參數(shù)資料
型號(hào)： 74F280
廠商： Fairchild Semiconductor Corporation
英文描述： 9-Bit Parity Generator/Checker
中文描述： 9位奇偶發(fā)生器/檢查
文件頁(yè)數(shù)： 2/8頁(yè)
文件大小： 106K
代理商： 74F280
Philips Semiconductors
Product specification
74F280B
9-bit odd/even parity generator/checker
2
1996 Mar 12
853-0363 16555
FEATURES
High-impedance NPN base inputs for reduced loading
(20
μ
A in Low and High states)
Buffered inputs — one normalized load
Word length easily expanded by cascading
Industrial temperature range available (–40
°
C to +85
°
C)
DESCRIPTION
The 74F280B is a 9-bit Parity Generator or Checker commonly used
to detect errors in high speed data transmission or data retrieval
systems. Both Even (
∑
E
) and Odd (
∑
O
) parity outputs are available
for generating or checking even or odd parity on up to 9 bits.
The Even (
∑
E
) parity output is High when an even number of Data
inputs (I
0
- I
8
) are High. The Odd (
∑
O
) parity output is High when an
odd number of Data inputs are High.
Expansion to larger word sizes is accomplished by tying the Even
(
∑
E
) outputs of up to nine parallel devices to the data inputs of the
final stage. This expansion scheme allows an 81-bit data word to be
checked in less than 20ns.
PIN CONFIGURATION
14
13
12
11
10
9
8
7
6
5
4
3
2
1
V
CC
I
5
I
4
I
3
I
2
I
1
I
0
I
6
I
7
I
8
Σ
E
GND
NC
Σ
O
SF00849
TYPE
TYPICAL
PROPAGATION
DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
74F280B
5.5ns
26mA
ORDERING INFORMATION
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V
±
10%,
T
amb
= 0
°
C to +70
°
C
INDUSTRIAL RANGE
V
CC
= 5V
±
10%,
T
amb
°
C to +85
°
C
PKG. DWG. #
14-pin plastic DIP
N74F280BN
I74F280BN
SOT27-1
14-pin plastic SO
N74F280BD
I74F280BD
SOT108-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74F(U.L.)
HIGH/LOW
LOAD VALUE
HIGH/LOW
I
0
- I
8
Data inputs
1.0/0.033
20
μ
A/20
μ
A
∑
E
,
∑
O
Parity outputs
50/33
1.0mA/20mA
NOTE:
One (1.0) FAST Unit Load is defined as: 20
μ
A in the High state and 0.6mA in the Low state.
LOGIC SYMBOL
8
9
10 11
12 13
1
2
4
5
6
Σ
O
Σ
E
I
0
I
1
I
2
I
3
I
4
I
5
I
6
I
7
I
8
SF00845
IEC/IEEE SYMBOL
8
9
10
11
12
13
1
2
4
5
6
Σ
O
Σ
E
V
=Pin 14
GND=Pin 7
2K
SF00846
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