74AC11280
9 BIT PARITY GENERATOR/CHECKER
SCAS055A − D3201, APRIL 1989 − REVISED APRIL 1993
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Generates Either Odd or Even Parity for
Nine Data Lines
Cascadable for n-Bits Parity
Flow-Through Architecture to Optimize
PCB Layout
Center-Pin V
CC
and GND Configurations to
Minimize High-Speed Switching Noise
EPICt
(Enhanced-Performance Implanted
CMOS) 1-mm Process
500-mA Typical Latch-Up Immunity
at 125°C
Package Options Include Plastic
Small-Outline Packages and Standard
Plastic 300-mil DIPs
D OR N PACKAGE
(TOP VIEW)
B
A
Σ
ODD
GND
Σ
EVEN
NC
I
1
2
3
4
5
6
7
14
13
12
11
10
9
8
C
D
E
V
CC
F
G
H
description
This universal, monolithic, nine-bit parity generator/checker features odd and even outputs to facilitate operation
of either odd or even parity application. The word-length capability is easily expanded by cascading.
The 74AC11280 is characterized for operation from − 40°C to 85°C.
FUNCTION TABLE
NUMBER OF INPUTS A
THRU I THAT ARE HIGH
0, 2, 4, 6, 8
1, 3, 5, 7, 9
OUTPUTS
S
EVEN
H
L
S
ODD
L
H
A
B
C
D
E
F
G
H
I
2
1
14
13
12
10
9
8
7
3
5
Σ
EVEN
Σ
ODD
2k
logic symbol
†
† This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
EPIC is a trademark of Texas Instruments Incorporated.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright
1993, Texas Instruments Incorporated
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
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2−1
74AC11280
9 BIT PARITY GENERATOR/CHECKER
SCAS055A − D3201, APRIL 1989 − REVISED APRIL 1993
logic diagram (positive logic)
2
A
1
B
C
14
5
Σ
EVEN
D
13
E
12
F
10
3
Σ
ODD
G
9
H
8
I
7
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage range, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . − 0.5 V to 7 V
Input voltage range, V
I
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . − 0.5 V to V
CC
+ 0.5 V
Output voltage range, V
O
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . − 0.5 V to V
CC
+ 0.5 V
Input clamp current, I
IK
(V
I
< 0 or V
I
> V
CC
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
20 mA
Output clamp current, I
OK
(V
O
< 0 or V
O
> V
CC
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
50 mA
Continuous output current, I
O
(V
O
= 0 to V
CC
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
50 mA
Continuous current through V
CC
or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
100 mA
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.
NOTE 1: The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2−2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
•
•
74AC11280
9 BIT PARITY GENERATOR/CHECKER
SCAS055A − D3201, APRIL 1989 − REVISED APRIL 1993
recommended operating conditions
MIN
VCC
VIH
Supply voltage
VCC = 3 V
VCC = 4.5 V
VCC = 5.5 V
VCC = 3 V
VIL
VI
VO
IOH
Low-level input voltage
Input voltage
Output voltage
VCC = 3 V
VCC = 4.5 V
VCC = 5.5 V
VCC = 3 V
IOL
Dt
/Dv
TA
Low-level output current
Input transition rise or fall rate
Operating free-air temperature
VCC = 4.5 V
VCC = 5.5 V
0
− 40
VCC = 4.5 V
VCC = 5.5 V
0
0
3
2.1
3.15
3.85
0.9
1.35
1.65
VCC
VCC
−4
− 24
−24
12
24
24
10
85
ns / V
°C
mA
mA
V
V
V
V
NOM
5
MAX
5.5
UNIT
V
High-level input voltage
High-level output current
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
3V
IOH = − 50
mA
VOH
IOH = − 4 mA
IOH = − 24 mA
IOH = − 75 mA
{
IOL = 50
mA
VOL
IOL = 12 mA
IOL = 24 mA
IOL = 75 mA
{
II
ICC
Ci
VI = VCC or GND
VI = VCC or GND,
IO = 0
4.5 V
5.5 V
3V
4.5 V
5.5 V
5.5 V
3V
4.5 V
5.5 V
3V
4.5 V
5.5 V
5.5 V
5.5 V
5.5 V
5V
3.5
±
0.1
8
0.1
0.1
0.1
0.36
0.36
0.36
TA = 25°C
MIN TYP†
MAX
2.9
4.4
5.4
2.58
3.94
4.94
MIN
2.9
4.4
5.4
2.48
3.8
4.8
3.85
0.1
0.1
0.1
0.44
0.44
0.44
1.65
±
1
80
mA
mA
pF
V
V
MAX
UNIT
VI = VCC or GND
† All typical values are at VCC = 5 V, TA = 25°C.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
•
•
2−3
74AC11280
9 BIT PARITY GENERATOR/CHECKER
SCAS055A − D3201, APRIL 1989 − REVISED APRIL 1993
switching characteristics over recommended operating free-air temperature range,
V
CC
= 3.3 V
±
0.3 V (see Figure 1)
PARAMETER
tPLH
tPHL
tPLH
tPHL
FROM
(INPUT)
Any input
Any input
TO
(OUTPUT)
EVEN
ODD
TA = 25°C
MIN
TYP
MAX
1.5
1.5
1.5
1.5
9.8
10.5
9.9
10.6
13.5
13.9
13.8
14.4
MIN
1.5
1.5
1.5
1.5
MAX
14.9
15.4
15.1
15.6
ns
ns
UNIT
switching characteristics over recommended operating free-air temperature range,
V
CC
= 5 V
±
0.5 V (see Figure 1)
PARAMETER
tPLH
tPHL
tPLH
tPHL
FROM
(INPUT)
Any input
Any input
TO
(OUTPUT)
EVEN
ODD
TA = 25°C
MIN
TYP
MAX
1.5
1.5
1.5
1.5
5.9
6.7
6
6.8
9.1
9.9
9.3
10.3
MIN
1.5
1.5
1.5
1.5
MAX
10.1
10.9
10.3
11.1
ns
ns
UNIT
operating characteristics, V
CC
= 5 V, T
A
= 25°C
PARAMETER
Cpd
Power dissipation capacitance
TEST CONDITIONS
CL = 50 pF,
f = 1 MHz
TYP
68
UNIT
pF
PARAMETER MEASUREMENT INFORMATION
From Output
Under Test
CL = 50 pF
(see Note A)
500
Ω
Output
50% VCC
Input
(see Note B)
tPLH
VCC
50%
50%
0V
tPHL
VOH
50% VCC
VOL
LOAD CIRCUIT
VOLTAGE WAVEFORMS
NOTES: A. CL includes probe and jig capacitance.
B. Input pulses are supplied by generators having the following characteristics: PRR
≤
10 MHz, ZO = 50
Ω,
tr = 3 ns, tf = 3 ns.
C. The outputs are measured one at a time with one input transition per measurement.
Figure 1. Load Circuit and Voltage Waveforms
2−4
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
•
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