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SN74LS399

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Quadruple 2-Input Multiplexers With Storage

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Data sheet

SN74LS399

ACTIVE
Data sheet Order now

Product details

Technology family LS Function Digital Multiplexer Configuration 8:4,2:1 Number of channels 4 Operating temperature range (°C) 0 to 70 Rating Catalog
Technology family LS Function Digital Multiplexer Configuration 8:4,2:1 Number of channels 4 Operating temperature range (°C) 0 to 70 Rating Catalog
PDIP (N) 16 181.42 mm² (19.3 mm × 9.4 mm)
  • Single-Rail Outputs on 'LS399
  • Selects One of Two 4-Bit Data Sources and Stores Data Synchronously with System Clock
  • Applications:
    • Dual Source for Operands and Constants in Arithmetic Processor; Can Release Processor Register Files for Acquiring New Data
    • Implement Separate Registers Capable of Parallel Exchange of Contents Yet Retain External Load Capability
    • Universal Type Register for Implementing Various Shift Patterns: Even Has Compound Left-Right Capabilities

 
  • Single-Rail Outputs on 'LS399
  • Selects One of Two 4-Bit Data Sources and Stores Data Synchronously with System Clock
  • Applications:
    • Dual Source for Operands and Constants in Arithmetic Processor; Can Release Processor Register Files for Acquiring New Data
    • Implement Separate Registers Capable of Parallel Exchange of Contents Yet Retain External Load Capability
    • Universal Type Register for Implementing Various Shift Patterns: Even Has Compound Left-Right Capabilities

 

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 SN54LS399 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.

 

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 SN54LS399 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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* Data sheet Quadruple 2-Input Multiplexers With Storage datasheet Mar 1, 1988

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