5-456
FAST AND LS TTL DATA
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
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 F E D C B A
G H NC I
∑
EVEN GND
F E D C B
AG
H I
INPUTS INPUT
OUTPUTS
∑
ODD
∑
EVEN
∑
ODD
INPUTS
FUNCTION TABLE
NUMBER OF INPUTS A
THRU 1 THAT ARE HIGH
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 54
74 4.5
4.75 5.0
5.0 5.5
5.25 V
TAOperating Ambient Temperature Range 54
74 –55
025
25 125
70 °C
IOH Output Current — High 54, 74 –0.4 mA
IOL Output Current — Low 54
74 4.0
8.0 mA
SN54/74LS280
9-BIT ODD/EVEN PARITY
GENERATORS/CHECKERS
LOW POWER SCHOTTKY
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC
J SUFFIX
CERAMIC
CASE 632-08
N SUFFIX
PLASTIC
CASE 646-06
14 1
14
1
14 1
D SUFFIX
SOIC
CASE 751A-02
5-457
FAST AND LS TTL DATA
SN54/74LS280
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)
Symbol
Parameter
Limits
Unit
Test Conditions
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
54 0.7
V
Guaranteed Input LOW Voltage for
All Inputs
VIL
Input LOW Voltage
74 0.8
V
Guaranteed 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
54 2.5 3.5 V
V
CC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
VOH
Output HIGH Voltage
74 2.7 3.5 V
VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
VOL
Output LOW Voltage
54, 74 0.25 0.4 V IOL = 4.0 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
VOL
Output LOW Voltage
74 0.35 0.5 V IOL = 8.0 mA
VIN = VIL or VIH
per Truth Table
IIH
Input 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 1) –20 –100 mA VCC = MAX
ICC Power Supply Current 27 mA 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)
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min Typ Max
Unit
Test Conditions
tPLH
tPHL Propagation Delay, Data to Output
ΣEVEN 33
29 50
45 ns
CL = 15 pF
tPLH
tPHL Propagation Delay, Data to Output
ΣODD 23
31 35
50 ns
CL = 15 pF
5-458
FAST AND LS TTL DATA
°
)
°
)
°
)
°
)
! !
"!
!! ( ( "#!
(" ! "# !#
! " !
&
" ! "
! " #
" #!
%# " #!
!
* ! !" $ !"
*
-A-
-B- P
GC
K
DMFJ
R X 45°
17
814
Case 751A-02 D Suffix
14-Pin Plastic
SO-14
"
! !
Case 632-08 J Suffix
14-Pin Ceramic Dual In-Line
°
)
°
)
°
)
°
)
!
!
!
!
"!
! " !
&
" !
! " " $
& $ " $
" " ! " &
* " # * !" $ !"
*
14 8
1 7
-A-
-B-
-T-
F G
D
N
K
CL
J
M
"
! "
!
Case 646-06 N Suffix
14-Pin Plastic
°
°
!
!
!
!
°
°
"!
! $" '' #! " #
!" " !" " %#
" "
! ( " " ! $
! ( ! " #
!
# ! "
* !" $ !" *
1 7
14 8
B
A
F
HGD
N
K
C
L
J
M
5-459
FAST AND LS TTL DATA
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 “T ypicals” must be validated for each customer application by customer’s technical experts. Motorola does
not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in
systems intended for surgical implant into the body , or other applications intended to support or sustain life, or for any other application in which the failure of
the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such
unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless
against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part.
Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer .
Literature Distribution Centers:
USA: Motorola Literature Distribution; P.O. Box 20912; Phoenix, Arizona 85036.
EUROPE: Motorola Ltd.; European Literature Centre; 88 Tanners Drive, Blakelands, Milton Keynes, MK14 5BP, England.
JAPAN: Nippon Motorola Ltd.; 4-32-1, Nishi-Gotanda, Shinagawa-ku, Tokyo 141, Japan.
ASIA PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Center, No. 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong.
◊
