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PDF SY58626L Data sheet ( Hoja de datos )
| Número de pieza | SY58626L | |
| Descripción | Backplane Transmit Buffer | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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SY58626L
DC-to-6.4Gbps Backplane Transmit Buffer
with Selectable Output Pre-emphasis, I/O DC-
Offset Control, and 200mV-3.0VPP Output
Swing
General Description
The SY58626L high-speed, low jitter transmit buffer is
optimized for backplane and transmission line data-path
management applications in Automatic Test Equipment
Features
Precision Edge®
(ATE) and Test & Measurement (T&M) systems. The
buffer includes a CML compatible, variable swing output
with selectable pre-emphasis. The SY58626L is
capable of driving serial data from DC through 6.4Gbps
with a 3VPP (1.5VPK single ended) differential swing.
The SY58626L differential input includes Micrel’s
unique, 3-pin input termination architecture that directly
• Transmit driver provides output pre-emphasis to
extend transmission range
• 4 selectable pre-emphasis levels
• Drives 6.4Gbps up to 12" FR4 PCB trace, or longer
combinations of FR4+cable+interconnect
• DC through 6.4Gbps data rate throughput
interfaces to any DC- or AC-coupled, differential signal • Integrated loopback capability
as small as 100mVPK without any termination resistor • Unique pre-emphasis:
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magnitude
duration
pin interfaces
to
any
programmed with a three-bit interface. Unlike other
differential AC- or DC-coupled signals
transmitter solutions, the output pre-emphasis duration
can be programmed from 60ps to 400ps.
- 50Ω source terminated CML outputs minimize
round-trip reflections
The SY58626L operates at 3.3V ±10% supply and is
guaranteed over the commercial temperature range of
- Programmable output swing control: 200mV-
3.0VPP
0°C to +70°C. The SY58626L transmitter is optimized to
- Output Disable and output shutdown
work with the SY58627L receiver. The SY58626L is part
of Micrel’s high-speed, Precision Edge® product line.
Data sheets and support documentation can be found
on Micrel’s website at: www.micrel.com.
- DC-offset control with VTT I/O
• 3.3V ±10% supply voltage
• 0°C to +70°C temperature range
• Available in 32-pin (5mm x 5mm) MLFTM package
Applications
• ATE, T&M backplane management
• Combination FR4+cable+interconnect driver
• Cable drivers
• Electrical interface and interconnect applications that
require DC-offset control
Precison 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
March 2006
M9999-030206-B
[email protected] or (408) 955-1690
1 page  
Micrel, Inc.
SY58626L
Pin Description (Continued)
Pin Number
27, 28
23
2
21, 20
19, 22
17
18
32
10
11
9, 15, 26
3, 6, 16, 25
Pin Name
TXLBQ,
/TXLBQ
/TXQSHDN
VTH
TXQ,
/TXQ
VTTOUT
MAG_CTRL0
MAG_CTRL1
MAG_CTRL2
DUR_CTRL0
DUR_CTRL1
VCC
VEE,
Exposed Pad
Pin Function
Transmit loopback differential output: CML compatible output pair with 400mV swing
into a 50Ω load (100Ω across the pair). The TXLBQ output pair is providing a copy of
the TXIN input signal, bypassing the pre-emphasis stage. The SY58626L loopback
function is optimized to operate with the SY58627L receiver, and the TXLBQ output
pair is AC-coupled directly to the TXLBIN input pair on the SY58627L.
TXQ shutdown control pin: The TTL/CMOS (or VTH controlled) compatible pin is an
active LOW function. This input is internally connected to a 25kΩ pull-up resistor and
will default to a logic HIGH state if left open. When pulled LOW, the TXQ and /TXQ
output currents are shut off, and the TXQ and /TXQ output voltage is set to the same
potential. The actual voltage level is set by the resistor divider ratio established by
the internal 50Ω source resistors (connected to VTTOUT) and the external load.
Default threshold is Vcc/2 when VTH pin is floating.
Input logic threshold control voltage for logic control threshold settings other than
LVTTL/CMOS. This input control pin can be externally biased to set the proper
threshold for all the logic control pins, /TXEN, LBSEL, /TXLBEN, 3-bit pre-emphasis
control, 2-bit pre-emphasis duration control, and /TXQSHDN. For standard
LVTTL/CMOS control, simply leave the VTH pin floating and the threshold voltage
defaults to VCC/2 (When VEE=0V). For LVPECL thresholds, set VTH to Vcc-1.3V.
Differential variable swing output pair: This CML output pair is the output of the
device. This output is designed to drive 100mVPK to 1.5VPK into 50Ω (100Ω across
the pair) with variable pre-emphasis. TXQ outputs include 50Ω source termination
resistors. When the loopback mode is selected, the TXQ output pair is driven by the
RXLBIN inputs.
Output termination center-tap: Each side of the differential output pair terminates to
the VTTOUT pin through 50Ω. The VTTOUT pin provides a center-tap to the output
termination network for maximum interface flexibility, and DC-offset capability.
Please refer to the “CML Output Interface Applications” section for more details.
Pre-emphasis magnitude level control input: TTL/CMOS (or VTH controlled)
compatible, 3-bit control interface. There are four levels of pre-emphasis magnitude,
as shown in the “Pre-Emphasis Magnitude Truth Table.” When MAG_CTRL2 (MSB)
is logic 1, pre-emphasis is disabled and the TXQ outputs will not include any pre-
emphasis. Pre-emphasis magnitude ranges from 10% to 33% above the base swing.
Pre-emphasis duration control input. TTL/CMOS (or VTH controlled) compatible, 2-bit
control interface. This control establishes the pre-emphasis duration. Duration ranges
from 60ps to 400ps typical as shown in the “Pre-emphasis Duration Control Truth
Table.” Pre-emphasis duration is measured from the mid-point of the pre-emphasis
magnitude (50% point). Please refer to the “Pre-emphasis Output Description” for
details.
Positive power supply: Connect to +3.3V power supply. Bypass with 0.1µF//0.01µF
low ESR capacitors as close to VCC pins as possible.
Ground: Ground pins and exposed pad must be connected to the same ground
plane.
March 2006
5 M9999-030206-B
[email protected] or (408) 955-1690
5 Page 
Micrel, Inc.
Detailed Description
The SY58626L is a high speed, low jitter transmit
buffer with integrated loopback capability. Adjustable
pre-emphasis amplitudes and selectable pre-emphasis
durations are included with the transmitter. The
SY58626L also includes disable and shutdown control
for the transmitter output.
Transmitter
The SY58626L transmitter includes the VTTIN and
VTTOUT pin for maximum interface flexibility and DC-
offset capability for the input and output, respectively.
This feature allows for interfacing with different logic
families without the use of AC-coupling. The output
buffer has internal 50Ω source terminated CML
outputs for minimizing round-trip reflections.
SY58626L
• Control of the transmitter output swing buffer
can be obtained by using a variable resistor
connected between VREF-CTRL and VCC
with the wiper driving TXVCTRL. Please refer
to Figure 1 for more details.
Transmitter Disable and Shutdown
The SY58626L provides two methods to turn off the
output when desired. When /TXEN is pulled HIGH, the
transmitter output pair is disabled. TXQ goes to a LOW
state and /TXQ goes to a HIGH state. When
/TXQSHDN is pulled LOW, the transmitter output pair
is in shutdown mode. TXQ and /TXQ output currents
are shut off and the TXQ and /TXQ outputs are set to
the same potential. The threshold for the /TXEN and
/TXQSHDN pins is set with the VTH pin. Please refer
to the “Typical Operating Characteristics” for more
details.
Loopback
The SY58626L features a loopback test mode,
activated by setting LBSEL to logic HIGH. Using the
SY58626L with the SY58627L enables local loopback
and link side loopback, shown in Figures 2b and 2c.
This mode enables an external loopback path,
bypassing circuitry on both local and link side. Please
refer to Table 1 and Figure 3 for Loopback Control
information.
Figure 1. Variable Output Swing Circuit
Transmitter Variable-Swing Output Buffer
• Connecting VREF-CTRL to TXVCTRL sets the
transmitter output buffer to max swing 1.5VPK
(3.0VPP).
• Connecting VCC to TXVCTRL sets the
transmitter output buffer to minimum swing
100mVPK (200mVPP).
• Connecting VREF-FIXED to TXVCTRL sets
the transmitter output buffer to 400mVPK
(800mVPP).
March 2006
11
Figure 2a. Normal Operation
M9999-030206-B
[email protected] or (408) 955-1690
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet SY58626L.PDF ] | |
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