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IP4253CZ12-6-TTL Datasheet(PDF) 9 Page - NXP Semiconductors |
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IP4253CZ12-6-TTL Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 18 page IP4251_52_53_54-TTL All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Product data sheet Rev. 2 — 5 May 2011 9 of 18 NXP Semiconductors IP4251/52/53/54-TTL Integrated 4-, 6- and 8-channel passive filter network 6.2 Selection The selection of one of the filter devices has to be performed depending on the maximum clock frequency, driver strength, capacitive load of the sink, and also the maximum applicable rise and fall times. 6.2.1 SDHC and MMC memory interface The Secure Digital High Capacity (SDHC) memory card interface standard specification and the Multi Media Card (MMC) (JESD 84A43) standard specification recommend a rise and fall time of 25 % to 62.5 % (62.5 % to 25 % respectively) of 3 ns or less for the input signal of the receiving interface side. Assuming a typical capacitance of about 20 pF for the SDHC memory card itself, and approximately 4 pF to 7 pF for the Printed-Circuit Board (PCB) and the card holder, IP4252CZ12-6-TTL (6 channels, Rs(ch) =40 Ω, Cch =12pF at Vbias(DC) =2.5 V) is a matching selection to filter and protect all relevant interface pins such as CLK, CMD, and DAT0 to DAT3/CD. Please refer to Figure 7 for a general example of the implementation of the device in an SDHC card interface. In case additional channels such as write-protect or a mechanical card-detection switch are used, the IP4252CZ16-8-TTL (8 channels, Rs(ch) =40 Ω, Cch =12pF at Vbias(DC) = 2.5 V) offers two additional channels. |
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