DM74LS244N [FAIRCHILD]
Octal 3-STATE Buffer/Line Driver/Line Receiver; 八路三态缓冲器/线路驱动器/线接收器
| 型号： | DM74LS244N |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | Octal 3-STATE Buffer/Line Driver/Line Receiver |
| 文件： | 总6页 (文件大小：69K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
August 1986
Revised March 2000
DM74LS244
Octal 3-STATE Buffer/Line Driver/Line Receiver
General Description
Features
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
133Ω.
■ 3-STATE outputs drive bus lines directly
■ PNP inputs reduce DC loading on bus lines
■ Hysteresis at data inputs improves noise margins
■ Typical IOL (sink current)
24 mA
■ Typical IOH (source current) −15 mA
■ Typical propagation delay times
Inverting
10.5 ns
12 ns
Noninverting
■ Typical enable/disable time
18 ns
■ Typical power dissipation (enabled)
Inverting
130 mW
135 mW
Noninverting
Ordering Code:
Order Number Package Number
Package Description
DM74LS244WM
DM74LS244SJ
DM74LS244N
M20B
M20D
N20A
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
Inputs
Output
G
L
A
L
Y
L
L
H
X
H
Z
H
L = LOW Logic Level
H = HIGH Logic Level
X = Either LOW or HIGH Logic Level
Z = High Impedance
© 2000 Fairchild Semiconductor Corporation
DS008442
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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.
Supply Voltage
Input Voltage
7V
7V
Operating Free Air Temperature Range
Storage Temperature Range
0°C to +70°C
−65°C to +150°C
Recommended Operating Conditions
Symbol
VCC
Parameter
Min
4.75
2
Nom
Max
Units
V
Supply Voltage
5
5.25
VIH
VIL
IOH
IOL
TA
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Current
LOW Level Output Current
Free Air Operating Temperature
V
0.8
−15
24
V
mA
mA
°C
0
70
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions
Input Clamp Voltage = Min, I = −18 mA
Min
Typ
Max
Units
(Note 2)
V
V
V
−1.5
V
V
I
CC
CC
I
HYS
Hysteresis (V − V
T+
)
= Min
0.2
0.4
T−
Data Inputs Only
V
HIGH Level Output Voltage
V
V
V
V
V
V
V
V
V
V
V
V
= Min, V = Min
CC IH
OH
2.7
2.4
2
= Max, I = −1 mA
IL
OH
= Min, V = Min
CC
IH
3.4
V
= Max, I = −3 mA
IL
OH
= Min, V = Min
CC
IH
= 0.5V, I = Max
IL
OH
V
LOW Level Output Voltage
= Min
I
I
= 12 mA
= Max
0.4
0.5
OL
CC
OL
OL
= Max
= Min
V
IL
IH
CC
I
I
I
Off-State Output Current,
HIGH Level Voltage Applied
Off-State Output Current,
LOW Level Voltage Applied
Input Current at Maximum
Input Voltage
= Max
V
V
= 2.7V
= 0.4V
20
−20
0.1
µA
µA
mA
OZH
OZL
I
O
O
= Max
= Min
IL
IH
V
= Max
V = 7V
I
CC
I
I
I
I
HIGH Level Input Current
LOW Level Input Current
Short Circuit Output Current
Supply Current
V
V
V
V
= Max
V = 2.7V
20
−200
−225
23
µA
µA
IH
CC
CC
CC
CC
I
= Max
V
= 0.4V
I
−0.5
−40
IL
= Max (Note 3)
= Max,
mA
OS
CC
Outputs HIGH
Outputs LOW
13
27
32
Outputs Open
46
mA
Outputs Disabled
54
Note 2: All typicals are at V = 5V, T = 25°C.
CC
A
Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second.
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2
Switching Characteristics
at VCC = 5V, T = 25°C
A
Symbol
Parameter
Propagation Delay Time
Conditions
Max
Units
t
t
t
t
t
t
t
t
t
t
C
R
C
R
C
R
C
R
C
R
C
R
C
R
C
R
C
R
C
R
= 45 pF
= 667Ω
= 45 pF
= 667Ω
= 45 pF
= 667Ω
= 45 pF
= 667Ω
= 5 pF
PLH
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
18
ns
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Output Enable Time to
LOW Level
PHL
PZL
PZH
PLZ
PHZ
PLH
PHL
PZL
PZH
18
30
23
25
18
21
22
33
26
ns
ns
ns
ns
ns
ns
ns
ns
ns
Output Enable Time to
HIGH Level
Output Disable Time
from LOW Level
= 667Ω
= 5 pF
Output Disable Time
from HIGH Level
= 667Ω
= 150 pF
= 667Ω
= 150 pF
= 667Ω
= 150 pF
= 667Ω
= 150 pF
= 667Ω
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Output Enable Time to
LOW Level
Output Enable Time to
HIGH Level
3
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Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
Package Number M20B
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4
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Package Number M20D
5
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
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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6
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