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參數資料
| 型號： | XRK4991 |
| 廠商： | Exar Corporation |
| 英文描述： | 3.3V HIGH-SPEED (85 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER |
| 中文描述： | 3.3高速（85兆赫）可編程相偏時鐘緩沖器 |
| 文件頁數： | 10/12頁 |
| 文件大?。?/td> | 98K |
| 代理商： | XRK4991 |
XRK4991
3.3V HIGH-SPEED (85 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER
xr
REV. 1.0.1
10
11.
t
SKEWPR
is defined as the skew between a pair of outputs (Qx0 and Qx1) when all eight outputs are selected for
0t
U
.
t
SKEW0
is defined as the skew between outputs when they are selected for 0t
U
. Other outputs are divided or
inverted but not shifted
There are three classes of outputs: Nominal (multiple of t
U
delay), Inverted (QD[1:0] only with SELD0 = SELD1 =
HIGH), and Divided (QC[1:0] and QD[1:0] only in Divide-by-2 or Divide-by-4 mode).
Guaranteed by statistical correlation. Tested initially and after any design or process changes that may affect
these parameters.
t
DEV
is the output-to-output skew between any two devices operating under the same conditions (V
CC
ambient
temperature, air flow, etc.)
t
ODCV
is the deviation of the output from a 50% duty cycle. Output pulse width variations are included in t
SKEW2
and t
SKEW4
specifications.
Specified with outputs loaded with 30pF for the XRK4991-5 and -7 devices. Devices are terminated through 50
to V
CC
/2. t
PWH
is measured at 2.0V. t
PWL
is measured at 0.8V.
t
ORISE
and t
OFALL
measured between 0.8V and 2.0V.
t
LOCK
is the time that is required before synchronization is achieved. This specification is valid only after V
CC
is
stable and within normal operating limits. This parameter is measured from the application of a new signal or
frequency at CLKIN or FB_IN until t
PD
is within specified limits
12.
13.
14.
15.
16.
17.
18.
19.
F
IGURE
6. AC T
IMING
D
IAGRAMS
CLKIN
FB_IN
Qxx output
Other Qxx output
Inverted Qxx output
CLKIN Divided by 2
t
REF
t
RPWH
t
RPWL
t
PD
t
ODCV
t
ODCV
t
JR
t
SKEWPR,
t
SKEW0, 1
t
SKEWPR,
t
SKEW0, 1
t
SKEW2
t
SKEW2
CLKIN Divided by 4
t
SKEW3, 4
t
SKEW3, 4
t
SKEW3, 4
t
SKEW1, 3, 4
t
SKEW2, 4
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| XRK49911 | 制造商:EXAR 制造商全稱:EXAR 功能描述:3.3V HIGH-SPEED (110 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER |
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| XRK49911IJ-2 | 制造商:EXAR 制造商全稱:EXAR 功能描述:3.3V HIGH-SPEED (110 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER |
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