2000 Fairchild Semiconductor Corporation
DS009789
www.fairchildsemi.com
June 1988
Revised October 2000
7
4
AC
3
99
74ACT399
Q
u
a
d
2-
Port
Regi
ster
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:
Device also available in Tape and Reel. Specify by appending suffix letter "X" to the ordering code.
Logic Symbols
IEEE/IEC
Connection Diagram
Pin Descriptions
FACT
is a trademark of Fairchild Semiconductor Corporation.
Order Number
Package Number
Package Description
74AC399SC
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
74AC399PC
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
74ACT399SC
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
74ACT399SJ
M16D
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74ACT399MTC
MTC16
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74ACT399PC
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Pin Names
Description
S
Common Select Input
CP
Clock Pulse Input
I
0a
I
0d
Data Inputs from Source 0
I
1a
I
1d
Data Inputs from Source 1
Q
a
Q
d
Register True Outputs
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2
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
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.
Inputs
Outputs
S
I
0
I
1
CP
Q
Q
L
L
X
L
H
L
H
X
H
L
H
X
L
L
H
H
X
H
H
L
3
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74
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74ACT399
Absolute Maximum Ratings
(Note 1)
Recommended Operating
Conditions
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.
DC Electrical Characteristics for AC
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
.
Supply Voltage (V
CC
)
-
0.5V to
+
7.0V
DC Input Diode Current (I
IK
)
V
I
=
-
0.5V
-
20 mA
V
I
=
V
CC
+
0.5V
+
20 mA
DC Input Voltage (V
I
)
-
0.5V to V
CC
+
0.5V
DC Output Diode Current (I
OK
)
V
O
=
-
0.5V
-
20 mA
V
O
=
V
CC
+
0.5V
+
20 mA
DC Output Voltage (V
O
)
-
0.5V to V
CC
+
0.5V
DC Output Source or
Sink Current (I
O
)
50 mA
DC V
CC
or Ground Current
per Output Pin (I
CC
or I
GND
)
50 mA
Storage Temperature (T
STG
)
-
65
C to
+
150
C
Junction Temperature (T
J
)
PDIP
+
140
C
Supply Voltage (V
CC
)
AC
2.0V to 6.0V
ACT
4.5V to 5.5V
Input Voltage (V
I
)
0V to V
CC
Output Voltage (V
O
)
0V to V
CC
Operating Temperature (T
A
)
-
40
C to
+
85
C
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
125 mV/ns
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
Symbol
Parameter
V
CC
T
A
=
+
25
C
T
A
=
-
40
C to
+
85
C
Units
Conditions
(V)
Typ
Guaranteed Limits
V
IH
Minimum HIGH Level
3.0
1.5
2.1
2.1
V
OUT
=
0.1V
Input Voltage
4.5
2.25
3.15
3.15
V
or V
CC
-
0.1V
5.5
2.75
3.85
3.85
V
IL
Maximum LOW Level
3.0
1.5
0.9
0.9
V
OUT
=
0.1V
Input Voltage
4.5
2.25
1.35
1.35
V
or V
CC
-
0.1V
5.5
2.75
1.65
1.65
V
OH
Minimum HIGH Level
3.0
2.99
2.9
2.9
Output Voltage
4.5
4.49
4.4
4.4
V
I
OUT
=
-
50
A
5.5
5.49
5.4
5.4
V
IN
=
V
IL
or V
IH
3.0
2.56
2.46
I
OH
=
-
12 mA
4.5
3.86
3.76
V
I
OH
=
-
24 mA
5.5
4.86
4.76
I
OH
=
-
24 mA (Note 2)
V
OL
Maximum LOW Level
3.0
0.002
0.1
0.1
Output Voltage
4.5
0.001
0.1
0.1
V
I
OUT
=
50
A
5.5
0.001
0.1
0.1
V
IN
=
V
IL
or V
IH
3.0
0.36
0.44
I
OL
= 12 mA
4.5
0.36
0.44
V
I
OL
= 24 mA
5.5
0.36
0.44
I
OL
= 24 mA (Note 2)
I
IN
Maximum Input Leakage Current
5.5
0.1
1.0
A
V
I
=
V
CC
, GND
I
OZ
Maximum 3-STATE
V
I
(OE)
=
V
IL
, V
IH
Current
5.5
0.5
5.0
A
V
I
=
V
CC
, GND
V
O
=
V
CC
, GND
I
OLD
Minimum Dynamic
5.5
75
mA
V
OLD
=
1.65V Max
I
OHD
Output Current (Note 3)
5.5
-
75
mA
V
OHD
=
3.85V Min
I
CC
Maximum Quiescent Supply Current
5.5
4.0
40.0
A
V
IN
=
V
CC
or GND
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4
74AC399
74ACT399
DC Electrical Characteristics for ACT
Note 5: All outputs loaded; thresholds on input associated with output under test.
Note 6: Maximum test duration 2.0 ms, one output loaded at a time.
AC Electrical Characteristics for AC
Note 7: Voltage Range 5.0 is 5.0V
0.5V
Symbol
Parameter
V
CC
T
A
=
25
C
T
A
=
-
40
C to
+
85
C
Units
Conditions
(V)
Typ
Guaranteed Limits
V
IH
Minimum HIGH Level
4.5
1.5
2.0
2.0
V
V
OUT
=
0.1V
Input Voltage
5.5
1.5
2.0
2.0
or V
CC
-
0.1V
V
IL
Maximum LOW Level
4.5
1.5
0.8
0.8
V
V
OUT
=
0.1V
Input Voltage
5.5
1.5
0.8
0.8
or V
CC
-
0.1V
V
OH
Minimum HIGH Level
4.5
4.49
4.4
4.4
V
I
OUT
=
-
50
A
5.5
5.49
5.4
5.4
V
IN
=
V
IL
or V
IH
4.5
3.86
3.76
V
I
OH
=
-
24 mA
5.5
4.85
4.76
I
OH
=
-
24 mA (Note 5)
V
OL
Maximum LOW Level
4.5
0.001
0.1
0.1
V
I
OUT
=
50
A
Output Voltage
5.5
0.001
0.1
0.1
V
IN
=
V
IL
or V
IH
4.5
0.36
0.44
V
I
OL
= 24 mA
5.5
0.36
0.44
I
OL
= 24 mA (Note 5)
I
IN
Maximum Input
5.5
0.1
1.0
A
V
I
=
V
CC
, GND
Leakage Current
I
CCT
Maximum I
CC
/Input
5.5
0.6
1.5
mA
V
I
=
V
CC
-
2.1V
I
OLD
Minimum Dynamic (Note 6)
5.5
75
mA
V
OLD
=
1.65V Max
I
OHD
Output Current
5.5
-
75
mA
V
OHD
=
3.85V Min
I
CC
Maximum Quiescent
5.5
4.0
40.0
A
V
IN
=
V
CC
Supply Current
or Ground
V
CC
T
A
=
+
25
C
T
A
=
-
40
C to
+
85
C
Symbol
Parameter
(V)
V
CC
=
+
5.0V
V
CC
=
5.0V
Units
(Note 7)
C
L
=
50 pF
C
L
=
50 pF
Min
Typ
Max
Min
Max
f
MAX
Input Clock Frequency
3.3
140
160
130
MHz
5.0
170
190
165
t
PLH
Propagation Delay
3.3
4.0
7.5
10.0
3.5
11.0
ns
CP to Q
5.0
2.0
5.0
8.0
1.5
8.5
t
PHL
Propagation Delay
3.3
3.5
7.0
9.5
3.0
10.5
ns
CP to Q
5.0
2.0
5.0
7.5
1.5
8.0
5
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74
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74ACT399
AC Operating Requirements for AC
Note 8: Voltage Range 5.0 is 5.0V
0.5V
AC Electrical Characteristics for ACT
Note 9: Voltage Range 5.0 is 5.0V
0.5V
AC Operating Requirements for ACT
Note 10: Voltage Range 5.0 is 5.0V
0.5V
Capacitance
V
CC
T
A
=
+
25
C
T
A
=
-
40
C to
+
85
C
Symbol
Parameter
(V)
C
L
=
50 pF
C
L
=
50 pF
Units
(Note 8)
Typ
Guaranteed Minimum
t
S
Setup Time, HIGH or LOW
3.3
2.0
4.0
4.0
ns
I
n
to CP
5.0
1.5
3.0
3.0
t
H
Hold Time, HIGH or LOW
3.3
0.5
1.0
1.0
ns
I
n
to CP
5.0
0.5
1.0
1.0
t
S
Setup Time, HIGH or LOW
3.3
3.5
5.5
5.5
ns
S to CP
5.0
2.0
4.0
4.0
t
H
Hold Time, HIGH or LOW
3.3
0.5
1.0
1.0
ns
S to CP
5.0
0.5
1.0
1.0
t
W
CP Pulse Width,
3.3
3.0
4.5
4.5
ns
HIGH or LOW
5.0
2.0
3.5
3.5
V
CC
T
A
=
+
25
C
T
A
=
-
40
C to
+
85
C
Symbol
Parameter
(V)
V
CC
=
+
5.0V
V
CC
=
5.0V
Units
(Note 9)
C
L
=
50 pF
C
L
=
50pF
Min
Typ
Max
Min
Max
f
MAX
Input Clock Frequency
5.0
165
180
160
MHz
t
PLH
Propagation Delay
5.0
1.5
7.0
8.0
1.5
8.5
ns
CP to Q
t
PHL
Propagation Delay
5.0
2.0
6.0
9.0
2.0
9.5
ns
CP to Q
V
CC
T
A
=
+
25
C
T
A
=
-
40
C to
+
85
C
Symbol
Parameter
(V)
C
L
=
50 pF
C
L
=
50 pF
Units
(Note 10)
Typ
Guaranteed Minimum
t
S
Setup Time, HIGH or LOW
5.0
0.8
2.5
2.5
ns
I
n
to CP
t
H
Hold Time, HIGH or LOW
5.0
0
1.0
1.0
ns
I
n
to CP
t
S
Setup Time, HIGH or LOW
5.0
0.8
4.0
4.0
ns
S to CP
t
H
Hold Time, HIGH or LOW
5.0
-
1.0
0.5
0.5
ns
S to CP
t
W
CP Pulse Width,
5.0
1.7
3.5
3.5
ns
HIGH or LOW
Symbol
Parameter
Typ
Units
Conditions
C
IN
Input Capacitance
4.5
pF
V
CC
=
OPEN
C
PD
Power Dissipation Capacitance
30
pF
V
CC
=
5.0V
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