參數(shù)資料
型號(hào)： XRK4991IJ-2
廠商： EXAR CORP
元件分類： 時(shí)鐘及定時(shí)
英文描述： 3.3V HIGH-SPEED (85 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER
中文描述： 4991 SERIES, PLL BASED CLOCK DRIVER, 8 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQCC32
封裝： GREEN, PLASTIC, LCC-32
文件頁數(shù)： 4/12頁
文件大?。?/td> 98K
代理商： XRK4991IJ-2
XRK4991
3.3V HIGH-SPEED (85 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER
xr
REV. 1.0.1
4
SKEW SELECT CONTROL
The skew select control consists of four independent banks. Each bank has two low-skew, high-fanout drivers
(Qx0, Qx1), and two corresponding tri-level function select (SELx0, SELx1) inputs. The nine possible output
states for each bank are shown in Table 2 as determined by each bank’s select inputs. All timing
measurements are made with respect to the CLKIN input with the output connected to the FB_IN input
configured for 0 t
U
operation.
N
OTES
:
1.
For all tri-level (three-state) inputs, HIGH indicates a connection to V
CC
, LOW indicates a connection to GND, and
MID indicates an open connection. Internal termination circuitry holds an unconnected input to V
CC
/2.
The level to be set on FSEL is determined by the “normal” operating frequency (f
NOM
) of the PLL. Nominal
frequency (f
NOM
) always appears at QA0 and the other outputs when they are operated in their undivided modes
(see Table 2). The frequency appearing at the CLKIN and FB_IN inputs will be f
NOM
when the output connected to
FB_IN is undivided. The frequency of the CLKIN and FB_IN inputs will be f
NOM
÷ 2 or f
NOM
÷ 4 when the part is
configured for a frequency multiplication.
When the FSEL pin is selected HIGH, the CLKIN input must not transition upon power-up until V
CC
has reached
2.8V.
2.
3.
T
ABLE
1: F
REQUENCY
R
ANGE
S
ELECT
AND
t
U
C
ALCULATION
[1]
f
NOM
(MH
Z
)
t
U
= 1 / (
f
NOM X
N)
A
PPROXIMATE
F
REQUENCY
(MH
Z
)
AT
WHICH
t
U
= 1.0ns
FSEL
[2]
M
IN
M
AX
WHERE
N =
LOW
15
30
44
22.7
MID
25
50
26
38.5
HIGH
[3]
40
85
16
62.5
T
ABLE
2: P
ROGRAMMABLE
S
KEW
C
ONFIGURATIONS
[1]
F
UNCTION
S
ELECT
I
NPUTS
O
UTPUT
F
UNCTIONS
SEL
X
1
SEL
X
0
QA[1:0], QB[1:0]
QC[1:0]
QD[1:0]
LOW
LOW
-4t
U
÷ 2
÷ 2
LOW
MID
-3t
U
-6t
U
-6t
U
LOW
HIGH
-2t
U
-4t
U
-4t
U
MID
LOW
-1t
U
-2t
U
-2t
U
MID
MID
0t
U
0t
U
0t
U
MID
HIGH
+1t
U
+2t
U
+2t
U
HIGH
LOW
+2t
U
+4t
U
+4t
U
HIGH
MID
+3t
U
+6t
U
+6t
U
HIGH
HIGH
+4t
U
÷ 4
Inverted
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XRK4991IJ-5 制造商:EXAR 制造商全稱:EXAR 功能描述:3.3V HIGH-SPEED (85 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER
XRK4993 制造商:EXAR 制造商全稱:EXAR 功能描述:3.3V PROGRAMMABLE SKEW CLOCK BUFFER
XRK4993CR-2 制造商:EXAR 制造商全稱:EXAR 功能描述:3.3V PROGRAMMABLE SKEW CLOCK BUFFER
XRK4993CR-5 制造商:EXAR 制造商全稱:EXAR 功能描述:3.3V PROGRAMMABLE SKEW CLOCK BUFFER
XRK4993CR-7 制造商:EXAR 制造商全稱:EXAR 功能描述:3.3V PROGRAMMABLE SKEW CLOCK BUFFER
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