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CDC960DLR Arkusz danych(PDF) 6 Page - Texas Instruments

Numer części CDC960DLR
Szczegółowy opis  200-MHz CLOCK SYNTHESIZER/DRIVER WITH SPREAD SPECTURM CAPABILITY AND DEVICE CONTROL INTERFACE
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Strona internetowa  http://www.ti.com
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CDC960DLR Arkusz danych(HTML) 6 Page - Texas Instruments

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CDC960
200MHz CLOCK SYNTHESIZER/DRIVER
WITH SPREAD SPECTRUM CAPABILITY AND DEVICE CONTROL INTERFACE
SCAS675 – APRIL 2002
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions (Continued)
TERMINAL
I/O
DESCRIPTION
NAME
NO.
I/O
DESCRIPTION
VDDA
43
P
Analog VDD: Connected to 3.3-V power supply through filter. Used to supply the main CPU-PLL
on the chip
VDDF
32
P
Analog VDD for 48-MHz PLL: Connected to 3.3-V power supply through filter. Used to supply the
48-MHz PLL on the chip
XIN
3
I
Crystal input – 14.318 MHz
Crystal Connection or External Reference: Reference crystal input or external reference clock
input. This pin includes an internal 36-pF load capacitance to eliminate the need for an external
load capacitor.
XOUT
4
O
Crystal output – 14.318 MHz
Crystal Connection: Reference crystal feedback. This output includes an internal 36-pF load
capacitance to eliminate the need for an external load capacitor.
24/48_SEL & FDC
28
I/O
3.3-V super I/O clock output: The super I/O clock can be strapped for 24 MHz or 48 MHz. This
input has a 150-k
Ω internal pullup resistor.
Low = 48-MHz output, High = 24-MHz output
connecting SCLK and SDATA to 5-V SMBus signals
SCLK and SDATA of CDC960 have been designed to work within a 3.3-V supply voltage environment only. In
order to connect SCLK and SDATA to a 5-V SMBus configuration, external circuitry is required. A simple and
inexpensive solution is to use clamping diodes. Two approaches are recommended for this solution:
1.
Using Zener diode to clamp to GND in reverse-biased direction
VO
150 k
SCLK
OR
SDATA
Driver
R1
D1
VIO
SCLK
or
SDATA
CDC960
3.3 V
Figure 1. SCLK SDATA Connection to 5-V SMBus Using Zener Diode
Zener diode D1 in Figure 1 is chosen such that the Zener voltage (VZK) cannot exceed 300 mV above VDD of
the CDC960. The minimum value of VZK must be greater than 2.1 V to meet minimum requirement for VIH of
the CDC960. The value of R1 is chosen to satisfy requirements both for IOH of the driver of SCLK and SDATA
and for VOL and IOL of SDATA of CDC960.
I
OH v
V
O *
V
IO
R1
) R
S
(For the driver of SCLK and SDATA. R
S is the source driver impedance.)
2mA
v 0.8 V
R1
) Z
O
v 6 mA
(For a SDATA of CDC960, 25
W t Z
O t
47
W)
R1
) Z
O
1.75 mA
t 0.4 V (For a SDATA of CDC960, 25 W t Z
O t
47
W)
(1)
(2)
(3)


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