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HP7501 PDF даташит

Спецификация HP7501 изготовлена ​​​​«HiMARK» и имеет функцию, называемую «Ultra320 LVD/SE SCSI Terminator».

Детали детали

Номер произв HP7501
Описание Ultra320 LVD/SE SCSI Terminator
Производители HiMARK
логотип HiMARK логотип 

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HP7501 Даташит, Описание, Даташиты
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
compatibility to the SCSI-2, SCSI-1 and 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
HP7501 will connect in a SE termination.
HiMARK’s SCSI termination architecture uses high
speed elements for the design, therefore providing the
fast response time.
PACKAGE PINOUT
VREF
www.DataSheet4U.comNC
NC
R1P
R1N
R2P
R2N
HGND
HGND
HGND
R3P
R3N
R4P
R4N
R5P
R5N
ISO
GND
1 36
2 35
3 34
4 33
5 32
6 31
7 30
8 29
9 28
10 27
11 26
12 25
13 24
14 23
15 22
16 21
17 20
18 19
HP7501-A36
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 28
2 27
3 26
4 25
5 24
6 23
7 22
8 21
9 20
10 19
11 18
12 17
13 16
14 15
HP7501-T28
TPWR
TPWR
R9N
R9P
R8N
R8P
HGND
R7N
R7P
R6N
R6P
DIF_CAP
DIFFSENSE
MST/SLV
2003/05/12 Ver. 0.0
1 HIMARK TECHNOLOGY INC.









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HP7501 Даташит, Описание, Даташиты
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
www.DataSheet4oUp.ceoramted 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.









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HP7501 Даташит, Описание, Даташиты
BLOCK DIAGRAM
HP7501
Ultra320 LVD/SE SCSI Terminator
DIF_CAP
DIFFSENSE
ISO MSTR/SLV
THERMAL
SHUTDOWN
CIRCUITRY
DIFFSENSE
CIRCUITRY
CONTROL
LOGIG
BANDGAP
REFERENCE
www.DataSheet4U.com
2.85V
MUX
1.25V
R1se
R2se
52 Ohm
124 Ohm
52 Ohm
52 Ohm
124 Ohm
52 Ohm
SE
GND
DRIVER
R1N
R9N
R1P
R9P
SE
GND
DRIVER
VREF
Figure 1. Block Diagram of HP7501
2003/05/12 Ver. 0.0
3 HIMARK TECHNOLOGY INC.










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HP7501Ultra320 LVD/SE SCSI TerminatorHiMARK
HiMARK

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