Details, datasheet, quote on part number: 74F399SJX
TitleBipolar->F Family
DescriptionQuad 2-Port Register
CompanyFairchild Semiconductor
DatasheetDownload 74F399SJX datasheet
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Features, Applications

The 74F398 and 74F399 are the logical equivalents 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-flops on the rising edge of the clock. The 74F399 is the 16-pin version of the 74F398, with only the Q outputs of the flip-flops available.


s Select inputs from two data sources s Fully positive edge-triggered operation s Both true and complement outputs--74F398

Order Number 74F399SJ 74F399PC Package Number M16D N16E Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 20-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 Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

Device also available in Tape and Reel. Specify by appending suffix letter "X" to the ordering code.

U.L. Pin Names I0aI0d I1aI1d QaQd Description HIGH/LOW Common Select Input Clock Pulse Input (Active Rising Edge) Data Inputs from Source 0 Data Inputs from Source 1 Register True Outputs Register Complementary Outputs (74F398) Input IIH/IIL Output IOH/IOL A/-0.6 mA

The 74F398 and 74F399 are high-speed quad 2-port registers. They select four bits of data from either of two sources (Ports) under control of a common Select input (S). The selected data is transferred a 4-bit output register synchronous with the LOW-to-HIGH transition of the Clock input (CP). The 4-bit D-type output register is fully edgetriggered. The Data inputs (I0x, I1x) and Select input (S) must be stable only a setup time prior to and hold time after the LOW-to-HIGH transition of the Clock input for predictable operation. The 74F398 has both Q and Q outputs.

H = HIGH Voltage Level L = LOW Voltage Level h = HIGH Voltage Level one setup time prior to the LOW-to-HIGH clock transition I = LOW Voltage Level one setup time prior to the LOW-to-HIGH clock transition X = Immaterial Note 1: 74F398 only

*F398 Only Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.


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