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CDC922 データシート(PDF) 7 Page - Texas Instruments

部品番号 CDC922
部品情報  DIRECT RAMBUSE CLOCK GENERATOR
Download  13 Pages
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
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CDC922 データシート(HTML) 7 Page - Texas Instruments

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CDCR81
DIRECT RAMBUS
™ CLOCK GENERATOR
SCAS606B – NOVEMBER 1998 – REVISED NOVEMBER 1999
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP†
MAX
UNIT
tc(out)
Clock output cycle time
2.5
3.75
ns
t
Total cycle jitter over 1, 2,
Stopped phase
alignment
267 MHz –
400 MHz
See Figure 3
60
ps
t(jitter)
Total cycle jitter over 1, 2,
3, 4, 5, or 6 clock cycles
Infinite phase
267 MHz
See Figure 3
80
ps
alignment
300 MHz
See Figure 3
70
ps
t(phase)
Phase detector phase error for distributed loop
Static phase error
–50
50
ps
t(phase, SSC)
PLL output phase error when tracking SSC
Dynamic phase error
–100
100
ps
t(DC)
Output duty cycle over 10,000 cycles
See Figure 4
45%
55%
Stopped phase
alignment
267 MHz –
400 MHz
See Figure 5
50
ps
t(DC, err)
Output cycle-to-cycle
duty cycle error
Ifiit
h
267 MHz
70
(DC, err)
duty cycle error
Infinite phase
alignment
300 MHz
See Figure 5
80
ps
alignment
400 MHz
90
tr, tf
Output rise and fall times (measured at 20%-80% of
output voltage)
See Figure 7
200
450
ps
∆t
Difference between rise and fall times on a single device
(20%–80%) |tf – tr|
See Figure 7
100
ps
† All typical values are at VDD = 3.3 V, TA = 25°C.
state transition latency specifications
PARAMETER
FROM
TO
TEST
CONDITIONS
MIN
TYP†
MAX
UNIT
t()
Delay time, PWRDNB
↑ to CLK/CLKB output
settled (excluding t(DISTLOCK))
Power-
Normal
See Figure 8
3
ms
t(powerup)
Delay time, PWRDNB
↑ to internal PLL and
clock are on and settled
down
Normal
3
ms
t(VDD
)
Delay time, powerup to CLK/CLKB output
settled
VDD
Normal
See Figure 8
3
ms
t(VDDpowerup)
Delay time, powerup to internal PLL and clock
are on and settled
VDD
Normal
3
ms
t(MULT)
MULT0 and MULT1 change to CLK/CLKB
output resettled (excluding t(DISTLOCK))
Normal
Normal
See Figure 9
1
ms
t(CLKON)
STOPB
↑ to CLK/CLKB glitch-free clock edges
CLK
Stop
Normal
See Figure 10
10
ns
t(CLKSETL)
STOPB
↑ to CLK/CLKB output settled to within
50 ps of the phase before STOPB was disabled
CLK
Stop
Normal
See Figure 10
20
cycles
t(CLKOFF)
STOPB
↑ to CLK/CLKB output disabled
Normal
CLK
Stop
See Figure 10
5
ns
t(powerdown)
Delay time, PWRDNB
↓ to the device in power-
down mode
STOPB
Power-
down
1
ms
t(STOP)
Maximum time in CLKSTOP (STOPB = 0)
before re-entering normal mode (STOPB = 1)
STOPB
Normal
100
µs


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