MC74AC374 MC74ACT374
5-2
FACT DATA
FUNCTIONAL DESCRIPTION
The MC74AC374/74ACT374 consists of eight edge-
triggered flip-flops with individual D-type inputs and 3-state
true outputs. The buffered clock and buffered Output Enable
are common to all flip-flops. The eight flip-flops will store the
state of their individual D inputs that meet the setup and hold
time requirements on the LOW-to-HIGH Clock (CP) transition.
With the Output Enable (OE
) LOW, the contents of the eight
flip-flops are available at the outputs. When the OE
is HIGH,
the outputs go to the high impedance state. Operation of the
OE
input does not affect the state of the flip-flops.
CP D
Q Q
CP D
Q Q
CP D
Q Q
CP D
Q Q
CP D
Q Q
CP D
Q Q
CP D
Q Q
CP D
Q Q
LOGIC DIAGRAM
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
OE
CP
Please note that this diagram is provided only for the understanding of logic
operations and should not be used to estimate propagation delays.
MAXIMUM RATINGS*
Symbol Parameter Value Unit
V
CC
DC Supply Voltage (Referenced to GND) –0.5 to +7.0 V
V
in
DC Input Voltage (Referenced to GND) –0.5 to V
CC
+0.5 V
V
out
DC Output Voltage (Referenced to GND) –0.5 to V
CC
+0.5 V
I
in
DC Input Current, per Pin ±20 mA
I
out
DC Output Sink/Source Current, per Pin ±50 mA
I
CC
DC V
CC
or GND Current per Output Pin ±50 mA
T
stg
Storage Temperature –65 to +150 °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 Max Unit
T
J
Junction Temperature (PDIP) 140 °C
T
A
Operating Ambient Temperature Range –40 25 85 °C
I
OH
Output Current — High –24 mA
I
OL
Output Current — Low 24 mA
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.
