SN54LS399

具有存储器的四路 2 输入 多路复用器

This monolithic quadruple two-input multiplexer with storage provides essentially the equivalent functional capabilities of two separate MSI functions SN54LS157/SN74LS157 and SN54LS175/SN74LS175 in a single 16-pin package.

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

Typical power dissipation is 37 milliwatts. The is characterized for operation over the full military range of -55°C to 125°C. The SN74LS399 is characterized for operation from 0°C to 70°C.

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Single-Rail Outputs on "LS399

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Selects One of Two 4-Bit Data Sources and Stores Data Synchronously with System Clock

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Applications:

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Dual Source for Operands and Constants in Arithmetic Processor; Can Release Processor Register Files for Acquiring New Data

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Implement Separate Registers Capable of Parallel Exchange of Contents Yet Retain External Load Capability

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Universal Type Register for Implementing Various Shift Patterns: Even Has Compound Left-Right Capabilities