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
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.
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
INPUTS
VCC
14
F
13
F
G
H
1
G
2
H
3
NC
I
E
12
E
D
11
D
C
10
C
B
9
B
A
8
J SUFFIX
CERAMIC
CASE 632-08
14
1
14
N SUFFIX
PLASTIC
CASE 646-06
1
EVEN ODD
14
1
∑
∑
A
INPUTS
4
5
6
7
∑
GND
I
∑
INPUT EVEN ODD
D SUFFIX
SOIC
CASE 751A-02
OUTPUTS
ORDERING INFORMATION
FUNCTION TABLE
NUMBER OF INPUTS A
THRU 1 THAT ARE HIGH
0, 2, 4, 6, 8
1, 3, 5, 7, 9
H = HIGH Level, L = LOW Level
OUTPUTS
∑EVEN
H
L
∑ODD
L
H
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD
Ceramic
Plastic
SOIC
GUARANTEED OPERATING RANGES
Symbol
VCC
TA
IOH
IOL
Supply Voltage
Operating Ambient Temperature Range
Output Current — High
Output Current — Low
Parameter
54
74
54
74
54, 74
54
74
Min
4.5
4.75
– 55
0
Typ
5.0
5.0
25
25
Max
5.5
5.25
125
70
– 0.4
4.0
8.0
Unit
V
°C
mA
mA
FAST AND LS TTL DATA
5-456
SN54/74LS280
FUNCTIONAL BLOCK DIAGRAM
A
(8)
B
(9)
C
(10)
(5)
∑
EVEN
D
(11)
E
(12)
F
(13)
(6)
∑
ODD
G
(1)
H
(2)
I
(4)
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Limits
Symbol
VIH
VIL
VIK
VOH
Parameter
Input HIGH Voltage
54
Input LOW Voltage
74
Input Clamp Diode Voltage
54
Output HIGH Voltage
74
54, 74
VOL
Output LOW Voltage
74
Input HIGH Current
0.1
Input LOW Current
Short Circuit Current (Note 1)
Power Supply Current
– 20
– 0.4
– 100
27
0.35
0.5
20
IIH
IIL
IOS
ICC
V
µA
mA
mA
mA
mA
2.7
3.5
0.25
0.4
V
V
2.5
– 0.65
3.5
0.8
– 1.5
V
V
Min
2.0
0.7
V
Typ
Max
Unit
V
Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
Guaranteed Input LOW Voltage for
All Inputs
VCC = MIN, IIN = – 18 mA
VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
IOL = 4.0 mA
IOL = 8.0 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
VCC = MAX, VIN = 2.7 V
VCC = MAX, VIN = 7.0 V
VCC = MAX, VIN = 0.4 V
VCC = MAX
VCC = MAX
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS
(TA = 25°C, VCC = 5.0 V)
Limits
Symbol
tPLH
tPHL
tPLH
tPHL
Parameter
Propagation Delay, Data to Output
ΣEVEN
Propagation Delay, Data to Output
ΣODD
Min
Typ
33
29
23
31
Max
50
45
35
50
Unit
ns
CL = 15 pF
ns
Test Conditions
FAST AND LS TTL DATA
5-457
Case 751A-02 D Suffix
14-Pin Plastic
SO-14
-A-
14
8
NOTES:
1.
DIMENSIONS A" AND B" ARE DATUMS AND
T" IS A DATUM SURFACE.
2.
DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
3.
4.
CONTROLLING DIMENSION: MILLIMETER.
DIMENSION A AND B DO NOT INCLUDE MOLD
PROTRUSION.
5.
MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
6.
751A 01 IS OBSOLETE, NEW STANDARD
751A 02.
-B-
1
7
P
7 PL
0.25 (0.010)
M
B
M
G
C
SEATING
PLANE
R X 45°
D
14 PL
0.25 (0.010)
M
K
T
B
S
M
F
J
A
S
DIM
A
B
C
D
F
G
J
K
M
P
R
MILLIMETERS
MIN
MAX
8.55
3.80
1.35
0.35
0.40
8.75
4.00
1.75
0.49
1.25
INCHES
MIN
MAX
0.337
0.150
0.054
0.014
0.016
0.344
0.157
0.068
0.019
0.049
1.27 BSC
0.19
0.10
0
0.25
0.25
7
0.050 BSC
0.008
0.004
0
0.009
0.009
7
°
°
°
°
5.80
0.25
6.20
0.50
0.229
0.010
0.244
0.019
Case 632-08 J Suffix
14-Pin Ceramic Dual In-Line
-A-
14
8
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
-B-
1
7
3. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
4. DIM F MAY NARROW TO 0.76 (0.030) WHERE
THE LEAD ENTERS THE CERAMIC BODY.
5. 632 01 THRU 07 OBSOLETE, NEW STANDARD
C
L
632 08.
-T-
SEATING
PLANE
K
F
D
14 PL
0.25 (0.010)
M
G
T
A
S
N
J
14 PL
M
0.25 (0.010)
M
T
B
S
DIM
A
B
C
D
F
G
J
K
L
M
N
MILLIMETERS
MIN
MAX
19.05
6.23
3.94
0.39
1.40
19.94
7.11
5.08
0.50
1.65
INCHES
MIN
MAX
0.750
0.245
0.155
0.015
0.055
0.785
0.280
0.200
0.020
0.065
2.54 BSC
0.21
3.18
0.38
4.31
0.100 BSC
0.008
0.125
0.015
0.170
7.62 BSC
0
°
15
°
0.300 BSC
0
°
15
°
0.51
1.01
0.020
0.040
Case 646-06 N Suffix
14-Pin Plastic
NOTES:
1.
LEADS WITHIN 0.13 mm (0.005) RADIUS OF TRUE
POSITION AT SEATING PLANE AT MAXIMUM
MATERIAL CONDITION.
14
8
B
1
7
2.
DIMENSION L" TO CENTER OF LEADS WHEN
FORMED PARALLEL.
3.
DIMENSION B" DOES NOT INCLUDE MOLD
FLASH.
4.
5.
ROUNDED CORNERS OPTIONAL.
646 05 OBSOLETE, NEW STANDARD 646 06.
A
F
C
N
H
G
D
SEATING
PLANE
NOTE 4
L
J
K
M
DIM
A
B
C
D
F
G
H
J
K
L
M
N
MILLIMETERS
MIN
MAX
18.16
6.10
3.69
0.38
1.02
19.56
6.60
4.69
0.53
1.78
INCHES
MIN
MAX
0.715
0.240
0.145
0.015
0.040
0.770
0.260
0.185
0.021
0.070
2.54 BSC
1.32
0.20
2.92
2.41
0.38
3.43
0.100 BSC
0.052
0.008
0.115
0.095
0.015
0.135
7.62 BSC
0
°
10
°
0.300 BSC
0
°
10
°
0.39
1.01
0.015
0.039
FAST AND LS TTL DATA
5-458
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit,
and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters can and do vary in different
applications. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. Motorola does
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associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part.
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are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer.
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