IP4251 datasheet(10/16 Pages) NXP

Part #	IP4251

Description	Integrated 4-, 6- and 8-channel passive filter network with ESD protection to IEC 61000-4-2, level 4

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Manufacturer	NXP [NXP Semiconductors]

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IP4251_52_53_54_3

Product data sheet

Rev. 03 — 6 May 2009

10 of 16

NXP Semiconductors

IP4251/52/53/54

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

To generate SDHC- and MMC-compliant digital signals, the driver strength should not

signiﬁcantly undercut 8 mA.

7.2.2 LCD interfaces, medium-speed interfaces

For digital interfaces such as LCD display interfaces running at clock speeds between

10 MHz and 25 MHz or more, IP4251, IP4252, or IP4254 can be used in dependency of

the sink load, clock speed, driver strength and rise and fall time requirements. Also the

minimum EMI ﬁlter requirements may be a decision-making factor.

7.2.3 Keypad, low-speed interfaces

Especially for lower-speed interfaces such as keypads, low-speed serial interfaces (e.g.

RS232) and low-speed control signals, IP4253 (Rs(ch) = 200 Ω, Cch = 30 pF at

Vbias(DC) = 2.5 V) offers a very robust ESD protection and strong suppression of unwanted

frequencies (EMI-ﬁltering).

Fig 8.

Example of IP4252 in an MMC interface

001aaj309

IP4252CZ12-6

IP4252CZ8-4

DAT1

pull-up resistors

50 k

Ω - 100 kΩ

CMD pull-up

4.7 k

Ω - 100 kΩ

DAT1

C8

e.g.

RSMMC

HOST

INTERFACE

DAT0

C7

DAT7

C13

VSS2

C6

DAT6

C12

CLK

C5

VCC(VMMC)

C4

VSS1

C3

DAT5

C11

CMD

C2

DAT4

C10

DAT3

C1

DAT2

CMD

DAT4

DAT3

DAT2

C9

DAT0

DAT7

DAT6

CLK

DAT5

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