HP7501 Ultra320 LVD/SE SCSI Terminator FEATURES DESCRIPTION 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. 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. 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. 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 1 36 TPWR NC 2 35 HVD NC 3 34 LVD R1P 4 33 SE R1N 5 32 R9N VREF 1 28 TPWR R2P 6 31 R9P R1P 2 27 TPWR R2N 7 30 R8N R1N 3 26 R9N HGND 8 29 R8P R2P 4 25 R9P HGND 9 28 HGND R2N 5 24 R8N HGND 10 27 HGND HGND 6 23 R8P R3P 11 26 HGND R3P 7 22 HGND R3N 12 25 R7N R3N 8 21 R7N R4P 13 24 R7P R4P 9 20 R7P R4N 14 23 R6N R4N 10 19 R6N R5P 15 22 R6P R5P 11 18 R6P R5N 16 21 DIF_CAP R5N 12 17 DIF_CAP ISO 17 20 DIFFSENSE ISO 13 16 DIFFSENSE GND 18 19 MST/SLV GND 14 15 MST/SLV HP7501-A36 2003/05/12 Ver. 0.0 HP7501-T28 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. 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. 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. 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. 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. 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. 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. 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. 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. A typical SCSI bus configuration is shown in Figure 2. 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. 2003/05/12 Ver. 0.0 NOTE: * DIFFSENS: Refers to the SCSI bus signal ** DIFFSENSE: Refers to the pin name in HP7501. 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 R9N 124 Ohm 2.85V MUX 52 Ohm 52 Ohm 124 Ohm R1P 52 Ohm 1.25V R9P SE GND DRIVER 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 1 2,3 8,9,10 26,27,28 4,6,11,13,15 22,24,29,31 VREF NC HGND 5,7,12,14,16 23,25,30,32 RxN 17 ISO 18 19 GND MST/SLV 20 DIFFSENSE 21 DIF_CAP 33 34 35 SE LVD HVD RxP DESCRIPTION 2.7V to 5.25V power input pin. Connect to SCSI bus power line. A 4.7µF capacitor and a 0.1µF 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. 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 1 6,22 VREF HGND 2,4,7,9,11 18,20,23,25 RxP 3,5,8,10,12 19,21,24,26 RxN 13 ISO 2003/05/12 Ver. 0.0 DESCRIPTION 2.7V to 5.25V power input pin. Connect to SCSI bus power line. A 4.7µF capacitor and a 0.1µF 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. 4 HIMARK TECHNOLOGY INC. HP7501 Ultra320 LVD/SE SCSI Terminator 14 GND 15 MST/SLV 16 DIFFSENSE 17 DIF_CAP 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. RECOMMENDED OPERATING CONDITIONS PARAMETER Termpower Voltage (SE) Termpower Voltage (LVD) SYMBOL Vtpwr MIN 4.0 2.7 TYP MAX 5.25 5.25 UNITS V V Logic 0 (Low) Logic 1 (High) Vil Vih -0.3 2.0 +0.8 Vtpwr+0.3 V V Operating Temperature Ta 0 70 ℃ MAX UNITS mA mA uA 1.0 uA NOTES 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 2003/05/12 Ver. 0.0 SYMBOL Itpwr Itpwr Iih MIN TYP 15 25 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 5 5 NOTES *1 HIMARK TECHNOLOGY INC. HP7501 Ultra320 LVD/SE SCSI Terminator SINGLE ENDED CHARACTERISTICS PARAMETER SE Termination Resistance SE Voltage Reference SE Output Current SYMBOL Rse MIN 104.5 TYP 110 Vref Ioc 2.70 SYMBOL Rdm MIN 100 TYP Rcm 110 Vdb Vcb MAX 115.5 UNITS NOTES Ω V mA *2 MAX 110 UNITS NOTES 125 150 Ω 100 112 125 mV 1.125 1.250 1.375 V MIN TYP 200 200 MAX 230 UNITS mA mA 3.00 25.4 LVD CHARACTERISTICS PARAMETER Differential Mode Termination Resistance Common Mode Termination Resistance Differential Mode Bias All lines open Common Mode Bias Ω REGULATOR CHARACTERISTICS PARAMETER Source Current Sink Current SYMBOL Isour Isink 100 NOTES *3 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 TERMPWR TPWR MST/SLV ISO TPWR MST/SLV ISO CONTROL HP7501 DIFFSENSE 4.7uF DIFFSENSE DIF_CAP VREF DIF_CAP 20k 0.1uF HP7501 20k 4.7uF 0.1uF TPWR MST/SLV ISO TPWR MST/SLV ISO DATA HP7501 VREF VREF DIF_CAP HP7501 DIF_CAP VREF 4.7uF 4.7uF TPWR MSTSLV ISO TPWR MST/SLV ISO DATA HP7501 VREF HP7501 DIF_CAP DIF_CAP 4.7uF VREF 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 E H The package of HP7501-A36 is SSOP-36 Q L D 0 .0 1 5 x4 5 0 C A A2 T (4 X) A1 e V iew A B SSOP-36 SYMBOL A A1 A2 B C D E e H L T Θ 2003/05/12 Ver. 0.0 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° 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° HIMARK TECHNOLOGY INC. HP7501 Ultra320 LVD/SE SCSI Terminator The package of HP7501-T28 is TSSOP-28 15 H E 28 θ L 1 4 b 1 Detail F L1 D See Detail F A1 e Seating Plane A A2 C 12°( 4X) D y TSSOP-28 DIMENSIONS IN MILIMETERS SYMBOLS A A1 A2 b C D H E MIN _____ NOM _____ 0.05 0.80 0.19 0.09 9.60 _____ _____ e 4.30 _____ L L1 y 0.45 _____ _____ θ 0° 1.00 _____ _____ 9.70 6.40 4.40 DIMENSIONS IN INCHES MAX 1.20 0.15 1.05 0.3 0 0.20 9.80 _____ MIN _____ NOM _____ 0.002 0.031 0.007 0.004 0.378 _____ _____ 0.039 _____ _____ 0.382 0.252 0.173 MAX 0.047 0.006 0.041 0.012 0.008 0.385 _____ 4.50 _____ 0.169 _____ 0. 026 0.60 1.00 _____ 0.75 _____ 0.024 0.039 _____ 0.030 _____ 0.076 0.018 _____ _____ _____ 8° 0° _____ 8° 0.65 0.177 _____ 0.003 HMARK reserves the right to make changes without further notice herein. 2003/05/12 Ver. 0.0 9 HIMARK TECHNOLOGY INC.