MC74AC646_15 Datasheet, PDF (1/10 Pages) ON Semiconductor – Octal Transceiver/Register with 3-State Outputs

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
1
March, 2015 − Rev. 7
Publication Order Number:
MC74AC646/D