ST1284 Parallel port single termination network with 15 kV ESD protection Datasheet - production data Features One device for parallel port termination Compliant with IEEE1284 standard EMI / RFI noise filtering Highly integrated solution in 28 pins QSOP package One single device provides the proper termination for 8 data lines, 1 strobe line, 4 control lines and 4 status lines In system ESD protection of 15 kV (air discharge) as per IEC 61000-4-2 level 4 (R) ECOPACK 2 compliant component Complies with the following standards: IEC 61000-4-2 level 4 - 15 kV (air discharge) - 8 kV (contact discharge) MIL STD 883G - Method 3015-7 Class 3 - 25 kV (human body model) Applications ECP/EPP parallel port termination on: Desktops Notebooks Workstations Servers PC peripherals Set top box QSOP28 Description The ST1284-01A8 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 data lines while the second one (cell 2) provides EMI filtering and ESD protection for the Control and Status lines. In addition, ST1284-01A8 provides extra protection against ESD. When tested according to IEC 61000-4-2, they withstand 8 kV contact discharges and 15 kV air discharges, thereby providing to the system the necessary robustness to meet up to level 4 of IEC 61000-4-2, without the need for additional ESD protection components. TM: IPAD is a trademark of STMicroelectronics. May 2012 This is information on a product in full production. Doc ID 6976 Rev 4 1/10 www.st.com 10 ST1284 Figure 1. Schematic diagram 1 2 3 Vcc Vcc R1 R1 R1 Vcc R2 Vcc C C C C 27 Vcc Rs R1 C Rs 26 Vcc R1 4 Rs 5 25 Vcc R1 C 24 Vcc C R1 Rs 6 C Rs 7 28 Vcc 23 Vcc R1 Gnd C 22 R2 8 C Rs 9 Vcc 21 Vcc R1 Vcc C 20 R2 10 C Rs 11 19 Vcc R1 18 Vcc C R2 12 Rs 13 17 Vcc C R1 C Rs 14 2/10 Vcc Vcc R1 C 16 R2 15 C R1 R2 Rs C Code 01 4.7 k 4.7 k 33 180 pF Tolerance 10% 10% 10% 20% Doc ID 6976 Rev 4 ST1284 1 Characteristics Characteristics Table 1. Absolute maximum ratings (Tamb = 25 C) Symbol Parameter Value Unit ESD discharge IEC 61000-4-2, air discharge 16 ESD discharge IEC 61000-4-2, contact discharge 9 IESD discharge - MIL STD 883E - Method 3015-7 25 Supply voltage 5.5 V Pr Power rating per resistor 100 mW PP Package Power rating 1 Top Operating temperature range 0 to + 70 C Tstg Storage temperature range - 55 to + 150 C 125 C VPP VCC Tj Table 2. Symbol IR VBR VF Maximum operating junction temperature kV Electrical characteristics (Tamb = 25 C) Parameter Test condition Leakage current VCC = 5.0 V Breakdown voltage IR = 1 mA Forward voltage drop IF = 50 mA Min. Typ. 6 Max. Unit 10 A V 0.9 V Basic cell configurations The ST1284-01A8 is built around the two basic cells described below which integrate the recommended IEEE1284 network and the ESD protection compatible with IEC 61000-4-2 level 4. Doc ID 6976 Rev 4 3/10 Characteristics Figure 2. ST1284 Cell 1 for line termination, EMI Figure 3. filtering and ESD protection for the data lines and strobe signals Cell 2 for EMI filtering and ESD protection of the control and status signals Vcc Vcc IEEE1284 Recommendation IEEE1284 Recommendation Rp Rp Rs C C Gnd Gnd There are 9 of these cells in the ST1284-xxA8 Figure 4. There are 8 of these cells in the ST1284-xxA8 Functional diagram ST1284-xxA8 Vcc 17 Select in 16 Reset 1 15 Error 14 Autofeed 2 Vcc 28 27 20 1 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 10 11 12 13 4/10 Acknowledge Busy Paper Out Select paper 3 4 5 6 7 9 11 13 14 Vcc 8 14 26 25 24 23 21 19 18 17 16 12 10 15 22 Doc ID 6976 Rev 4 25 Gnd 13 ST1284 2 Application information Application information The functional diagram here above presents a IEEE1284-A connector pinout and show how to connect the ST1284-01A8 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 ST1284-01A8 can be used with all 3 types of connectors defined in the IEEE1284 standard: - IEEE1284-A is a 25 dB connector which is the PC standard for the host connection. - IEEE1284-B is a 36 pin, 0.085 inch center line connector used on the peripheral device. - IEEE1284-C is a new 36 pin, 0.050 inch center line connector which can be used for both host and peripherals. Doc ID 6976 Rev 4 5/10 Technical information ST1284 3 Technical information 3.1 Frequency behavior of data and strobe signals Figure 5. Measurement conditions Figure 6. dB 0.00 +5V TRACKING GENERATOR Typical frequency response curve for data and STROBE signal -5.00 SPECTRUM ANALYSER -10.00 50 -15.00 ST1284 Vg 50 Vin -20.00 Vout -25.00 F (MHz) -30.00 1 3.2 3 10 30 100 300 1,000 ESD protection In addition to the requirements of termination and EMC compatibility, computing devices are required to be tested for ESD susceptibility. This test is described in the IEC 61000-4-2 and is already in place in Europe. This test requires that a device tolerates ESD events and remain operational without user intervention. The ST1284-01A8 is particularly optimized to perform ESD protection. ESD protection is based on the use of device which clamps at: Vouput = VBR + Rd * IPP This protection function is split in 2 stages. As shown in Figure 7, the ESD strikes are clamped by the first stage S1 and then its remaining overvoltage is applied to the second stage through the resistor R. Such a configuration makes the voltage very low at the output. Figure 7. ST1284 ESD clamping behavior Rg S1 Rd VBR ESD Surge 6/10 R S2 Rd Vinput Rload Voutput ST1284-xxA8 Doc ID 6976 Rev 4 VBR Device to be protected ST1284 Technical information To have a good approximation of the remaining voltages at both Vin and Vout stages, we give the typical dynamic resistance value Rd. By taking into account these following hypothesis: Rt>Rd, Rg>Rd and Rload>Rd, it gives these formulas: R g V BR + R d V PP Vinput = -------------------------------------------------Rg R t V BR + R d Vinput Voutput = --------------------------------------------------------Rt The results of the calculation done for VPP = 8 kV, Rg = 330 (IEC 61000-4-2 standard), VBR = 7 V (typ.) and Rd = 1 (typ.) give: - Vinput = 31.2 V - Voutput = 7.95 V This confirms the very low remaining voltage across the device to be protected. It is also important to note that in this approximation the parasitic inductance effect was not taken into account. This could be few tenths of volts during few ns at the input side. This parasitic effect is not present at the output side due the low current involved after the resistance R. The measurements done here after show very clearly (Figure 9) the high efficiency of the ESD protection: - no influence of the parasitic inductances on Vout stage - Voutput clamping voltage very close to VBR (positive strike) and -VF (negative strike) Figure 8. Measurement conditions ESD SURGE ST1284 Vinput Figure 9. Voutput Remaining voltage at the input and output of the device during a 16 kV ESD surge (IEC 61000-4-2) Doc ID 6976 Rev 4 7/10 Package information 4 ST1284 Package information In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) is an ST trademark. Table 3. QSOP28 dimensions Dimensions Ref. Max. Min. Max. 1.55 1.75 0.061 0.069 a1 0.10 0.25 0.004 0.010 b 0.20 0.30 0.008 0.012 b1 0.18 0.25 0.007 0.010 D 9.80 9.98 0.386 0.393 E 3.80 3.98 0.15 0.157 A b S a1 e b1 E D 28 15 F 1 Inches Min. L A Millimeters 14 e 0.64 typ. 0.025 typ. F 5.79 6.20 0.228 0.244 L 0.40 0.90 0.016 0.035 S 8 max 8 max Figure 10. Footprint (dimensions in mm) 0.64 0.40 1.50 3.70 6.70 Table 4. Mechanical specifications Lead plating Lead material Tin-lead 7 m min. 25 m max. Copper Alloy Lead coplanarity 0.102 mm (0.004") Lead plating thickness 8/10 Body material Molded epoxy Resin Meets UL94V-0 standard Doc ID 6976 Rev 4 ST1284 5 Ordering information Ordering information Table 5. Ordering information Order code Marking ST1284-01A8 ST1284-01 ST1284-01A8RL 6 Package Weight QSOP28 0.147 g Base qty Delivery mode 48 Tube 2500 Tape and Reel ST1284-01 Revision history Table 6. Document revision history Date Revision Changes Oct-2003 2B 12-Mar-2010 3 Updated table in Figure 1 and Figure 10. 11-May-2012 4 Updated Table 3. 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