this is information on a product in full production. may 2012 doc id 6976 rev 4 1/10 10 st1284 parallel port single termination network with 15 kv esd protection datasheet ? production data features one device for paralle l 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 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 tm: ipad is a trademark of stmicroelectronics. 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 compatibil ity 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 th e necessary robustness to meet up to level 4 of iec 61000-4-2, without the need for additional esd protection components. qsop28 www.st.com
st1284 2/10 doc id 6976 rev 4 figure 1. schematic diagram 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 vcc vcc vcc vcc vcc vcc vcc vcc vcc vcc vcc vcc vcc gnd vcc vcc vcc vcc vcc r1 c r1 c r1 r2 c r1 r1 r1 r1 r1 r2 r1 r2 r1 r2 r1 r1 r2 c rs c rs c rs c rs c rs c rs c rs c rs rs c c c c c c r1 r2 rs c code 01 4.7 k 4.7 k 33 180 pf tolerance 10% 10% 10% 20%
st1284 characteristics doc id 6976 rev 4 3/10 1 characteristics 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. table 1. absolute maximum ratings (t amb = 25 c) symbol parameter value unit v pp esd discharge iec 61000-4-2, air discharge 16 kv esd discharge iec 61000-4-2, contact discharge 9 iesd discharge - mil std 883e - method 3015-7 25 v cc supply voltage 5.5 v p r power rating per resistor 100 mw p p package power rating 1 t op operating temperature range 0 to + 70 c t stg storage temperature range - 55 to + 150 c t j maximum operating junction temperature 125 c table 2. electrical characteristics (t amb = 25 c) symbol parameter test condition min. typ. max. unit i r leakage current v cc = 5.0 v 10 a v br breakdown voltage i r = 1 ma 6 v v f forward voltage drop i f = 50 ma 0.9 v
characteristics st1284 4/10 doc id 6976 rev 4 figure 4. functional diagram figure 2. cell 1 for line termination, emi filtering and esd protection for the data lines and strobe signals figure 3. cell 2 for emi filtering and esd protection of the control and status signals c ieee1284 recommendation vcc gnd rp rs there are 9 of these cells in the st1284-xxa8 c ieee1284 recommendation vcc gnd rp there are 8 of these cells in the st1284-xxa8 14 autofeed 15 error 16 reset 17 select in 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 13 select paper 14 1 13 25 1 28 2 27 20 26 25 24 23 21 19 18 17 16 3 4 5 6 7 9 11 13 14 8 10 12 15 22 10 acknowledge 11 busy 12 paper out vcc vcc vcc gnd st1284-xxa8
st1284 application information doc id 6976 rev 4 5/10 2 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 (r p ) and a filter capacitor (c). the data lines (from 2 to 9) and the strobe (pin 1) also require a termination series resistor (r s ) in addition to the pull-up resistor and a filter capacitor. the v cc is connected to pin 20 and the ground to pin 22. the st1284-01a8 can be used with all 3 types of conn ectors defined in the ieee1284 standard: ? ieee1284-a is a 25 db co nnector which is the pc standard for the host connection. ? ieee1284-b is a 36 pin, 0. 085 inch center li ne connector used on the peripheral device. ? ieee1284-c is a new 36 pin, 0.050 inch center line co nnector which can be used for both host and peripherals.
technical information st1284 6/10 doc id 6976 rev 4 3 technical information 3.1 frequency behavior of data and strobe signals 3.2 esd protection in addition to the requiremen ts of termination and emc comp atibility, computing devices are required to be tested for esd susceptibility. th is test is described in the iec 61000-4-2 and is already in place in europe. this test requ ires 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: v ouput = v br + r d i pp this protection function is split in 2 stages. as shown in figure 7 , the esd strikes are clamped by the first stage s 1 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 figure 5. measurement conditions figure 6. typical frequency response curve for data and strobe signal st1284 spectrum analyser tracking generator vg vout vin 50 50 +5v 1 3 10 30 100 300 1,000 -30.00 -25.00 -20.00 -15.00 -10.00 -5.00 0.00 db f (mhz) esd surge vinput voutput rload rg r s1 rd v br v br device to be protected st1284-xxa8 rd s2
st1284 technical information doc id 6976 rev 4 7/10 to have a good approximation of the remaining voltages at both v in and v out stages, we give the typical dynamic resistance value r d . by taking into account these following hypothesis: r t >r d , r g >r d and r load >r d , it gives these formulas: the results of the calculation done for v pp = 8 kv, r g = 330 (iec 61000-4-2 standard), v br = 7 v (typ.) and r d = 1 (typ.) give: ?v input = 31.2 v ?v output = 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 v out stage ?v output clamping voltage very close to v br (positive strike) and -v f (negative strike) figure 8. measurement conditions figure 9. remaining voltage at the input and output of the device during a 16 kv esd surge (iec 61000-4-2) vinput r g v br r d v pp ? + ? r g --------------------------------------------------- = voutput r t v br r d vinput ? + ? r t --------------------------------------------------------- - = st1284 vinput voutput esd surge
package information st1284 8/10 doc id 6976 rev 4 4 package information in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark. figure 10. footprint (dimensions in mm) table 3. qsop28 dimensions ref. dimensions millimeters inches min. max. min. max. a 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 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 table 4. mechanical specifications lead plating tin-lead lead plating thickness 7 m min. 25 m max. lead material copper alloy lead coplanarity 0.102 mm (0.004?) body material molded epoxy resin meets ul94v-0 standard 28 15 14 1 b a1 e s l e f d b1 a 0.64 0.40 6.70 3.70 1.50
st1284 ordering information doc id 6976 rev 4 9/10 5 ordering information 6 revision history table 5. ordering information order code marking package weight base qty delivery mode st1284-01a8 st1284-01 qsop28 0.147 g 48 tube st1284-01a8rl st1284-01 2500 tape and reel table 6. document revision history date revision changes oct-2003 2b last release. 12-mar-2010 3 updated table in figure 1 and figure 10. 11-may-2012 4 updated ta bl e 3 .
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