MC74AC273
MC74ACT273
Octal D Flip Flop
The MC74AC273/74ACT273 has eight edge-triggered D-type flip-flops with
individual D inputs and Q outputs. The common buffered Clock (CP) and Master
Reset (MR) inputs load and reset (clear) all flip-flops simultaneously.
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.
All outputs will be forced LOW independently of Clock or Data inputs by a LOW
voltage level on the MR input. The device is useful for applications where the true
output only is required and the Clock and Master Reset are common to all storage
elements.
•
•
•
•
•
•
•
•
•
Ideal Buffer for MOS Microprocessor or Memory
Eight Edge-Triggered D Flip-Flops
Buffered Common Clock
Buffered, Asynchronous Master Reset
See MC74AC377 for Clock Enable Version
See MC74AC373 for Transparent Latch Version
See MC74AC374 for 3-State Version
Outputs Source/Sink 24 mA
′ACT273
Has TTL Compatible Inputs
VCC
20
Q7
19
D7
18
D6
17
Q6
16
Q5
15
D5
14
D4
13
Q4
12
CP
11
OCTAL D FLIP-FLOP
N SUFFIX
CASE 738-03
PLASTIC
DW SUFFIX
CASE 751D-04
PLASTIC
LOGIC SYMBOL
1
MR
2
Q0
3
D0
4
D1
5
Q1
6
Q2
7
D2
8
D3
9
Q3
10
GND
D0 D1 D2 D3 D4 D5 D6 D7
CP
MR
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
PIN NAMES
D0–D7
MR
CP
Q0–Q7
Data Inputs
Master Reset
Clock Pulse Input
Data Outputs
FACT DATA
5-1
MC74AC273 MC74ACT273
LOGIC DIAGRAM
D0
CP
D1
D2
D3
D4
D5
D6
D7
D
Q
CP
RD
D
Q
CP
RD
D
Q
CP
RD
D
Q
CP
RD
D
Q
CP
RD
D
Q
CP
RD
D
Q
CP
RD
D
Q
CP
RD
MR
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.
MODE SELECT-FUNCTION TABLE
Inputs
Operating Mode
MR
Reset (Clear)
Load
′1′
Load
′0′
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
= LOW-to-HIGH Clock Transition
Outputs
Dn
X
H
L
Qn
L
H
L
CP
X
L
H
H
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.
FACT DATA
5-2
MC74AC273 MC74ACT273
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.
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.
FACT DATA
5-3
MC74AC273 MC74ACT273
AC CHARACTERISTICS
(For Figures and Waveforms — See Section 3)
74AC
Symbol
Parameter
VCC*
(V)
Min
fmax
tPLH
tPHL
tPHL
Maximum Clock
Frequency
Propagation Delay
Clock to Output
Propagation Delay
Clock to Output
Propagation Delay
MR to Output
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
90
140
4.0
3.0
4.0
3.0
4.0
3.0
TA = +25°C
CL = 50 pF
Typ
125
175
7.0
5.5
7.0
5.0
7.0
5.0
12.5
9.0
13.0
10.0
13.0
10.0
Max
74AC
TA = –40°C
to +85°C
CL = 50 pF
Min
75
125
3.0
2.5
3.5
2.5
3.5
2.5
14.0
10.0
14.5
11.0
14.0
10.5
Max
Mhz
ns
ns
ns
3-3
3-6
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.
AC OPERATING REQUIREMENTS
74AC
Symbol
Parameter
VCC*
(V)
Typ
ts
th
tw
tw
trec
Setup Time, HIGH or LOW
Data to CP
Hold Time, HIGH or LOW
Data to CP
Clock Pulse Width
HIGH or LOW
MR Pulse Width
HIGH or LOW
Recovery Time
MR to CP
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.5
2.5
–2.0
–1.0
3.5
2.5
2.0
1.5
1.5
1.0
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
5.5
4.0
5.5
4.0
3.5
2.0
6.0
4.5
0
1.0
6.0
4.5
6.0
4.5
4.5
3.0
ns
ns
ns
ns
ns
3-9
3-9
3-6
3-6
3-9
* 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
MC74AC273 MC74ACT273
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.
AC CHARACTERISTICS
(For Figures and Waveforms — See Section 3)
74ACT
Symbol
Parameter
VCC*
(V)
Min
fmax
tPHL
tPLH
tPHL
Maximum Clock
Frequency
Propagation Delay
Clock to Output
Propagation Delay
Clock to Output
Propagation Delay
MR to Output
5.0
5.0
5.0
5.0
125
3.0
3.0
3.0
TA = +25°C
CL = 50 pF
Typ
200
6.0
6.5
7.0
10
11
11
Max
74ACT
TA = –40°C
to +85°C
CL = 50 pF
Min
125
2.5
2.5
2.5
11.0
12.0
11.5
Max
MHz
ns
ns
ns
3-3
3-6
3-6
3-6
Unit
Fig.
No.
* Voltage Range 5.0 V is 5.0 V
±0.5
V.
FACT DATA
5-5
京公网安备 11010802033920号
EEWORLD
