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ST1284| Datasheet

By datasheet - April 3rd, 2008

ST1284, ST1284-01A8, ST1284-01A8RL, ST1284-02A8RL, ST1284-03A8RL

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ST1284-xxA8
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 FEATURES One device for parallel port termination Compliant with IEEE1284 standard EMI / RFI noise filtering Highly integrated solution in 28 pin QSOP 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 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 b
ody model).
October 2003 - Ed: 2B

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 2.2k 1k 10%

R2 4.7k 2.2k 5.1k 10%

Rs 33 33 39 10%

C 180pF 220pF 150pF 20%
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