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74AC399

Fairchild Semiconductor
Part Number 74AC399
Manufacturer Fairchild Semiconductor
Description Quad 2-Port Register
Published Apr 3, 2005
Detailed Description 74AC399 • 74ACT399 Quad 2-Port Register June 1988 Revised October 2000 74AC399 • 74ACT399 Quad 2-Port Register General...
Datasheet PDF File 74AC399 PDF File

74AC399
74AC399

Overview
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.
150 Narrow 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.
300 Wide 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.
150 Narrow 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.
3mm Wide 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.
4mm Wide 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.
300 Wide www.
DataSheet4U.
com Device also available in Tape and Reel.
Specify by appending suffix letter “X” to the ordering code.
Logic Symbols Connection Diagram IEEE/IEC Pin Descriptions Pin Names S CP I0a–I0d I1a–I1d Qa–Qd Description Common Select Input Clock Pulse Input Data Inputs from Source 0 Data Inputs from Source 1 Register True Outputs FACT is a trademark of Fairchild Semiconductor Corporation.
© 2000 Fairchild Semiconductor Corporation DS009789 www.
fairchildsemi.
com 74AC399 • 74ACT399 Functional Description The AC/ACT399 is a high-speed quad 2-port register.
It selects four bits of data from either of two sources (Ports) under control of a common Select input (S).
The selected data is transferred to a 4-bit output register synchronous with the LOW-to-HIGH transition of the Clock input (CP).
The 4-bit D-type out...


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