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參數(shù)資料
| 型號： | SY89840UMG |
| 廠商： | MICREL INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | Precision LVPECL Runt Pulse Eliminator 2:1 Multiplexer |
| 中文描述： | 89840 SERIES, 2 LINE TO 1 LINE MULTIPLEXER, COMPLEMENTARY OUTPUT, QCC16 |
| 封裝： | LEAD FREE, MLF-16 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大?。?/td> | 1745K |
| 代理商： | SY89840UMG |
Micrel, Inc.
SY89840U
February 2005
10
M9999-021705
hbwhelp@micrel.com
or (408) 955-1690
Case #4 Input Clock Failure: Switching from the
selected clock input stuck in an undetermined state
to a valid clock input (RPE enabled).
If CLK1 fails to an undetermined state (e.g.,
amplitude falls below the 100mV (V
IN
) minimum
single-ended input limit, or 200mV differentially)
before the RPE MUX selects CLK2 (using the SEL
pin), the switchover to the valid clock CLK2 will
occur either following Case #2 or Case #3,
depending on the last valid state at the CLK1.
If the selected input clock fails to a floating, static, or
extremely low signal swing, including 0mV, the FSI
function will eliminate any metastable condition and
guarantee a stable output signal. No ringing and no
undetermined state will occur at the output under
these conditions.
Please note that the FSI function will not prevent
duty cycle distortions or runt pulses in case of a
slowly deteriorating (but still toggling) input signal.
Due to the FSI function, the propagation delay will
depend on rise and fall time of the input signal and
on its amplitude. Refer to “Typical Operating
Characteristics” for more detailed information
.
Timing Diagram 4
Power-On Reset (POR) Description
The SY89840U includes an internal power-on reset
(POR) function to ensure the RPE logic starts-up in
a known logic state once the power-supply voltage is
stable. An external capacitor connected between
V
CC
and the CAP pin (pin 11) controls the delay for
the power-on reset function.
Calculation of the required capacitor value is based
on the time the system power supply needs to power
up to a minimum of 2.3V. The time constant for the
internal power-on-reset must be greater than the
time required for the power supply to ramp up to a
minimum of 2.3V.
The following equation describes this relationship:
As an example, if the time required for the system
power supply to power up past 2.3V is 12ms, the
required capacitor value on pin 11 would be:
C(
μ
F)
)
/
(
12
)
F
(
ms
ms
μ
t
dPS
C(
μ
F)
)
/
(
12
12
ms
F
ms
μ
C(
μ
F)
F
μ
1
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| SY89840UMGTR | Precision LVPECL Runt Pulse Eliminator 2:1 Multiplexer |
| SY89841U | Precision CML Runt Pulse Eliminator 2:1 Multiplexer |
| SY89842U | Precision CML Runt Pulse Eliminator 2:1 Multiplexer |
| SY89845U | PRECISION CML RUNT PULSE ELIMINATOR 2:1 MUX WITH 1:2 FANOUT AND INTERNAL TERMINATION |
| SY89845UMG | PRECISION CML RUNT PULSE ELIMINATOR 2:1 MUX WITH 1:2 FANOUT AND INTERNAL TERMINATION |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SY89840UMG TR | 功能描述:編碼器、解碼器、復用器和解復用器 Precision 2:1 LVPECL MUX w/ RPE & FSI (I Temp, Green) RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SY89840UMGTR | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Precision LVPECL Runt Pulse Eliminator 2:1 Multiplexer |
| SY89841U | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Precision CML Runt Pulse Eliminator 2:1 Multiplexer |
| SY89841UMG | 功能描述:編碼器、解碼器、復用器和解復用器 Precision 2:1 LVDS MUX w/ RPE & FSI (I Temp, Green) RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SY89841UMG TR | 功能描述:編碼器、解碼器、復用器和解復用器 Precision 2:1 LVDS MUX w/ RPE & FSI (I Temp, Green) RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
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