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Giải thích chi tiết về linh kiện  Octal Transceiver/Register with 3?뭆tate Outputs (Non?뭝nverting)
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nhà sản xuất  ONSEMI [ON Semiconductor]
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© Semiconductor Components Industries, LLC, 2006
March, 2006 − Rev. 6
1
Publication Order Number:
MC74AC646/D
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.
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
w These devices are available in Pb−free package(s). Specifications herein
apply to both standard and Pb−free devices. Please see our website at
www.onsemi.com for specific Pb−free orderable part numbers, or
contact your local ON Semiconductor sales office or representative.
REAL TIME TRANSFER
A-BUS TO B-BUS
REAL TIME TRANSFER
B-BUS TO A-BUS
REG
REG
REG
REG
REG
REG
REG
REG
B-BUS
B-BUS
A-BUS
A-BUS
B-BUS
B-BUS
A-BUS
A-BUS
STORAGE
FROM BUS TO REGISTER
TRANSFER
FROM REGISTER TO BUS
Figure 1.
Figure 2.
Figure 3.
Figure 4.
http://onsemi.com
MARKING DIAGRAMS
Device
Package
Shipping
ORDERING INFORMATION
MC74AC646N
PDIP−24
15 Units/Rail
MC74AC646DW
SOIC−24
30 Units/Rail
MC74ACT646N
PDIP−24
15 Units/Rail
MC74AC646DWR
2
SOIC−24 1000 Tape & Reel
MC74ACT646DW
SOIC−24
30 Units/Rail
MC74ACT646DWR2
SOIC−24 1000 Tape & Reel
A
= Assembly
Location
L, WL
= Wafer Lot
Y, YY
= Year
W, WW = Work Week
PDIP−24
N SUFFIX
CASE 724
SO−24
DW SUFFIX
CASE 751E
ACT646
AWLYYWW
1
24
MC74ACT646N
AWLYYWW
1
24
PDIP−24
SO−24
MC74AC646N
AWLYYWW
AC646
AWLYYWW


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