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SS7500 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.
VREF NC NC R1P R1N R2P R2N HGND HGND HGND R3P R3N R4P R4N R5P R5N ISO GND
PACKAGE PIN OUT
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19
TPWR HVD LVD SE R9N R9P R8N R8P HGND HGND HGND R7N R7P R6N R6P DIF_CAP DIFFSEN MST/SLV
DESCRIPTION
The SS7500 is a multimode SCSI terminator that conforms to the SCSI (SP2) specification which is designed for low voltage differential (LVD) termination. 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 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.
SS7500
Rev.2.01 6/06/2003
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SS7500
PIN DESCRIPTION
PIN 36 1 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 20 21 33 34 35 SYMBOL TPWR VREF NC HGND RxP RxN ISO GND MST/SLV DIFFSEN DIF_CAP SE LVD HVD 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. Single Terminator. Line for single ended or negative line for differential mode. 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.
Rev.2.01 6/06/2003
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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 Iil Ioh Iol Vov Isc Isi Vse Vlvd Vhvd Ta 0 4.0 1.2 5 20 -0.3 0.7 2.4 0 1.4 15 200 0.5 1.9 MIN 0 1.0 TYP 35 MAX UNITS mA uA uA mA mA V mA uA V V
Vtpwr+0.3 V 70
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 V mA
LVD Characteristics
PARAMETER Differential Mode Termination Resistance Common Mode Termination Resistance Differential Mode Bias All lines open Common Mode Bias SYMBOL Rd Rc Vdb Vcb MIN 100 110 100 1.125 TYP 226 MAX 110 300 125 1.375 UNITS mV V
REGULATOR Characteristics
PARAMETER Source Current Sink Current SYMBOL Isour Isink MIN 100 TYP 200 200
(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
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SS7500
TPWR
Application Schematic
TPWR MST/ SLV ISO TPWR MST/ SLV ISO
TPWR
SS7500
DIFFSEN VREF DIF_CAP
CONTROL
SS7500
DIFFSEN DIF_CAP VREF
4.7uF 0.1uF TPWR MST/ SLV ISO
20k
20k
0.1uF 4.7uF TPWR MST/ SLV ISO
SS7500
DATA
SS7500
VREF DIF_CAP
DIF_CAP VREF
4.7uF TPWR MST/ SLV ISO
4.7uF TPWR MST/ SLV ISO
DATA
SS7500
VREF
SS7500
VREF
4.7uF
DIF_CAP
DIF_CAP
Figure 1.
4.7uF
Rev.2.01 6/06/2003
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SS7500
Package Dimension
SSOP-36
H
E
L
D T(4X)
0.015x450
A2
A
A1
e
View A B
SYMBOL A A1 A2 B C D E e H L T
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
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C
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