MC74AC646 Datasheet, PDF (1/12 Pages) Motorola, Inc – OCTAL TRANSCEIVER/REGISTER WITH 3-STATE OUTPUTS (NON-INVERTING)

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
REAL TIME TRANSFER
AĆBUS TO BĆBUS
AĆBUS
REAL TIME TRANSFER
BĆBUS TO AĆBUS
AĆBUS
REG
REG
REG
REG
BĆBUS
Figure 1.
BĆBUS
Figure 2.
STORAGE
FROM BUS TO REGISTER
AĆBUS
REG
REG
BĆBUS
Figure 3.
TRANSFER
FROM REGISTER TO BUS
AĆBUS
REG
REG
BĆBUS
Figure 4.
http://onsemi.com
24
1
24
1
PDIP–24
N SUFFIX
CASE 724
SO–24
DW SUFFIX
CASE 751E
MARKING DIAGRAMS
PDIP–24
MC74AC646N
AWLYYWW
MC74ACT646N
AWLYYWW
SO–24
AC646
AWLYYWW
ACT646
AWLYYWW
A = Assembly Location
L, WL = Wafer Lot
Y, YY = Year
W, WW = Work Week
ORDERING INFORMATION
Device
Package Shipping
MC74AC646N
PDIP–24 15 Units/Rail
MC74ACT646N
PDIP–24 15 Units/Rail
MC74AC646DW
MC74AC646DWR2
SOIC–24 30 Units/Rail
SOIC–24 1000 Tape & Reel
MC74ACT646DW SOIC–24 30 Units/Rail
MC74ACT646DWR2 SOIC–24 1000 Tape & Reel
© Semiconductor Components Industries, LLC, 2001
1
May, 2001 – Rev. 5
Publication Order Number:
MC74AC646/D