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74F280 반도체 회로 부품 판매점

9-bit odd/even parity generator/checker



Philips 로고
Philips
74F280 데이터시트, 핀배열, 회로
INTEGRATED CIRCUITS
74F280B
9-bit odd/even parity generator/checker
Product specification
IC15 Data Handbook
1996 Mar 12
Philips
Semiconductors


74F280 데이터시트, 핀배열, 회로
Philips Semiconductors
9-bit odd/even parity generator/checker
Product specification
74F280B
FEATURES
High-impedance NPN base inputs for reduced loading
(20µA 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 (I0 - I8) 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.
ORDERING INFORMATION
DESCRIPTION
14-pin plastic DIP
14-pin plastic SO
COMMERCIAL RANGE
VCC = 5V ±10%,
Tamb = 0°C to +70°C
N74F280BN
N74F280BD
PIN CONFIGURATION
I6 1
I7 2
NC 3
I8 4
ΣE 5
ΣO 6
GND 7
14 VCC
13 I5
12 I4
11 I3
10 I2
9 I1
8 I0
SF00849
TYPE
74F280B
TYPICAL
PROPAGATION
DELAY
5.5ns
TYPICAL
SUPPLY CURRENT
(TOTAL)
26mA
INDUSTRIAL RANGE
VCC = 5V ±10%,
Tamb = –40°C to +85°C
I74F280BN
I74F280BD
PKG. DWG. #
SOT27-1
SOT108-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74F(U.L.)
HIGH/LOW
I0 - I8
Data inputs
1.0/0.033
E, O
Parity outputs
50/33
NOTE:
One (1.0) FAST Unit Load is defined as: 20µA in the High state and 0.6mA in the Low state.
LOGIC SYMBOL
IEC/IEEE SYMBOL
LOAD VALUE
HIGH/LOW
20µA/20µA
1.0mA/20mA
8 9 10 11 12 13 1 2 4
I0 I1 I2 I3 I4 I5 I6 I7 I8
ΣE ΣO
56
SF00845
8 2K
9
10
11 ΣE 5
12
13
1 ΣO 6
2
4
VCC=Pin 14
GND=Pin 7
SF00846
1996 Mar 12
2 853-0363 16555




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