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
DM74LS244N
型号: DM74LS244N
厂家: FAIRCHILD SEMICONDUCTOR    FAIRCHILD SEMICONDUCTOR
描述:

Octal 3-STATE Buffer/Line Driver/Line Receiver
八路三态缓冲器/线路驱动器/线接收器

驱动器
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  
133.  
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  
www.fairchildsemi.com  
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.  
www.fairchildsemi.com  
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
www.fairchildsemi.com  
Physical Dimensions inches (millimeters) unless otherwise noted  
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide  
Package Number M20B  
www.fairchildsemi.com  
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
www.fairchildsemi.com  
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.  
www.fairchildsemi.com  
www.fairchildsemi.com  
6

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