SS7500 Multi-mode SCSI Terminator FEATURES PACKAGE PIN OUT !" Fully compliant with Ultra160/m SCSI, Ultra2 and Ultra3 standards. !" Auto-selection Multi-Mode SE or LVD termination for 9 signal line pairs. !" 5 V operation VREF 36 35 TPWR LVD !" Built in thermal shutdown circuitry NC 1 2 !" Supports Master/Slave input. NC 3 34 R1P 4 33 SE R1N R2P 5 6 32 31 R9N R9P R2N 7 30 R8N HGND 29 28 27 HGND !" SCSI bus hot-plug compatible. !" Supports active-negation drive. HVD R8P HGND 8 9 10 The SS7500 is a multimode SCSI R3P 11 26 HGND terminator that conforms to the SCSI (SP2) R3N R4P 12 25 R7N 24 23 R7P DESCRIPTION HGND HGND R4N voltage differential (LVD) termination. 13 14 R5P 15 22 R6P The SS7500 provides backward compatibility R5N 16 21 DIF_CAP ISO 17 18 20 19 DIFFSEN specification which is designed for low to the SCSI and SCSI-2 specifications. Multimode function sets up the use of legacy GND devices on the bus without changing any R6N MST/SLV SS7500 hardware setting. Automatic selection is made by voltage detection on the diffsense line. If the device is connected to an LVD-only bus, the SS7500 will use LVD termination. If the device is connected in a Single Ended mode, the SS7500 will be connected in a SE termination. The SCSI termination architecture uses high speed elements for the design, therefore providing fast response time. Rev.2.01 6/06/2003 www.SiliconStandard.com 1 of 5 SS7500 PIN DESCRIPTION Rev.2.01 6/06/2003 PIN 36 1 SYMBOL TPWR VREF 2,3 8,9,10 26,27,28 4,6,11 13,15,22 24,29,31 5,7,12 14,16,23 25,30,32 17 18 19 NC HGND 20 DIFFSEN 21 DIF_CAP 33 SE 34 LVD 35 HVD RxP DESCRIPTION Vin 5V supply. Connect to SCSI bus power line. Reference Voltage. Must be decoupled with a 4.7uF as shown in Figure 1. Do not connect any signal to this pin. Heat Sink Ground. Connect to large area PC board ground trace in order to increase power dissipation. Signal Terminator. Line for single ended or positive line for differential mode. RxN Single Terminator. Line for single ended or negative line for differential mode. ISO GND MST/SLV Shuts down the terminator when pull high. Signal Ground. Mode select pin. Master mode will enable the DIFFSEN drive SCSI bus if this signal ties high. This signal will drive 1.3V to the SCSI bus during the Master mode in order to detect which type of device is connected to the SCSI bus. This pin should be connected to a 0.1uF capacitor to ground and 20K resistor to SCSI bus DIFFSEN line for DIFFSEN filter. Single ended. Indicates SE device is on the SCSI bus when this pin is active. Low Voltage Differential. Indicates the terminator is in LVD operation. High Voltage Differential. Indicates the HVD device is detected and terminator is in shut down mode. www.SiliconStandard.com 2 of 5 SS7500 DC CHARACTERISTICS: PARAMETER TPWR Current Input Leakage Current High Input Leakage Current Low Output Current High Vout = 2.4 V Output Current Low Vout = 0.4V DIFFSEN Output Voltage DIFFSEN Source Current DIFFSEN Sink Current DIFFSEN SE Voltage Range DIFFSEN LVD Voltage Range DIFFSEN HVD Voltage Range Operating Temperature SYMBOL Itpwr Iih MIN TYP 35 MAX UNITS mA uA 1.0 uA 0 Iil Ioh 0 mA Iol 4.0 mA Vov Isc Isi Vse 1.2 20 -0.3 1.4 15 200 0.5 V mA uA V Vlvd 0.7 1.9 V Vhvd 2.4 Vtpwr+0.3 V Ta 0 70 ℃ 5 Single Ended Characteristics PARAMETER SE Termination Resistance SE Voltage Reference SE Output Current SYMBOL Rse Vref Ioc MIN 104.5 2.70 TYP 110 MAX 115.5 3.00 25.4 UNITS Ω V mA SYMBOL Rd MIN 100 TYP MAX 110 UNITS Ω Rc 110 226 300 Ω Vdb 100 125 mV Vcb 1.125 1.375 V LVD Characteristics PARAMETER Differential Mode Termination Resistance Common Mode Termination Resistance Differential Mode Bias All lines open Common Mode Bias REGULATOR Characteristics PARAMETER Source Current SYMBOL Isour MIN TYP 200 Sink Current Isink 100 200 (0℃ ℃ to 70℃ ℃) MAX UNITS 230 mA Vout=0.2v mA NOTE: Unless otherwise specified, these specifications apply over the operating ambient temperature range from 0℃ ℃ to 70℃ ℃. Rev.2.01 6/06/2003 www.SiliconStandard.com 3 of 5 SS7500 TPWR Application Schematic TPWR MST/ SLV ISO SS7500 CONTROL DIFFSEN SS7500 SS7500 DIF_CAP VREF 20k TPWR MST/ SLV ISO TPWR DIFFSEN VREF DIF_CAP 4.7uF 0.1uF TPWR MST/ SLV ISO 20k DATA VREF DIF_CAP 0.1uF 4.7uF TPWR MST/ SLV ISO SS7500 DIF_CAP VREF 4.7uF 4.7uF TPWR MST/ SLV ISO TPWR MST/ SLV ISO DATA SS7500 SS7500 VREF VREF 4.7uF Rev.2.01 6/06/2003 DIF_CAP DIF_CAP Figure 1. www.SiliconStandard.com 4.7uF 4 of 5 SS7500 Package Dimension E H SSOP-36 Θ L D 0.015x450 C A A2 T(4X) A1 e View A B SYMBOL A A1 A2 B C D E e H L T Θ MILLIMETERS MIN MAX 2.41 2.59 0.20 0.40 2.26 2.52 0.30 0.45 0.127 0.254 15.75 16.00 7.391 7.595 0.8BSC 10.033 10.668 0.508 1.016 ---0.10 0° 8° INCHES MIN MAX 0.095 0.110 0.008 0.016 0.089 0.099 0.012 0.018 0.005 0.010 0.620 0.630 0.291 0.299 0.032BSC 0.395 0.420 0.020 0.040 ---0.004 0° 8° Information furnished by Silicon Standard Corporation is believed to be accurate and reliable. However, Silicon Standard Corporation makes no guarantee or warranty, express or implied, as to the reliability, accuracy, timeliness or completeness of such information and assumes no responsibility for its use, or for infringement of any patent or other intellectual property rights of third parties that may result from its use. Silicon Standard reserves the right to make changes as it deems necessary to any products described herein for any reason, including without limitation enhancement in reliability, functionality or design. No license is granted, whether expressly or by implication, in relation to the use of any products described herein or to the use of any information provided herein, under any patent or other intellectual property rights of Silicon Standard Corporation or any third parties. Rev.2.01 6/06/2003 www.SiliconStandard.com 5 of 5