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參數(shù)資料
| 型號： | SY58620L |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | Precision 4.25Gbps CML Backplane Transceiver with Integrated Loopback |
| 中文描述： | 精密4.25Gbps的慢性骨髓性白血病背板收發(fā)器集成環(huán)回 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大小： | 662K |
| 代理商： | SY58620L |
Micrel, Inc.
SY58620L
Detailed Description
September 2005
11
M9999-093005-B
hbwhelp@micrel.com
or (408) 955-1690
Receiver
The receiver AC-coupled differential input distributes
data to 4.25Gbps with signals as small as 10mV
(20mV
PP
) or as large as 900mV (1.8V
PP
). The receiver
input features an internal 50
input termination
connected to an internal reference which optimizes
the inputs for AC-coupled signals. Input signals are
linearly amplified with 38dB of differential gain and the
output signal is limited to 400mV (800mV
PP
).
The receiver output buffer features 50
source
termination resistors and a current source that
provides
400mV
(800mV
PP
)
termination. The output buffer terminates to standard
CML loads (100
across the output pair or
equivalent). See the “Output Stage Receiver” section
for more details.
swing
into
50
Transmitter
The transmitter differential input includes Micrel’s
unique, patented 3-pin input termination architecture
that directly interfaces to any (AC- or DC-coupled)
differential signal as small as 100mV (200mV
PP
)
without any termination resistor network in the signal
path.
The transmitter output buffer terminates to standard
CML loads (100
across the output pair, or
equivalent). The output buffer is a special variable
swing CML buffer controlled by TXVCTRL. The output
buffer features 50
source termination and a current
source that provides 400mV (800mV
PP
) swing into
50
transmission lines. See the next section and
Figures 1a and 1b for more details on how to control
the variable output swing feature.
Figure 1a. Voltage Source Implementation
Figure 1b. Alternative Implementation
Transmitter CML Variable-Swing Output Buffer
Connecting V
REF_CTRL
to TXVCTRL sets the
transmitter output buffer to maximum swing
Setting TXVCTRL to V
CC_TXQ
, sets the transmitter
output buffer to minimum swing
Control of the transmitter output buffer swing can be
obtained by using a variable resistor connected
between V
REF_CTRL
and V
CC_TXQ
with a wiper
connected to TXVCTRL as shown in Figure 1b
Receiver LOS
The SY58620L features a chatter-free Loss-of-Signal
(LOS) TTL compatible output with an internal 4.75k
pull-up resistor. LOS circuitry monitors the input
receiver signal and asserts a signal when the input
signal falls below the threshold set by the
programmable LOS level set pin (LOSLVL). When the
amplitude of the receiver input signal falls below the
threshold, LOS is asserted HIGH with a response time
of ~0.2uS. LOS can be fed into /RXEN to maintain
output stability by disabling the output during a Loss-
of-Signal condition. Figure 2a and 2b shows the LOS
connection to /RXEN. When /RXEN is HIGH, the
output signal RXQ is held LOW and /RXQ is held
HIGH. Typically, 2dB of LOS hysteresis is adequate to
prevent the receiver output from chattering. LOS
operation is optimized for data rates
≥
622Mbps with
an input receiver amplitude of at least 10mV
(20mV
PP
). Due to the long time constant in slower
data rates below 622Mbps, the SY58620L LOS
function does not guarantee chatter-free operation for
low amplitude signals.
LOSLVL sets the threshold of the LOS input amplitude
detection. Connecting an external resistor, R
LOSLVL
,
between VCC and LOSLVL sets the input amplitude
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| SY58620L_06 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Precision 4.25Gbps CML Backplane Transceiver with Integrated Loopback |
| SY58620L_10 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Precision 4.25Gbps CML Backplane |
| SY58620LMG | 功能描述:總線收發(fā)器 4.25Gbps Transceiver w/ CML Outputs (I Temp, Green) RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時(shí)間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel |
| SY58620LMG TR | 功能描述:總線收發(fā)器 4.25Gbps Transceiver w/ CML Outputs (I Temp, Green) RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時(shí)間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel |
| SY58620LMGTR | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Precision 4.25Gbps CML Backplane Transceiver with Integrated Loopback |
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