®
KBMF
EMI FILTER AND LINE TERMINATION
FOR PS/2 MOUSE OR KEYBOARD PORTS
IPAD™
MAIN APPLICATIONS
EMI Filter and line termination for mouse and key-
board ports on:
■
■
■
■
Desktop computers
Notebooks
Workstations
Servers
SOT23-6L
(Plastic)
Table 1: Order Code
Part Number
KBMF01SC6
Figure 1: Functional Diagram
+Vcc
Rp
Rs
FEATURES
■
Integrated low pass filters for Data and Clock
lines
■
Integrated ESD protection
■
Integrated pull-up resistors
■
Small package size
■
Breakdown voltage: V
BR
= 6V min.
DESCRIPTION
On the implementation of computer systems, the
radiated and conducted EMI should be kept within
the required levels as stated by the FCC
regulations. In addition to the requirements of
EMC compatibility, the computing devices are
required to tolerate ESD events and remain
operational without user intervention.
The KBMF implements a low pass filter to limit EMI
levels and provide ESD protection which exceeds
IEC 61000-4-2 level 4 standard. The device also
implements the pull up resistors needed to bias
the data and clock lines. The package is the
SOT23-6L which is ideal for situations where
board space is at a premium.
BENEFITS
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■
■
Marking
KM1
Dat In
C
C
Dat Out
Gnd
+Vcc
Rp
Rs
+Vcc
Clk In
C
C
Clk Out
Rs
Code 01
Tolerance
39Ω
±10%
Rp
4.7kΩ
±10%
C
120pF
±20%
EMI / RFI noise suppression
ESD protection exceeding IEC61000-4-2 level 4
High flexibility in the design of high density
boards
COMPLIES WITH THE FOLLOWING ESD
STANDARDS:
IEC 61000-4-2 (R = 330Ω C = 150pF)
Level 4
±15 kV (air discharge)
±8 kV (contact discharge)
MIL STD 883C, Method 3015-6
Class 3
C = 100pF R = 1500Ω
3 positive strikes and
3 negative strikes (F = 1 Hz)
TM:
IPAD is a trademark of STMicroelectronics.
October 2004
REV. 2
1/8
STMICROELECTRONICS [ STMICROELECTRONICS ]
