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CDCD5704 Scheda tecnica(PDF) 9 Page - Texas Instruments

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Il numero della parte CDCD5704
Spiegazioni elettronici  Rambus XDR CLOCK GENERATOR
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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RECOMMENDED AC OPERATING CONDITIONS
DEVICE CHARACTERISTICS
CDCD5704
SCAS823 – DECEMBER 2006
MIN
NOM
MAX
UNIT
tCYCLE,IN
REFCLK/REFCLKB input cycle time
7
11
ns
tCYC,TEST REFCLK/REFCLKB input cycle time for BYPASS
4
40
ns
tJ,IN
Input |cycle-to-cycle| jitter(1)
185
ps
DCIN
Input duty cycle over 10,000 cycles(2)
40%
60%
tr/tf
Rise and fall time for REFCLK signal from 20% to 80% of input voltage VIN
175
700
ps
tcr/tcf
Difference between rise time and fall time of REFCLK signal from 20% to 80%
150
ps
fm,IN
SSC frequency modulation repeat frequency(3)
30
33
kHz
Pm tria
Modulation index (= frequency deviation/center frequency) for triangle modulation(3)
0.6%
Pm n tria
Modulation index (= frequency deviation/center frequency) for non-triangle modulation(4)
0.5%
tSR
Input slew rate REFCLK/REFCLKB
1
4
V/ns
SERIAL INTERFACE TIMING
fSCLK
SCLK frequency(5)
0
100
kHz
th(START)
START hold time(5)
4
µs
tw(SCLL)
SCLK low-pulse duration(5)
4.7
µs
tw(SCLH)
SCLK high-pulse duration(5)
4
µs
tsu(START) START setup time(5)
4.7
µs
th(SDATA)
SDATA hold time(5)
300
ps
tsu(SDATA) SDATA setup time(5)
250
ps
tr(SDATA)/
SDATA/SCLK input rise time(5)
1000
ns
tr(SM)
tf(SDATA)/
SDATA/SCLK input fall time(5)
300
ns
tf(SM)
tsu(STOP)
STOP setup time(5)
4
µs
t(BUS)
Bus free time
4.7
µs
(1)
RefCLK jitter is measured at (VIH(nom) – VIL(nom))/2 and is the absolute value of the worst-case deviation.
(2)
Measured at crossing points for differential clock input or at input threshold voltage VTH for single-ended clock input.
(3)
If input modulation is used; input modulation is allowed but not required.
(4)
The amount of allowed spreading for any non-triangular modulation is determined by the induced downstream tracking skew, which
cannot exceed the skew generated by the specified 0.6% triangular modulation. Typically, the amount of allowed non-triangular
modulation is about 0.5%.
(5)
See Figure 1 for the timing behavior of the serial interface.
over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
OVERALL PARAMETER
At 300 MHz and 2.625 V
70
85
IDD
Supply current (= IVDD + IVDDP + IVDDC)
mA
At 667 MHz and 2.625 V
90
115
Supply voltage threshold for power-up control
Over complete supply voltage
VPUC
1.1
1.8
2.2
V
circuit
range
DC DEVICE CHARACTERISTICS
VOX
Differential output crossing-point voltage(1)
Output load; see Figure 3.
0.9
1
1.1
V
VCOS
Output voltage swing (p-p, single-ended)(2)
0.3
0.325
0.35
V
VOL,ABS
Absolute output low voltage(3)
0.85
V
Reference voltage for swing control current
VDD = 2.375 V to 2.625 V, T = 0°C
VISET
0.98
1
1.02
V
IREF(4)
to 70
°C
(1)
VOX is measured on external divider as shown in Figure 3.
(2)
VCOS = (clock output high voltage – clock output low voltage), at the measurement points shown in Figure 3, excluding overshoot and
undershoot.
(3)
VOL,ABS is measured at the clock output of the package, instead of the measurement points of Figure 3.
(4)
IREF is equal to VISET/RRC. Tolerance of RRC must be ±1% or smaller.
9
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