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| AN8612NSR SCSI Active Terminator IC s Overview The AN8612NSR is a terminator IC complying with the standard interface standards [SCSI-I/II] for personal computer, work station and various information equipment. Fixed resistor and regulator which are separately provided in conventional ICs are incorporated in single chip for the AN8612NSR. The stand-by function is also built in the AN8612NSR. Moreover, this IC can easily satisfy the maximum terminal capacitance of 25 pF of the SCSI-II standard, because of its small output terminal capacitance. It can support the 10 M byte/s of SCSI-II and 20 M bytes/s of Fast-20. 0.40.25 (6.0) (4.6) 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 Unit : mm (0075) 0.10.1 1.45 s Features * Active termination of 18 signal lines * Low consumption power owing to stand-by function built-in (100A in stand-by condition) * Small output terminal capacitance : 4.5 pF, typ. * High accuracy regulator : 2.85V60mV 0.5 8.40.3 11.730.3 Number in ( ) is a reference value. 24-pin SOP Package (HSOP024-P-0450) s Application SCSI interface board of PC SCSI equipment such as CD-ROM, MO, PD and MD printer s Block Diagram VCC 12 13 + - + 1 0.1F 1F 18 17 16 Thermal Shut Down 15 14 11 10 Band Gap Reference 9 8 7 5 4 3 2 23 22 STANDBY 24 21 20 SG SG SG SG SG SG SG SG SG SG SG SG SG SG SG SG SG SG LINE 1 LINE 2 LINE 3 LINE 4 LINE 5 LINE 6 LINE 7 LINE 8 LINE 9 LINE 10 LINE 11 LINE 12 LINE 13 LINE 14 LINE 15 LINE 16 LINE 17 LINE 18 6 19 1.45 (0.2) 3.150.2 16.00.3 (7.8) (9.2) 1.27 s Absolute Maximum Rating (Ta=25C) Parameter Supply voltage Supply current Power dissipation Note) Operating ambient temperature Storage temperature Symbol VCC ICC PD Topr Tstg Rating - 0.3 to + 7.0 500 2250 -20 to + 60 -55 to + 150 Unit V mA mW C C Note) Ta=60C and printed board (80.0 x 80.0 x 1.2mm) s Recommended Operation Range (Ta=25C) Parameter Operating supply voltage Symbol VCC Range 4.0V to 5.5V s Electrical Characteristics (VCC=5.0V, Ta=252C) Parameter Supply current 1 Supply current 2 Supply current 3 STANDBY terminal "L" input current STANDBY terminal "L" input current STANDBY terminal positive direction Threshold voltage STANDBY terminal negative direction Threshold voltage Maximum output current SGLINE1-18 Output leak current 1 SGLINE1 to 18 Output leak current 2 SGLINE1 to 18 REG * output voltage REG * output voltage Termination resistance value SGLINE1 to 18 "H" level output voltage SGLINE1 to 18 STANDBY terminal hysteresis width Output terminal capacitance Thermal shut-down temperature Symbol ICC1 ICC2 ICC3 ISTBYL ISTBYH VTH+ VTH- ISG ILK1 ILK2 VREG1 VREG2 RSG VSGH VHYS CSG TTSD VSG=0.2V VCC=5.5V STANDBY=open, VSG=0V VCC=5.5V STANDBY=open, VSG=2.85V VCC=4.0 to 5.5V All SGLINE=open VCC=3.2V All SGLINE=open ISG=5mA to 15mA VCC=4.0 to 5.5V All SGLINE=open Condition STANDBY= "L" All SGLINE=open STANDBY= "L" All SGLINE=0.2V STANDBY=open VCC=5.5V, VI=0V VCC=5.5V, VI=5.5V 1.3 1.1 19.8 -1 -1 2.79 2.00 107 2.78 115 2.85 (200) (4.5) (170) 8 123 2.92 2.85 1 2.91 1.5 1.3 23.0 -150 min typ 44 458 100 -50 1 1.7 1.5 26.2 max 54 530 200 Unit mA mA A A A V V mA A A V V V mV pF C Note) Number in ( ) is a design reference value but not guaranteed one. s Package Power Dissipation PD -Ta 3200 2800 Evaluation PCB (80.0 x 80.0 x 1.2mm) Tjmax=150C PD=3100mW (25C) Power Dissipation PD (mW) 2400 2000 1600 1200 800 400 0 0 25 50 75 100 125 150 Ambient Temperature Ta (C) s Pin Name Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 REGOUT SGLINE14 SGLINE13 SGLINE12 SGLINE11 GND Note 1) SGLINE10 SGLINE9 SGLINE8 SGLINE7 SGLINE6 VCC (TERMPWR) Note 2) Pin name Pin No. 13 14 15 16 17 18 19 20 21 22 23 24 SGLINE5 SGLINE4 SGLINE3 SGLINE2 SGLINE1 GND Note 4) Pin name VCC (TERMPWR) Note 2) SGLINE18 SGLINE17 SGLINE16 SGLINE15 STANDBY Note 3) Note 1) On PCB, the same wide pattern as Pin6 GND terminal and Pin19GND terminal (One layer one surface GND of multi-layer board is recommended for PCB.) Note 2) VCC should be connected with SCSI termination resistive power supply TERMPWR. Note 3) STANDBY terminal input voltage : VI < VTH- for active mode and VI >VTH+ for stand-by mode Opening the STANDBY terminal also brings the stand-by mode. s Pin Descriptions Pin No. Pin name Equivalent circuit VCC 100k 24 24 STANDBY GND VCC 2, 3 4, 5 7, 8 9, 10 11, 14 15, 16 17, 18 20, 21 22, 23 SGLINE 1 REGOUT SGLINE 18 STANDBY GND -- 115 2 12 13 12, 13 VCC GND VCC 1 1 REGOUT STANDBY 20 k GND s Precautions on Input Capacitance The Interface Terminal Input Capacitance MAX25pF Standard are added from the SCSI II. This is because large stamp input capacitance may prevent the normal signal transmission. The capacitance value which does not cause the transmission error differs, depending on the connection conditions of SCSI equipment (such as distance between equipment, number of equipment units and cable impedance), so, its proper value for the AN8612NSR can not be identified. However, when the input capacitance value specified in SCSII Standard, MAX25pF is used, transmission error due to input capacitance can hardly occur. The input capacitance value is determined by the sum of the following capacitances : active terminator (ex. 4.5 pF), printed board (ex. 10 pF), driver receiver incorporated SCSI controller (ex. 10 pF) and connector (ex. 0.5 pF). [Evaluation Printed Board] Therefore, particular care should be taken to each device for input capacitance. For example, on the evaluation printed board of the AN8612NSR, the measured capacitance value per signal line is approx. 2.2 pF and that per unit area is 0.13 pF/mm 2. The thickness of printed board is 1 mm and the dielectric constant of glass epoxy is 3.8 to 5. For printed board, since the capacitance value differs, depending on the thickness between layers and wiring length, it should be measured actually. Also, it should be measured by using the capacitance meter which can measure the capacitance value of semiconductor. Front Back s Application Circuit SCSI equipment (PC interface board) SCSI equipment (MO) SCSI equipment (CD-ROM) SGLINE1 SGLINE18 SGLINE1 SGLINE18 SGLINE1 SGLINE18 AN8612NSR VCC STANBAY GND REGOUT VCC AN8612NSR REGOUT VCC AN8612NSR REGOUT STANBAY GND STANBAY GND |
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