View ST1284_95303.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

(R)
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 4.7k 2.2k 1k 10%
R2 4.7k 2.2k 5.1k 10%
Rs 33 33 39 10%
C 180pF 220pF 150pF 20%
1/7
ST1284-xxA8/T8
ABSOLUTE MAXIMUM RATINGS (Tamb Symbol VPP 25C) 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 = 25C) 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 A 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 50
+5V
SPECTRUM ANALYSER
- 10.00
ST1284
Vg 50 Vin Vout
- 15.00
- 20.00
- 25.00
- 30.00 1 3 1284 - 01 1284 - 03 10 30 F (MHz) 100 1284 - 02 300 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 IEC61000-4-2 and is already in place in Europe. This test requires that a device tolerates ESD events and remain operational without user intervention. The ST1284-xxA8/T8 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 splitted in 2 stages. As shown in figure A3, 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.
Fig. A3: ST1284 ESD clamping behavior
Rg
S1
R
S2
Rd
VPP
Vinput Voutput
Rd
Rload
VBR
VBR
Device to be protected
ESD Surge
ST1284-xxA8/T8
4/7
ST1284-xxA8/T8
To have a good approximation of the remaining voltages at both Vin and Vout stages, we give the typical dynamical resistance value Rd. By taking into account these following hypothesis : Rt>Rd, Rg>Rd and Rload>Rd, it gives these formulas: Rg .VBR + Rd .VPP Vinput = Rg Rt.VBR + Rd .Vinput Voutput = Rt The results of the calculation done for V PP =8kV, Rg=330 (IEC61000-4-2 standard), V BR=7V (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 (Fig. A5) 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)
Fig. A4: Measurement conditions
ESD SURGE
ST1284 Vinput Voutput
Fig. A5: Remaining voltage at the input and output of the device during a 16kV ESD surge (IEC61000-4-2).
5/7
ST1284-xxA8/T8
PACKAGE MECHANICAL DATA QSOP28 (Plastic)
DIMENSIONS REF.
L
Millimeters Min. Max. 1.75 0.25 0.30 0.25 9.98 6.20
Inches Min. 0.061 0.004 0.008 0.007 0.386 0.228 Max. 0.069 0.010 0.012 0.010 0.393 0.244
A
A b D e a1 S E b1
1.55 0.10 0.20 0.18 9.80 5.79
a1 b b1 D
28 1
15 F 14
F e E L S
0.64 typ. 3.80 0.40 8 max 3.98 0.90
0.025 typ. 0.15 0.016 8 max 0.157 0.035
PACKAGE MECHANICAL DATA TSSOP28 (Plastic)
DIMENSIONS REF. Millimeters Min. A
L
Inches Min. Typ. Max. 0.047 0.006
Typ.
Max. 1.200
A1 A2
0.050 0.800 0.190 0.090 9.600 6.200 4.300
0.150 0.002
A2 aaa b D e A1
A K L1 E1 c
1.000 1.050 0.031 0.039 0.041 0.300 0.007 0.200 0.003 0.012 0.008
b c D
9.700 9.800 0.378 0.382 0.386 6.400 6.600 0.244 0.252 0.260 4.400 4.500 0.169 0.173 0.177 0.650 0.026
28 1
15 E 14
E E1 e L L1 K aaa
0.450
0.600 0.750 0.018 0.024 0.029 1.000 0.039 8d 0.100 0d 8d 0.004
0d
6/7
ST1284-xxA8/T8
FOOTPRINT (QSOP28 / TSSOP28)
dim in mm
0.4
Package General Specifications Lead Plating Tin-Lead 7 m Min 20 m Max Copper Alloy 0.102 mm (0.004") Molded Epoxy Meets UL94V.0 standard
1.7
Lead Plating Thickness
3.7
7.1
Lead Material Lead Coplanarity Body Material Resine
0.65
Order code ST1284-01A8 ST1284-01A8RL ST1284-02A8 ST1284-02A8RL ST1284-03A8RL ST1284-01T8RL ST1284-02T8RL ST1284-03T8RL
Marking ST1284-01 ST1284-01 ST1284-02 ST1284-02 ST1284-03 ST1284-01 ST1284-02 ST1284-03
Package QSOP28 QSOP28 QSOP28 QSOP28 QSOP28 TSSOP28 TSSOP28 TSSOP28
Weight 0.147 g 0.147 g 0.147 g 0.147 g 0.147 g 0.104 g 0.104 g 0.104 g
Delivery mode Tube Tape & Reel Tube Tape & Reel Tape & Reel Tape & Reel Tape & Reel Tape & Reel
Base qty 48 2500 48 2500 2500 2500 2500 2500
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics (c) 2002 STMicroelectronics - Printed in Italy - All rights reserved. STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore Spain - Sweden - Switzerland - United Kingdom - United States. http://www.st.com
7/7

▲Up To Search▲

Price & Availability of ST1284

	To Download ST1284 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .