74AC399 • 74ACT399 Quad 2-Port Register
June 1988
Revised October 2000
74AC399 • 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 “X” to the ordering code.
Logic Symbols
Connection Diagram
IEEE/IEC
Pin Descriptions
Pin Names
S
CP
I
0a
–I
0d
I
1a
–I
1d
Q
a
–Q
d
Description
Common Select Input
Clock Pulse Input
Data Inputs from Source 0
Data Inputs from Source 1
Register True Outputs
FACT is a trademark of Fairchild Semiconductor Corporation.
© 2000 Fairchild Semiconductor Corporation
DS009789
www.fairchildsemi.com
74AC399 • 74ACT399
Functional Description
The AC/ACT399 is a high-speed quad 2-port register. It
selects four bits of data from either of two sources (Ports)
under control of a common Select input (S). The selected
data is transferred to 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 edge-triggered. The
Data inputs (I
0x
, I
1x
) 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.
Function Table
Inputs
S
L
L
H
H
I
0
L
H
X
X
I
1
X
X
L
H
CP
Outputs
Q
L
H
L
H
Q
H
L
H
L
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
=
LOW-to-HIGH Clock Transition
Logic Diagram
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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2
74AC399 • 74ACT399
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
CC
)
DC Input Diode Current (I
IK
)
V
I
= −
0.5V
V
I
=
V
CC
+
0.5V
DC Input Voltage (V
I
)
DC Output Diode Current (I
OK
)
V
O
= −
0.5V
V
O
=
V
CC
+
0.5V
DC Output Voltage (V
O
)
DC Output Source or
Sink Current (I
O
)
DC V
CC
or Ground Current
per Output Pin (I
CC
or I
GND
)
Storage Temperature (T
STG
)
Junction Temperature (T
J
)
PDIP
−
0.5V to
+
7.0V
−
20 mA
+
20 mA
−
0.5V to V
CC
+
0.5V
−
20 mA
+
20 mA
−
0.5V to V
CC
+
0.5V
±
50 mA
±
50 mA
−
65
°
C to
+
150
°
C
+
140
°
C
Recommended Operating
Conditions
Supply Voltage (V
CC
)
AC
ACT
Input Voltage (V
I
)
Output Voltage (V
O
)
Operating Temperature (T
A
)
Minimum Input Edge Rate (
∆
V/
∆
t)
AC Devices
V
IN
from 30% to 70% of V
CC
V
CC
@ 3.3V, 4.5V, 5.5V
Minimum Input Edge Rate (
∆
V/
∆
t)
ACT Devices
V
IN
from 0.8V to 2.0V
V
CC
@ 4.5V, 5.5V
125 mV/ns
Note 1:
Absolute maximum ratings are those values beyond which damage
to the device may occur. The databook specifications should be met, with-
out exception, to ensure that the system design is reliable over its power
supply, temperature, and output/input loading variables. National does not
recommend operation of FACT circuits outside databook specifications.
2.0V to 6.0V
4.5V to 5.5V
0V to V
CC
0V to V
CC
−
40
°
C to
+
85
°
C
125 mV/ns
DC Electrical Characteristics for AC
Symbol
V
IH
Parameter
Minimum HIGH Level
Input Voltage
V
IL
Maximum LOW Level
Input Voltage
V
OH
Minimum HIGH Level
Output Voltage
V
CC
(V)
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
V
OL
Maximum LOW Level
Output Voltage
3.0
4.5
5.5
3.0
4.5
5.5
I
IN
I
OZ
Maximum Input Leakage Current
Maximum 3-STATE
Current
I
OLD
I
OHD
I
CC
Minimum Dynamic
Output Current (Note 3)
Maximum Quiescent Supply Current
5.5
5.5
5.5
5.5
4.0
±0.5
±5.0
75
−75
40.0
µA
mA
mA
µA
5.5
0.002
0.001
0.001
T
A
= +25°C
Typ
1.5
2.25
2.75
1.5
2.25
2.75
2.99
4.49
5.49
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.56
3.86
4.86
0.1
0.1
0.1
0.36
0.36
0.36
±0.1
T
A
= −40°C
to
+85°C
Guaranteed Limits
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
V
IN
=
V
IL
or V
IH
2.46
3.76
4.76
0.1
0.1
0.1
V
IN
=
V
IL
or V
IH
0.44
0.44
0.44
±1.0
µA
V
I
OL
= 12 mA
I
OL
= 24 mA
I
OL
= 24 mA (Note 2)
V
I
=
V
CC
, GND
V
I
(OE)
=
V
IL
, V
IH
V
I
=
V
CC
, GND
V
O
=
V
CC
, GND
V
OLD
=
1.65V Max
V
OHD
=
3.85V Min
V
IN
=
V
CC
or GND
V
I
OUT
=
50
µA
V
I
OH
=
−12
mA
I
OH
=
−24
mA
I
OH
=
−24
mA (Note 2)
V
I
OUT
= −50 µA
V
V
OUT
=
0.1V
or V
CC
−
0.1V
V
Units
Conditions
V
OUT
=
0.1V
or V
CC
−0.1V
Note 2:
All outputs loaded; thresholds on input associated with output under test.
Note 3:
Maximum test duration 2.0 ms, one output loaded at a time.
Note 4:
I
IN
and I
CC
@ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V V
CC
.
3
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74AC399 • 74ACT399
DC Electrical Characteristics for ACT
Symbol
V
IH
V
IL
V
OH
Parameter
Minimum HIGH Level
Input Voltage
Maximum LOW Level
Input Voltage
Minimum HIGH Level
V
CC
(V)
4.5
5.5
4.5
5.5
4.5
5.5
4.5
5.5
V
OL
Maximum LOW Level
Output Voltage
4.5
5.5
4.5
5.5
I
IN
I
CCT
I
OLD
I
OHD
I
CC
Maximum Input
Leakage Current
Maximum I
CC
/Input
Minimum Dynamic (Note 6)
Output Current
Maximum Quiescent
Supply Current
Note 6:
Maximum test duration 2.0 ms, one output loaded at a time.
T
A
=
25°C
Typ
1.5
1.5
1.5
1.5
4.49
5.49
2.0
2.0
0.8
0.8
4.4
5.4
3.86
4.85
0.001
0.001
0.1
0.1
0.36
0.36
±0.1
0.6
T
A
= −40°C
to
+85°C
Guaranteed Limits
2.0
2.0
0.8
0.8
4.4
5.4
3.76
4.76
0.1
0.1
0.44
0.44
±1.0
1.5
75
−75
Units
V
V
V
Conditions
V
OUT
=
0.1V
or V
CC
−0.1V
V
OUT
=
0.1V
or V
CC
−
0.1V
I
OUT
= −50 µA
V
IN
=
V
IL
or V
IH
V
I
OH
=
−24
mA
I
OH
=
−24
mA (Note 5)
V
I
OUT
=
50
µA
V
IN
=
V
IL
or V
IH
V
I
OL
= 24 mA
I
OL
= 24 mA (Note 5)
5.5
5.5
5.5
5.5
5.5
µA
mA
mA
mA
µA
V
I
=
V
CC
, GND
V
I
=
V
CC
−2.1V
V
OLD
=
1.65V Max
V
OHD
=
3.85V Min
V
IN
=
V
CC
or Ground
4.0
40.0
Note 5:
All outputs loaded; thresholds on input associated with output under test.
AC Electrical Characteristics for AC
V
CC
Symbol
Parameter
(V)
(Note 7)
Min
f
MAX
t
PLH
t
PHL
Input Clock Frequency
Propagation Delay
CP to Q
Propagation Delay
CP to Q
Note 7:
Voltage Range 5.0 is 5.0V
±
0.5V
T
A
= +25°C
V
CC
= +5.0V
C
L
=
50 pF
Typ
160
190
7.5
5.0
7.0
5.0
10.0
8.0
9.5
7.5
Max
140
170
4.0
2.0
3.5
2.0
T
A
= −40°C
to
+85°C
V
CC
=
5.0V
C
L
=
50 pF
Min
130
165
3.5
1.5
3.0
1.5
11.0
8.5
10.5
8.0
Max
MHz
ns
ns
Units
3.3
5.0
3.3
5.0
3.3
5.0
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4
74AC399 • 74ACT399
AC Operating Requirements for AC
V
CC
Symbol
t
S
t
H
t
S
t
H
t
W
Parameter
Setup Time, HIGH or LOW
I
n
to CP
Hold Time, HIGH or LOW
I
n
to CP
Setup Time, HIGH or LOW
S to CP
Hold Time, HIGH or LOW
S to CP
CP Pulse Width,
HIGH or LOW
Note 8:
Voltage Range 5.0 is 5.0V
±
0.5V
T
A
= +25°C
C
L
=
50 pF
Typ
2.0
1.5
0.5
0.5
3.5
2.0
0.5
0.5
3.0
2.0
4.0
3.0
1.0
1.0
5.5
4.0
1.0
1.0
4.5
3.5
T
A
= −40°C
to
+85°C
C
L
=
50 pF
Guaranteed Minimum
4.0
3.0
1.0
1.0
5.5
4.0
1.0
1.0
4.5
3.5
ns
ns
ns
ns
ns
Units
(V)
(Note 8)
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
AC Electrical Characteristics for ACT
V
CC
Symbol
Parameter
(V)
(Note 9)
Min
f
MAX
t
PLH
t
PHL
Input Clock Frequency
Propagation Delay
CP to Q
Propagation Delay
CP to Q
Note 9:
Voltage Range 5.0 is 5.0V
±
0.5V
T
A
= +25°C
V
CC
= +5.0V
C
L
=
50 pF
Typ
180
7.0
6.0
8.0
9.0
Max
165
1.5
2.0
T
A
= −40°C
to
+85°C
V
CC
=
5.0V
C
L
=
50pF
Min
160
1.5
2.0
8.5
9.5
Max
MHz
ns
ns
Units
5.0
5.0
5.0
AC Operating Requirements for ACT
V
CC
Symbol
Parameter
(V)
(Note 10)
t
S
t
H
t
S
t
H
t
W
Setup Time, HIGH or LOW
I
n
to CP
Hold Time, HIGH or LOW
I
n
to CP
Setup Time, HIGH or LOW
S to CP
Hold Time, HIGH or LOW
S to CP
CP Pulse Width,
HIGH or LOW
Note 10:
Voltage Range 5.0 is 5.0V
±
0.5V
T
A
= +25°C
C
L
=
50 pF
Typ
0.8
0
0.8
−1.0
1.7
2.5
1.0
4.0
0.5
3.5
T
A
= −40°C
to
+85°C
C
L
=
50 pF
Guaranteed Minimum
2.5
1.0
4.0
0.5
3.5
ns
ns
ns
ns
ns
Units
5.0
5.0
5.0
5.0
5.0
Capacitance
Symbol
C
IN
C
PD
Parameter
Input Capacitance
Power Dissipation Capacitance
Typ
4.5
30
Units
pF
pF
V
CC
=
OPEN
V
CC
=
5.0V
Conditions
5
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