Semiconductor Components Industries, LLC, 2001
October, 2001 – Rev. 7 1Publication Order Number:
SN74LS280/D
SN74LS280
9-Bit Odd/Even Parity
Generators/Checkers
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.
•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 13 12 11 10 9
123456
8
7
VCC FEDCBA
G H NC I
EVEN GND
FEDCB
AG
HI
INPUTS
INPUT
OUTPUTS
ODD
EVEN
ODD
INPUTS
FUNCTION TABLE
NUMBER OF INPUTS A OUTPUTS
NUMBER
OF
INPUTS
A
THRU 1 THAT ARE HIGH ∑EVEN ∑ODD
0, 2, 4, 6, 8 H L
1, 3, 5, 7, 9 L H
H = HIGH Level, L = LOW Level
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
VCC Supply Voltage 4.75 5.0 5.25 V
TAOperating Ambient
Temperature Range 0 25 70 °C
IOH Output Current – High –0.4 mA
IOL Output Current – Low 8.0 mA
LOW
POWER
SCHOTTKY
SOIC
D SUFFIX
CASE 751A
PLASTIC
N SUFFIX
CASE 646
14
1
14
1
SOEIAJ
M SUFFIX
CASE 965
14 1
http://onsemi.com
Device Package Shipping
ORDERING INFORMATION
SN74LS280N 14 Pin DIP 2000 Units/Box
SN74LS280D SOIC–14 55 Units/Rail
SN74LS280DR2 SOIC–14 2500/Tape & Reel
SN74LS280M SOE IAJ–14 See Note 1
SN74LS280MEL SOEIAJ–14
1. For ordering information on the EIAJ version of
the SOIC package, please contact your local
ON Semiconductor representative.
See Note 1
SN74LS280
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2
A
B
C
D
E
F
G
H
I
(8)
(9)
(10)
(11)
(12)
(13)
(1)
(2)
(4)
(5)
(6)
EVEN
ODD
FUNCTIONAL BLOCK DIAGRAM
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol Parameter Min Typ Max Unit Test Conditions
VIH Input HIGH Voltage 2.0 V Guaranteed Input HIGH Voltage for
All Inputs
VIL Input LOW Voltage 0.8 VGuaranteed Input LOW Voltage for
All Inputs
VIK Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
VOH Output HIGH Voltage 2.7 3.5 V VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
VOL
Out
p
ut LOW Voltage
0.25 0.4 V IOL = 4.0 mA VCC = VCC MIN,
VIN VIL or VIH
VOL Output LOW Voltage 0.35 0.5 V IOL = 8.0 mA VIN = VIL or VIH
per Truth Table
IIH
In
p
ut HIGH Current
20 µA VCC = MAX, VIN = 2.7 V
IIH Input HIGH Current 0.1 mA VCC = MAX, VIN = 7.0 V
IIL Input LOW Current –0.4 mA VCC = MAX, VIN = 0.4 V
IOS Short Circuit Current (Note 2) –20 –100 mA VCC = MAX
ICC Power Supply Current 27 mA VCC = MAX
2. 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 Parameter Min Typ Max Unit Test Conditions
tPLH
tPHL Propagation Delay, Data to Output
ΣEVEN 33
29 50
45 ns
CL=15
p
F
tPLH
tPHL Propagation Delay, Data to Output
ΣODD 23
31 35
50 ns CL = 15 pF
SN74LS280
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3
PACKAGE DIMENSIONS
17
14 8
B
ADIM MIN MAX MIN MAX
MILLIMETERSINCHES
A0.715 0.770 18.16 18.80
B0.240 0.260 6.10 6.60
C0.145 0.185 3.69 4.69
D0.015 0.021 0.38 0.53
F0.040 0.070 1.02 1.78
G0.100 BSC 2.54 BSC
H0.052 0.095 1.32 2.41
J0.008 0.015 0.20 0.38
K0.115 0.135 2.92 3.43
L
M--- 10 --- 10
N0.015 0.039 0.38 1.01
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
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.
F
HG DK
C
SEATING
PLANE
N
–T–
14 PL
M
0.13 (0.005)
L
M
J0.290 0.310 7.37 7.87
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
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.
–A–
–B–
G
P7 PL
14 8
71 M
0.25 (0.010) B M
S
B
M
0.25 (0.010) A S
T
–T–
F
RX 45
SEATING
PLANE D14 PL K
C
J
M
DIM MIN MAX MIN MAX
INCHESMILLIMETERS
A8.55 8.75 0.337 0.344
B3.80 4.00 0.150 0.157
C1.35 1.75 0.054 0.068
D0.35 0.49 0.014 0.019
F0.40 1.25 0.016 0.049
G1.27 BSC 0.050 BSC
J0.19 0.25 0.008 0.009
K0.10 0.25 0.004 0.009
M0 7 0 7
P5.80 6.20 0.228 0.244
R0.25 0.50 0.010 0.019
D SUFFIX
PLASTIC SOIC PACKAGE
CASE 751A–03
ISSUE F
N SUFFIX
PLASTIC PACKAGE
CASE 646–06
ISSUE M
SN74LS280
http://onsemi.com
4
PACKAGE DIMENSIONS
HE
A1
DIM MIN MAX MIN MAX
INCHES
--- 2.05 --- 0.081
MILLIMETERS
0.05 0.20 0.002 0.008
0.35 0.50 0.014 0.020
0.18 0.27 0.007 0.011
9.90 10.50 0.390 0.413
5.10 5.45 0.201 0.215
1.27 BSC 0.050 BSC
7.40 8.20 0.291 0.323
0.50 0.85 0.020 0.033
1.10 1.50 0.043 0.059
0
0.70 0.90 0.028 0.035
--- 1.42 --- 0.056
A1
HE
Q1
LE
10 0
10
LEQ1
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS D AND E DO NOT INCLUDE MOLD
FLASH OR PROTRUSIONS AND ARE MEASURED
AT THE PARTING LINE. MOLD FLASH OR
PROTRUSIONS SHALL NOT EXCEED 0.15 (0.006)
PER SIDE.
4. TERMINAL NUMBERS ARE SHOWN FOR
REFERENCE ONLY.
5. THE LEAD WIDTH DIMENSION (b) DOES NOT
INCLUDE DAMBAR PROTRUSION. ALLOWABLE
DAMBAR PROTRUSION SHALL BE 0.08 (0.003)
TOTAL IN EXCESS OF THE LEAD WIDTH
DIMENSION AT MAXIMUM MATERIAL CONDITION.
DAMBAR CANNOT BE LOCATED ON THE LOWER
RADIUS OR THE FOOT. MINIMUM SPACE
BETWEEN PROTRUSIONS AND ADJACENT LEAD
TO BE 0.46 ( 0.018).
0.13 (0.005) M0.10 (0.004)
D
Z
E
1
14 8
7
eA
b
VIEW P
c
L
DETAIL P
M
A
b
c
D
E
e
0.50
M
Z
M SUFFIX
SOEIAJ PACKAGE
CASE 965–01
ISSUE O
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4–32–1 Nishi–Gotanda, Shinagawa–ku, Tokyo, Japan 141–0031
Phone: 81–3–5740–2700
Email: r14525@onsemi.com
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For additional information, please contact your local
Sales Representative.
SN74LS280/D
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