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MC74AC646_06 Datasheet, PDF (1/11 Pages) ON Semiconductor – Octal Transceiver/Register with 3−State Outputs (Non−inverting) | |||
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MC74AC646, MC74ACT646
Octal Transceiver/Register
with 3âState Outputs
(Nonâinverting)
The MC74AC646/74ACT646 consist of registered bus transceiver
circuits, with outputs, Dâtype flipâflops 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 LOWâtoâHIGH 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 RealâTime and Stored Data Transfers
⢠Choice of True and Inverting Data Paths
⢠3âState Outputs
⢠300 mil Slim Dual InâLine Package
⢠Outputs Source/Sink 24 mA
⢠â²ACT646 Has TTL Compatible Inputs
w These devices are available in Pbâfree package(s). Specifications herein
apply to both standard and Pbâfree devices. Please see our website at
www.onsemi.com for specific Pbâfree orderable part numbers, or
contact your local ON Semiconductor sales office or representative.
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.
http://onsemi.com
24
1
24
1
PDIPâ24
N SUFFIX
CASE 724
SOâ24
DW SUFFIX
CASE 751E
MARKING DIAGRAMS
PDIPâ24
MC74AC646N
AWLYYWW
MC74ACT646N
AWLYYWW
SOâ24
AC646
AWLYYWW
ACT646
AWLYYWW
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.
A
= Assembly
Location
L, WL = Wafer Lot
Y, YY = Year
W, WW = Work Week
ORDERING INFORMATION
Device
Package Shipping
MC74AC646N
PDIPâ24 15 Units/Rail
MC74ACT646N
PDIPâ24 15 Units/Rail
MC74AC646DW
MC74AC646DWR
2
MC74ACT646DW
SOICâ24 30 Units/Rail
SOICâ24 1000 Tape & Reel
SOICâ24 30 Units/Rail
MC74ACT646DWR2 SOICâ24 1000 Tape & Reel
© Semiconductor Components Industries, LLC, 2006
1
March, 2006 â Rev. 6
Publication Order Number:
MC74AC646/D
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