74AC399 鈥?74ACT399 Quad 2-Port Register
June 1988
Revised October 2000
74AC399 鈥?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
I
CC
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
Device also available in Tape and Reel. Specify by appending suffix letter 鈥淴鈥?to the ordering code.
Logic Symbols
Connection Diagram
IEEE/IEC
Pin Descriptions
Pin Names
S
CP
I
0a
鈥揑
0d
I
1a
鈥揑
1d
Q
a
鈥換
d
Description
Common Select Input
Clock Pulse Input
Data Inputs from Source 0
Data Inputs from Source 1
Register True Outputs
FACT錚?is a trademark of Fairchild Semiconductor Corporation.
漏 2000 Fairchild Semiconductor Corporation
DS009789
www.fairchildsemi.com