SN74AS298A Quadruple 2-Input Multiplexers With Storage |

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Quadruple 2-Input Multiplexers With Storage

Quadruple 2-Input Multiplexers With Storage - SN74AS298A


The SN74AS298A is a quadruple 2-input multiplexer with storage that provides essentially the equivalent functional capabilities of two separate MSI functions (SN74AS157 and ´AS175A) in a 16-pin package.

When the word-select (WS) input is low, word 1 (A1, B1, C1, D1) is applied to the flip-flops. A high input to WS causes the selection of word 2 (A2, B2, C2, D2). The selected word is clocked to the output terminals on the negative-going edge of the clock pulse.

The SN74AS298A is characterized for operation from 0°C to 70°C.



a1, a2, etc. = the level of steady-state input at A1, A2, etc.
QA0, QB0, etc. = the level of QA, QB, etc. entered on the most recent transition of CLK


  • Selects One of Two 4-Bit Data Sources and Synchronously Stores Data With System Clock
  • Applications:
    • Dual Source for Operands and Constants in Arithmetic Processor; Can Release Processor Register Files for Acquiring New Data
    • Implements Separate Registers Capable of Parallel Exchange of Contents, Yet Retains External Load Capability
    • Has Universal-Type Register for Implementing Various Shift Patterns, Including Compound Left-Right Capability
  • Package Options Include Plastic Small-Outline (D) Packages and Standard Plastic (N) 300-mil DIPs


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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)
SN74AS298A Order now Encoder
AS     4.5     5.5     4     5     125     36     11     2:1     Standard     20     -2     Catalog     0 to 70     PDIP | 16
SOIC | 16    
16PDIP: 181 mm2: 9.4 x 19.3 (PDIP | 16)
16SOIC: 59 mm2: 6 x 9.9 (SOIC | 16)    
2     5     0.75     2