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參數(shù)資料
| 型號： | 933713880652 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 算術邏輯單元 |
| 英文描述： | HC/UH SERIES, 9-BIT PARITY GENERATOR/CHECKER, COMPLEMENTARY OUTPUT, PDSO14 |
| 封裝： | PLASTIC, SO-14 |
| 文件頁數(shù)： | 2/7頁 |
| 文件大小： | 49K |
| 代理商： | 933713880652 |
December 1990
2
Philips Semiconductors
Product specication
9-bit odd/even parity generator/checker
74HC/HCT280
FEATURES
Word-length easily expanded by cascading
Similar pin configuration to the “180” for easy system
up-grading
Generates either odd or even parity for nine data bits
Output capability: standard
ICC category: MSI
GENERAL DESCRIPTION
The 74HC/HCT280 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT280 are 9-bit parity generators or checkers
commonly used to detect errors in high-speed data
transmission or data retrieval systems. Both even and odd
parity outputs are available for generating or checking
even or odd parity up to 9 bits.
The even parity output (
∑E) is HIGH when an even number
of data inputs (I0 to I8) are HIGH. The odd parity output (∑0)
is HIGH when an odd number of data inputs are HIGH.
Expansion to larger word sizes is accomplished by tying
the even outputs (
∑E) of up to nine parallel devices to the
data inputs of the final stage. For a single-chip 16-bit
even/odd parity generator/checker, see
PC74HC/HCT7080.
APPLICATIONS
25-line parity generator/checker
81-line parity generator/checker
QUICK REFERENCE DATA
GND = 0 V; Tamb =25 °C; tr =tf = 6 ns
Notes
1. CPD is used to determine the dynamic power dissipation (PD in W):
PD =CPD × VCC2 × fi +∑ (CL × VCC2 × fo) where:
fi = input frequency in MHz
fo = output frequency in MHz
∑ (CL × VCC2 × fo) = sum of outputs
CL = output load capacitance in pF
VCC = supply voltage in V
2. For HC the condition is VI = GND to VCC
For HCT the condition is VI = GND to VCC 1.5 V
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package Information”.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
tPHL/ tPLH
propagation delay
CL = 15 pF; VCC =5 V
In to ∑E
17
18
ns
In to ∑O
20
22
ns
CI
input capacitance
3.5
pF
CPD
power dissipationcapacitance per package
notes 1 and 2
65
pF
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