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MC74AC646 Schematic ( PDF Datasheet ) - Motorola Semiconductors

Teilenummer MC74AC646
Beschreibung OCTAL TRANSCEIVER/REGISTER WITH 3-STATE OUTPUTS (NON-INVERTING)
Hersteller Motorola Semiconductors
Logo Motorola Semiconductors Logo 




Gesamt 9 Seiten
MC74AC646 Datasheet, Funktion
www.DataSheet4U.com
MC74AC646
MC74ACT646
Octal Transceiver/Register with
3ĆState Outputs (NonĆinverting)
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 in the following figures.
OCTAL
TRANSCEIVER/REGISTER
WITH 3-STATE OUTPUTS
(NON-INVERTING)
REAL TIME TRANSFER
A-BUS TO B-BUS
A-BUS
REG REG
B-BUS
Figure 1
REAL TIME TRANSFER
B-BUS TO A-BUS
A-BUS
REG REG
B-BUS
Figure 2
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
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
N SUFFIX
CASE 724-03
PLASTIC
DW SUFFIX
CASE 751E-04
SOIC PACKAGE
LOGIC SYMBOL
CAB A0 A1 A2 A3 A4 A5 A6 A7
SAB
DIR
CBA
SBA
G B0 B1 B2 B3 B4 B5 B6 B7
DataSheet4 U .com
FACT DATA
5-1






MC74AC646 Datasheet, Funktion
www.DataSheet4U.com
MC74AC646 MC74ACT646
AC OPERATING REQUIREMENTS
Symbol
Parameter
ts
Setup Time, HIGH or LOW
Bus to Clock
th
Hold Time, HIGH or LOW
Bus to Clock
tw
Clock Pulse Width
HIGH or LOW
* Voltage Range 3.3 V is 3.3 V ±0.3 V.
Voltage Range 5.0 V is 5.0 V ±0.5 V.
74AC
74AC
VCC*
(V)
TA = +25°C
CL = 50 pF
TA = –40°C
to +85°C
CL = 50 pF
Unit
Fig.
No.
Typ Guaranteed Minimum
3.3 2.0
5.0 1.5
5.0
4.0
5.5 ns 3-9
4.5
3.3 –1.5
5.0 –0.5
0
0.5
0 ns 3-9
1.0
3.3 2.0
5.0 2.0
3.5
3.5
4.5 ns 3-6
3.5
DC CHARACTERISTICS
74ACT
74ACT
Symbol
Parameter
VCC
(V)
TA = +25°C
TA =
–40°C to +85°C
Unit
Conditions
Typ Guaranteed Limits
VIH
VIL
VOH
Minimum High Level
Input Voltage
Maximum Low Level
Input Voltage
Minimum High Level
Output Voltage
4.5 1.5 2.0
5.5 1.5 2.0
4.5 1.5 0.8
5.5 1.5 0.8
4.5 4.49 4.4
5.5 5.49 5.4
2.0
2.0
0.8
0.8
4.4
5.4
V
VOUT = 0.1 V
or VCC – 0.1 V
V
VOUT = 0.1 V
or VCC – 0.1 V
V IOUT = –50 µA
VOL
Maximum Low Level
Output Voltage
4.5 3.86
5.5 4.86
4.5 0.001 0.1
5.5 0.001 0.1
3.76
4.76
0.1
0.1
*VIN = VIL or VIH
V
IOH
–24 mA
–24 mA
V IOUT = 50 µA
IIN Maximum Input
Leakage Current
*VIN = VIL or VIH
4.5
5.5
0.36 0.44
0.36 0.44
V
IOL
24 mA
24 mA
5.5
±0.1 ±1.0
µA VI = VCC, GND
ICCT
IOZT
IOLD
IOHD
ICC
Additional Max. ICC/Input
Maximum
3-State
Current
†Minimum Dynamic
Output Current
Maximum Quiescent
Supply Current
5.5 0.6
5.5 ±0.6
5.5
5.5
5.5 8.0
1.5
±6.0
75
–75
80
mA VI = VCC – 2.1 V
VI (OE) = VIL, VIH
µA VI = VCC, GND
VO = VCC, GND
mA VOLD = 1.65 V Max
mA VOHD = 3.85 V Min
µA VIN = VCC or GND
* All outputs loaded; thresholds on input associated with output under test.
† Maximum test duration 2.0 ms, one output loaded at a time.
DataSheet4 U .com
FACT DATA
5-6

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