參數(shù)資料
型號(hào)： UT7R995-XCA
廠商： Aeroflex Inc.
英文描述： RadHard 2.5V/3.3V 200MHz High-Speed Multi-phase PLL Clock Buffer
中文描述： RadHard 2.5V/3.3V的200MHz的高速多相PLL時(shí)鐘緩沖器
文件頁(yè)數(shù)： 9/22頁(yè)
文件大小： 185K
代理商： UT7R995-XCA
9
4
PD/DIV
I
3-Level
Power down and reference divider control.
This dual function pin controls the
power down operation and selects the input reference divider. Holding the pin low
during power up ensures clean RadClock startup that is independent of the behavior
of the reference clock. The pin may also be driven low at any time to force a reset
to the PLL. The following table summarizes the operating states controlled by the
PD/DIV pin.
PD/DIV
LOW
MID
HIGH
Operating Mode
Powered Down
Normal Operation
Normal Operation
Input Reference Divider
N/A
÷
2
÷
1
20
LOCK
O
LVTTL
PLL lock indication signal.
A
HIGH
state indicates that the PLL is in a locked
condition. A
LOW
state indicates that the PLL is not locked and the outputs may
not be synchronized to the input. As the following table indicates, the level of phase
alignment between XTAL1 and FB that will cause the LOCK pin to change states is
dependent upon the frequency range selected by the FS input.
FS
L
M
H
LOCK Resolution
1.6ns typical
1.6ns typical
800ps typical
** Note: The LOCK pin can only be considered as a valid output when the RadClock
is in a normal mode of operation (e.g. PD/DIV != LOW, TEST = LOW, and a valid
reference clock is supplied to the XTAL1 input). Until these conditions are met,
RadClock is not in a normal operating mode and the LOCK pin may be HIGH or
LOW and therefore should not be used in making any logical decisions until the
device is in a normal operating mode. Reference the
t
LOCK
parameter in the AC timing
specification to determine the delay for the LOCK pin to become valid HIGH
following a stable input reference clock and the application of a clock to the FB input.
43
V
DD
Q4
2
PWR
Power
Power supply for Bank 4 output buffers.
Please see Table 12 for supply level constraints.
7
V
DD
Q3
2
PWR
Power
Power supply for Bank 3 output buffers.
Please see Table 12 for supply level constraints.
19, 30
V
DD
Q1
2
PWR
Power
Power supply for Bank 1 and Bank 2 output buffers.
Please see Table 12 for supply level constraints.
6, 12, 14,
35, 38
V
DD 2
PWR
Power
Power supply for internal circuitry.
Please see Table 12 for supply level constraints.
10, 11, 15,
16, 21, 29,
33, 34, 39,
40, 44, 45
V
SS
PWR
Power
Ground
Flatpack
Pin No.
Name
I/O
Type
Description
Notes:
1. When TEST = MID and sOE = HIGH, the PLL remains active with nF[1:0] = LL functioning as an output disable control for individual output banks. Skew
selections remain in effect unless nF[1:0] = LL.
2. A bypass capacitor (0.1
μ
F) should be placed as close as possible to each positive power pin (<0.2"). An additional 1
μ
F capacitor should be located within 0.2"
of the output bank power supplies (V
DD
Q1, V
DD
Q3, and V
DD
Q4). If these bypass capacitors are not close to the pins, their high frequency filtering character-
istics will be cancelled by the parasitic inductance of the traces. Additionally, it is recommend that wide traces (0.025" or wider) be used when connecting the
decoupling capacitors to their respective power pins on the RadClock.
相關(guān)PDF資料
PDF描述
UT7R995-XCC RadHard 2.5V/3.3V 200MHz High-Speed Multi-phase PLL Clock Buffer
UT7R995-XCX RadHard 2.5V/3.3V 200MHz High-Speed Multi-phase PLL Clock Buffer
UT7R995-XPA RadHard 2.5V/3.3V 200MHz High-Speed Multi-phase PLL Clock Buffer
UT7R995-XPC RadHard 2.5V/3.3V 200MHz High-Speed Multi-phase PLL Clock Buffer
UT7R995-XPX RadHard 2.5V/3.3V 200MHz High-Speed Multi-phase PLL Clock Buffer
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
UT7R995-XCC 制造商:AEROFLEX 制造商全稱:AEROFLEX 功能描述:RadHard 2.5V/3.3V 200MHz High-Speed Multi-phase PLL Clock Buffer
UT7R995-XCX 制造商:AEROFLEX 制造商全稱:AEROFLEX 功能描述:RadHard 2.5V/3.3V 200MHz High-Speed Multi-phase PLL Clock Buffer
UT7R995-XPA 制造商:AEROFLEX 制造商全稱:AEROFLEX 功能描述:RadHard 2.5V/3.3V 200MHz High-Speed Multi-phase PLL Clock Buffer
UT7R995-XPC 制造商:AEROFLEX 制造商全稱:AEROFLEX 功能描述:RadHard 2.5V/3.3V 200MHz High-Speed Multi-phase PLL Clock Buffer
UT7R995-XPX 制造商:AEROFLEX 制造商全稱:AEROFLEX 功能描述:RadHard 2.5V/3.3V 200MHz High-Speed Multi-phase PLL Clock Buffer
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