PDF MC74AC646 Data sheet ( Hoja de datos )

Número de pieza	MC74AC646
Descripción	OCTAL TRANSCEIVER/REGISTER
Fabricantes	ON Semiconductor
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No Preview Available ! MC74AC646, MC74ACT646 Octal Transceiver/Register with 3-State Outputs (Non-inverting) The MC74AC646/74ACT646 consist of registered bus transceiver circuits, with outputs, D−type flip−flops and control circuitry providing multiplexed transmission of data directly from the input bus or from the internal storage registers. Data on the A or B bus will be loaded into the respective registers on the LOW−to−HIGH transition of the appropriate clock pin (CAB or CBA). The four fundamental data handling functions available are illustrated Figures 1 to 4. Features • Independent Registers for A and B Buses • Multiplexed Real−Time and Stored Data Transfers • Choice of True and Inverting Data Paths • 3−State Outputs • 300 mil Slim Dual In−Line Package • Outputs Source/Sink 24 mA • ′ACT646 Has TTL Compatible Inputs • These are Pb−Free Devices REAL TIME TRANSFER A‐BUS TO B‐BUS A‐BUS REAL TIME TRANSFER B‐BUS TO A‐BUS A‐BUS REG REG REG REG B‐BUS Figure 1. B‐BUS Figure 2. www.onsemi.com MARKING DIAGRAMS 24 1 SO−24 DW SUFFIX CASE 751E AC646 AWLYYWWG ACT646 AWLYYWWG A = Assembly Location WL = Wafer Lot YY = Year WW = Work Week G = Pb−Free Package ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 9 of this data sheet. STORAGE FROM BUS TO REGISTER A‐BUS REG REG B‐BUS Figure 3. TRANSFER FROM REGISTER TO BUS A‐BUS REG REG B‐BUS Figure 4. © Semiconductor Components Industries, LLC, 2015 March, 2015 − Rev. 7 1 Publication Order Number: MC74AC646/D 1 page MC74AC646, MC74ACT646 DC CHARACTERISTICS Symbol Parameter VIH Minimum High Level Input Voltage VIL Maximum Low Level Input Voltage VOH Minimum High Level Output Voltage 74AC 74AC VCC (V) TA = +25°C TA = −40°C to +85°C Typ Guaranteed Limits 3.0 1.5 2.1 4.5 2.25 3.15 5.5 2.75 3.85 2.1 3.15 3.85 3.0 1.5 0.9 4.5 2.25 1.35 5.5 2.75 1.65 0.9 1.35 1.65 3.0 2.99 2.9 4.5 4.49 4.4 5.5 5.49 5.4 2.9 4.4 5.4 Unit V V V VOL Maximum Low Level Output Voltage 3.0 − 2.56 4.5 − 3.86 5.5 − 4.86 3.0 0.002 0.1 4.5 0.001 0.1 5.5 0.001 0.1 2.46 3.76 4.76 0.1 0.1 0.1 V V 3.0 − 0.36 4.5 − 0.36 5.5 − 0.36 0.44 0.44 0.44 V IIN Maximum Input Leakage Current 5.5 − ±0.1 ±1.0 μA IOZT Maximum 3-State Current 5.5 − ±0.6 ±6.0 μA IOLD IOHD ICC †Minimum Dynamic Output Current Maximum Quiescent Supply Current 5.5 − − 5.5 − − 5.5 − 8.0 75 −75 80 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. Conditions 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 −12 mA IOH −24 mA −24 mA IOUT = 50 μA *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 www.onsemi.com 5 5 Page

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