PARALLEL PORT SINGLE TERMINATION NETWORK
Description
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ST1284-xxA8/T8
PARALLEL PORT SINGLE TERMINATION NETWORK WITH ±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 termination for 8 datalines, 1 strobe line, 4 control lines and 4 statuts lines In system ESD protection of ±15 kV (air discharge) 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 termination 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 additional 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).
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
...
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