MC74AC646DWR2G Datasheet, PDF (3/11 Pages) ON Semiconductor – Octal Transceiver/Register with 3−State Outputs (Non−inverting)

MC74AC646, MC74ACT646
FUNCTION TABLE
Inputs
G
DIR CAB CBA SAB SBA
Data I/O*
A₀−A₇
B₀−B₇
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 LOW−to−HIGH transition of the appropriate clock inputs.
NOTE: H = HIGH Voltage Level; L = LOW Voltage Level; X = Immaterial; = LOW−to−HIGH Transition
MAXIMUM RATINGS*
Symbol
Parameter
Value
Unit
V_CC
DC Supply Voltage (Referenced to GND)
V_in
DC Input Voltage (Referenced to GND)
V_out
DC Output Voltage (Referenced to GND)
I_in
DC Input Current, per Pin
I_out
DC Output Sink/Source Current, per Pin
I_CC
DC V_CC or GND Current per Output Pin
T_stg
Storage Temperature
−0.5 to +7.0
V
−0.5 to V_CC +0.5
V
−0.5 to V_CC +0.5
V
±20
mA
±50
mA
±50
mA
−65 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
V_CC
Supply Voltage
′AC
′ACT
2.0
5.0
6.0
4.5
5.0
5.5
V_in, V_out
DC Input Voltage, Output Voltage (Ref. to GND)
0
−
V_CC
t_r, t_f
Input Rise and Fall Time (Note 1)
′AC Devices except Schmitt Inputs
V_CC @ 3.0 V
−
150
−
V_CC @ 4.5 V
−
40
−
V_CC @ 5.5 V
−
25
−
t_r, t_f
Input Rise and Fall Time (Note 2)
′ACT Devices except Schmitt Inputs
V_CC @ 4.5 V
−
10
−
V_CC @ 5.5 V
−
8.0
−
T_J
Junction Temperature (PDIP)
−
−
140
T_A
Operating Ambient Temperature Range
−40
25
85
I_OH
Output Current − High
−
−
−24
I_OL
Output Current − Low
−
−
24
1. V_in from 30% to 70% V_CC; see individual Data Sheets for devices that differ from the typical input rise and fall times.
2. V_in 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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