SN74LS280N [MOTOROLA]
9-BIT ODD/EVEN PARITY GENERATORS/CHECKERS; 9位奇/偶奇偶发生器/跳棋
| 型号： | SN74LS280N |
| 厂家： | 
MOTOROLA |
| 描述： | 9-BIT ODD/EVEN PARITY GENERATORS/CHECKERS |
| 文件： | 总4页 (文件大小：167K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN54/74LS280
9-BIT ODD/EVEN PARITY
GENERATORS/CHECKERS
The SN54/74LS280 is a Universal 9-Bit Parity Generator/Checker. It fea-
tures odd/even outputs to facilitate either odd or even parity. By cascading,
the word length is easily expanded.
The LS280 is designed without the expander input implementation, but the
correspondingfunction is provided by an input at Pin 4 and the absence of any
connection at Pin 3. This design permits the LS280 to be substituted for the
LS180 which results in improved performance. The LS280 has buffered
inputs to lower the drive requirements to one LS unit load.
9-BIT ODD/EVEN PARITY
GENERATORS/CHECKERS
LOW POWER SCHOTTKY
• Generates Either Odd or Even Parity for Nine Data Lines
• Typical Data-to-Output Delay of only 33 ns
• Cascadable for n-Bits
• Can Be Used To Upgrade Systems Using MSI Parity Circuits
• Typical Power Dissipation = 80 mW
J SUFFIX
CERAMIC
CASE 632-08
14
1
N SUFFIX
PLASTIC
CASE 646-06
14
1
∑
∑
∑
∑
D SUFFIX
SOIC
CASE 751A-02
14
1
OUTPUTS
ORDERING INFORMATION
FUNCTION TABLE
SN54LSXXXJ
SN74LSXXXN Plastic
SN74LSXXXD SOIC
Ceramic
OUTPUTS
NUMBER OF INPUTS A
THRU 1 THAT ARE HIGH
∑EVEN ∑ODD
0, 2, 4, 6, 8
1, 3, 5, 7, 9
H
L
L
H
H = HIGH Level, L = LOW Level
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
V
CC
Supply Voltage
54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
T
A
Operating Ambient Temperature Range
54
74
–55
0
25
25
125
70
°C
I
I
Output Current — High
Output Current — Low
54, 74
–0.4
mA
mA
OH
54
74
4.0
8.0
OL
FAST AND LS TTL DATA
5-456
SN54/74LS280
FUNCTIONAL BLOCK DIAGRAM
∑
∑
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Min
Typ
Max
Symbol
Parameter
Input HIGH Voltage
Unit
Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
V
2.0
V
IH
54
74
0.7
0.8
Guaranteed Input LOW Voltage for
All Inputs
V
V
V
Input LOW Voltage
V
IL
Input Clamp Diode Voltage
Output HIGH Voltage
–0.65
3.5
–1.5
V
V
V
V
V
= MIN, I = –18 mA
IN
IK
CC
54
74
2.5
2.7
= MIN, I
OH
= MAX, V = V
IN
CC
IH
OH
or V per Truth Table
IL
3.5
V
V
= V
CC
MIN,
= V or V
IL IH
54, 74
74
0.25
0.35
0.4
0.5
V
V
I
I
= 4.0 mA
= 8.0 mA
CC
IN
OL
V
Output LOW Voltage
Input HIGH Current
OL
per Truth Table
OL
20
0.1
µA
mA
mA
mA
mA
V
V
V
V
V
= MAX, V = 2.7 V
IN
CC
CC
CC
CC
CC
I
IH
= MAX, V = 7.0 V
IN
I
I
I
Input LOW Current
–0.4
–100
27
= MAX, V = 0.4 V
IN
IL
Short Circuit Current (Note 1)
Power Supply Current
–20
= MAX
= MAX
OS
CC
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (T = 25°C, V
CC
= 5.0 V)
A
Limits
Typ
Symbol
Parameter
Unit
Test Conditions
Min
Max
t
t
Propagation Delay, Data to Output
33
29
50
45
PLH
PHL
ns
ΣEVEN
C
= 15 pF
L
t
t
Propagation Delay, Data to Output
23
31
35
50
PLH
PHL
ns
ΣODD
FAST AND LS TTL DATA
5-457
Case 751A-02 D Suffix
14-Pin Plastic
SO-14
-A-
14
1
8
7
P
C
-B-
R X 45°
G
K
J
M
F
D
°
°
°
°
Case 632-08 J Suffix
14-Pin Ceramic Dual In-Line
-A-
14
1
8
7
-B-
C
L
-T-
K
M
F
G
N
J
D
°
°
°
°
Case 646-06 N Suffix
14-Pin Plastic
14
1
8
B
7
A
F
L
C
J
N
K
G
H
D
M
°
°
°
°
FAST AND LS TTL DATA
5-458
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相关型号：
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