SS7500 SSC | Alldatasheet

Document overview

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Technical content

www.SiliconStandard.com 1 of 5 Multi-mode SCSI Terminator

FEATURES

!" 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 !" Built in thermal shutdown circuitry !" Supports Master/Slave input. !" SCSI bus hot-plug compatible. !" Supports active-negation drive.

DESCRIPTION

The SS7500 is a multimode SCSI terminator that conforms to the SCSI (SP2) specification which i s de signed for low voltage dif ferential (LVD) te rmination. The SS7500 provides backward compatibility to the SCSI and SCSI-2 specifications. Multimode function sets up the use of legacy devices on the bus without changing any hardware setting. Automatic selection is made by voltage detection on the diffsense line. If the de vice is co nnected 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. PACKAGE PIN OUT VREF NC R1P NC R1N R2P HGND R2N HGND HGND R3N R3P R4P R4N R5N R5P ISO GND SS7500 TPWR HVD SE LVD R9N R9P R8P R8N HGND HGND R7N HGND R7P R6N DIF_CAP R6P DIFFSEN MST/SLV SS7500 Rev.2.01 6/06/2003

www.SiliconStandard.com 2 of 5 SS7500 PIN DESCRIPTION P I N S Y M B O L D E S C R I P T I O N 3 6 TPWR Vin 5V supply. Connect to SCSI bus power line. 1 VREF Reference Voltage. Must be decoupled with a 4.7uF as shown in Figure 1. 2,3 NC Do not connect any signal to this pin. 8,9,10 26,27,28 HGND Heat Sink Ground. Connect to large area PC board ground trace in order to increase power dissipation. 4,6,11 13,15,22 24,29,31 RxP Signal Terminator. Line for single ended or positive line for differential mode. 5,7,12 14,16,23 25,30,32 RxN Single Terminator. Line for single ended or negative line for differential mode. 1 7 ISO Shuts down the terminator when pull high. 1 8 GND Signal Ground. 1 9 MST/SLV Mode select pin. Master mode will enable the DIFFSEN drive SCSI bus if this signal ties high. 2 0 DIFFSEN 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. 2 1 DIF_CAP This pin should be connected to a 0.1uF capacitor to ground and 20K resistor to SCSI bus DIFFSEN line for DIFFSEN filter. 3 3 SE Single ended. Indicates SE device is on the SCSI bus when this pin is active. 3 4 LVD Low Voltage Differential. Indicates the terminator is in LVD operation. 3 5 HVD High Voltage Differential. Indicates the HVD device is detected and terminator is in shut down mode. Rev.2.01 6/06/2003

www.SiliconStandard.com 3 of 5 SS7500 DC CHARACTERISTICS: PARAMETER SYMBOL MIN TYP MAX UNITS TPWR Current Itpwr 35 mA Input Leakage Current High Iih 0 uA Input Leakage Current Low Iil 1.0 uA Output Current High V out = 2.4 V Ioh 0 mA Output Current Low V out = 0.4V Iol 4.0 mA DIFFSEN Output V oltage V ov 1.2 1.4 V DIFFSEN Source Current Isc 5 15 mA DIFFSEN Sink Current Isi 20 200 uA DIFFSEN SE V oltage Range Vse -0.3 0.5 V DIFFSEN LVD V oltage Range Vlvd 0.7 1.9 V DIFFSEN HVD V oltage Range Vhvd 2.4 Vtpwr+0.3 V Operating Temperature Ta 0 70 ℃ Single Ended Characteristics PARAMETER SYMBOL MIN TYP MAX UNITS SE Termination Resistance Rse 104.5 110 115.5 Ω SE V oltage Reference Vref 2.70 3.00 V SE Output Current Ioc 25.4 mA LVD Characteristics PARAMETER SYMBOL MIN TYP MAX UNITS Differential Mode Termination Resistance Rd 100 110 Ω Common Mode Termination Resistance Rc 110 226 300 Ω Differential Mode Bias All lines open Vdb 100 125 mV Common Mode Bias Vcb 1.125 1.375 V R E G U L A T O R C h a r a c t e r i s t i c s (0℃℃ ℃℃ to 70 ℃℃ ℃℃) PARAMETER SYMBOL MIN TYP MAX UNITS Source Current Isour 200 230 V out=0.2v mA Sink Current Isink 100 200 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 4 of 5 SS7500 TPWR MST/ SLV ISO TPWR MST/ SLV ISO TPWR MST/ SLV ISO TPWR MST/ SLV ISO TPWR MST/ SLV ISO TPWR MST/ SLV ISO VREF DIF_CAP VREF DIF_CAP DIF_CAP VREF DIFFSENDIFFSEN 20k 20k Figure 1. 0.1uF4.7uF 0.1uF TPWR 4.7uF 4.7uF 4.7uF 4.7uF4.7uF TPWR DATA DATA CONTROL Application Schematic SS7500 VREF VREF VREF DIF_CAP DIF_CAP DIF_CAP SS7500 SS7500 SS7500SS7500 SS7500 Rev.2.01 6/06/2003

www.SiliconStandard.com 5 of 5 SS7500 Package Dimension SSOP-36 D T(4X) A B e 0.015x450 C L Θ H E View A MILLIMETERS INCHES SYMBOL MIN MAX MIN MAX A 2.41 2.59 0.095 0.110 A1 0.20 0.40 0.008 0.016 A2 2.26 2.52 0.089 0.099 B 0.30 0.45 0.012 0.018 C 0.127 0.254 0.005 0.010 D 15.75 16.00 0.620 0.630 E 7.391 7.595 0.291 0.299 e 0.8BSC 0.032BSC H 10.033 10.668 0.395 0.420 L 0.508 1.016 0.020 0.040 Θ 0° 8 ° 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 infr ingement 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