廬
ST1284-xxA8/T8
PARALLEL PORT SINGLE TERMINATION
NETWORK WITH 鹵15kV ESD PROTECTION
A.S.D.
TM
MAIN APPLICATIONS
ECP/EPP Parallel Port termination on:
Desktops
Notebooks
Workstations
Servers
PC Peripherals
Set Top Box
s
s
s
s
s
s
QSOP28 / TSSOP28
FEATURES
One device for parallel port termination
Compliant with IEEE1284 standard
EMI / RFI noise filtering
Highly integrated solution in 28 pin QSOP and
TSSOP packages
One single device provides the proper termina-
tion for 8 datalines, 1 strobe line, 4 control lines
and 4 statuts lines
In system ESD protection of 鹵15 kV (air dis-
charge) as per IEC61000-4-2 level 4
s
s
s
s
s
s
SCHEMATIC DIAGRAM
Vcc
R1
Vcc
R1
C
Vcc
R1
C
Vcc
R2
C
1
2
3
4
Rs
C
C
28
27
Vcc
R1
Vcc
R1
Vcc
R1
Vcc
Rs
R1
Vcc
R1
26
25
24
23
Rs
C
Rs
5
C
DESCRIPTION
The ST1284-xxA8/T8 is a highly integrated termi-
nation for enhanced high speed parallel ports. The
integrated termination complies to the IEEE1284
Standard recommendations and government
EMC compatibility requirements. It is built around
two basic cells. The first one (Cell 1) provides line
termination, EMI filtering and ESD protection for
the Strobe and Datalines while the second one
(Cell 2) provides EMI filtering and ESD protection
for the Control and Status lines. In addition,
ST1284-xxA8 provides extra protection against
ESD. When tested according to IEC61000-4-2,
they withstand 鹵8kV contact discharges and
鹵15kV air-discharges, thereby providing to the
system the necessary robustness to meet up to
level 4 of IEC61000-4-2, without the need for addi-
tional ESD protection components. Cells 1 and 2
are described in more detail in figures 1 and 2.
COMPLIES WITH THE FOLLOWING ESD
STANDARDS :
- IEC61000-4-2
鹵15kV (air discharge)
鹵 8kV (contact discharge)
- MIL STD 883E - Method 3015-7 : Class 3
(human body model).
July 2002 - Ed: 1B
6
C
Rs
7
8
9
10
11
12
13
14
Gnd
Vcc
R2
C
Rs
Vcc
R2
C
C
C
22
21
Vcc
R1
Vcc
20
19
18
Rs
Vcc
R2
C
Rs
C
C
Vcc
R1
Vcc
R1
Vcc
R1
C
Vcc
R2
17
16
15
Rs
C
R1
Code 01
Code 02
Code 03
Tolerance
4.7k鈩?/div>
2.2k鈩?/div>
1k鈩?/div>
鹵 10%
R2
4.7k鈩?/div>
2.2k鈩?/div>
5.1k鈩?/div>
鹵 10%
Rs
33鈩?/div>
33鈩?/div>
39鈩?/div>
鹵 10%
C
180pF
220pF
150pF
鹵 20%
1/7
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