SCLS132F December   1982  – February 2022 SN54HC251 , SN74HC251

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 Switching Characteristics
    7. 5.7 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 Receiving Notification of Documentation Updates
    2. 10.2 Support Resources
    3. 10.3 Trademarks
    4. 10.4 Electrostatic Discharge Caution
    5. 10.5 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
  • FK|20
Thermal pad, mechanical data (Package|Pins)
Orderable Information

5.6 Switching Characteristics

over recommended operating free-air temperature range, CL = 150 pF (unless otherwise noted) (see Figure 6-1)
PARAMETER FROM
(INPUT)		 TO
(OUTPUT)		 VCC (V) TA = 25°C SN54HC251 SN74HC251 UNIT
MIN TYP MAX MIN MAX MIN MAX
tpd A, B, or C W or Y 2 72 300 450 375 ns
4.5 25 60 90 75
6 22 52 77 65
Any D W or Y 2 59 300 450 375
4.5 21 60 90 75
6 18 52 77 65
ten OE W or Y 2 50 230 340 285 ns
4.5 17 46 68 57
6 15 40 58 50
tt W or Y 2 45 210 315 265 ns
4.5 17 42 63 53
6 13 36 53 45