SDAS038C − DECEMBER 1982 − REVISED DECEMBER 1994
Copyright 1994, Texas Instruments Incorporated
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
•Generate Either Odd or Even Parity for Nine
Data Lines
•Cascadable for n-Bit Parity
•Can Be Used to Upgrade Existing Systems
Using MSI Parity Circuits
•Package Options Include Plastic
Small-Outline (D) Packages and Standard
Plastic (N) 300-mil DIPs
description
These universal 9-bit parity generators/checkers
utilize advanced Schottky high-performance
circuitry and feature odd (Σ ODD) and even (Σ EVEN) outputs to facilitate operation of either odd- or even-parity
applications. The word-length capability is easily expanded by cascading.
These devices can be used to upgrade the performance of most systems utilizing the SN74ALS180 and
SN74AS180 parity generators/checkers. Although the SN74ALS280 and SN74AS280 are implemented without
expander inputs, the corresponding function is provided by the availability of an input (I) at terminal 4 and the
absence of any internal connection at terminal 3. This permits the SN74ALS280 and SN74AS280 to be
substituted for the SN74ALS180 and SN74AS180 in existing designs to produce an identical function even if
the devices are mixed with existing SN74ALS180 and SN74AS180 devices.
All SN74AS280 inputs are buffered to lower the drive requirements.
The SN74ALS280 and SN74AS280 are characterized for operation from 0°C to 70°C.
FUNCTION TABLE
NO. OF INPUTS
A−I
OUTPUTS
A−I
THAT ARE HIGH Σ EVEN Σ ODD
0, 2, 4, 6, 8 H L
1, 3, 5, 7, 9 L H
logic symbol†
2k
12
E
8
A9
B10
C11
D
13
F1
G2
H4
I
6
5Σ EVEN
Σ ODD
†This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
D OR N PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
14
13
12
11
10
9
8
G
H
NC
I
Σ EVEN
Σ ODD
GND
VCC
F
E
D
C
B
A
NC − No internal connection
!"#$%&" ' ()##*& %' "! +),-(%&" .%&*/
#".)(&' ("!"#$ &" '+*(!(%&"' +*# &0* &*#$' "! *1%' '&#)$*&'
'&%.%#. 2%##%&3/ #".)(&" +#"(*''4 ."*' "& *(*''%#-3 (-).*
&*'&4 "! %-- +%#%$*&*#'/
SDAS038C − DECEMBER 1982 − REVISED DECEMBER 1994
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
logic diagram (positive logic)
A
B
C
D
E
F
G
H
I
8
9
10
11
12
13
1
2
4
5
6
Σ EVEN
Σ ODD
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage, VCC 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, VI 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, TA: SN74ALS280 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range −65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
SDAS038C − DECEMBER 1982 − REVISED DECEMBER 1994
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
recommended operating conditions
SN74ALS280
UNIT
MIN NOM MAX
UNIT
VCC Supply voltage 4.5 5 5.5 V
VIH High-level input voltage 2 V
VIL Low-level input voltage 0.8 V
IOH High-level output current −2.6 mA
IOL Low-level output current 24 mA
TAOperating free-air temperature 0 70 °C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN74ALS280
UNIT
PARAMETER
TEST CONDITIONS
MIN TYP†MAX
UNIT
VIK VCC = 4.5 V, II = −18 mA −1.5 V
VOH
VCC = 4.5 V to 5.5 V, IOH = −0.4 mA VCC −2
V
VOH VCC = 4.5 V, IOH = −2.6 mA 2.4 3.3 V
VOL
VCC = 4.5 V
IOL = 12 mA 0.25 0.4
V
VOL VCC = 4.5 V IOL = 24 mA 0.35 0.5 V
IIVCC = 5.5 V, VI = 7 V 0.1 mA
IIH VCC = 5.5 V, VI = 2.7 V 20 µA
IIL VCC = 5.5 V, VI = 0.4 V −0.1 mA
IO‡VCC = 5.5 V, VO = 2.25 V −30 −112 mA
ICC VCC = 5.5 V 10 16 mA
†All typical values are at VCC = 5 V, TA = 25°C.
‡The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
switching characteristics (see Figure 1)
PARAMETER FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500 Ω,
TA = MIN to MAX§UNIT
PARAMETER
(INPUT)
(OUTPUT)
SN74ALS280
UNIT
MIN MAX
tPLH
Any
Σ EVEN
3 20
ns
tPHL Any Σ EVEN 3 20 ns
tPLH
Any
Σ ODD
3 20
ns
tPHL
Any
Σ
ODD
4 22
ns
§For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
SDAS038C − DECEMBER 1982 − REVISED DECEMBER 1994
4POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage, VCC 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, VI 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, TA: SN74AS280 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range −65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
recommended operating conditions
SN74AS280
UNIT
MIN NOM MAX
UNIT
VCC Supply voltage 4.5 5 5.5 V
VIH High-level input voltage 2 V
VIL Low-level input voltage 0.8 V
IOH High-level output current −2 mA
IOL Low-level output current 20 mA
TAOperating free-air temperature 0 70 °C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN74AS280
UNIT
PARAMETER
TEST CONDITIONS
MIN TYP‡MAX
UNIT
VIK VCC = 4.5 V, II = −18 mA −1.5 V
VOH VCC = 4.5 V to 5.5 V, IOH = −2 mA VCC −2 V
VOL VCC = 4.5 V, IOL = 20 mA 0.35 0.5 V
IIVCC = 5.5 V, VI = 7 V 0.1 mA
IIH VCC = 5.5 V, VI = 2.7 V 20 µA
IIL VCC = 5.5 V, VI = 0.4 V −0.5 mA
IO§VCC = 5.5 V, VO = 2.25 V −30 −112 mA
ICC VCC = 5.5 V 25 35 mA
‡All typical values are at VCC = 5 V, TA = 25°C.
§The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
switching characteristics (see Figure 1)
PARAMETER FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500 Ω,
TA = MIN to MAX¶UNIT
PARAMETER
(INPUT)
(OUTPUT)
SN74AS280
UNIT
MIN MAX
tPLH
Any
Σ EVEN
3 12
ns
tPHL Any Σ EVEN 311 ns
tPLH
Any
Σ ODD
3 12
ns
tPHL
Any
Σ
ODD
3 11.5
ns
¶For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
SDAS038C − DECEMBER 1982 − REVISED DECEMBER 1994
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
APPLICATION INFORMATION
A
B
C
D
E
F
G
H
I
Σ EVEN
Σ ODD
A
B
C
D
E
F
G
H
I
Σ EVEN
Σ ODD
A
B
C
D
E
F
G
H
I
Σ EVEN
Σ ODD
H - Even
L = Odd
H - Odd
L = Even
A
B
C
D
E
F
G
H
I
Σ ODD
A
B
C
D
E
F
G
H
I
Σ ODD
A
B
C
D
E
F
G
H
I
Σ ODD
H - Even
L = Odd
H - Odd
L = Even
To Other
SN74AS280s
A
B
C
D
E
F
G
H
I
Σ EVEN
Σ ODD
25-LINE
PARITY GENERATOR/CHECKER 81-LINE
PARITY GENERATOR/CHECKER
Three SN74ALS280/SN74AS280 devices can be
used to implement a 25-line parity generator/
checker.
As an alternative, the Σ ODD outputs of two or three
parity generators/checkers can be decoded with a
2-input (′AS86A or ′ALS86) exclusive-OR gate for
18- or 27-line parity applications.
Longer word lengths can be implemented by cascading SN74ALS280/SN74AS280
devices. Parity can be generated for word lengths up to 81 bits.
SDAS038C − DECEMBER 1982 − REVISED DECEMBER 1994
6POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
PARAMETER MEASUREMENT INFORMATION
SERIES 54ALS/74ALS AND 54AS/74AS DEVICES
tPHZ
tPLZ
tPHL tPLH
0.3 V
tPZL
tPZH
tPLH tPHL
LOAD CIRCUIT
FOR 3-STATE OUTPUTS
From Output
Under Test Test
Point
R1
S1
CL
(see Note A)
7 V
1.3 V
1.3 V1.3 V
3.5 V
3.5 V
0.3 V
0.3 V
th
tsu
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
Timing
Input
Data
Input
1.3 V 1.3 V 3.5 V
3.5 V
0.3 V
0.3 V
High-Level
Pulse
Low-Level
Pulse
tw
VOLTAGE WAVEFORMS
PULSE DURATIONS
Input
Out-of-Phase
Output
(see Note C)
1.3 V 1.3 V
1.3 V1.3 V
1.3 V 1.3 V
1.3 V1.3 V
1.3 V
1.3 V
3.5 V
3.5 V
0.3 V
0.3 V
VOL
VOH
VOH
VOL
Output
Control
(low-level
enabling)
Waveform 1
S1 Closed
(see Note B)
Waveform 2
S1 Open
(see Note B) [0 V
VOH
VOL
[3.5 V
In-Phase
Output
0.3 V
1.3 V 1.3 V
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
R2
VCC
RL
Test
Point
From Output
Under Test
CL
(see Note A)
LOAD CIRCUIT
FOR OPEN-COLLECTOR OUTPUTS
LOAD CIRCUIT FOR
BI-STATE
TOTEM-POLE OUTPUTS
From Output
Under Test Test
Point
CL
(see Note A) RL
RL = R1 = R2
NOTES: A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. When measuring propagation delay items of 3-state outputs, switch S1 is open.
D. All input pulses have the following characteristics: PRR ≤ 1 MHz, tr = tf = 2 ns, duty cycle = 50%.
E. The outputs are measured one at a time with one transition per measurement.
Figure 1. Load Circuits and Voltage Waveforms
PACKAGE OPTION ADDENDUM
www.ti.com 28-Aug-2010
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status (1) Package Type Package
Drawing Pins Package Qty Eco Plan (2) Lead/
Ball Finish MSL Peak Temp (3) Samples
(Requires Login)
SN74ALS280N3 OBSOLETE PDIP N 14 TBD Call TI Call TI Samples Not Available
SN74AS280D ACTIVE SOIC D 14 50 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74AS280DE4 ACTIVE SOIC D 14 50 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74AS280DG4 ACTIVE SOIC D 14 50 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74AS280N ACTIVE PDIP N 14 25 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type Purchase Samples
SN74AS280N3 OBSOLETE PDIP N 14 TBD Call TI Call TI Samples Not Available
SN74AS280NE4 ACTIVE PDIP N 14 25 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type Purchase Samples
SN74AS280NSR ACTIVE SO NS 14 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74AS280NSRE4 ACTIVE SO NS 14 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74AS280NSRG4 ACTIVE SO NS 14 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
PACKAGE OPTION ADDENDUM
www.ti.com 28-Aug-2010
Addendum-Page 2
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
SN74AS280NSR SO NS 14 2000 330.0 16.4 8.2 10.5 2.5 12.0 16.0 Q1
PACKAGE MATERIALS INFORMATION
www.ti.com 14-Jul-2012
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
SN74AS280NSR SO NS 14 2000 367.0 367.0 38.0
PACKAGE MATERIALS INFORMATION
www.ti.com 14-Jul-2012
Pack Materials-Page 2
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