SN74LS399

Name: SN74LS399
Brand: TI
SKU: SN74LS399
Price: 0.954 USD

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Quadruple 2-Input Multiplexers With Storage

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Data sheet

document-pdfAcrobat Quadruple 2-Input Multiplexers With Storage datasheet

SN74LS399

ACTIVE

Data sheet

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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 x 9.4

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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