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CDCP1803 Fiches technique(PDF) 11 Page - Texas Instruments

No de pièce CDCP1803
Description  1:3 LVPECL CLOCK BUFFER
Download  25 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
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CDCP1803 Fiches technique(HTML) 11 Page - Texas Instruments

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|Yn*Yn|
Yn
Yn
VOH
VOL
80%
20%
0 V
tr
tf
VOUT(pp)
T0058-02
IN
IN
Y0
Y0
tpd(LH1)
Y1
Y1
tpd(LH2)
Y2
Y2
NOTES: A. Output skew , t
, is calculated as the greater of:
sk(o)
− The difference between the fastest and the slowest t
(n = 0…2)
pd(LH)n
− The difference between the fastest and the slowest t
(n = 0…2)
pd(HL)n
B. Part-to-part skew , t
, is calculated as the greater of:
sk(pp)
− The difference between the fastest and the slowest t
( (n = 0…2 for LVPECL across multiple devices
pd(LH)n
− The difference between the fastest and the slowest t
( (n = 0…2 for LVPECL across multiple devices
pd(HL)n
C.
Pulseskew , t
, is calculated as the magnitude of the absolute time difference between the high-to-low (t
and the low-to-high
sk(p)
pd(HL)
(t
pd(LH
pd(HL)
pd(LH
) propagation delays when a single switching input causes one or more outputs to switch, t
= | t
− t
|. Pulse skew
sk(p)
)
is sometimes referred to as pulse width distortion or duty cycle skew.
T0067-02
CDCP1803
www.ti.com
SCAS727F – NOVEMBER 2003 – REVISED DECEMBER 2013
PARAMETER MEASUREMENT INFORMATION
Figure 6. Waveforms for Calculation of tsk(o) and tsk(pp)
Figure 7. LVPECL Differential Output Voltage and Rise/Fall Time
PCB DESIGN FOR THERMAL FUNCTIONALITY
It is recommended to take special care of the PCB design for good thermal flow from the QFN 24-terminal
package to the PCB.
Due to the three LVPECL outputs, the current consumption of the CDCP1803 is fixed.
JEDEC JESD51-7 specifies thermal conductivity for standard PCB boards.
Copyright © 2003–2013, Texas Instruments Incorporated
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