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PDF SY58620L Data sheet ( Hoja de datos )

Número de pieza SY58620L
Descripción Precision 4.25Gbps CML Backplane Transceiver
Fabricantes Micrel Semiconductor 
Logotipo Micrel Semiconductor Logotipo



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SY58620L
Precision 4.25Gbps CML Backplane
Transceiver with Integrated Loopback
General Description
The SY58620L is a low jitter, high-speed transceiver
with a variable swing CML transmitter buffer and a CML
high-gain receiver optimized for precision telecom and
enterprise server transmission line and backplane data
management. The SY58620L distributes data to
4.25Gbps guaranteed over temperature and voltage.
The SY58620L transmitter differential input includes
Micrel’s unique, 3-pin input termination architecture that
directly interfaces to any (AC- or DC-coupled)
differential signal as small as 100mV (200mVPP) without
any termination resistor network in the signal path. The
receiver differential input is optimized to interface
directly to AC-coupled signals as small as 10mV
(20mVPP). The outputs are 50source-terminated CML
with extremely fast rise/fall time.
To support remote self-testing, the SY58620L features a
high-speed loopback test mode. The input control signal
LOOPBACK enables an internal loopback path from the
transmitter input to the receiver output.
The SY58620L operates from a 3.3V ±10% supply and
is guaranteed over the full industrial temperature range
of –40°C to +85°C. The SY58620L is part of Micrel’s
high-speed, Precision Edge® product line.
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
Applications
Backplane management
Active cable transceivers
SONET/SDH data/clock applications
4X Fibre Channel applications
Typical Applications
Features
Precision Edge®
Guaranteed AC performance over temperature and
voltage:
- Maximum Throughput 4.25Gbps
- <120ps tr/tf time
Transmitter
- Patented input termination directly interfaces to AC-
or DC-coupled differential inputs
- Variable swing CML output
Receiver
- 32dB high-gain Input
- Internal 50input termination
- Accepts AC-coupled input signals as small as 10mV
(20mVPP)
- 400mV (800mVPP) differential CML output swing
Loss-of-Signal (LOS)
- High-gain, TTL-compatible LOS output with internal
4.75kpull-up
- Programmable LOS level set
Ultra-low jitter design
- <5psRMS random jitter
Patent-pending MUX isolates the receiver and the
transmitter channels minimizing on crosstalk
Selectable loopback diagnostic mode
Output enable
Power supply +3.3V ±10%
Industrial temperature range -40°C to +85°C
Available in 24-pin (4mm x 4mm) MLF™
Markets
Precision telecom
Enterprise server
ATE
Test and measurement
Precision Edge is a registered trademark of Micrel, Inc.
MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
September 2005
M9999-093005-B
[email protected] or (408) 955-1690

1 page




SY58620L pdf
Micrel, Inc.
SY58620L
Outputs
Pin Number
22
19
17, 16
5, 6
8
10
Pin Name
LOS
LOSLVL
RXQ, /RXQ
TXQ, /TXQ
VREF_CTRL
TXVREF-AC
Pin Description
Loss-of-Signal Output. TTL-compatible output with internal 4.75kpull-up resistor. Loss-of-
Signal asserts to logic HIGH when the receiver input amplitudes falls below the threshold set
by LOSLVL.
RX Loss-of-Signal Level Set. A resistor (RLOSLVL) connected between LOSLVL and VCC sets
the threshold for the data input amplitude at which the LOS output is asserted. Default is max
sensitivity. LOSLVL is used to set the Loss-of-Signal (LOS) voltage. It is internally connected
to a 2.8kpull-down resistor to an internal VREF voltage source. See “Typical Operating
Characteristics,” and “Application Implementation” sections for more details.
Receiver Differential Output. Output is CML compatible. Refer to the “Truth Table” and
“Output Stage” sections for more details. Unused output pair may be left open. The output is
designed to drive 400mV (800mVPP) into 50to VCC or 100across the pair.
Transmitter Differential Variable Swing Output. Output is CML compatible. Please refer to the
“Truth Table” and “Output Stage” sections for more details. Unused output pair may be left
open. The output is designed to drive 80mV (160mVPP) min swing to 400mV (800mVPP) typ.
swing into 50to VCC_TXQ or drive 100across the pair depending on TXVCTRL.
Transmitter Output Reference Voltage. Output biases to VCC_TXQ-1.3V. Connecting VREF_CTRL
to TXVCTRL sets the transmitter output swing to max swing.
Transmitter Input Reference Voltage. This output biases to VCC-1.3V. It is used when AC
coupling the transmitter input. For AC-coupled applications, connect TXVREF-AC to the
TXVT pin and bypass with a 0.01µF low ESR capacitors to VCC. See “Input Stage” section for
more details. Maximum sink/source current is ±1.5mA.
Power Pins
Pin Number
3, 24
12, 15, 18
21
4
Pin Name
GND,
Exposed Pad
VCC
VCC_RXIN
VCC_TXQ
Pin Description
Ground. GND pins and exposed pad must be connected to the same ground plane.
3.3V ±10% Positive Power Supply. Bypass with 0.1µF//0.01µF low ESR capacitors and place
as close to each VCC pins as possible. Power pins are not connected internally and must be
connected to the same power supply externally.
3.3V ±10% Receive Input Power Supply. Bypass with 0.1µF//0.01µF low ESR capacitors and
place as close to the VCC_RXIN pin as possible. Power pins are not connected internally and
must be connected to the same power supply externally.
3.3V ±10% Output Transmit Power Supply. Bypass with 0.1µF//0.01µF low ESR capacitors
and place as close to the VCC_TXQ pin as possible. Power pins are not connected internally
and must be connected to the same power supply externally.
Truth Table
LOOPBACK
0
1
RXQ
RXIN
TXIN
TXQ
TXIN
RXIN
September 2005
5 M9999-093005-B
[email protected] or (408) 955-1690

5 Page





SY58620L arduino
Micrel, Inc.
Detailed Description
Receiver
The receiver AC-coupled differential input distributes
data to 4.25Gbps with signals as small as 10mV
(20mVPP) or as large as 900mV (1.8VPP). The receiver
input features an internal 50input 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 (800mVPP).
The receiver output buffer features 50source
termination resistors and a current source that
provides 400mV (800mVPP) swing into 50
termination. The output buffer terminates to standard
CML loads (100across the output pair or
equivalent). See the “Output Stage Receiver” section
for more details.
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 (200mVPP)
without any termination resistor network in the signal
path.
The transmitter output buffer terminates to standard
CML loads (100across the output pair, or
equivalent). The output buffer is a special variable
swing CML buffer controlled by TXVCTRL. The output
buffer features 50source termination and a current
source that provides 400mV (800mVPP) swing into
50transmission 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
SY58620L
Figure 1b. Alternative Implementation
Transmitter CML Variable-Swing Output Buffer
Connecting VREF_CTRL to TXVCTRL sets the
transmitter output buffer to maximum swing
Setting TXVCTRL to VCC_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 VREF_CTRL and VCC_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
(20mVPP). 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, RLOSLVL,
between VCC and LOSLVL sets the input amplitude
September 2005
11 M9999-093005-B
[email protected] or (408) 955-1690

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