MC74AC374
MC74ACT374
Octal D Type Flip Flop
with 3 State Outputs
The MC74AC374/74ACT374 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 buffered Clock (CP) and Output Enable (OE) are common
to all flip-flops.
•
•
•
•
•
•
•
•
•
Buffered Positive Edge-Triggered Clock
3-State Outputs for Bus-Oriented Applications
Outputs Source/Sink 24 mA
See MC74AC273 for Reset Version
See MC74AC377 for Clock Enable Version
See MC74AC373 for Transparent Latch Version
See MC74AC574 for Broadside Pinout Version
See MC74AC564 for Broadside Pinout Version with Inverted Outputs
′ACT374
Has TTL Compatible Inputs
VCC
20
O7
19
D7
18
D6
17
O6
16
O5
15
D5
14
D4
13
O4
12
CP
11
DW SUFFIX
CASE 751D-04
PLASTIC
OCTAL D-TYPE
FLIP-FLOP WITH
3-STATE OUTPUTS
N SUFFIX
CASE 738-03
PLASTIC
1
OE
2
O0
3
D0
4
D1
5
O1
6
O2
7
D2
8
D3
9
O3
10
GND
LOGIC SYMBOL
PIN NAMES
D0–D7
CP
OE
O0–O7
Data Inputs
Clock Pulse Input
3-State Output Enable Input
3-State Outputs
CP
OE
D0 D1 D2 D3 D4 D5 D6 D7
O0 O1 O2 O3 O4 O5 O6 O7
TRUTH TABLE
Inputs
Dn
H
L
X
CP
OE
L
L
H
Outputs
On
H
L
Z
X
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
= LOW-to-HIGH Transition
FACT DATA
5-1
MC74AC374 MC74ACT374
FUNCTIONAL DESCRIPTION
The MC74AC374/74ACT374 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 common 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) transition.
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. Operation of the
OE input does not affect the state of the flip-flops.
LOGIC DIAGRAM
D0
CP
CP
Q
D
Q
CP
Q
D
Q
CP
Q
D
Q
CP
Q
D
Q
CP
Q
D
Q
CP
Q
D
Q
CP
Q
D
Q
CP
Q
D
Q
D1
D2
D3
D4
D5
D6
D7
OE
O0
O1
O2
O3
O4
O5
O6
O7
Please note that this diagram is provided only for the understanding of logic
operations and should not be used to estimate propagation delays.
MAXIMUM RATINGS*
Symbol
VCC
Vin
Vout
Iin
Iout
ICC
Tstg
Parameter
DC Supply Voltage (Referenced to GND)
DC Input Voltage (Referenced to GND)
DC Output Voltage (Referenced to GND)
DC Input Current, per Pin
DC Output Sink/Source Current, per Pin
DC VCC or GND Current per Output Pin
Storage Temperature
Value
–0.5 to +7.0
–0.5 to VCC +0.5
–0.5 to VCC +0.5
±20
±50
±50
–65 to +150
Unit
V
V
V
mA
mA
mA
°C
* Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended
Operating Conditions.
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC
Vin, Vout
Supply Voltage
DC Input Voltage, Output Voltage (Ref. to GND)
VCC @ 3.0 V
tr, tf
Input Rise and Fall Time (Note 1)
′AC
Devices except Schmitt Inputs
VCC @ 4.5 V
VCC @ 5.5 V
tr, tf
TJ
TA
IOH
IOL
Input Rise and Fall Time (Note 2)
′ACT
Devices except Schmitt Inputs
Junction Temperature (PDIP)
Operating Ambient Temperature Range
Output Current — High
Output Current — Low
–40
25
VCC @ 4.5 V
VCC @ 5.5 V
Parameter
′AC
′ACT
Min
2.0
4.5
0
150
40
25
10
ns/V
8.0
140
85
–24
24
°C
°C
mA
mA
ns/V
Typ
5.0
5.0
Max
6.0
5.5
VCC
V
Unit
V
1. Vin from 30% to 70% VCC; see individual Data Sheets for devices that differ from the typical input rise and fall times.
2. Vin from 0.8 V to 2.0 V; see individual Data Sheets for devices that differ from the typical input rise and fall times.
FACT DATA
5-2
MC74AC374 MC74ACT374
AC CHARACTERISTICS
(For Figures and Waveforms — See Section 3)
74AC
Symbol
Parameter
VCC*
(V)
Min
fmax
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Maximum Clock
Frequency
Propagation Delay
CP to On
Propagation Delay
CP to On
Output Enable Time
Output Enable Time
Output Disable Time
Output Disable Time
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
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
TA = +25°C
CL = 50 pF
Typ
110
155
11
8.0
10
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
11.5
8.5
Max
74AC
TA = –40°C
to +85°C
CL = 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
10
13
9.5
13
9.5
14.5
12.5
12.5
10
Max
MHz
ns
ns
ns
ns
ns
ns
3-3
3-6
3-6
3-7
3-8
3-7
3-8
Unit
Fig.
No.
* Voltage Range 3.3 V is 3.3 V
±0.3
V.
Voltage Range 5.0 V is 5.0 V
±0.5
V.
AC OPERATING REQUIREMENTS
74AC
Symbol
Parameter
VCC*
(V)
Typ
ts
th
tw
Setup Time, HIGH or LOW
Dn to CP
Hold Time, HIGH or LOW
Dn to CP
CP Pulse Width
HIGH or LOW
3.3
5.0
3.3
5.0
3.3
5.0
2.0
1.0
–1.0
0
4.0
2.5
TA = +25°C
CL = 50 pF
74AC
TA = –40°C
to +85°C
CL = 50 pF
Unit
Fig.
No.
Guaranteed Minimum
5.5
4.0
1.0
1.5
5.5
4.0
6.0
4.5
1.0
1.5
6.0
4.5
ns
ns
ns
3-9
3-9
3-6
* Voltage Range 3.3 V is 3.3 V
±0.3
V.
Voltage Range 5.0 V is 5.0 V
±0.5
V.
FACT DATA
5-4
MC74AC374 MC74ACT374
DC CHARACTERISTICS
74ACT
Symbol
Parameter
VCC
(V)
TA = +25°C
Typ
VIH
VIL
VOH
Minimum High Level
Input Voltage
Maximum Low Level
Input Voltage
Minimum High Level
Output Voltage
4.5
5.5
4.5
5.5
4.5
5.5
4.5
5.5
VOL
Maximum Low Level
Output Voltage
4.5
5.5
4.5
5.5
IIN
∆I
CCT
IOZ
Maximum Input
Leakage Current
Additional Max. ICC/Input
Maximum
3-State
Current
†Minimum Dynamic
Output Current
Maximum Quiescent
Supply Current
5.5
5.5
5.5
5.5
5.5
5.5
8.0
0.6
±0.5
0.001
0.001
1.5
1.5
1.5
1.5
4.49
5.49
74ACT
TA =
–40°C to +85°C
Unit
Conditions
Guaranteed Limits
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
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
±5.0
75
–75
80
V
V
V
VOUT = 0.1 V
or VCC – 0.1 V
VOUT = 0.1 V
or VCC – 0.1 V
IOUT = –50
µA
*VIN = VIL or VIH
–24 mA
IOH
–24 mA
IOUT = 50
µA
*VIN = VIL or VIH
24 mA
IOL
24 mA
VI = VCC, GND
VI = VCC – 2.1 V
VI (OE) = VIL, VIH
VI = VCC, GND
VO = VCC, GND
VOLD = 1.65 V Max
VOHD = 3.85 V Min
VIN = VCC or GND
V
V
V
µA
mA
µA
mA
mA
µA
IOLD
IOHD
ICC
* All outputs loaded; thresholds on input associated with output under test.
† Maximum test duration 2.0 ms, one output loaded at a time.
AC CHARACTERISTICS
(For Figures and Waveforms — See Section 3)
74ACT
Symbol
Parameter
VCC*
(V)
Min
fmax
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Maximum Clock
Frequency
Propagation Delay
CP to On
Propagation Delay
CP to On
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
100
2.0
2.0
2.0
1.5
1.5
1.5
TA = +25°C
CL = 50 pF
Typ
160
8.5
8.0
8.0
8.0
8.5
7.0
10
9.5
9.5
9.0
11.5
8.5
Max
74ACT
TA = –40°C
to +85°C
CL = 50 pF
Min
90
2.0
1.5
1.5
1.5
1.0
1.0
11.5
11
10.5
10.5
12.5
10
Max
MHz
ns
ns
ns
ns
ns
ns
3-3
3-6
3-6
3-7
3-8
3-7
3-8
Unit
Fig.
No.
* Voltage Range 5.0 V is 5.0 V
±0.5
V.
FACT DATA
5-5
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