SN54F280B, SN74F280B
9-BIT PARITY GENERATORS/CHECKERS
SDFS008A – D2932, APRIL 1986 – REVISED OCTOBER 1993
Copyright 1993, Texas Instruments Incorporated
2–1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
• Generates Either Odd or Even Parity for
Nine Data Lines
• Cascadable for N-Bits Parity
• Package Options Include Plastic
Small-Outline Packages, Ceramic Chip
Carriers, and Standard Plastic and Ceramic
300-mil DIPs
description
These universal, monolithic, 9-bit parity
generators/checkers feature odd and even
outputs to facilitate operation of either odd or even
parity application. The word-length capability is
easily expanded by cascading.
The SN54F280B is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74F280B is characterized for
operation from 0°C to 70°C.
FUNCTION TABLE
NO. OF INPUTS
OUTPUTS
A THRU 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
A
9
B
10
C
11
D
13
F
1
G
2
H
4
I
6
5
Σ EVEN
Σ ODD
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Pin numbers shown are for the D, J, and N packages.
SN54F280B ...J PACKAGE
SN74F280B ...D OR N PACKAGE
(TOP VIEW)
3212019
910111213
4
5
6
7
8
18
17
16
15
14
E
NC
D
NC
C
NC
NC
I
NC
Σ EVEN
SN54F280B ...FK PACKAGE
(TOP VIEW)
HGNC
A
B
F
ODD
GND
NC
NC – No internal connection
V
CC
1
2
3
4
5
6
7
14
13
12
11
10
9
8
G
H
NC
I
Σ EVEN
Σ ODD
GND
V
CC
F
E
D
C
B
A
Σ
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.
SN54F280B, SN74F280B
9-BIT PARITY GENERATORS/CHECKERS
SDFS008A – D2932, APRIL 1986 – REVISED OCTOBER 1993
2–2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic diagram (positive logic)
A
B
C
8
9
10
D
E
F
11
12
13
G
H
I
1
2
4
5
6
Σ EVEN
Σ ODD
Pin numbers shown are for the D, J, and N packages.
SN54F280B, SN74F280B
9-BIT PARITY GENERATORS/CHECKERS
SDFS008A – D2932, APRIL 1986 – REVISED OCTOBER 1993
2–3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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 (see Note 1) –1.2 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input current range –30 mA to 5 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high state –0.5 V to V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current into any output in the low state 40 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range: SN54F280B –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74F280B 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.
NOTE 1: The input voltage ratings may be exceeded provided the input current ratings are observed.
recommended operating conditions
SN54F280B SN74F280B
MIN NOM MAX MIN NOM MAX
UNIT
V
CC
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
V
IH
High-level input voltage 2 2 V
V
IL
Low-level input voltage 0.8 0.8 V
I
IK
Input clamp current –18 –18 mA
I
OH
High-level output current –1 –1 mA
I
OL
Low-level output current 20 20 mA
T
A
Operating free-air temperature –55 125 0 70 °C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54F280B SN74F280B
PARAMETER
TEST CONDITIONS
MIN TYP‡MAX MIN TYP‡MAX
UNIT
V
IK
VCC = 4.5 V, II = –18 mA –1.2 –1.2 V
VCC = 4.5 V IOH = – 1 mA 2.5 3.4 2.5 3.4
V
OH
VCC = 4.75 V , IOH = – 1 mA 2.7
V
V
OL
VCC = 4.5 V IOL = 20 mA 0.3 0.5 0.3 0.5 V
I
I
VCC = 0, VI = 7 V 0.1 0.1 mA
I
IH
VCC = 5.5 V, VI = 2.7 V 20 20 µA
I
IL
VCC = 5.5 V, VI = 0.5 V –20 –20 µA
I
OS
§
VCC = 5.5 V, VO = 0 –60 –150 –60 –150 mA
I
CC
VCC = 5.5 V, VI = 0 26 35 26 35 mA
‡
All typical values are at VCC = 5 V, TA = 25°C.
§
Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second.
SN54F280B, SN74F280B
9-BIT PARITY GENERATORS/CHECKERS
SDFS008A – D2932, APRIL 1986 – REVISED OCTOBER 1993
2–4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics (see Note 2)
PARAMETER
FROM
(
INPUT
)
TO
(
OUTPUT
)
VCC = 5 V,
CL = 50 pF,
RL = 500 Ω,
TA = 25°C
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500Ω,
TA = MIN to MAX
†
UNIT
(INPUT)
(OUTPUT)
′F280B SN54F280B SN74F280B
MIN TYP MAX MIN MAX MIN MAX
t
PLH
p
3.2 6.1 9 2.7 13 2.7 10
t
PHL
Any input
Σ EVEN
3.2 6.6 10 2.7 15 2.7 11
ns
t
PLH
p
3.2 6.1 9 2.7 14 2.7 10
t
PHL
Any input
Σ ODD
3.2 6.6 10 2.7 14 2.7 11
ns
†
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
NOTE 2: Load circuits and waveforms are shown in Section 1.
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accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
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Copyright 1998, Texas Instruments Incorporated
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