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CDCR81 데이터시트(PDF) 4 Page - Texas Instruments

부품명 CDCR81
상세설명  CDCR81_08
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CDCR81
DIRECT RAMBUS
™ CLOCK GENERATOR
SCAS606B – NOVEMBER 1998 – REVISED NOVEMBER 1999
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PLL divider selection
Table 1 lists the supported REFCLK and BUSCLK frequencies. Other REFCLK frequencies are permitted,
provided that (267 MHz < BUSCLK < 400 MHz) and (33 MHz < REFCLK < 100 MHz).
Table 1. REFCLK and BUSCLK Frequencies
MULT0
MULT1
REFCLK
(MHz)
MULTIPLY
RATIO
BUSCLK
(MHz)
0
0
67
4
267
0
1
50
6
300
0
1
67
6
400
1
1
33
8
267
1
1
50
8
400
1
0
100
8/3
267
clock output driver states
Table 2. Clock Output Driver States
STATE
PWRDNB
STOPB
CLK
CLKB
Powerdown
0
X
GND
GND
CLK stop
1
0
VX, STOP
VX, STOP
Normal
1
1
PACLK/PLLCLK/
REFCLK†
PACLKB/PLLCLKB/
REFCLKB
† Depending on the state of S0, S1, and S2.
absolute maximum ratings over operating free-air temperature (unless otherwise noted)
Supply voltage range, VDD (see Note 1)
–0.5 V to 4 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage range, VO, at any output terminal
–0.5 V to VDD + 0.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range,VI, at any input terminal
–0.5 V to VDD + 0.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ESD rating
TBD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total power dissipation
see Dissipation Rating Table
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, TA
0
°C to 85°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, Tstg
–65
°C to 150°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
260
°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: All voltage values are with respect to the GND terminals.
DISSIPATION RATING TABLE
PACKAGE
TA ≤ 25°C
POWER RATING
DERATING FACTOR
ABOVE TA = 25°C‡
TA = 70°C
POWER RATING
TA = 85°C
POWER RATING
DBQ
1400 mW
11 mW/
°C
905 mW
740 mW
‡ This is the inverse of the junction-to-ambient thermal resistance when board-mounted and with no air flow.


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