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CS4953XX Scheda tecnica(PDF) 11 Page - Cirrus Logic

Il numero della parte CS4953XX
Spiegazioni elettronici  32-bit Audio Decoder DSP Family
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Produttore elettronici  CIRRUS [Cirrus Logic]
Homepage  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

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CS4953xx Data Sheet
32-bit Audio Decoder DSP Family
DS705PP3
Copyright 2008 Cirrus Logic
11
5.4 Power Supply Characteristics
(measurements performed under operating conditions)
5.5 Thermal Data (144 LQFP)
5.6 Thermal Data (128 LQFP)
Notes: 1. Two-layer board is specified as a 76 mm X 114 mm, 1.6 mm thick FR-4 material with 1-oz copper covering 20 %
of the top & bottom layers.
2.
Four-layer board is specified as a 76 mm X 114 mm, 1.6 mm thick FR-4 material with 1-oz copper covering 20 %
of the top & bottom layers and 0.5-oz copper covering 90 % of the internal power plane and ground plane layers.
3.
To calculate the die temperature for a given power dissipation
4.
Τ
j = Ambient Temperature + [ (Power Dissipation in Watts) *
θ
ja ]
5.
To calculate the case temperature for a given power dissipation
6.
Τ
c =
Τ
j - [ (Power Dissipation in Watts) * ψ jt ]
5.7 Switching Characteristics— RESET
Parameter
Min
Typ
Max
Unit
Power supply current:
Core and I/O operating: VDD1
PLL operating: VDDA
With external memory and most ports operating: VDDIO
1. Dependent on application firmware and DSP clock speed.
-
-
-
500
3.5
120
-
-
-
mA
mA
mA
Parameter
Symbol
Min
Typ
Max
Unit
Thermal Resistance (Junction to Ambient)
Two-layer Board1
Four-layer Board2
θ
ja
-
-
48
40
-
-
°C / Watt
Thermal Resistance (Junction to Top of Package)
Two-layer Board1
Four-layer Board2
ψ
jt
-
-
.39
.33
-
-
°C / Watt
Parameter
Symbol
Min
Typ
Max
Unit
Thermal Resistance (Junction to Ambient)
Two-layer Board1
Four-layer Board2
θ
ja
-
-
53
44
-
-
°C / Watt
Thermal Resistance (Junction to Top of Package)
Two-layer Board1
Four-layer Board2
ψ
jt
-
-
.45
.39
-
-
°C / Watt
Parameter
Symbol
Min
Max
Unit
RESET# minimum pulse width low
Trstl
1-
μs
All bidirectional pins high-Z after RESET# low
Trst2z
-100
ns
Configuration pins setup before RESET# high
Trstsu
50
-
ns
Configuration pins hold after RESET# high
Trsthld
20
-
ns


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