MC74AC57
MC74ACT574
Octal D Type Flip Flop
with 3 State Outputs
The MC74AC574/74ACT574 is a high-speed, low power octal flip-flop with a
buffered common Clock (CP) and a buffered common Output Enable (OE). The
information presented to the D inputs is stored in the flip-flops on the LOW-to-HIGH
Clock (CP) transition.
The MC74AC574/74ACT574 is functionally identical to the MC74AC374/
74ACT374 except for the pinouts.
•
Inputs and Outputs on Opposite Sides of Package
Allowing Easy Interface with Microprocessors
•
Useful as Input or Output Port for Microprocessors
•
Functionally Identical to MC74AC374/74ACT374
•
3-State Outputs for Bus-Oriented Applications
•
Outputs Source/Sink 24 mA
• ′ACT574
Has TTL Compatible Inputs
VCC
20
O0
19
O1
18
O2
17
O3
16
O4
15
O5
14
O6
13
O7
12
CP
11
OCTAL D-TYPE
FLIP-FLOP WITH
3-STATE OUTPUTS
N SUFFIX
CASE 738-03
PLASTIC
DW SUFFIX
CASE 751D-04
PLASTIC
1
OE
2
D0
3
D1
4
D2
5
D3
6
D4
7
D5
8
D6
9
D7
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
D0 D1 D2 D3 D4 D5 D6 D7
CP
OE
O0 O1 O2 O3 O4 O5 O6 O7
FACT DATA
5-1
MC74AC57 MC74ACT574
FUNCTIONAL DESCRIPTION
The MC74AC574/74ACT574 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 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.
FUNCTION TABLE
Inputs
OE
H
H
H
H
L
L
L
L
CP
H
H
D
L
H
L
H
L
H
L
H
Internal
Q
NC
NC
L
H
L
H
NC
NC
Outputs
Function
On
Z
Z
Z
Z
L
H
NC
NC
Hold
Hold
Load
Load
Data Available
Data Available
No Change in Data
No Change in Data
H
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
= LOW-to-HIGH Clock Transition
NC = No Change
LOGIC DIAGRAM
D0
CP
C
Q
D
C
Q
D
C
Q
D
C
Q
D
C
Q
D
C
Q
D
C
Q
D
C
Q
D
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.
FACT DATA
5-2
MC74AC57 MC74ACT574
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
5-3
MC74AC57 MC74ACT574
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
IOZ
Maximum Input
Leakage Current
Maximum
3-State
Current
†Minimum Dynamic
Output Current
Maximum Quiescent
Supply Current
5.5
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
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
VI (OE) = VIL, VIH
VI = VCC, GND
VO = 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
5.5
5.5
5.5
5.5
±0.5
±5.0
75
–75
µA
mA
mA
µA
IOLD
IOHD
ICC
8.0
80
* 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
5-4
MC74AC57 MC74ACT574
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
75
95
3.5
2.0
3.5
2.0
2.5
2.0
3.0
1.5
4.0
2.0
2.0
1.5
13.5
9.5
12
8.5
11
8.5
10.5
8.0
12
9.5
9.0
7.5
TA = +25°C
CL = 50 pF
Typ
Max
74AC
TA = –40°C
to +85°C
CL = 50 pF
Min
60
85
3.5
2.0
3.5
2.0
2.5
2.0
3.5
2.0
4.5
2.0
2.5
1.5
15
11
13.5
9.5
12
9.0
11.5
9.0
13
10.5
10
8.5
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
TA = +25°C
CL = 50 pF
74AC
TA = –40°C
to +85°C
CL = 50 pF
Unit
Fig.
No.
Guaranteed Minimum
2.5
1.5
1.5
1.5
6.0
4.0
3.0
2.0
1.5
1.5
7.0
5.0
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
5-5
微控制器 MCU
