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SY58626LMH Datasheet(PDF) 11 Page - Micrel Semiconductor |
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SY58626LMH Datasheet(HTML) 11 Page - Micrel Semiconductor |
11 / 18 page 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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