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.
Q_A0, Q_B0, etc. = the level of Q_A, Q_B, 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

• Technology Family
• AS
• Function
• Digital Multiplexer
• Configuration
• 2:1
• Number of channels (#)
• 4
• Operating temperature range (C)
• 0 to 70
• Rating
• Catalog

SN74AS298A的完整型号有：SN74AS298AD、SN74AS298AN，以下是这些产品的关键参数及官网采购报价：

SN74AS298AD，工作温度：0 to 70，封装：SOIC (D)-16，包装数量MPQ：40个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网SN74AS298AD的批量USD价格：1.973（1000+）

SN74AS298AN，工作温度：0 to 70，封装：PDIP (N)-16，包装数量MPQ：25个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：NIPDAU，TI官网SN74AS298AN的批量USD价格：2.269（1000+）

14-24-LOGIC-EVM 支持 14 到 24 引脚 PW、DB、D、DW、NS、DYY 和 DGV 封装的通用逻辑 EVM

该 EVM 设计用于支持采用 14 至 24 引脚 D、DW、DB、NS、PW、DYY 或 DGV 封装的任何逻辑器件。