HD74AC374/HD74ACT374
Octal D-Type Flip-Flops with 3-State Output
REJ03D0274–0200Z
(Previous ADE-205-395 (Z))
Rev.2.00
Jul.16.2004
Description
The HD74AC374/HD74ACT374 is a high-speed, low-power octal D-type flip-flop featuring separate D-type inputs for
each flip-flop and 3-state outputs for bus-oriented applications. A buffered Clock (CP) and Output Enable (OE) are
common to all flip-flops.
Features
•
Buffered Positive Edge-Triggered Clock
•
3-State Outputs for Bus-Oriented Applications
•
Outputs Source/Sink 24 mA
•
See HD74AC273/HD74ACT273 for Reset Version
•
See HD74AC373/HD74ACT373 for Transparent Latch Version
•
See HD74AC574/HD74ACT574 for Broadside Pinout Version
•
See HD74AC564/HD74ACT564 for Broadside
•
Pinout Version with Inverted Outputs
•
HD74ACT374 has TTL-Compatible Inputs
•
Ordering Information: Ex. HD74AC374
Part Name
HD74AC374P
HD74AC374FPEL
HD74AC374RPEL
HD74AC374TELL
Package Type
DIP-20 pin
SOP-20 pin (JEITA)
TSSOP-20 pin
Package Code Package Abbreviation Taping Abbreviation (Quantity)
DP-20N, -20NEV P
FP-20DAV
TTP-20DAV
FP
RP
T
—
EL (2,000 pcs/reel)
EL (1,000 pcs/reel)
ELL (2,000 pcs/reel)
SOP-20 pin (JEDEC) FP-20DBV
Notes: 1. Please consult the sales office for the above package availability.
2. The packages with lead-free pins are distinguished from the conventional products by adding V at the end of
the package code.
Rev.2.00, Jul.16.2004, page 1 of 9
HD74AC374/HD74ACT374
Pin Arrangement
OE
1
O
0
2
D
0
3
D
1
4
O
1
5
O
2
6
D
2
7
D
3
8
O
3
9
Gnd 10
(Top view)
20 V
CC
19 O
7
18 D
7
17 D
6
16 O
6
15 O
5
14 D
5
13 D
4
12 O
4
11 CP
Logic Symbol
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
CP
OE
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
Pin Names
D
0
– D
7
CP
OE
O
0
– O
7
Data Inputs
Clock Pulse Input
3-State Output Enable Input
3-State Outputs
Functional Description
The HD74AC374/HD74ACT374 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.
Rev.2.00, Jul.16.2004, page 2 of 9
HD74AC374/HD74ACT374
Truth Table
Inputs
D
n
H
L
X
H
L
X
Z
:
:
:
:
:
High Voltage Level
Low Voltage Level
Immaterial
High Impedance
Low-to-High Transition
X
CP
L
L
H
OE
H
L
Z
Outputs
O
n
Logic Diagram
D
0
CP
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
D
1
D
2
D
3
D
4
D
5
D
6
D
7
OE
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
Please note that this diagram is provided only for the understanding of logic operations and should not be
used to estimate propagation delays.
Absolute Maximum Ratings
Item
Supply voltage
DC input diode current
DC input voltage
DC output diode current
DC output voltage
DC output source or sink current
DC V
CC
or ground current per output pin
Storage temperature
Symbol
V
CC
I
IK
V
I
I
OK
V
O
I
O
I
CC
, I
GND
Tstg
Ratings
–0.5 to 7
–20
20
–0.5 to Vcc+0.5
–50
50
–0.5 to Vcc+0.5
±50
±50
–65 to +150
Unit
V
mA
mA
V
mA
mA
V
mA
mA
°C
V
I
= –0.5V
V
I
= Vcc+0.5V
V
O
= –0.5V
V
O
= Vcc+0.5V
Condition
Recommended Operating Conditions: HD74AC374
Item
Supply voltage
Input and Output voltage
Operating temperature
Input rise and fall time
(except Schmitt inputs)
V
IN
30% to 70% V
CC
Symbol
V
CC
V
I
, V
O
Ta
tr, tf
Ratings
2 to 6
0 to V
CC
–40 to +85
8
V
V
°C
ns/V
V
CC
= 3.0V
V
CC
= 4.5 V
V
CC
= 5.5 V
Unit
Condition
Rev.2.00, Jul.16.2004, page 3 of 9
HD74AC374/HD74ACT374
DC Characteristics: HD74AC374
Item
Sym-
bol
V
IH
Vcc
(V)
3.0
4.5
5.5
V
IL
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
V
OL
5.5
3.0
4.5
5.5
3.0
4.5
Input leakage
current
3 State current
I
IN
I
OZ
5.5
5.5
5.5
min.
2.1
3.15
3.85
—
—
—
2.9
4.4
5.4
2.58
3.94
4.94
—
—
—
—
—
—
—
—
Ta = 25°C
°
typ.
1.5
2.25
2.75
1.50
2.25
2.75
2.99
4.49
5.49
—
—
—
0.002
0.001
0.001
—
—
—
—
—
max.
—
—
—
0.9
1.35
1.65
—
—
—
—
—
—
0.1
0.1
0.1
0.32
0.32
0.32
±0.1
±0.5
Ta = –40 to
+85°C
°
min.
2.1
3.15
3.85
—
—
—
2.9
4.4
5.4
2.48
3.80
4.80
—
—
—
—
—
—
—
—
max.
—
—
—
0.9
1.35
1.65
—
—
—
—
—
—
0.1
0.1
0.1
0.37
0.37
0.37
±1.0
±5.0
µA
µA
V
V
OUT
= 0.1 V or V
CC
–0.1 V
Unit
Condition
Input Voltage
V
V
OUT
= 0.1 V or V
CC
–0.1 V
Output voltage
V
OH
V
IN
= V
IL
or V
IH
I
OUT
= –50
µA
V
IN
= V
IL
or V
IH
I
OH
= –12 mA
I
OH
= –24 mA
I
OH
= –24 mA
V
IN
= V
IL
or V
IH
I
OUT
= 50
µA
V
IN
= V
IL
or V
IH
I
OL
= 12 mA
I
OL
= 24 mA
I
OL
= 24 mA
V
IN
= V
CC
or GND
V
IN(OE)
= V
IL
, V
IH
V
IN
= V
CC
or GND
V
OUT
= V
CC
or GND
V
OLD
= 1.1 V
V
OHD
= 3.85 V
V
IN
= V
CC
or ground
Dynamic output
current*
Quiescent supply
current
I
OLD
I
OHD
I
CC
5.5
5.5
5.5
—
—
—
—
—
—
—
—
8.0
86
–75
—
—
—
80
mA
mA
µA
*Maximum
test duration 2.0 ms, one output loaded at a time.
Recommended Operating Conditions: HD74ACT374
Item
Supply voltage
Input and output voltage
Operating temperature
Input rise and fall time
(except Schmitt inputs)
V
IN
0.8 to 2.0 V
Symbol
V
CC
V
I
, V
O
Ta
tr, tf
Ratings
2 to 6
0 to V
CC
–40 to +85
8
V
V
°C
ns/V
V
CC
= 4.5V
V
CC
= 5.5V
Unit
Condition
Rev.2.00, Jul.16.2004, page 4 of 9
HD74AC374/HD74ACT374
DC Characteristics: HD74ACT374
Item
Sym-
bol
V
IH
V
IL
Output voltage
V
OH
V
CC
(V)
4.5
5.5
4.5
5.5
4.5
5.5
4.5
V
OL
5.5
4.5
5.5
4.5
Input current
3 State current
I
CC
/input current
Dynamic output
current*
Quiescent supply
current
I
IN
I
OZ
I
CCT
I
OLD
I
OHD
I
CC
5.5
5.5
5.5
5.5
5.5
5.5
5.5
min.
2.0
2.0
—
—
4.4
5.4
3.94
4.94
—
—
—
—
—
—
—
—
—
—
Ta = 25°C
°
typ.
1.5
1.5
1.5
1.5
4.49
5.49
—
—
0.001
0.001
—
—
—
—
0.6
—
—
—
max.
—
—
0.8
0.8
—
—
—
—
0.1
0.1
0.32
0.32
±0.1
±0.5
—
—
—
8.0
Ta = –40 to
+85°C
°
min.
2.0
2.0
—
—
4.4
5.4
3.80
4.80
—
—
—
—
—
—
—
86
–75
—
max.
—
—
0.8
0.8
—
—
—
—
0.1
0.1
0.37
0.37
±1.0
±5.0
1.5
—
—
80
µA
µA
mA
mA
mA
µA
V
Unit
Condition
Input voltage
V
V
OUT
= 0.1 V or V
CC
–0.1 V
V
OUT
= 0.1 V or V
CC
–0.1 V
V
IN
= V
IL
or V
IH
I
OUT
= –50
µA
V
IN
= V
IL
V
IN
= V
IL
or V
IH
I
OUT
= 50
µA
V
IN
= V
IL
V
IN
= V
CC
or GND
V
IN
= V
IL
, V
IH
V
OUT
= V
CC
or GND
V
IN
= V
CC
–2.1 V
V
OLD
= 1.1 V
V
OHD
= 3.85 V
V
IN
= V
CC
or ground
I
OL
= 24 mA
I
OL
= 24 mA
I
OH
= –24 mA
I
OH
= –24 mA
*Maximum
test duration 2.0 ms, one output loaded at a time.
AC Characteristics: HD74AC374
Ta = +25°C
C
L
= 50 pF
Min
Typ
Max
60
100
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
110
155
11.0
8.0
10.0
7.0
9.5
7.0
9.0
6.5
10.5
8.0
8.0
6.5
—
—
13.5
9.5
12.5
9.0
11.5
8.5
11.5
8.5
12.5
11.0
11.5
8.5
Ta = –40°C to +85°C
C
L
= 50 pF
Min
Max
60
100
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
—
—
15.5
10.5
14.0
10.0
13.0
9.5
13.0
9.5
14.5
12.5
12.5
10.0
MHz
ns
ns
ns
ns
ns
ns
Item
Maximum clock
frequency
Propagation delay
CP to O
n
Propagation delay
CP to O
n
Output enable time
Output enable time
Output disable time
Output disable time
Note:
Symbol
f
max
t
PLH
t
PHL
t
ZH
t
ZL
t
HZ
t
LZ
V
CC
(V)*
1
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
Unit
1. Voltage Range 3.3 is 3.3 V ± 0.3 V
Voltage Range 5.0 is 5.0 V ± 0.5 V
Rev.2.00, Jul.16.2004, page 5 of 9
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