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Электронный компонент: DM74S244

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2000 Fairchild Semiconductor Corporation
DS006478
www.fairchildsemi.com
August 1986
Revised May 2000
DM74S240 D
M
74S241

D
M
74S24
4
Oct
a
l 3-ST
A
T
E
Buf
f
er
/Li
n
e Driv
er/
L
ine Recei
ver
DM74S240 DM74S241 DM74S244
Octal 3-STATE Buffer/Line Driver/Line Receiver
General Description
These buffers/line drivers are designed to improve both the
performance and PC board density of 3-STATE buffers/
drivers employed as memory-address drivers, clock driv-
ers, and bus-oriented transmitters/receivers. Featuring 400
mV of hysteresis at each low current PNP data line input,
they provide improved noise rejection and high fanout out-
puts, and can be used to drive terminated lines down to
133
.
Features
s
3-STATE outputs drive bus lines directly
s
PNP inputs reduce DC loading on bus lines
s
Hysteresis at data inputs improves noise margins
s
Typical I
OL
(sink current)
64 mA
s
Typical I
OH
(source current)
-
15 mA
s
Typical propagation delay times
Inverting 4.5
ns
Noninverting 6
ns
s
Typical enable/disable times 9 ns
s
Typical power dissipation (enabled)
Inverting 450
mW
Noninverting 538
mW
Ordering Code:
Connection Diagrams
DM74S240N
DM74S241N
DM74S244N
Order Number
Package Number
Package Description
DM74S240N
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
DM74S241N
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
DM74S244N
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
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2
DM74S240

DM74S241

D
M
74S244
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.
Recommended Operating Conditions
Electrical Characteristics
over recommended operating free-air temperature range (unless otherwise noted)
Note 2: All typical values are at V
CC
=
5V, T
A
=
25
C.
Note 3: Not more than one output should be shorted at a time and duration should not exceed one second.
Supply Voltage
7V
Input Voltage
5.5V
Operating Free Air Temperature Range
0
C to
+
70
C
Storage Temperature Range
-
65
C to
+
150
C
Symbol
Parameter
Min
Typ
Max
Units
V
CC
Supply Voltage
4.75
5
5.25
V
V
IH
HIGH Level Input Voltage
2
V
V
IL
LOW Level Input Voltage
0.8
V
I
OH
HIGH Level Output Current
-
15
mA
I
OL
LOW Level Output Current
64
mA
T
A
Free Air Operating Temperature
0
70
C
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 2)
V
I
Input Clamp Voltage
V
CC
=
Min, I
I
=
-
18 mA
-
1.2
V
H
ys
Hysteresis (V
T
+
-
V
T
-
)
V
CC
=
Min
0.2
0.4
V
(Data Inputs Only)
V
OH
HIGH Level
V
CC
=
4.75V, V
IH
=
2V
2.7
V
Output Voltage
V
IL
=
0.8V, I
OH
=
-
1 mA
V
CC
=
Min, V
IH
=
2V
2.4
3.4
V
IL
=
0.8V, I
OH
=
-
3 mA
V
CC
=
Min, V
IH
=
2V
2
V
IL
=
0.5V, I
OH
=
Max
V
OL
LOW Level
V
CC
=
Min
I
OL
=
Max
0.55
V
Output Voltage
V
IL
=
0.8V, V
IH
=
2V
I
OZH
Off-State Output Current,
V
CC
=
Max
V
O
=
2.4V
50
A
HIGH Level Voltage Applied
V
IL
=
0.8V
I
OZL
Off-State Output Current,
V
IH
=
2V
V
O
=
0.5V
-
50
A
LOW Level Voltage Applied
I
I
Input Current at Maximum
V
CC
=
Max
V
I
=
5.5V
1
mA
Input Voltage
I
IH
HIGH Level Input Current
V
CC
=
Max
V
I
=
2.7V
50
A
I
IL
LOW Level Input Current
V
CC
=
Max
V
I
=
0.5V
Any A
-
400
A
Any G
-
2
mA
I
OS
Short Circuit Output Current
V
CC
=
Max (Note 3)
-
50
-
225
mA
I
CC
Supply
Outputs HIGH
DM74S240
80
135
mA
Current
DM74S241, DM74244
95
160
Outputs LOW
DM74S240
100
150
DM74S241, DM74244
120
180
Outputs Disabled
DM74S240
100
150
DM74S241, DM74S244
120
180
3
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DM74S240

D
M
74S241


D
M
74S24
4
Switching Characteristics
V
CC
=
5V, T
A
=
25
C
Symbol
Parameter
Conditions
Min
Max
Units
t
PLH
Propagation Delay Time
C
L
=
45 pF
DM74S240
2
7
ns
LOW-to-HIGH Level Output
R
L
=
90
DM74S241, DM74244
2
9
t
PHL
Propagation Delay Time
C
L
=
45 pF
DM74S240
2
7
ns
HIGH-to-LOW Level Output
R
L
=
90
DM74S241, DM74244
2
9
t
PZL
Output Enable Time to
C
L
=
45 pF
DM74S240
3
15
ns
LOW Level
R
L
=
90
DM74S241, DM74244
3
15
t
PZH
Output Enable Time to
C
L
=
45 pF
DM74S240
2
10
ns
HIGH Level
R
L
=
90
DM74S241, DM74244
3
12
t
PLZ
Output Disable Time
C
L
=
5 pF
DM74S240
4
15
ns
from Low Level
R
L
=
90
DM74S241, DM74244
2
15
t
PHZ
Output Disable Time
C
L
=
5 pF
DM74S240
2
9
ns
from High Level
R
L
=
90
DM74S241, DM74244
2
9
t
PLH
Propagation Delay Time
C
L
=
150 pF
DM74S240
3
10
ns
LOW-to-HIGH Level Output
R
L
=
90
DM74S241, DM74244
4
12
t
PHL
Propagation Delay Time
C
L
=
150 pF
DM74S240
3
10
ns
HIGH-to-LOW Level Output
R
L
=
90
DM74S241, DM74244
4
12
t
PZL
Output Enable Time to
C
L
=
150 pF
DM74S240
6
21
ns
LOW Level
R
L
=
90
DM74S241, DM74244
6
21
t
PZH
Output Enable Time to
C
L
=
150 pF
DM74S240
4
12
ns
HIGH Level
R
L
=
90
DM74S241, DM74244
4
15
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4
DM
7
4
S240

DM74S241

DM74S244 O
c
t
a
l

3-
ST
A
T
E Buff
er/
L
ine Dri
ver/
L
i
ne
Recei
ver
Physical Dimensions
inches (millimeters) unless otherwise noted
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Package Number N20A
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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