2000 Fairchild Semiconductor Corporation
DS006113
www.fairchildsemi.com
September 1986
Revised February 2000
DM74ALS374
Octal
3-ST
A
T
E D-
T
y
p
e
Edge-
T
r
i
ggere
d
Fl
ip-
F
lo
p
DM74ALS374
Octal 3-STATE D-Type Edge-Triggered Flip-Flop
General Description
This 8-bit register features totem-pole 3-STATE outputs
designed specifically for driving highly-capacitive or rela-
tively low-impedance loads. The high-impedance state and
increased high-logic-level drive provides this register with
the capability of being connected directly to and driving the
bus lines in a bus-organized system without need for inter-
face or pull-up components. It is particularly attractive for
implementing buffer registers, I/O ports, bidirectional bus
drivers, and working registers.
The eight flip-flops of the DM74ALS374 are edge-triggered
D-type flip-flops. On the positive transition of the clock, the
Q outputs will be set to the logic states that were set up at
the D inputs.
A buffered output control input can be used to place the
eight outputs in either a normal logic state (HIGH or LOW
logic levels) or a high-impedance state. In the high-imped-
ance state the outputs neither load nor drive the bus lines
significantly.
The output control does not affect the internal operation of
the flip-flops. That is, the old data can be retained or new
data can be entered even while the outputs are OFF.
Features
s
Switching specifications at 50 pF
s
Switching specifications guaranteed over full
temperature and V
CC
range
s
Advanced oxide-isolated, ion-implanted Schottky TTL
process
s
Functionally and pin-for-pin compatible with LS TTL
counterpart
s
Improved AC performance over DM74LS374 at approxi-
mately half the power
s
3-STATE buffer-type outputs drive bus lines directly
Ordering Code:
Device also available in Tape and Reel. Specify by appending suffix letter "X" to the ordering code.
Connection Diagram
Order Number
Package Number
Package Description
DM74ALS374WM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74ALS374SJ
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74ALS374N
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
3
www.fairchildsemi.com
DM74ALS374
Absolute Maximum Ratings
(Note 1)
Note 1: The "Absolute Maximum Ratings" are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The "Recommended Operating Conditions" table will define the conditions
for actual device operation.
Note 2: This product meets application requirements of 500 temperature
cycles from
-
65
C to
+
150
C.
Recommended Operating Conditions
Note 3: The (
) arrow indicates the positive edge of the Clock is used for reference.
DC Electrical Characteristics
over recommended operating free air temperature range. All typical values are measured at V
CC
=
5V, T
A
=
25
C.
Supply Voltage
7V
Input Voltage
7V
Voltage Applied to Disabled Output
5.5V
Operating Free Air Temperature Range
0
C to
+
70
C
Storage Temperature Range (Note 2)
-
65
C to
+
150
C
Typical
JA
N Package
60.0
C/W
M Package
79.0
C/W
Symbol
Parameter
Min
Nom
Max
Units
V
CC
Supply Voltage
4.5
5
5.5
V
V
IH
HIGH Level Input Voltage
2
V
V
IL
LOW Level Input Voltage
0.8
V
I
OH
HIGH Level Output Current
-
2.6
mA
I
OL
LOW Level Output Current
24
mA
f
CLOCK
Clock Frequency
0
35
MHz
t
W
Width of Clock Pulse
HIGH
14
ns
LOW
14
ns
t
SU
Data Setup Time (Note 3)
10
ns
t
H
Data Hold Time (Note 3)
0
ns
T
A
Free Air Operating Temperature
0
70
C
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
IK
Input Clamp Voltage
V
CC
=
4.5V, I
I
=
-
18 mA
-
1.5
V
V
OH
HIGH Level Output
V
CC
=
4.5V
I
OH
=
Max
2.4
3.2
V
Voltage
V
CC
=
4.5V to 5.5V
I
OH
=
-
400
A
V
CC
-
2
V
V
OL
LOW Level Output
V
CC
=
4.5V
I
OL
=
12 mA
0.25
0.4
V
Voltage
I
OL
=
24 mA
0.35
0.5
V
I
I
Input Current @ Max.
V
CC
=
5.5V, V
IH
=
7V
0.1
mA
Input Voltage
I
IH
HIGH Level Input Current
V
CC
=
5.5V, V
IH
=
2.7V
20
A
I
IL
LOW Level Input Current
V
CC
=
5.5V, V
IL
=
0.4V
-
0.2
mA
I
O
Output Drive Current
V
CC
=
5.5V
V
O
=
2.25V
-
30
-
112
mA
I
OZH
OFF-State Output Current,
V
CC
=
5.5V, V
O
=
2.7V
20
A
HIGH Level Voltage Applied
I
OZL
OFF-State Output Current,
V
CC
=
5.5V, V
O
=
0.4V
-
20
A
LOW Level Voltage Applied
I
CC
Supply Current
V
CC
=
5.5V
Outputs HIGH
11
19
mA
Outputs Open
Outputs LOW
19
28
mA
Outputs Disabled
20
31
mA
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