MOTOROLA MC74ACT574DT, MC74ACT574DTEL, MC74ACT574DTR2, MC74ACT574MEL, MC74ACT574ML1 Datasheet
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5-1
FACT DATA
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
1920 18 17 16 15 14
21 3 4 5 6 7
V
CC
13
8
12
9
11
10
O0O1O2O3O4O5O6O7CP
OE
D0D1D2D3D4D5D6D7GND
PIN NAMES
D0–D7 Data Inputs
CP Clock Pulse Input
OE
3-State Output Enable Input
O0–O73-State Outputs
OCTAL D-TYPE
FLIP-FLOP WITH
3-STATE OUTPUTS
N SUFFIX
CASE 738-03
PLASTIC
DW SUFFIX
CASE 751D-04
PLASTIC
LOGIC SYMBOL
O0O1O2O3O4O5O6O
7
D0D1D2D3D4D5D6D
7
CP
OE
MC74AC57 MC74ACT574
5-2
FACT DATA
FUNCTIONAL DESCRIPTION
The MC74AC574/74ACT574 consists of eight edgetriggered 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 Internal Outputs
OE CP D Q O
n
Function
H H L NC Z Hold
H H H NC Z Hold
H L L Z Load
H H H Z Load
L L L L Data Available
L H H H Data Available
L H L NC NC No Change in Data
L H H NC NC No Change in Data
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
= LOW-to-HIGH Clock Transition
NC = No Change
LOGIC DIAGRAM
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
C D
Q
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
OE
CP
C D
Q
C D
Q
C D
Q
C D
Q
C D
Q
C D
Q
C D
Q
Please note that this diagram is provided only for the understanding of logic
operations and should not be used to estimate propagation delays.
MC74AC57 MC74ACT574
5-3
FACT DATA
MAXIMUM RATINGS*
Symbol Parameter Value Unit
V
CC
DC Supply Voltage (Referenced to GND) –0.5 to +7.0 V
V
in
DC Input Voltage (Referenced to GND) –0.5 to VCC +0.5 V
V
out
DC Output Voltage (Referenced to GND) –0.5 to VCC +0.5 V
I
in
DC Input Current, per Pin ±20 mA
I
out
DC Output Sink/Source Current, per Pin ±50 mA
I
CC
DC VCC or GND Current per Output Pin ±50 mA
T
stg
Storage Temperature –65 to +150 °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 Parameter Min Typ Max Unit
′AC 2.0 5.0 6.0
VCCSupply Voltage
′ACT 4.5 5.0 5.5
V
Vin, V
out
DC Input Voltage, Output Voltage (Ref. to GND) 0 V
CC
V
VCC @ 3.0 V 150
tr, t
f
Input Rise and Fall Time (Note 1)
′AC Devices except Schmitt Inputs
VCC @ 4.5 V 40 ns/V
r
, t
f
′AC Devices except Schmitt Inputs
VCC @ 5.5 V 25
Input Rise and Fall Time (Note 2)
VCC @ 4.5 V 10
tr, t
f
Input Rise and Fall Time (Note 2)
′ACT Devices except Schmitt Inputs
VCC @ 5.5 V 8.0
ns/V
T
J
Junction Temperature (PDIP) 140 °C
T
A
Operating Ambient Temperature Range –40 25 85 °C
I
OH
Output Current — High –24 mA
I
OL
Output Current — Low 24 mA
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.
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