© 1999 Fairchild Semiconductor Corporation DS009533 www.fairchildsemi.com
April 1988
Revised August 1999
7
4F398
•
74F399

Quad 2-Por
t
Regist
er
74F398 • 74F399
Quad 2-Port Register
General Description
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.
Features
a73 Select inputs from two data sources
a73 Fully positive edge-triggered operation
a73 Both true and complement outputs—74F398

Ordering Code:
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Connection Diagrams
74F398 74F399
Order Number Package Number Package Description
74F398SC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body
74F398PC N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
74F399SC M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow Body
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