ST1284-XXA8_03 Datasheet, PDF (1/6 Pages) STMicroelectronics – PARALLEL PORT SINGLE TERMINATION NETWORK WITH ±15kV ESD PROTECTION

®
A.S.D.^TM
ST1284-xxA8
PARALLEL PORT SINGLE TERMINATION
NETWORK WITH ±15kV ESD PROTECTION
MAIN APPLICATIONS
ECP/EPP Parallel Port termination on:
s Desktops
s Notebooks
s Workstations
s Servers
s PC Peripherals
s Set Top Box
FEATURES
s One device for parallel port termination
s Compliant with IEEE1284 standard
s EMI / RFI noise filtering
s Highly integrated solution in 28 pin QSOP
packages
s One single device provides the proper termina-
tion for 8 datalines, 1 strobe line, 4 control lines
and 4 statuts lines
s In system ESD protection of ±15 kV (air dis-
charge) as per IEC61000-4-2 level 4
DESCRIPTION
The ST1284-xxA8 is a highly integrated termina-
tion 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 ±8kV contact discharges and
±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
±15kV (air discharge)
± 8kV (contact discharge)
- MIL STD 883E - Method 3015-7 : Class 3
(human body model).
QSOP28
SCHEMATIC DIAGRAM
Vcc
Vcc
Vcc
Vcc
R1
R1
R1
R2
1
28
C
C
C
C
2
27
Vcc
Rs ^R1
3
C
Vcc
26
Rs ^R1
4
C
Vcc
25
Rs ^R1
5
C
Vcc
24
6
7
Vcc
R2
Rs R1
C
Vcc
Rs ^R1
C
23
Gnd
22
8
C
Vcc
21
Rs ^R1
9
Vcc
C
Vcc
20
R2
10
C
Vcc
19
11
Vcc
Rs ^R1
18
C
R2
12
C
Vcc
17
Rs ^R1
13
C
Vcc
Vcc
16
Rs ^R1
R2
14
15
C
C
R1
Code 01 4.7kΩ
Code 02 2.2kΩ
Code 03 1kΩ
Tolerance ± 10%
R2
4.7kΩ
2.2kΩ
5.1kΩ
± 10%
Rs
33Ω
33Ω
39Ω
± 10%
C
180pF
220pF
150pF
± 20%
October 2003 - Ed: 2B
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