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| HP7501 Ultra320 LVD/SE SCSI Terminator FEATURES Fully compliant with Ultra320 (SPI-4), Ultra3/Ultra160 (SPI-3), Ultra2/Fast-40 (SPI-2) and Ultra/Fast-20 Standards. Auto Selection Multi-Mode SE or LVD Termination for 9 signal line pairs. Built-in SPI-4 Mode Change Filter 2.7V to 5.25V Operation Built in Current Limit and Thermal shutdown Protection Circuitry. Support Master/Slave input. SCSI bus hot plug compatible. Support active negation drive. 28 and 36 pin package. DESCRIPTION The HP7501 is a multi-mode SCSI terminator that conforms to the SCSI (SPI-4) specification which is designed for the low voltage differential (LVD) termination. The HP7501 provides backward c o m pa t i b i l i t y t o t h e S CS I -2 , S CS I - 1 a n d a Single-Ended specifications. Multi-mode function set up the use of legacy devices on the bus without changing any hardware setting. Automatic selection is made by voltage detection on the DIFFSEN line. If the device is connected in an LVD only bus, the HP7501 will use LVD termination. If the device is connected in a Single Ended mode, the H P 7 5 0 1 wi l l c o n n e c t i n a S E t e rm i n a t i o n . HiMARK's SCSI termination architecture uses high speed elements for the design, therefore providing the fast response time. PACKAGE PINOUT VREF NC NC R1P R1N R2P R2N HGND HGND HGND R3P R3N R4P R4N R5P R5N ISO GND 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 DIFFSENSE MST/SLV VREF R1P R1N R2P R2N HGND R3P R3N R4P R4N R5P R5N ISO GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 TPWR TPWR R9N R9P R8N R8P HGND R7N R7P R6N R6P DIF_CAP DIFFSENSE MST/SLV 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 HP7501-A36 HP7501-T28 2003/05/12 Ver. 0.0 1 HIMARK TECHNOLOGY INC. HP7501 Ultra320 LVD/SE SCSI Terminator ORDERING INFOMATION PART NUMBER HP7501-A36 HP7501-T28 PIN - PACKAGE SSOP-36 pin TSSOP-28 pin FUNCTIONAL DESCRIPTION HP 7501 is a multi-mode active terminator with automatically switching on LVD/SE/HVD mode. The DIFFSENS* is on one of three voltage levels to indicate LVD/SE/HVD mode. If the voltage on DIFFSESE** is above 2.16V, below 0.6V or between, that indicates the bus mode to be HVD, SE, or LVD. In Figure 1, a bandgap reference is fed into an buffer to generate reference voltages. A voltage selected by the control logic through a MUX is used to generate 2.85V or 1.25V reference voltages. A voltage 2.85V and 1.25V is used in SE mode and LVD mode respectively. The voltage for a specific mode is sent out through an op buffer. In SE mode, the RxP pin is switched to ground. DIFF_CAP with a RC low pass filter monitors the voltage on DIFFSENS to determine the termination mode used on bus. The DIFFERENSE CIRCUITRY decodes the trinary voltage on DIFF_CAP and generates three control logic signals internally. The control logic will change the total termination resistance and switch to one of three termination modes based on the voltage on DIFFSENS. SE Mode: The voltage on DIFFSENSE is between 0V - 0.5V. RxP pin is grounded. When the external driver for a given line turns off, the active terminator will pull that signal line to 2.85V (quiescent state). When operated in an active negation driver, the power amp can sink 22mA per line and the reference voltage won't change over 100mV. The termination resistors maintain 110ohm. HVD Mode: The voltage on DIFFSENSE is above 2.4V. HP7501 will identify that there is an HVD (high voltage differential) device on the SCSI bus and isolate the termination pins from the bus. LVD Mode: The voltage on DIFFSENSE is between 0.7-1.9V. A precious resistor string between two current sources provides LVD termination. It offers a 105 ohm differential mode impedance and a 125 ohm common mode impedance. A fail-safe bias of 112mV is maintained when no driver is connected to the SCSI bus. During high temperature (>150 ), HP7501 would thermal shutdown. The termination pins are isolated from SCSI bus and Vref becomes high impedance. When ISO=1, the termination pins are isolated from the SCSI bus, but the bus mode indicators (SE/LVD/HVD) and Vref remain active. In the above two cases, the DIFFSENSE driver is shut down and in high impedance. The TPWR pin is connected to the SCSI bus TERMPWR line to power up the HP7501. The TERMPWR line should be bypassed locally. A 2.2uF capacitor and a 0.01uF high frequency capacitor between TPWR and ground are suggested for different frequency noise. Capacitors should be placed as close as possible to the HP7501. The HP7501 should be placed as close as possible to the SCSI connector to minimize input signal trace length and result in less reflections and better performance. To maintain the specified voltage, a 4.7uF capacitor is recommended between the Vref (pin36) and ground. A high frequency capacitor (0.1uF ceramic recommended) can also be placed on the Vref pin in applications the use fast rise/fall time drivers. It is also recommended to place a RC low pass filter between DIFFSENSE and DIF_CAP to lower noise from the SCSI bus. DIFFSENS Noise Filtering: The HP7501 incorporates a digital filter to remove high frequency transients on the DIFFSENS control line. The external filter may be used as well in addition to the internal digital filter. A typical SCSI bus configuration is shown in Figure 2. NOTE: * DIFFSENS: Refers to the SCSI bus signal ** DIFFSENSE: Refers to the pin name in HP7501. 2003/05/12 Ver. 0.0 2 HIMARK TECHNOLOGY INC. HP7501 Ultra320 LVD/SE SCSI Terminator BLOCK DIAGRAM DIF_CAP DIFFSENSE ISO MSTR/SLV DIFFSENSE CIRCUITRY THERMAL SHUTDOWN CIRCUITRY CONTROL LOGIG R1se R2se BANDGAP REFERENCE R1N 52 Ohm 2.85V MUX 124 Ohm 52 Ohm 52 Ohm 124 Ohm R9N R1P 52 Ohm 1.25V SE GND DRIVER R9P SE GND DRIVER VREF Figure 1. Block Diagram of HP7501 2003/05/12 Ver. 0.0 3 HIMARK TECHNOLOGY INC. HP7501 Ultra320 LVD/SE SCSI Terminator PIN DESCRIPTION ( for 36pin SSOP) PIN 36 SYMBOL TPWR DESCRIPTION 2.7V to 5.25V power input pin. Connect to SCSI bus power line. A 4.7F capacitor and a 0.1F high frequency capacitor are recommended between TPWR and ground 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. 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 VREF NC HGND RxP RxN ISO 18 19 20 GND MST/SLV DIFFSENSE 21 33 34 35 DIF_CAP SE LVD HVD Termination lines. These lines switch to hard ground in SE mode and are the positive lines for LVD mode. All lines are in high impedance when HVD is detected. Termination lines. These lines switch to the active lines in SE mode and are the negative lines for LVD mode. All lines are in high impedance when HVD is detected. Isolation pin. This pin is used to shut down the terminator if the terminator is not connected at the end of the bus. Connect the pin to ground will activate the terminator in normal operation. The terminator will be disabled when the pin is in high state. An internal pull-down resistor assures that the HP7501 will operate as normal if the ISO pin is left floating. Signal Ground. Mode select pin. When pull high, master mode will enable the DIFFSEN drive SCSI bus. The DIFFSENSE driver is off when this pin is connected to ground. 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. On power up, the HP7501 will try to deliver LVD level to the DIFFSENSE line. If only LVD SCSI devices are on the bus, the DIFFSENSE signal will be successfully driven to 1.3V and the terminator will configure the system for LVD operation. If any SE device is on the bus, it will present a grounding level to the DIFFSENSE line. This will indicate HP7501 to configure into SE operation. HP7501 will be in shut down mode if DIFFSENSE detects a high voltage level. This pin should be connected to a 0.1uF capacitor to ground and 20K resistor to SCSI bus DIFFSENS 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. PIN DESCRIPTION ( for 28pin TSSOP) PIN 27,28 SYMBOL TPWR DESCRIPTION 2.7V to 5.25V power input pin. Connect to SCSI bus power line. A 4.7F capacitor and a 0.1F high frequency capacitor are recommended between TPWR and ground. Reference Voltage. Must be decoupled with a 4.7uF as shown in Figure 1. Heat Sink Ground. Connect to large area PC board ground trace in order to increase power dissipation. Termination lines. These lines switch to hard ground in SE mode and are the positive lines for LVD mode. All lines are in high impedance when HVD is detected. Termination lines. These lines switch to the active lines in SE mode and are the negative lines for LVD mode. All lines are in high impedance when HVD is detected. Isolation pin. This pin is used to shut down the terminator if the terminator is not connected at the end of the bus. Connect the pin to ground will activate the terminator in normal operation. The terminator will be disabled when the pin is in high state. An internal pull-down resistor assures that the HP7501 will operate as normal if the ISO pin is left floating. 1 6,22 2,4,7,9,11 18,20,23,25 3,5,8,10,12 19,21,24,26 13 VREF HGND RxP RxN ISO 2003/05/12 Ver. 0.0 4 HIMARK TECHNOLOGY INC. HP7501 Ultra320 LVD/SE SCSI Terminator 14 15 16 GND MST/SLV DIFFSENSE Signal Ground. Mode select pin. When pull high, master mode will enable the DIFFSEN drive SCSI bus. The DIFFSENSE driver is off when this pin is connected to ground. 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. On power up, the HP7501 will try to deliver LVD level to the DIFFSENSE line. If only LVD SCSI devices are on the bus, the DIFFSENSE signal will be successfully driven to 1.3V and the terminator will configure the system for LVD operation. If any SE device is on the bus, it will present a grounding level to the DIFFSENSE line. This will indicate HP7501 to configure into SE operation. HP7501 will be in shut down mode if DIFFSENSE detects a high voltage level. This pin should be connected to a 0.1uF capacitor to ground and 20K resistor to SCSI bus DIFFSENS line for DIFFSEN filter. 17 DIF_CAP RECOMMENDED OPERATING CONDITIONS PARAMETER Termpower Voltage (SE) Termpower Voltage (LVD) SYMBOL Vtpwr Vil Vih Ta MIN 4.0 2.7 TYP MAX 5.25 5.25 UNITS V V NOTES Logic 0 (Low) Logic 1 (High) Operating Temperature -0.3 2.0 0 +0.8 Vtpwr+0.3 70 V V DC CHARACTERISTICS PARAMETER TPWR Current (SE) TPWR Current (LVD) 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 SYMBOL Itpwr Itpwr Iih MIN TYP 15 25 MAX UNITS mA mA uA NOTES *1 0 1.0 0 4.0 1.2 5 20 -0.3 0.7 2.4 1.4 15 200 0.5 1.9 Vtpwr+0.3 Iil Ioh Iol Vov Isc Isi Vse Vlvd Vhvd uA mA mA V mA uA V V V 2003/05/12 Ver. 0.0 5 HIMARK TECHNOLOGY INC. HP7501 Ultra320 LVD/SE SCSI Terminator SINGLE ENDED CHARACTERISTICS PARAMETER SE Termination Resistance SYMBOL Rse MIN 104.5 TYP 110 MAX 115.5 UNITS V mA NOTES SE Voltage Reference SE Output Current Vref Ioc 2.70 3.00 25.4 *2 LVD CHARACTERISTICS PARAMETER Differential Mode Termination Resistance Common Mode Termination Resistance Differential Mode Bias All lines open Common Mode Bias SYMBOL Rdm MIN 100 TYP MAX 110 UNITS NOTES Rcm Vdb Vcb 110 100 1.125 125 112 1.250 150 125 1.375 mV V REGULATOR CHARACTERISTICS PARAMETER Source Current Sink Current SYMBOL Isour Isink MIN TYP 200 200 MAX 230 UNITS mA mA NOTES *3 100 NOTE: Unless otherwise specified, these specifications apply over the operating ambient temperature range from 0 to 70. *1. All lines open. *2. Vline = 0.2V *3. Vref = 0.2V 2003/05/12 Ver. 0.0 6 HIMARK TECHNOLOGY INC. HP7501 Ultra320 LVD/SE SCSI Terminator TYPICAL OPERATING CIRCUIT TERMPWR TPWR MST/SLV ISO TPWR MST/SLV ISO CONTROL TERMPWR HP7501 DIFFSENSE VREF DIF_CAP HP7501 DIFFSENSE DIF_CAP VREF 4.7uF 0.1uF 20k 20k 0.1uF 4.7uF TPWR MST/SLV ISO TPWR MST/SLV ISO DATA HP7501 HP7501 VREF DIF_CAP DIF_CAP VREF 4.7uF 4.7uF TPWR MSTSLV ISO DATA TPWR MST/SLV ISO HP7501 HP7501 VREF DIF_CAP DIF_CAP VREF 4.7uF 4.7uF Figure 2. SCSI BUS Configuration 2003/05/12 Ver. 0.0 7 HIMARK TECHNOLOGY INC. HP7501 Ultra320 LVD/SE SCSI Terminator PACKAGE DIMENSION The package of HP7501-A36 is SSOP-36 H E Q L D T (4 X) A2 A 0 .0 1 5 x4 5 0 A1 e V iew A B SSOP-36 SYMBOL A A1 A2 B C D E e H L T DIMENSIONS IN 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 DIMENSIONS IN 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 2003/05/12 Ver. 0.0 8 HIMARK TECHNOLOGY INC. C HP7501 Ultra320 LVD/SE SCSI Terminator The package of HP7501-T28 is TSSOP-28 28 15 E H 1 b 1 4 L L1 Detail F 12( 4X) D A2 A e Seating Plane Dy TSSOP-28 SYMBOLS A A1 A2 b C D H E e L L1 y MIN _____ 0.05 0.80 0.19 0.09 9.60 _____ 4.30 _____ 0.45 _____ _____ 0 DIMENSIONS IN MILIMETERS NOM _____ _____ 1.00 _____ _____ 9.70 6.40 4.40 0.65 0.60 1.00 _____ _____ MAX 1.20 0.15 1.05 0.3 0 0.20 9.80 _____ 4.50 _____ 0.75 _____ 0.076 8 MIN _____ 0.002 0.031 0.007 0.004 0.378 _____ 0.169 _____ 0.018 _____ _____ 0 DIMENSIONS IN INCHES NOM _____ _____ 0.039 _____ _____ 0.382 0.252 0.173 0. 026 0.024 0.039 _____ _____ MAX 0.047 0.006 0.041 0.012 0.008 0.385 _____ 0.177 _____ 0.030 _____ 0.003 8 HMARK reserves the right to make changes without further notice herein. A1 See Detail F 2003/05/12 Ver. 0.0 9 HIMARK TECHNOLOGY INC. C |
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