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PDF MC74AC57 Data sheet ( Hoja de datos )

Número de pieza MC74AC57
Descripción (MC74AC57 / MC74AC574) OCTAL D-TYPE FLIP-FLOP WITH 3-STATE OUTPUTS
Fabricantes Motorola Semiconductors　
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MC74AC57
MC74ACT574
Octal DĆType FlipĆFlop
with 3ĆState 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 O0 O1 O2 O3 O4 O5 O6 O7 CP
20 19 18 17 16 15 14 13 12 11
1 2 3 4 5 6 7 8 9 10
OE D0 D1 D2 D3 D4 D5 D6 D7 GND
PIN NAMES
D0–D7
CP
OE
O0–O7
Data Inputs
Clock Pulse Input
3-State Output Enable Input
3-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
D0 D1 D2 D3 D4 D5 D6 D7
CP
OE
O0 O1 O2 O3 O4 O5 O6 O7
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MC74AC57 pdf
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MC74AC57 MC74ACT574
AC CHARACTERISTICS (For Figures and Waveforms — See Section 3)
74AC
Symbol
Parameter
VCC*
(V)
TA = +25°C
CL = 50 pF
fmax
tPLH
tPHL
tPZH
Maximum Clock
Frequency
Propagation Delay
CP to On
Propagation Delay
CP to On
Output Enable Time
tPZL
Output Enable Time
tPHZ
Output Disable Time
tPLZ
Output Disable Time
* Voltage Range 3.3 V is 3.3 V ±0.3 V.
Voltage Range 5.0 V is 5.0 V ±0.5 V.
Min Typ Max
3.3 75
5.0 95
3.3 3.5
5.0 2.0
13.5
9.5
3.3 3.5
5.0 2.0
3.3 2.5
5.0 2.0
12
8.5
11
8.5
3.3 3.0
5.0 1.5
3.3 4.0
5.0 2.0
3.3 2.0
5.0 1.5
10.5
8.0
12
9.5
9.0
7.5
74AC
TA = –40°C
to +85°C
CL = 50 pF
Min Max
60
85
3.5 15
2.0 11
3.5 13.5
2.0 9.5
2.5 12
2.0 9.0
3.5 11.5
2.0 9.0
4.5 13
2.0 10.5
2.5 10
1.5 8.5
Unit
MHz
ns
ns
ns
ns
ns
ns
Fig.
No.
3-3
3-6
3-6
3-7
3-8
3-7
3-8
AC OPERATING REQUIREMENTS
Symbol
Parameter
ts
Setup Time, HIGH or LOW
Dn to CP
th
Hold Time, HIGH or LOW
Dn to CP
tw
CP Pulse Width
HIGH or LOW
* Voltage Range 3.3 V is 3.3 V ±0.3 V.
Voltage Range 5.0 V is 5.0 V ±0.5 V.
74AC
74AC
VCC*
(V)
TA = +25°C
CL = 50 pF
TA = –40°C
to +85°C
CL = 50 pF
Unit
Fig.
No.
Typ Guaranteed Minimum
3.3 2.5 3.0 ns 3-9
5.0 1.5 2.0
3.3 1.5 1.5 ns 3-9
5.0 1.5 1.5
3.3 6.0 7.0 ns 3-6
5.0 4.0 5.0
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