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SY58626L Datasheet(PDF) 5 Page - Micrel Semiconductor |
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SY58626L Datasheet(HTML) 5 Page - Micrel Semiconductor |
5 / 18 page Micrel, Inc. SY58626L March 2006 5 M9999-030206-B hbwhelp@micrel.com or (408) 955-1690 Pin Description (Continued) Pin Number Pin Name Pin Function 27, 28 TXLBQ, /TXLBQ Transmit loopback differential output: CML compatible output pair with 400mV swing into a 50 Ω 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. 23 /TXQSHDN 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 50 Ω source resistors (connected to VTTOUT) and the external load. Default threshold is Vcc/2 when VTH pin is floating. 2 VTH 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. 21, 20 TXQ, /TXQ 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 50 Ω source termination resistors. When the loopback mode is selected, the TXQ output pair is driven by the RXLBIN inputs. 19, 22 VTTOUT Output termination center-tap: Each side of the differential output pair terminates to the VTTOUT pin through 50 Ω. 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. 17 18 32 MAG_CTRL0 MAG_CTRL1 MAG_CTRL2 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. 10 11 DUR_CTRL0 DUR_CTRL1 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. 9, 15, 26 VCC 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. 3, 6, 16, 25 VEE, Exposed Pad Ground: Ground pins and exposed pad must be connected to the same ground plane. |
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