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74AC399 - Quad 2-Port Register

Download the 74AC399 datasheet PDF. This datasheet also covers the 74AC variant, as both devices belong to the same quad 2-port register family and are provided as variant models within a single manufacturer datasheet.

General Description

The AC/ACT399 is the logical equivalent of a quad 2-input multiplexer feeding into four edge-triggered flip-flops.

A common Select input determines which of the two 4-bit words is accepted.

The selected data enters the flip-flop on the rising edge of the clock.

Key Features

  • s ICC reduced by 50% s Select inputs from two data sources s Fully positive edge-triggered operation s Outputs source/sink 24 mA s AC/ACT399 has TTL-compatible inputs Ordering Code: Order Number 74AC399SC 74AC399PC 74ACT399SC 74ACT399SJ 74ACT399MTC 74ACT399PC Package Number M16A N16E M16A M16D MTC16 N16E Package.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (74AC-399.pdf) that lists specifications for multiple related part numbers.

📁 Similar Datasheet

Part Number Description Manufacturer
74AC398 Quad 2 Port Register Fairchild
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74AC373 OCTAL D-TYPE LATCH STMicroelectronics
74AC374 Octal D-Type Flip-Flop STMicroelectronics

Other Datasheets by Fairchild (onsemi)

Part Number Description
74AC32 Quad 2-Input OR Gate
74AC373 Octal Transparent Latch
74AC374 Octal D-Type Flip-Flop
74AC377 Octal D-Type Flip-Flop
74AC00 Quad 2-Input NAND Gate

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
74AC399 • 74ACT399 Quad 2-Port Register June 1988 Revised October 2000 74AC399 • 74ACT399 Quad 2-Port Register General Description The AC/ACT399 is the logical equivalent of a quad 2-input multiplexer feeding into four edge-triggered flip-flops. A common Select input determines which of the two 4-bit words is accepted. The selected data enters the flip-flop on the rising edge of the clock. Features s ICC reduced by 50% s Select inputs from two data sources s Fully positive edge-triggered operation s Outputs source/sink 24 mA s AC/ACT399 has TTL-compatible inputs Ordering Code: Order Number 74AC399SC 74AC399PC 74ACT399SC 74ACT399SJ 74ACT399MTC 74ACT399PC Package Number M16A N16E M16A M16D MTC16 N16E Package Description 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.