SCHS169D November   1998  – March 2022 CD54HC251 , CD54HCT251 , CD74HC251 , CD74HCT251

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. 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)
  • N|16
  • D|16
Thermal pad, mechanical data (Package|Pins)
Orderable Information

5.4 Electrical Characteristics

PARAMETER TEST CONDITIONS(1) VCC
(V)		 25°C –40°C to 85°C –55°C to 125°C UNIT
MIN TYP MAX MIN MAX MIN MAX
HC TYPES
VIH High-level input voltage 2 1.5 1.5 1.5 V
4.5 3.15 3.15 3.15 V
6 4.2 4.2 4.2 V
VIL Low-level input voltage 2 0.5 0.5 0.5 V
4.5 1.35 1.35 1.35 V
6 1.8 1.8 1.8 V
VOH High-level output voltage

CMOS loads

 IOH = – 20μA 2 1.9 1.9 1.9 V
IOH = – 20μA 4.5 4.4 4.4 4.4 V
IOH = – 20μA 6 5.9 5.9 5.9 V
High-level output voltage

TTL loads

 IOH = – 6mA 4.5 3.98 3.84 3.7 V
IOH = – 7.8mA 6 5.48 5.34 5.2 V
VOL Low-level output voltage

CMOS loads

 IOL = 20μA 2 0.1 0.1 0.1 V
IOL = 20μA 4.5 0.1 0.1 0.1 V
IOL = 20μA 6 0.1 0.1 0.1 V
Low-level output voltage

TTL loads

 IOL = 6mA 4.5 0.26 0.33 0.4 V
IOL = 7.8mA 6 0.26 0.33 0.4 V
II Input leakage current VCC or GND 6 ±0.1 ±1 ±1 µA
ICC Supply current VCC or GND 6 8 80 160 µA
IOZ Three-state leakage current 6 ±0.5 ±0.5 ±10 µA
HCT TYPES
VIH High-level input voltage 4.5 to 5.5 2 2 2 V
VIL Low-level input voltage 4.5 to 5.5 0.8 0.8 0.8 V
VOH High-level output voltage

CMOS loads

 IOH = – 20μA 4.5 4.4 4.4 4.4 V
High-level output voltage

TTL loads

 IOH = – 6mA 4.5 3.98 3.84 3.7 V
VOL Low-level output voltage

CMOS loads

 IOL = 20μA 4.5 0.1 0.1 0.1 V
Low-level output voltage

TTL loads

 IOL = 6mA 4.5 0.26 0.33 0.4 V
II Input leakage current VCC and GND 5.5 ±0.1 ±1 ±1 µA
ICC Supply Current VCC and GND 5.5 8 80 160 µA
IOZ Three-state leakage current 6 ±0.5 ±5.0 ±10 µA
∆ICC (2)(3) Additional supply current per input pin S0, S1, S2 4.5 to 5.5 55 198 247.5 269.5 µA
I0 - I7 4.5 to 5.5 50 180 225 245 µA
OE 4.5 to 5.5 265 954 1192.5 1298.5 µA
(1) VI = VIH or VIL, unless otherwise noted.
(2) For dual-supply systems theoretical worst case (VI = 2.4 V, VCC = 5.5 V) specification is 1.8 mA..
(3) Inputs held at VCC – 2.1.