JAJSOA6D November   1998  – March 2022 CD54HC251 , CD54HCT251 , CD74HC251 , CD74HCT251

PRODUCTION DATA  

  1. 1 特長
  2. 2 説明
  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. 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 サポート・リソース
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

パッケージ・オプション

デバイスごとのパッケージ図は、PDF版データシートをご参照ください。

メカニカル・データ（パッケージ｜ピン）
  • J|16
サーマルパッド・メカニカル・データ
発注情報

6 Parameter Measurement Information

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

For clock inputs, fmax is measured when the input duty cycle is 50%.

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

GUID-EB3CF292-AF1E-41A1-A556-76EDB85F7F6F-low.gif
(1) CL includes probe and test-fixture capacitance.
Figure 6-1 Load Circuit for 3-State Outputs
GUID-535BFE0F-9D7B-4CA6-85AB-D09CD11F52EA-low.gif
(1) The greater between tPLH and tPHL is the same as tpd.
Figure 6-2 Voltage Waveforms, Propagation Delays for Standard CMOS Inputs
GUID-20200713-CA0I-ZTM5-PTJB-WD0LZ8VNG7PG-low.gif
(1) The greater between tr and tf is the same as tt.
Figure 6-4 Voltage Waveforms, Input and Output Transition Times for Standard CMOS Inputs
GUID-AC96879B-051A-49E4-8FE0-77EE52991418-low.gif
(1) tPLZ and tPHZ are the same as tdis.
(2) tPZL and tPZH are the same as ten.
Figure 6-3 Voltage Waveforms, Standard CMOS Inputs Propagation Delays
GUID-20201229-CA0I-PGLG-HN2B-WVRKFTLXGRL1-low.gif
(1) The greater between tPLH and tPHL is the same as tpd.
Figure 6-5 Voltage Waveforms, Propagation Delays for TTL-Compatible Inputs
GUID-20201229-CA0I-J2T2-8BXF-WXPFF0CDKQZC-low.gif
(1) tPLZ and tPHZ are the same as tdis.
(2) tPZL and tPZH are the same as ten.
Figure 6-6 Voltage Waveforms, TTL-Compatible CMOS Inputs Propagation Delays