Document
www.DataSheet4U.com
®
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
17 16 15
Rs
C
R1 Code 01 Code 02 Code 03 Tolerance 4.7kΩ 2.2kΩ 1kΩ ± 10%
R2 4.7kΩ 2.2kΩ 5.1kΩ ± 10%
Rs 33Ω 33Ω 39Ω ± 10%
C 180pF 220pF 150pF ± 20%
1/7
ST1284-xxA8/T8
ABSOLUTE MAXIMUM RATINGS (Tamb Symbol VPP 25°C) Value ±16 ±9 ±25 5.5 100 1 0 to +70 -55 to +150 125 Unit kV kV kV V mW W °C °C °C
Parameter ESD discharge IEC61000-4-2, air discharge ESD discharge IEC61000-4-2, contact discharge ESD discharge - MIL STD 883E - Method 3015-7
Vcc Pr PP Top Tstg Tj
Supply voltage Power rating per resistor Package Power rating Operating temperature range Storage temperature range Maximum operating junction temperature
ELECTRICAL CHARACTERISTICS (Tamb = 25°C) Symbol IR VBR VF Parameter Leakage current Breakdown voltage Forward voltage drop Test condition Vcc = 5.0V IR = 1mA IF = 50mA 6 0.9 Min. Typ. Max. 10 Unit µA V V
BASIC CELL CONFIGURATIONS The ST1284-xxA8/T8 is built around the two basic cells described below which integrate the recommended IEEE1284 network and the ESD protection compatible with IEC61000-4-2 level 4
Fig. 1:Cell 1 for line termination, EMI filtering and ESD protection for the Datalines and Strobe signals. There are 9 of these cells inside the ST1284-xxA8/T8
Fig. 2: Cell 2 for EMI filtering and ESD protection of the Control and Status signals. There are 8 of these cells inside the ST1284-xxA8/T8
Vcc
IEEE1284 Recommendation
Vcc
IEEE1284 Recommendation
Rp Rs
Rp
C
C
Gnd
2/7
Gnd
ST1284-xxA8/T8
FUNCTIONAL DIAGRAM
ST1284-xxA8/T8
Vcc
17 Select in 16 Reset 15 Error 14 Autofeed
1 2
28 27
Vcc
1 Strobe 2 Bit 1 3 Bit 2 4 Bit 3 5 Bit 4 6 Bit 5 7 Bit 6 8 Bit 7 9 Bit 8
20
1
3 4 5 6 7 9 11 13 14 8 10
Vcc
26 25 24 23 21 19 18 17 16 12 15 22
14
10 11 12 13
Acknowledge Busy Paper Out Select paper
25
Gnd
13
APPLICATION INFORMATION The functional diagram here above presents a IEEE1284-A connector pinout and show how to connect the ST1284-xxA8/T8 in order to correctly terminate and filter the 17 signal lines. The IEEE1284-A connector is the PC standard for the host connection. Control and status lines (from 10 to 17) only require a pull-up resistor (Rp) and a filter capacitor (C). The data lines (from 2 to 9) and the STROBE (pin 1) also require a termination series resistor (Rs) in addition to the pull-up resistor and a filter capacitor. The Vcc is connected to pin 20 and the ground to pin 22. The ST1284-xxA8/T8 can be used with all 3 types of connectors defined in the IEEE1284 standard: - IEEE1284-A is a 25DB connector which is the PC standard for the host connection. - IEEE1284-B is a 36 pin, 0.085 inch centerline connector used on the peripheral device. - IEEE1284-C is a new 36 pin, 0.050 inch centerline connector which can be used for both host and peripherals.
3/7
ST1284-xxA8/T8
TECHNICAL INFORMATION FREQUENCY BEHAVIOR OF DATA AND STROBE SIGNALS Fig. A1: Measurement conditions Fig. A2: Typical frequency response curve for data and strobe signals.
0.00 dB - 5.00
TRACKING GENERATOR 50Ω
+5V
SPECTRUM ANALYSER
- 10.00.