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9DB403DGLF Datasheet(PDF) 14 Page - Integrated Device Technology |
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9DB403DGLF Datasheet(HTML) 14 Page - Integrated Device Technology |
14 / 19 page IDTTM/ICSTM Four Output Differential Buffer for PCIe Gen 1 and Gen 2 ICS9DB403D REV L 10/07/09 ICS9DB403D Four Output Differential Buffer for PCIe for Gen 1 and Gen 2 14 The PD# pin cleanly shuts off all clocks and places the device into a power saving mode. PD# must be asserted before shutting off the input clock or power to insure an orderly shutdown. PD is asynchronous active-low input for both powering down the device and powering up the device. When PD# is asserted, all clocks will be driven high, or tri-stated (depending on the PD# drive mode and Output control bits) before the PLL is shut down. PD#, Power Down When PD# is sampled low by two consecutive rising edges of DIF#, all DIF outputs must be held High, or tri-stated (depending on the PD# drive mode and Output control bits) on the next High-Low transition of the DIF# outputs. When the PD# drive mode bit is set to ‘0’, all clock outputs will be held with DIF driven High with 2 x IREF and DIF# tri-stated. If the PD# drive mode bit is set to ‘1’, both DIF and DIF# are tri-stated. PD# Assertion Power-up latency is less than 1 ms. This is the time from de-assertion of the PD# pin, or VDD reaching 3.3V, or the time from valid SRC_IN clocks until the time that stable clocks are output from the device (PLL Locked). If the PD# drive mode bit is set to ‘1’, all the DIF outputs must driven to a voltage of >200 mV within 300 us of PD# de-assertion. PD# De-assertion PWRDWN# DIF DIF# PWRDWN# DIF DIF# Tstable <1mS Tdrive_PwrDwn# <300uS, >200mV Note: Polarities in timing diagrams are shown OE_INV = 0. They are similar to OE_INV = 1. |
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