns.

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