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74HCT7731 Folha de dados(PDF) 8 Page - NXP Semiconductors

Nome de Peças 74HCT7731
Descrição Electrónicos  Quad 64-bit static shift register
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Fabricante Electrônico  PHILIPS [NXP Semiconductors]
Página de início  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74HCT7731 Folha de dados(HTML) 8 Page - NXP Semiconductors

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September 1993
8
Philips Semiconductors
Product specification
Quad 64-bit static shift register
74HC/HCT7731
Fig.6 CPD as a function of the duty factor.
handbook, halfpage
CPD
(pF)
0
0.2
0.4
0.6
duty factor
60
40
20
0
MLA166
POWER DISSIPATION INFORMATION
The power dissipation per register operating at the same
frequency is given by:
PD = (CPD x VCC2 x fi) + (CL + VCC2 x fo) + (Ipull-up x VCC)
As PD also depends on the frequency at which the
contents of the internal bits are changing, the value of CPD
is a function of the duty factor (df) being the ration between
data and clock frequency, see Fig.6.
Example:
As the maximum allowable power dissipation in an SO
package at Tamb = 125 °C is 60 mW, it is allowed to apply
4 registers at the same time under these conditions.
PACKAGE OUTLINES
See
“74HC/HCT/HCU/HCMOS Logic Package Outlines”.
fi
= clock input frequency
fo
= data output frequency
CL
= output load capacitance in pF
VCC
= power supply voltage in V.
fi
= 12 MHz
fo
= 3 MHz
CL
= 25 pF
VCC
=5 V
df
= 3/12 = 0.25
CPD
= 42.5 pF
PD = (42.5 × 52 × 12) + (25 × 52 × 3) = 14625 µW


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