MC74AC377
MC74ACT377
Octal D Flip Flop
with Clock Enable
The MC74AC377/74ACT377 has eight edge-triggered, D-type flip-flops with
individual D inputs and Q outputs. The common buffered Clock (CP) input loads
all flip-flops simultaneously, when the Clock Enable (CE) is LOW.
The register is fully edge-triggered. The state of each D input, one setup time
before the LOW-to-HIGH clock transition, is transferred to the corresponding flip-
flop’s Q output. The CE input must be stable only one setup time prior to the
LOW-to-HIGH clock transition for predictable operation.
•
•
•
•
•
•
•
•
•
Ideal for Addressable Register Applications
Clock Enable for Address and Data Synchronization Applications
Eight Edge-Triggered D Flip-Flops
Buffered Common Clock
Outputs Source/Sink 24 mA
See MC74AC273 for Master Reset Version
See MC74AC373 for Transparent Latch Version
See MC74AC374 for 3-State Version
′ACT377
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
FLIP-FLOP WITH
CLOCK ENABLE
N SUFFIX
CASE 738-03
PLASTIC
LOGIC SYMBOL
1
CE
2
O0
3
D0
4
D1
5
O1
6
O2
7
D2
8
D3
9
O3
10
GND
CP
CE
O0 O1 O2 O3 O4 O5 O6 O7
D0 D1 D2 D3 D4 D5 D6 D7
PIN NAMES
D0–D7
CE
Q0–Q7
CP
Data Inputs
Clock Enable (Active LOW)
Data Outputs
Clock Pulse Input
MODE SELECT-FUNCTION TABLE
Inputs
Operating Mode
CP
Load
′1′
Load
′0′
Hold (Do Nothing)
X
CE
L
L
H
H
Dn
H
L
X
X
Qn
H
L
No Change
No Change
Outputs
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
= LOW-to-HIGH Clock Transition
FACT DATA
5-1
MC74AC377 MC74ACT377
LOGIC DIAGRAM
D0
CE
D1
D2
D3
D4
D5
D6
D7
D
Q
CP
D
Q
CP
D
Q
CP
D
Q
CP
D
Q
CP
D
Q
CP
D
Q
CP
D
Q
CP
CP
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
MC74AC377 MC74ACT377
DC CHARACTERISTICS
74AC
Symbol
Parameter
VCC
(V)
TA = +25°C
Typ
VIH
Minimum High Level
Input Voltage
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
VOL
Maximum Low Level
Output Voltage
3.0
4.5
5.5
3.0
4.5
5.5
IIN
IOLD
IOHD
ICC
Maximum Input
Leakage Current
†Minimum Dynamic
Output Current
Maximum Quiescent
Supply Current
5.5
5.5
5.5
5.5
8.0
0.002
0.001
0.001
1.5
2.25
2.75
1.5
2.25
2.75
2.99
4.49
5.49
74AC
TA =
–40°C to +85°C
Unit
Conditions
Guaranteed Limits
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
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.46
3.76
4.76
0.1
0.1
0.1
0.44
0.44
0.44
±1.0
75
–75
80
V
VOUT = 0.1 V
or VCC – 0.1 V
VOUT = 0.1 V
or VCC – 0.1 V
IOUT = –50
µA
V
*VIN = VIL or VIH
–12 mA
IOH
–24 mA
–24 mA
IOUT = 50
µA
V
*VIN = VIL or VIH
12 mA
IOL
24 mA
24 mA
VI = VCC, GND
VOLD = 1.65 V Max
VOHD = 3.85 V Min
VIN = VCC or GND
VIL
Maximum Low Level
Input Voltage
V
VOH
Minimum High Level
Output Voltage
V
V
µA
mA
mA
µA
* All outputs loaded; thresholds on input associated with output under test.
† Maximum test duration 2.0 ms, one output loaded at a time.
Note: IIN and ICC @ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V VCC.
AC CHARACTERISTICS
(For Figures and Waveforms — See Section 3)
74AC
Symbol
Parameter
VCC*
(V)
Min
fmax
tPLH
tPHL
Maximum Clock
Frequency
Propagation Delay
CP to Qn
Propagation Delay
CP to Qn
3.3
5.0
3.3
5.0
3.3
5.0
90
140
3.0
2.0
3.5
2.5
13
9.0
13
10
TA = +25°C
CL = 50 pF
Typ
Max
74AC
TA = –40°C
to +85°C
CL = 50 pF
Min
75
125
1.5
1.5
2.0
1.5
14
10
14.5
11
Max
MHz
ns
ns
3-3
3-6
3-6
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.
FACT DATA
5-3
MC74AC377 MC74ACT377
AC OPERATING REQUIREMENTS
74AC
Symbol
Parameter
VCC*
(V)
Typ
ts
th
ts
th
tw
Setup Time, HIGH or LOW
Dn to CP
Hold Time, HIGH or LOW
Dn to CP
Setup Time, HIGH or LOW
CE to CP
Hold Time, HIGH or LOW
CE to CP
CP Pulse Width
HIGH or LOW
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
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
0
1.0
6.0
4.0
0
1.0
5.5
4.0
6.0
4.5
0
1.0
7.5
4.5
0
1.0
6.0
4.5
ns
ns
ns
ns
ns
3-9
3-9
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.
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
IOLD
IOHD
ICC
Maximum Input
Leakage Current
Additional Max. ICC/Input
†Minimum Dynamic
Output Current
Maximum Quiescent
Supply Current
5.5
5.5
5.5
5.5
5.5
8.0
0.6
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
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
VOLD = 1.65 V Max
VOHD = 3.85 V Min
VIN = VCC or GND
V
V
V
µA
mA
mA
mA
µA
* All outputs loaded; thresholds on input associated with output under test.
† Maximum test duration 2.0 ms, one output loaded at a time.
FACT DATA
5-4
MC74AC377 MC74ACT377
AC CHARACTERISTICS
(For Figures and Waveforms — See Section 3)
74ACT
Symbol
Parameter
VCC*
(V)
Min
fmax
tPLH
tPHL
Maximum Clock
Frequency
Propagation Delay
CP to Qn
Propagation Delay
CP to Qn
5.0
5.0
5.0
140
3.0
3.5
9.0
10
TA = +25°C
CL = 50 pF
Typ
Max
74ACT
TA = –40°C
to +85°C
CL = 50 pF
Min
125
2.5
2.5
10
11
Max
MHz
ns
ns
3-3
3-6
3-6
Unit
Fig.
No.
* Voltage Range 5.0 V is 5.0 V
±0.5
V.
AC OPERATING REQUIREMENTS
74ACT
Symbol
Parameter
VCC*
(V)
Typ
ts
th
ts
th
tw
Setup Time, HIGH or LOW
Dn to CP
Hold Time, HIGH or LOW
Dn to CP
Setup Time, HIGH or LOW
CE to CP
Hold Time, HIGH or LOW
CE to CP
CP Pulse Width
HIGH or LOW
5.0
5.0
5.0
5.0
5.0
TA = +25°C
CL = 50 pF
74ACT
TA = –40°C
to +85°C
CL = 50 pF
Unit
Fig.
No.
Guaranteed Minimum
4.5
1.0
4.5
1.0
4.0
5.5
1.0
5.5
1.0
4.5
ns
ns
ns
ns
ns
3-9
3-9
3-9
3-9
3-6
* Voltage Range 5.0 V is 5.0 V
±0.5
V.
CAPACITANCE
Symbol
CIN
CPD
Input Capacitance
Power Dissipation Capacitance
Parameter
Value
Typ
4.5
90
Unit
pF
pF
Test Conditions
VCC = 5.0 V
VCC = 5.0 V
FACT DATA
5-5
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