SY58626LMH datasheet(11/18 Pages) MICREL

Part #	SY58626LMH

Description	DC-to-6.4Gbps Backplane Transmit Buffer with

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Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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Micrel, Inc.

SY58626L

June 2007

11

M9999-061207-C

hbwhelp@micrel.com or (408) 955-1690

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 50

Ω source terminated CML

outputs for minimizing round-trip reflections.

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).

•

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 2a. Normal Operation

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