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DS32EL0421SQX Datasheet(PDF) 11 Page - Texas Instruments |
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DS32EL0421SQX Datasheet(HTML) 11 Page - Texas Instruments |
11 / 32 page Current Cycle Previous Cycle Next Cycle Input Transmit Clock A0 A1 A2 A3 B0 B1 B2 B3 C0 C1 C2 C3 D0 D1 D2 D3 E0 E1 E2 E3 LVDS Data-0 LVDS Data-1 LVDS Data-2 LVDS Data-3 LVDS Data-4 Serialized CML Output First Bit Out Last Bit Out DS32EL0421, DS32ELX0421 www.ti.com SNLS282F – MAY 2008 – REVISED APRIL 2013 Figure 6. 5-Bit Parallel LVDS Inputs Mapped to CML Output FUNCTIONAL DESCRIPTION POWER SUPPLIES The DS32EL0421 and DS32ELX0421 have several power supply pins, at 2.5V as well as 3.3V. It is important that these pins all be connected and properly bypassed. Bypassing should consist of parallel 4.7 μF and 0.1μF capacitors as a minimum, with a 0.1 μF capacitor on each power pin. A 22 μF capacitor is required on the VDDPLL pin which is connected to the 3.3V rail. These devices have a large contact in the center on the bottom of the package. This contact must be connected to the system GND as it is the major ground connection for the device. POWER UP It is recommended, although not necessary, to bring up the 3.3V power supply before the 2.5V supply. If the 2.5V supply is powered up first, an initial current draw of approximately 600mA from the 2.5V rail may occur before settling to its final value. Regardless of the sequence, both power rails should monotonically ramp up to their final values. POWER MANAGEMENT These devices have two methods to reduce power consumption. To enter the first power save mode, the on board host FPGA or controlling device can cease to output the DDR transmit clock. To further reduce power consumption, write 40'h to register 26'h and 10'h to register 01'h. This will put the device in its lowest power consumption mode. RESET There are three ways to reset these devices. A reset occurs automatically during power-up. The device can also be reset by pulling the RESET pin low, with normal operation resuming when the pin is driven high again. The device can also be reset by writing to the reset register. This reset will put all of the register values back to their default values, except it will not affect the address register value if the SMBus default address has been changed. Copyright © 2008–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: DS32EL0421 DS32ELX0421 |
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