SCAS055A − D3201, APRIL 1989 − REVISED APRIL 1993
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D OR N PACKAGE
(TOP VIEW)
Generates Either Odd or Even Parity for
Nine Data Lines
Cascadable for n-Bits Parity
Flow-Through Architecture to Optimize
PCB Layout
Center-Pin VCC and GND Configurations to
Minimize High-Speed Switching Noise
EPICt (Enhanced-Performance Implanted
CMOS) 1-m Process
500-mA Typical Latch-Up Immunity
at 125°C
Package Options Include Plastic
Small-Outline Packages and Standard
Plastic 300-mil DIPs
B
A
Σ ODD
GND
Σ EVEN
NC
I
1
14
2
13
3
12
4
11
5
10
6
9
7
8
C
D
E
VCC
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.
logic symbol†
FUNCTION TABLE
OUTPUTS
NUMBER OF INPUTS A
THRU I THAT ARE HIGH
EVEN
ODD
0, 2, 4, 6, 8
H
L
1, 3, 5, 7, 9
L
H
A
B
C
D
E
F
G
H
I
2
2k
1
14
13
5
12
10
9
3
Σ EVEN
Σ ODD
8
7
† This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
EPIC is a trademark of Texas Instruments Incorporated.
Copyright 1993, Texas Instruments Incorporated
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2−1
SCAS055A − D3201, APRIL 1989 − REVISED APRIL 1993
logic diagram (positive logic)
2
A
B
C
D
E
F
1
14
5
13
12
10
3
G
H
I
Σ EVEN
Σ ODD
9
8
7
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . − 0.5 V to 7 V
Input voltage range, VI (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . − 0.5 V to VCC + 0.5 V
Output voltage range, VO (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . − 0.5 V to VCC + 0.5 V
Input clamp current, IIK (VI < 0 or VI > VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 20 mA
Output clamp current, IOK (VO < 0 or VO > VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 50 mA
Continuous output current, IO (VO = 0 to VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 50 mA
Continuous current through VCC 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
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SCAS055A − D3201, APRIL 1989 − REVISED APRIL 1993
recommended operating conditions
VCC
Supply voltage
VIH
VCC = 3 V
VCC = 4.5 V
High-level input voltage
5
5.5
0.9
1.35
VCC
VCC
0
t /v
Input transition rise or fall rate
TA
Operating free-air temperature
V
1.65
VCC = 3 V
VCC = 4.5 V
Low-level output current
V
V
0
High-level output current
UNIT
3.85
Output voltage
IOL
3
3.15
Input voltage
IOH
MAX
VCC = 4.5 V
VCC = 5.5 V
Low-level input voltage
VI
VO
NOM
2.1
VCC = 5.5 V
VCC = 3 V
VIL
MIN
V
V
−4
− 24
VCC = 5.5 V
VCC = 3 V
−24
VCC = 4.5 V
VCC = 5.5 V
24
mA
12
mA
24
0
10
ns / V
− 40
85
°C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
3V
2.9
2.9
4.5 V
4.4
4.4
5.5 V
5.4
5.4
3V
2.58
2.48
4.5 V
3.94
3.8
IOH = − 24 mA
5.5 V
4.94
4.8
IOH = − 75 mA{
5.5 V
IOH = − 50 A
VOH
IOH = − 4 mA
II
ICC
MIN
MAX
3.85
0.1
0.1
4.5 V
0.1
0.1
5.5 V
0.1
0.1
3V
0.36
0.44
4.5 V
0.36
0.44
IOL = 24 mA
5.5 V
0.36
0.44
IOL = 75 mA{
5.5 V
VI = VCC or GND
VI = VCC or GND,
5.5 V
IOL = 12 mA
IO = 0
VI = VCC or GND
† All typical values are at VCC = 5 V, TA = 25°C.
5V
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V
1.65
5.5 V
Ci
UNIT
V
3V
IOL = 50 A
VOL
TA = 25°C
TYP†
MAX
VCC
3.5
± 0.1
±1
A
8
80
A
pF
2−3
SCAS055A − D3201, APRIL 1989 − REVISED APRIL 1993
switching characteristics over recommended operating free-air temperature range,
VCC = 3.3 V ± 0.3 V (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
tPLH
tPHL
Any input
EVEN
tPLH
tPHL
Any input
ODD
MIN
TA = 25°C
TYP
MAX
MIN
MAX
1.5
9.8
13.5
1.5
14.9
1.5
10.5
13.9
1.5
15.4
1.5
9.9
13.8
1.5
15.1
1.5
10.6
14.4
1.5
15.6
UNIT
ns
ns
switching characteristics over recommended operating free-air temperature range,
VCC = 5 V ± 0.5 V (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
tPLH
tPHL
Any input
EVEN
tPLH
tPHL
Any input
ODD
MIN
TA = 25°C
TYP
MAX
MIN
MAX
1.5
5.9
9.1
1.5
10.1
1.5
6.7
9.9
1.5
10.9
1.5
6
9.3
1.5
10.3
1.5
6.8
10.3
1.5
11.1
UNIT
ns
ns
operating characteristics, VCC = 5 V, TA = 25°C
PARAMETER
Cpd
TEST CONDITIONS
Power dissipation capacitance
CL = 50 pF,
f = 1 MHz
TYP
UNIT
68
pF
PARAMETER MEASUREMENT INFORMATION
Input
(see Note B)
From Output
Under Test
CL = 50 pF
(see Note A)
VCC
50%
50%
0V
tPLH
tPHL
500 Ω
50% VCC
Output
VOH
50% VCC
VOL
VOLTAGE WAVEFORMS
LOAD CIRCUIT
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
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