74LS280 [ONSEMI]
LOW POWER SCHOTTKY; 小功率肖特基型号: | 74LS280 |
厂家: | ONSEMI |
描述: | LOW POWER SCHOTTKY |
文件: | 总4页 (文件大小:110K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
The SN74LS280 is a Universal 9-Bit Parity Generator/Checker. It
features 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 corresponding function 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.
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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
14
1
INPUTS
PLASTIC
N SUFFIX
CASE 646
V
F
E
D
C
B
9
A
8
CC
14
13
12
11
10
F
E
D
I
C
B
G
A
∑
∑
H
EVEN ODD
14
1
1
G
2
H
3
NC
4
I
5
∑
6
∑
7
GND
SOIC
D SUFFIX
CASE 751A
EVEN ODD
INPUT
INPUTS
OUTPUTS
FUNCTION TABLE
OUTPUTS
NUMBER OF INPUTS A
THRU 1 THAT ARE HIGH
∑EVEN ∑ODD
ORDERING INFORMATION
0, 2, 4, 6, 8
1, 3, 5, 7, 9
H
L
L
H
Device
Package
14 Pin DIP
14 Pin
Shipping
H = HIGH Level, L = LOW Level
SN74LS280N
SN74LS280D
2000 Units/Box
GUARANTEED OPERATING RANGES
2500/Tape & Reel
Symbol
Parameter
Supply Voltage
Min
4.75
0
Typ
5.0
25
Max
5.25
70
Unit
V
V
CC
T
A
Operating Ambient
Temperature Range
°C
I
Output Current – High
Output Current – Low
–0.4
8.0
mA
mA
OH
I
OL
Semiconductor Components Industries, LLC, 1999
1
Publication Order Number:
December, 1999 – Rev. 6
SN74LS280/D
SN74LS280
FUNCTIONAL BLOCK DIAGRAM
(8)
A
B
C
(9)
(10)
(5)
∑
EVEN
(11)
(12)
D
E
(13)
F
(6)
∑
ODD
(1)
(2)
(4)
G
H
I
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
0.8
Guaranteed Input LOW Voltage for
All Inputs
V
V
V
Input LOW Voltage
V
V
V
IL
Input Clamp Diode Voltage
Output HIGH Voltage
–0.65
3.5
–1.5
V
V
= MIN, I = –18 mA
IN
IK
CC
= MIN, I = MAX, V = V
IH
CC
OH
IN
2.7
OH
or V per Truth Table
IL
V
V
= V MIN,
CC
0.25
0.35
0.4
0.5
V
V
I
I
= 4.0 mA
= 8.0 mA
CC
OL
= V or V
IH
V
Output LOW Voltage
Input HIGH Current
IN
IL
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
IL
IN
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 = 5.0 V)
A
CC
Limits
Typ
Symbol
Parameter
Unit
Test Conditions
Min
Max
t
t
Propagation Delay, Data to Output
33
29
50
45
PLH
ns
ΣEVEN
PHL
C = 15 pF
L
t
t
Propagation Delay, Data to Output
23
31
35
50
PLH
PHL
ns
ΣODD
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2
SN74LS280
PACKAGE DIMENSIONS
N SUFFIX
PLASTIC PACKAGE
CASE 646–06
ISSUE M
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
14
1
8
7
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
B
INCHES
DIM MIN MAX
0.770 18.16
MILLIMETERS
A
F
MIN
MAX
18.80
6.60
4.69
0.53
1.78
A
B
C
D
F
0.715
0.240
0.145
0.015
0.040
0.260
0.185
0.021
0.070
6.10
3.69
0.38
1.02
L
N
C
G
H
J
K
L
0.100 BSC
2.54 BSC
0.052
0.008
0.115
0.290
–––
0.095
0.015
0.135
0.310
10
1.32
0.20
2.92
7.37
–––
2.41
0.38
3.43
7.87
10
–T–
SEATING
PLANE
J
K
M
N
0.015
0.039
0.38
1.01
D 14 PL
H
G
M
M
0.13 (0.005)
D SUFFIX
PLASTIC SOIC PACKAGE
CASE 751A–03
ISSUE F
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
–A–
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
14
1
8
7
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
–B–
P 7 PL
M
M
0.25 (0.010)
B
MILLIMETERS
DIM MIN MAX
INCHES
MIN
MAX
0.344
0.157
0.068
0.019
0.049
A
B
C
D
F
8.55
3.80
1.35
0.35
0.40
8.75 0.337
4.00 0.150
1.75 0.054
0.49 0.014
1.25 0.016
G
F
R X 45
C
G
J
K
M
P
1.27 BSC
0.050 BSC
–T–
SEATING
PLANE
0.19
0.10
0
0.25 0.008
0.25 0.004
0.009
0.009
7
J
M
K
D 14 PL
7
0
M
S
S
0.25 (0.010)
T B
A
5.80
0.25
6.20 0.228
0.50 0.010
0.244
0.019
R
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3
SN74LS280
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SN74LS280/D
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