74F399 Datasheet, PDF (1/7 Pages) NXP Semiconductors – Registers

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:
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
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
Pin Names
Description
S
CP
I_0a–I_0d
I_1a–I_1d
Q_a–Q_d
Common Select Input
Clock Pulse Input (Active Rising Edge)
Data Inputs from Source 0
Data Inputs from Source 1
Register True Outputs
© 2004 Fairchild Semiconductor Corporation DS009533
U.L.
HIGH/LOW
1.0/1.0
1.0/1.0
1.0/1.0
1.0/1.0
50/33.3
Input I_IH/I_IL
Output I_OH/I_OL
20 µA/−0.6 mA
20 µA/−0.6 mA
20 µA/−0.6 mA
20 µA/−0.6 mA
−1 mA/20 mA
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