KBMF01SC6 데이터 시트보기 (PDF) - STMicroelectronics

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KBMF01SC6

EMI FILTER AND LINE TERMINATION FOR PS/2 MOUSE OR KEYBOARD PORTS

STMicroelectronics 

KBMFxxSC6

TECHNICAL INFORMATION

EMI FILTERING

The KBMFxxSC6 ensure a filtering protection against ElectroMagnetic and RadioFrequency Interferences

thanks to its low-pass filter structure. This filter is characterized by the following parameters :

- cut-off frequency

- Insertion loss

- high frequency rejection

Fig. A1: Measurements configuration

Fig. A2: KBMFxxSC6 attenuation curve

Insertion loss (dB)

0

50 Ω TG OUT

Vg

TEST BOARD

RF IN

50 Ω

-10

-20

-30

-40

1

10

100

F (MHz)

1000

ESD PROTECTION

The KBMFxxSC6 is particularly optimized to perform ESD protection. ESD protection is based on the use

of device which clamps at :

Vouput = VBR + Rd.IPP

This protection function is splitted in 2 stages. As shown in figure A3, the ESD strikes are clamped by the

first stage S1 and then its remaining overvoltage is applied to the second stage through the resistor R.

Such a configuration makes the output voltage very low at the Voutput level.

Fig. A3: ESD clamping behavior

VPP

ESD Surge

Rg

S1

Rs

S2

Rd

Vinput

Rd

VBR

Voutput

VBR

KBMFxxSC6

Rload

Device

to be

protected

3/8

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