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74F399SC Datasheet(PDF) 1 Page - Fairchild Semiconductor

No. de pieza 74F399SC
Descripción Electrónicos  Quad 2-Port Register
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Fabricante Electrónico  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74F399SC Datasheet(HTML) 1 Page - Fairchild Semiconductor

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© 2004 Fairchild Semiconductor Corporation
DS009533
www.fairchildsemi.com
April 1988
Revised January 2004
74F399
Quad 2-Port Register
General Description
The 74F399 is the logical equivalent of a quad 2-input mul-
tiplexer feeding into four edge-triggered flip-flops. A com-
mon Select input determines which of the two 4-bit words is
accepted. The selected data enters the flip-flops on the ris-
ing edge of the clock.
Features
s Select inputs from two data sources
s Fully positive edge-triggered operation
Ordering Code:
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbols
Connection Diagram
Unit Loading/Fan Out
Order Number
Package Number
Package Description
74F399SC
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
74F399SJ
M16D
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74F399PC
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Pin Names
Description
U.L.
Input IIH/IIL
HIGH/LOW
Output IOH/IOL
S
Common Select Input
1.0/1.0
20
µA/−0.6 mA
CP
Clock Pulse Input (Active Rising Edge)
1.0/1.0
20
µA/−0.6 mA
I0a–I0d
Data Inputs from Source 0
1.0/1.0
20
µA/−0.6 mA
I1a–I1d
Data Inputs from Source 1
1.0/1.0
20
µA/−0.6 mA
Qa–Qd
Register True Outputs
50/33.3
−1 mA/20 mA


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