IP4251_52_53_54_3

© NXP B.V. 2009. All rights reserved.

Product data sheet

Rev. 03 — 6 May 2009

9 of 16

NXP Semiconductors

IP4251/52/53/54

Integrated 4-, 6- and 8-channel passive filter network

The capacitance values specified for the signal channels of the MMC interface differ from

the SD(HC) specification. The MMC card side interface is specified to have an intrinsic

capacitance of 12 pF to 18 pF and the total channel is limited according the specification

to 30 pF only. Therefore, any filter device capacitance is limited to a maximum of up to

18 pF, including the card holder and PCB traces.

Please refer to Figure 8 for a general example of the implementation of the IP4252 in a

MultiMediaCard interface application.

Fig 7.

Example of IP4252 in an SD(HC) card interface

001aaj310

IP4252CZ12-6

(IP4252CZ16-8)

DAT1

pull-up resistors

10 k

Ω − 100 kΩ

10 k

Ω − 90 kΩ

DAT3/CD pull-up

10 k

Ω − 100 kΩ

DAT3/CD pull-up

>270 kΩ

exact value

depends on

required

logic levels

DAT1

SD MEMORY

CARD

SET_CLR_

CARD_DETECT

(ACMD42)

to HOST

INTERFACE

DAT0

GND

CLK

DAT3/CD

CMD

DAT2

optional:

2-additional channels

of IP4252CZ16-8

optional:

write protect switch

optional:

electrical card detect

WP

DAT0

CLK

CMD

DAT3/CD

DAT2

CD

WP

optional:

card detect switch

CD