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MC74AC646_06 Datasheet, PDF (3/11 Pages) ON Semiconductor – Octal Transceiver/Register with 3−State Outputs (Non−inverting) | |||
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MC74AC646, MC74ACT646
FUNCTION TABLE
Inputs
G
DIR CAB CBA SAB SBA
Data I/O*
A0âA7
B0âB7
Operation or Function
H
X
H or L H or L
X
X
H
X
X
X
Input
Input
Isolation
Store A and B Data
L
L
L
L
X
X
X
L
X
X
X
H
Output
Input
Real Time B Data to A Bus
Stored B Data to A Bus
L
H
X
X
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 LOWâtoâHIGH transition of the appropriate clock inputs.
NOTE: H = HIGH Voltage Level; L = LOW Voltage Level; X = Immaterial; = LOWâtoâHIGH Transition
MAXIMUM RATINGS*
Symbol
Parameter
Value
Unit
VCC
DC Supply Voltage (Referenced to GND)
Vin
DC Input Voltage (Referenced to GND)
Vout
DC Output Voltage (Referenced to GND)
Iin
DC Input Current, per Pin
Iout
DC Output Sink/Source Current, per Pin
ICC
DC VCC or GND Current per Output Pin
Tstg
Storage Temperature
â0.5 to +7.0
V
â0.5 to VCC +0.5
V
â0.5 to VCC +0.5
V
±20
mA
±50
mA
±50
mA
â65 to +150
°C
*Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recom-
mended Operating Conditions.
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Min
Typ
Max
VCC
Supply Voltage
â²AC
â²ACT
2.0
5.0
6.0
4.5
5.0
5.5
Vin, Vout
DC Input Voltage, Output Voltage (Ref. to GND)
0
â
VCC
tr, tf
Input Rise and Fall Time (Note 1)
â²AC Devices except Schmitt Inputs
VCC @ 3.0 V
â
150
â
VCC @ 4.5 V
â
40
â
VCC @ 5.5 V
â
25
â
tr, tf
Input Rise and Fall Time (Note 2)
â²ACT Devices except Schmitt Inputs
VCC @ 4.5 V
â
10
â
VCC @ 5.5 V
â
8.0
â
TJ
Junction Temperature (PDIP)
â
â
140
TA
Operating Ambient Temperature Range
â40
25
85
IOH
Output Current â High
â
â
â24
IOL
Output Current â Low
â
â
24
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.
Unit
V
V
ns/V
ns/V
°C
°C
mA
mA
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