CD74AC251 8-Input Multiplexer with 3-State Outputs |

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8-Input Multiplexer with 3-State Outputs

8-Input Multiplexer with 3-State Outputs - CD74AC251


The CD74AC251 and CD74ACT251 8-input multiplexers that utilize the Harris Advanced CMOS Logic technology. This multiplexer features both true (Y) and complement (Y\) outputs as well as an Output Enable (OE\) input. The OE must be at a LOW logic level to enable this device. When the OE\ input is HIGH, both outputs are in the high-impedance state. When enabled, address information on the data select inputs determines which data input is routed to the Y and Y\ outputs.


  • Buffered Inputs
  • Typical Propagation Delay
    - 6ns at VCC = 5V, TA = 25°C, CL = 50pF
  • Exceeds 2kV ESD Protection MIL-STD-883, Method 3015
  • SCR-Latchup-Resistant CMOS Process and Circuit Design
  • Speed of Bipolar FAST™/AS/S with Significantly Reduced Power Consumption
  • Balanced Propagation Delays
  • AC Types Feature 1.5V to 5.5V Operation and Balanced Noise Immunity at 30% of the Supply
  • ±24mA Output Drive Current
    - Fanout to 15 FAST™ ICs
    - Drives 50 Transmission Lines
  • Characterized for operation from –40° to 85°C

FAST™ is a Trademark of Fairchild Semiconductor.


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Part number Order Function Technology Family VCC (Min) (V) VCC (Max) (V) Channels (#) Voltage (Nom) (V) F @ nom voltage (Max) (MHz) ICC @ nom voltage (Max) (mA) tpd @ nom Voltage (Max) (ns) Configuration Type IOL (Max) (mA) IOH (Max) (mA) Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG) Bits (#) Digital input leakage (Max) (uA) ESD CDM (kV) ESD HBM (kV)
CD74AC251 Order now Encoder
AC     1.5     5.5     1     1.5
100     0.08     153
8:1     3-State Output     24     -24     Catalog     -55 to 125     SOIC | 16     16SOIC: 59 mm2: 6 x 9.9 (SOIC | 16)     8     5     0.75     2