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74HCT147N Arkusz danych(PDF) 2 Page - NXP Semiconductors

Numer części 74HCT147N
Szczegółowy opis  10-TO-4 LINE PRIORITY ENCODER
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Producent  PHILIPS [NXP Semiconductors]
Strona internetowa  http://www.nxp.com
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December 1990
2
Philips Semiconductors
Product specification
10-to-4 line priority encoder
74HC/HCT147
FEATURES
• Encodes 10-line decimal to 4-line BCD
• Useful for 10-position switch encoding
• Used in code converters and generators
• Output capability: standard
• ICC category: MSI
GENERAL DESCRIPTION
The 74HC/HCT147 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/HCT147 9-input priority encoders accept data
from nine active LOW inputs (A0 to A8) and provide a
binary representation on the four active LOW outputs
(Y0 to Y3). A priority is assigned to each input so that when
two or more inputs are simultaneously active, the input
with the highest priority is represented on the output, with
input line A8 having the highest priority.
The devices provide the 10-line to 4-line priority encoding
function by use of the implied decimal “zero”. The “zero” is
encoded when all nine data inputs are HIGH, forcing all
four outputs HIGH.
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 µW):
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 An to Yn
CL = 15 pF; VCC = 5 V
15
17
ns
CI
input capacitance
3.5
3.5
pF
CPD
power dissipation capacitance per package
notes 1 and 2
30
33
pF


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