74AC374 • 74ACT374 Octal D-Type Flip-Flop with 3-STATE Outputs
November 1988
Revised November 1999
74AC374 • 74ACT374
Octal D-Type Flip-Flop with 3-STATE Outputs
General Description
The AC/ACT374 is a high-speed, low-power octal D-type
flip-flop featuring separate D-type inputs for each flip-flop
and 3-STATE outputs for bus-oriented applications. A buff-
ered Clock (CP) and Output Enable (OE) are common to
all flip-flops.
Features
s
I
CC
and I
OZ
reduced by 50%
s
Buffered positive edge-triggered clock
s
3-STATE outputs for bus-oriented applications
s
Outputs source/sink 24 mA
s
See 273 for reset version
s
See 377 for clock enable version
s
See 373 for transparent latch version
s
See 574 for broadside pinout version
s
See 564 for broadside pinout version with inverted
outputs
s
ACT374 has TTL-compatible inputs
Ordering Code:
Order Number
74AC374SC
74AC374SJ
74AC374MTC
74AC374PC
74ACT374SC
74ACT374SJ
74ACT374MSA
74ACT374MTC
74ACT374PC
Package Number
M20B
M20D
MTC20
N20A
M20B
M20D
MSA20
MTC20
N20A
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
20-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.
Connection Diagram
Pin Descriptions
Pin Names
D
0
–D
7
CP
OE
O
0
–O
7
Data Inputs
Clock Pulse Input
3-STATE Output Enable Input
3-STATE Outputs
Description
FACT is a trademark of Fairchild Semiconductor Corporation.
© 1999 Fairchild Semiconductor Corporation
DS009959
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74AC374 • 74ACT374
Logic Symbols
Functional Description
The AC/ACT374 consists of eight edge-triggered flip-flops
with individual D-type inputs and 3-STATE true outputs.
The buffered clock and buffered Output Enable are com-
mon to all flip-flops. The eight flip-flops will store the state
of their individual D inputs that meet the setup and hold
time requirements on the LOW-to-HIGH Clock (CP) transi-
tion. With the Output Enable (OE) LOW, the contents of the
eight flip-flops are available at the outputs. When the OE is
HIGH, the outputs go to the high impedance state. Opera-
tion of the OE input does not affect the state of the flip-
flops.
IEEE/IEC
Truth Table
Inputs
D
n
H
L
X
CP
Outputs
OE
L
L
H
O
n
H
L
Z
X
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Z
=
High Impedance
=
LOW-to-HIGH 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
74AC374 • 74ACT374
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)
140°C
±
50 mA
−
65°C to
+
150°C
±
50 mA
−
20 mA
+
20 mA
−
0.5V to V
CC
+
0.5V
−
20 mA
+
20 mA
−
0.5V to V
CC
+
0.5V
−
0.5V to
+
7.0V
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. Fairchild 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
(Note 4)
I
OZ
Maximum Input Leakage Current
Maximum 3-STATE Current
5.5
I
OLD
I
OHD
Minimum Dynamic
Output Current (Note 3)
5.5
5.5
5.5
4.0
±0.25
±2.5
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
I
CC
(Note 4) Maximum Quiescent Supply Current
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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74AC374 • 74ACT374
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
Output Voltage
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
OZ
I
CCT
I
OLD
I
OHD
I
CC
Maximum Input
Leakage Current
Maximum
3-STATE Current
Maximum
I
CC
/Input
Minimum Dynamic
Output Current (Note 6)
Maximum Quiescent
Supply Current
5.5
5.5
5.5
5.5
5.5
5.5
4.0
0.6
0.001
0.001
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
4.86
0.1
0.1
0.36
0.36
±0.1
±0.25
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
±2.5
1.5
75
−
75
40.0
µA
µA
mA
mA
mA
µA
V
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)
I
OUT
=
50
µA
V
IN
=
V
IL
or V
IH
V
I
OL
=
24 mA
I
OL
=
24 mA (Note 5)
V
I
=
V
CC
, GND
V
I
=
V
IL
, V
IH
V
O
=
V
CC
, GND
V
I
=
V
CC
−
2.1V
V
OLD
=
1.65V Max
V
OHD
=
3.85V Min
V
IN
=
V
CC
or GND
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
V
CC
Symbol
f
MAX
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Parameter
Maximum Clock
Frequency
Propagation Delay
CP to O
n
Propagation Delay
CP to O
n
Output Enable Time
Output Enable Time
Output Disable Time
Output Disable Time
(V)
(Note 7)
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
Note 7:
Voltage Range 3.3 is 3.3V
±
0.3V
Voltage Range 5.0 is 5.0V
±
0.5V
T
A
= +25°C
C
L
=
50 pF
Min
60
100
3.0
2.5
2.5
2.0
3.0
2.0
2.5
2.0
3.0
2.0
2.0
1.5
Typ
110
155
11.0
8.0
10.0
7.0
9.5
7.0
9.0
6.5
10.5
8.0
8.0
6.5
13.5
9.5
12.5
9.0
11.5
8.5
11.5
8.5
12.5
11.0
11.5
8.5
Max
T
A
= −40°C
to
+85°
CC
L
=
50 pF
Min
60
100
1.5
1.5
2.0
1.5
1.5
1.0
1.5
1.0
2.0
2.0
1.0
1.0
15.5
10.5
14.0
10.0
13.0
9.5
13.0
9.5
14.5
12.5
12.5
10.0
Max
MHz
ns
ns
ns
ns
ns
ns
Units
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4
74AC374 • 74ACT374
AC Operating Requirements
V
CC
Symbol
t
S
t
H
t
W
Parameter
Setup Time, HIGH or LOW
D
n
to CP
Hold Time, HIGH or LOW
D
n
to CP
CP Pulse Width,
HIGH or LOW
Note 8:
Voltage Range 3.3 is 3.3V
±
0.3V
Voltage Range 5.0 is 5.0V
±
0.5V
T
A
= +25°C
C
L
=
50 pF
Typ
2.0
1.0
−1.0
0
4.0
2.5
5.5
4.0
1.0
1.5
5.5
4.0
T
A
= −40°C
to
+85°C
C
L
=
50 pF
Guaranteed Minimum
6.0
4.5
1.0
1.5
6.0
4.5
ns
ns
ns
Units
(V)
(Note 8)
3.3
5.0
3.3
5.0
3.3
5.0
AC Electrical Characteristics
V
CC
Symbol
Parameter
(V)
(Note 9)
f
MAX
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Maximum Clock
Frequency
Propagation Delay
CP to O
n
Propagation Delay
CP to O
n
Output Enable Time
Output Enable Time
Output Disable Time
Output Disable Time
5.0
5.0
5.0
5.0
5.0
5.0
5.0
Min
100
2.0
2.0
2.0
1.5
1.5
1.5
T
A
= +25°C
C
L
=
50 pF
Typ
160
8.5
8.0
8.0
8.0
8.5
7.0
10.0
9.5
9.5
9.0
11.5
8.5
Max
T
A
= −40°C
to
+85°C
C
L
=
50 pF
Min
90
2.0
1.5
1.5
1.5
1.0
1.0
11.5
11.0
10.5
10.5
12.5
10.0
Max
MHz
ns
ns
ns
ns
ns
ns
Units
Note 9:
Voltage Range 5.0 is 5.0V
±
0.5V
AC Operating Requirements
V
CC
Symbol
Parameter
(V)
(Note 10)
t
S
t
H
t
W
Setup Time, HIGH or LOW
D
n
to CP
Hold Time, HIGH or LOW
D
n
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
1.0
0
2.5
T
A
= −40°C
to
+85°C
C
L
=
50 pF
Guaranteed Minimum
Units
5.0
5.0
5.0
5.5
1.5
5.0
5.5
1.5
5.0
ns
ns
ns
Capacitance
Symbol
C
IN
Parameter
Input Capacitance
Typ
4.5
Units
pF
V
CC
=
OPEN
Conditions
5
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