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GS3281 Datasheet(PDF) 7 Page - Semtech Corporation |
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GS3281 Datasheet(HTML) 7 Page - Semtech Corporation |
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7 / 97 page  GS3281 Final Data Sheet Rev.7 PDS-061453 January 2019 7 of 97 Semtech Proprietary & Confidential www.semtech.com 18 GPIO1 Digital Input/Output Multi-function Control/Status Input/Output 1. Default function: Direction = Output Signal = HIGH indicates PLL is locked Pin is 1.8V CMOS I/O, please refer to GPIO1_CFG for more information on how to configure GPIO1. 19, 31, 37, 38 VEE_CORE Power Most negative power supply connection for the analog core. Connect to ground. 20 VCCO1P8_1 Power Most positive power supply connection for cable driver pre driver. Connect to 1.8V and decouple to ground. See Section 6.1 Typical Application Circuit for values. 21, 28 VEEO Power Most negative power supply connection for the output drivers. Connect to ground. 22, 23 SDO1/RCO, SDO1/RCO Output Differential CML output with two internal 75Ω pull-ups. The data signal or PRBS generator can be selected for this output. The PRBS generator can be configured to generate a PRBS7 or a clock pattern. Note: If one of the two outputs is not used by the application, ensure that it is connected to ground through a capacitor and resistor. See Section 6.1 Typical Application Circuit for values. 24 VCCO_1 Power Most positive power supply connection for the SDO1/ SDO1 output driver. Connect to 2.5V or 3.3V and decouple to ground. See Section 6.1 Typical Application Circuit for values. 25 VCCO_0 Power Most positive power supply connection for the SDO/SDO0 output driver. Connect to 2.5V or 3.3V and decouple to ground. See Section 6.1 Typical Application Circuit for values. 26, 27 SDO0, SDO0 Output Differential CML output with two internal 75Ω pull-ups. The data signal or PRBS generator can be selected for this output. The PRBS generator can be configured to generate a PRBS7 or a clock pattern. Note: If one of the two outputs is not used by the application, ensure that it is connected to ground through a capacitor and resistor. See Section 6.1 Typical Application Circuit for values. 29 VCCO1P8_0 Power Most positive power supply connection for cable driver pre driver. Connect to 1.8V and decouple to ground. See Section 6.1 Typical Application Circuit for values. 32 REF_CLK Digital Input Optional 27MHz reference input. 1.8V CMOS input with 100kΩ pull-down. Connect to ground if not used. Table 1-1: GS3281 Pin Descriptions (Continued) Pin Number Name Type Description |
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