SN54/74LS280
9-BIT ODD/EVEN PARITY
GENERATORS/CHECKERS
The SN54/ 74LS280 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.
•
•
•
•
•
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
INPUTS
VCC
F
E
D
C
B
A
14
13
12
11
10
9
8
F
E
D
C
G
H
1
G
2
H
INPUTS
I
3
NC
∑
14
B
1
A
∑
N SUFFIX
PLASTIC
CASE 646-06
EVEN ODD
14
4
5
6
7
∑ GND
I
∑
INPUT EVEN ODD
1
D SUFFIX
SOIC
CASE 751A-02
OUTPUTS
ORDERING INFORMATION
FUNCTION TABLE
NUMBER OF INPUTS A
THRU 1 THAT ARE HIGH
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD
OUTPUTS
∑EVEN
∑ODD
H
L
L
H
0, 2, 4, 6, 8
1, 3, 5, 7, 9
Ceramic
Plastic
SOIC
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
TA
Operating Ambient Temperature Range
54
74
– 55
0
25
25
125
70
°C
IOH
Output Current — High
54, 74
– 0.4
mA
IOL
Output Current — Low
54
74
4.0
8.0
mA
FAST AND LS TTL DATA
5-456
SN54/74LS280
FUNCTIONAL BLOCK DIAGRAM
A
B
C
(8)
(9)
(10)
(5)
∑
EVEN
D
E
F
(11)
(12)
(13)
(6)
∑
ODD
G
H
I
(1)
(2)
(4)
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Min
Parameter
VIH
Input HIGH Voltage
VIL
Input LOW Voltage
VIK
Input Clamp Diode Voltage
VOH
Output HIGH Voltage
VOL
Output LOW Voltage
IIH
Input HIGH Current
IIL
Input LOW Current
IOS
Short Circuit Current (Note 1)
ICC
Power Supply Current
Typ
Max
Unit
2.0
54
0.7
74
0.8
– 0.65
– 1.5
Test Conditions
V
Guaranteed Input HIGH Voltage for
All Inputs
V
Guaranteed Input LOW Voltage for
All Inputs
V
VCC = MIN, IIN = – 18 mA
54
2.5
3.5
V
74
2.7
3.5
V
VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
54, 74
0.25
0.4
V
IOL = 4.0 mA
74
0.35
0.5
V
IOL = 8.0 mA
– 20
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
20
µA
VCC = MAX, VIN = 2.7 V
0.1
mA
VCC = MAX, VIN = 7.0 V
– 0.4
mA
VCC = MAX, VIN = 0.4 V
– 100
mA
VCC = MAX
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)
Limits
Symbol
Parameter
Min
Typ
Max
Unit
tPLH
tPHL
Propagation Delay, Data to Output
ΣEVEN
33
29
50
45
ns
tPLH
tPHL
Propagation Delay, Data to Output
ΣODD
23
31
35
50
ns
FAST AND LS TTL DATA
5-457
Test Conditions
CL = 15 pF
Case 751A-02 D Suffix
14-Pin Plastic
SO-14
"!
!! ( ( ! "
"
! " # %# (" ! "# !#
-A-
8
P
-B1
!
#!
"
#! !
* ! !" $ !"
M
J
F
R X 45°
K
D "
!
! "
*
C
G
"
7
& 14
"#! !
!
!
°
°
°
°
)
)
)
)
Case 632-08 J Suffix
14-Pin Ceramic Dual In-Line
-A-
"!
! "
!
& 14
8
"
! " "
-B1
! 7
* "
-T-
L
G
J "
!
&
# * !" $ !"
"
M
N
D ! " *
K
F
$ " $
" "
C
$
& !
!
!
!
°
!
°
°
°
)
)
)
)
Case 646-06 N Suffix
14-Pin Plastic
"!
14
"
B
1
A
! ( ! " # # F
L
C
J
N
K
M
FAST AND LS TTL DATA
5-458
! "
* !" $ !"
D
! $
!
H
#! "
"
! ( " "
7
G
! $" '' !" " !" " %#
8
*
!
!
!
°
°
!
°
°
#
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
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.
◊
FAST AND LS TTL DATA
5-459