MC74AC646 Datasheet PDF - Motorola


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MC74AC646
Motorola

Part Number MC74AC646
Description OCTAL TRANSCEIVER/REGISTER WITH 3-STATE OUTPUTS (NON-INVERTING)
Page 9 Pages

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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
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MC74AC646 MC74ACT646
FUNCTION TABLE
Inputs
G DIR CAB CBA SAB SBA
H X H or L H or L X X
HX
XX
Data I/O*
A0–A7
B0–B7
Input
Input
Operation or Function
Isolation
Store A and B Data
L LXXXL
L LXXXH
Output
Input
Real Time B Data to A Bus
Stored B Data to A Bus
L HXX L X
L H H or L X H X
Input
Output
Real Time A Data to B Bus
Stored A Data to B Bus
* The data output functions may be enabled or disabled by various signals at the G and DIR inputs. Data input functions are always enabled; i.e., data at the bus
pins will be stored on every LOW-to-HIGH transition of the appropriate clock inputs.
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
= LOW-to-HIGH Transition
CAB 1
SAB 2
DIR 3
A0 4
A1 5
A2 6
A3 7
A4 8
A5 9
A6 10
A7 11
GND 12
24 VCC
23 CBA
22 SBA
21 G
20 B0
19 B1
18 B2
17 B3
16 B4
15 B5
14 B6
13 B7
G
DIR
CBA
SBA
CAB
SAB
A0
LOGIC DIAGRAM
1 OF 8 CHANNELS
D0
C0
D0
C0
B0
PIN NAMES
A0–A7
B0–B7
CAB, CBA
SAB, SBA
DIR, G
Data Register Inputs
Data Register A Outputs
Data Register B Inputs
Data Register B Outputs
Clock Pulse Inputs
Transmit/Receive Inputs
Output Enable Inputs
TO 7 OTHER CHANNELS
Please note that this diagram is provided only for the understanding of logic
operations and should not be used to estimate propagation delays.
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MC74AC646 MC74ACT646
MAXIMUM RATINGS*
Symbol
Parameter
Value
Unit
VCC
Vin
Vout
Iin
Iout
ICC
Tstg
DC Supply Voltage (Referenced to GND)
DC Input Voltage (Referenced to GND)
DC Output Voltage (Referenced to GND)
DC Input Current, per Pin
DC Output Sink/Source Current, per Pin
DC VCC or GND Current per Output Pin
Storage Temperature
–0.5 to +7.0
–0.5 to VCC +0.5
–0.5 to VCC +0.5
±20
±50
±50
–65 to +150
V
V
V
mA
mA
mA
°C
* Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended
Operating Conditions.
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Min Typ
VCC
Supply Voltage
AC
ACT
2.0 5.0
4.5 5.0
Vin, Vout
tr, tf
DC Input Voltage, Output Voltage (Ref. to GND)
Input Rise and Fall Time (Note 1)
AC Devices except Schmitt Inputs
VCC @ 3.0 V
VCC @ 4.5 V
VCC @ 5.5 V
0
150
40
25
Input Rise and Fall Time (Note 2)
tr, tf ACT Devices except Schmitt Inputs
TJ Junction Temperature (PDIP)
TA Operating Ambient Temperature Range
VCC @ 4.5 V
VCC @ 5.5 V
–40
10
8.0
25
IOH Output Current — High
IOL Output Current — Low
1. Vin from 30% to 70% VCC; see individual Data Sheets for devices that differ from the typical input rise and fall times.
2. Vin from 0.8 V to 2.0 V; see individual Data Sheets for devices that differ from the typical input rise and fall times.
Max
6.0
5.5
VCC
140
85
–24
24
Unit
V
V
ns/V
ns/V
°C
°C
mA
mA
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MC74AC646 MC74ACT646
DC CHARACTERISTICS
Symbol
Parameter
VIH
VIL
VOH
Minimum High Level
Input Voltage
Maximum Low Level
Input Voltage
Minimum High Level
Output Voltage
VCC
(V)
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
74AC
74AC
TA = +25°C
TA =
–40°C to +85°C
Typ Guaranteed Limits
1.5 2.1
2.25 3.15
2.75 3.85
2.1
3.15
3.85
1.5 0.9
2.25 1.35
2.75 1.65
0.9
1.35
1.65
2.99 2.9
4.49 4.4
5.49 5.4
2.9
4.4
5.4
VOL
Maximum Low Level
Output Voltage
3.0 2.56
4.5 3.86
5.5 4.86
3.0 0.002 0.1
4.5 0.001 0.1
5.5 0.001 0.1
2.46
3.76
4.76
0.1
0.1
0.1
IIN Maximum Input
Leakage Current
3.0 0.36 0.44
4.5 0.36 0.44
5.5 0.36 0.44
5.5 ±0.1 ±1.0
IOZT
Maximum
3-State
Current
5.5 ±0.6 ±6.0
IOLD
IOHD
ICC
†Minimum Dynamic
Output Current
Maximum Quiescent
Supply Current
5.5 75
5.5 –75
5.5 8.0 80
* All outputs loaded; thresholds on input associated with output under test.
† Maximum test duration 2.0 ms, one output loaded at a time.
Note: IIN and ICC @ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V VCC.
Unit
V
V
V
V
V
V
µA
µA
mA
mA
µA
Conditions
VOUT = 0.1 V
or VCC – 0.1 V
VOUT = 0.1 V
or VCC – 0.1 V
IOUT = –50 µA
*VIN = VIL or VIH
–12 mA
IOH –24 mA
–24 mA
IOUT = 50 µA
*VIN = VIL or VIH
12 mA
IOL 24 mA
24 mA
VI = VCC, GND
VI (OE) = VIL, VIH
VI = VCC, GND
VO = VCC, GND
VOLD = 1.65 V Max
VOHD = 3.85 V Min
VIN = VCC or GND
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