MC74AC574DW中文资料
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5-1FACT DATAOctal 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 Inputs19201817161514
2134567VCC13812
911
10O0O1O2O3O4O5O6O7CP
OED0D1D2D3D
4D5D6D7GND
PIN NAMES
D0–D7 Data InputsCPClock Pulse InputOE3-State Output Enable InputO0–O73-State Outputs元器件交易网www.cecb2b.com
MC74AC57 MC74ACT574
5-2FACT DATAFUNCTIONAL DESCRIPTION
The MC74AC574/74ACT574 consists of eight edge-triggered flip-flops with individual D-type inputs and 3-statetrue outputs. The buffered clock and buffered Output Enableare common to all flip-flops. The eight flip-flops will store thestate of their individual D inputs that meet the setup and holdtime requirements on the LOW-to-HIGH Clock (CP) transition.With the Output Enable (OE) LOW, the contents of the eightflip-flops are available at the outputs. When OE is HIGH, theoutputs go to the high impedance state. Operation of the OEinput does not affect the state of the flip-flops.FUNCTION TABLE
InputsInternalOutputs
OECPDQOnFunction
HHLNCZHoldHHHNCZHoldHLLZLoadHHHZLoadLLLLData AvailableLHHHData AvailableLHLNCNCNo Change in DataLHHNCNCNo Change in Data
H = HIGH Voltage LevelL = LOW Voltage LevelX = ImmaterialZ = High Impedance = LOW-to-HIGH Clock TransitionNC = No Change
LOGIC DIAGRAM
D0D1D2D3D4D5D6D7
CD
Q
O0O1O2O3O4O5O6O7OECP
CD
QCD
QCD
QCD
QCD
QCD
QCD
Q
Please note that this diagram is provided only for the understanding of logicoperations and should not be used to estimate propagation delays.元器件交易网www.cecb2b.com
MC74AC57 MC74ACT574
5-3FACT DATAMAXIMUM RATINGS*
SymbolParameterValueUnit
VCCDC Supply Voltage (Referenced to GND)–0.5 to +7.0VVinDC Input Voltage (Referenced to GND)–0.5 to VCC +0.5V
VoutDC Output Voltage (Referenced to GND)–0.5 to VCC +0.5V
IinDC Input Current, per Pin±20mA
IoutDC Output Sink/Source Current, per Pin±50mA
ICCDC VCC or GND Current per Output Pin±50mA
TstgStorage 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 RecommendedOperating Conditions.
RECOMMENDED OPERATING CONDITIONS
SymbolParameterMinTypMaxUnit
V′AC2.05.06.0CCSupply Voltage′ACT4.55.05.5V
Vin, VoutDC Input Voltage, Output Voltage (Ref. to GND)0VCCV
tInput Rise and Fall Time (Note 1)VCC @ 3.0 V150
VCC @ 4.5 V40ns/Vr, tf′AC Devices except Schmitt InputsVCC @ 5.5 V25
tInput Rise and Fall Time (Note 2)VCC @ 4.5 V10r, tf′ACT Devices except Schmitt InputsVCC @ 5.5 V8.0ns/V
TJJunction Temperature (PDIP)140°C
TAOperating Ambient Temperature Range–402585°C
IOHOutput Current — High–24mA
IOLOutput Current — Low24mA
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.元器件交易网www.cecb2b.com
MC74AC57 MC74ACT574
5-4FACT DATADC CHARACTERISTICS
V74AC74AC
Symbol ParameterCC(V) TA = +25°CTA =–40°C to +85°CUnitConditions
TypGuaranteed Limits
VIHMinimum High Level3.01.52.12.1VOUT = 0.1 VInput Voltage4.52.253.153.15Vor VCC – 0.1 V5.52.753.853.85
VILMaximum Low Level3.01.50.90.9VOUT = 0.1 VInput Voltage4.52.251.351.35Vor VCC – 0.1 V5.52.751.651.65
VOHMinimum High Level3.02.992.92.9IOUT = –50 µAOutput Voltage4.54.494.44.4V5.55.495.45.4
*VIN = VIL or VIH3.02.562.46–12 mA4.53.863.76VIOH–24 mA5.54.864.76–24 mA
VOLMaximum Low Level3.00.0020.10.1IOUT = 50 µAOutput Voltage4.50.0010.10.1V5.50.0010.10.1
*VIN = VIL or VIH3.00.360.4412 mA4.50.360.44VIOL24 mA5.50.360.4424 mA
IINMaximum InputVLeakage Current5.5±0.1±1.0µAI = VCC, GND
IOZMaximumVI (OE) = VIL, VIH3-State5.5±0.5±5.0µAVI = VCC, GNDCurrentVO = VCC, GND
IOLD†Minimum Dynamic5.575mAVOLD = 1.65 V Max
IOHDOutput Current5.5–75mAVOHD = 3.85 V Min
ICCMaximum QuiescentASupply Current5.58.080µVIN = VCC or GND
*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.元器件交易网www.cecb2b.com
