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SS7519 Datasheet Preview

SS7519 Datasheet

Multi-mode SCSI Terminator

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FEATURES
!" Meets SCSI-1, SCSI-2, Ultra3 and
Ultra320 Standards.
!" Auto-selectable Multimode single-ended
or Low Voltage Differential termination.
!" Current limit and thermal shutdown
protection.
!" Ground driver integrated for
single-ended operation
!" Compatible with active-negation drivers.
SS7519
Multi-mode SCSI Terminator
Single-Ended resistor will maintain 110Ω ± 5%.
For LVD termination, the SS7519
integrates two current sources with nine
accuracy resistor strings. This architecture yields
a 105Ω ±5% differential and 226Ω ±10%
common mode impedance. A fail-safe bias of
110mV is sustained when no drivers are
connected to the SCSI bus. If the SS7519
detects a HVD SCSI device on the bus, all the
signals will be set to a high impedance state.
DESCRIPTION
The SS7519 multimode SCSI terminator is
both a single-ended and a low voltage
differential terminator that meets the
specifications of SCSI Parallel Interface (SPI-4).
The SS7519 also provides backward
VRFF
compatibility to the SCSI-1, SCSI-2 and
Single-Ended specifications. The Multimode
terminator contains all the functions required to
terminate and auto detect for SCSI devices
without hardware fluctuation. Auto-Selectable is
achieved by using voltage detection on the
DIFFSENSE signal. The SS7519 senses the
DIFFSENSE line while sourcing the
DIFFSENSE signal with LVD levels. The
DIFFSENSE line being grounded indicates that
www.DataSheet.net/
RIP
RIN
R2P
R2N
HS GND
R3P
R3N
R4P
R4N
R5P
R5N
ISO
GND
one or more SE devices are attached on the bus.
The SS7519 switches to the termination mode
that is appropriate for the bus based on the value
of the DIFFSENSE input voltage.
For the Single-Ended termination, the active
terminator will pull RXN to 2.85V and RXP to a
hard ground. The SS7519 can sink 22mA
per line as required by the SCSI specification. The
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
SS7519 - TSSOP28
Rev.2.01 6/06/2003
www.SiliconStandard.com
TPWR
TPWR
R9N
R9P
R8N
R8P
HS GND
R7N
R7P
R6N
R6P
DIFF_CAP
DIFFSENSE
M/S
1 of 5
Datasheet pdf - http://www.DataSheet4U.co.kr/




Silicon Standard

SS7519 Datasheet Preview

SS7519 Datasheet

Multi-mode SCSI Terminator

No Preview Available !

SS7519
PIN DESCRIPTION
PIN
27,28
SYMBOL
TPWR
1 VREF
6,22
14
2,4,7,9,11,18
20,23,25
HS GND
GND
RxP
3,5,8,10,12 RxN
19,21,24,26
13 ISO
15 M/S
16 DIFFSENSE
17 DIF_CAP
DESCRIPTION
4.0V to 5.75V 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 4.7µF capacitor to
ground as shown in Figure 1.
Heat Sink Ground. These should be connected to large area PC board
ground trace in order to increase the power dissipation capability.
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.
Isolate pin. This pin used to shut down the terminator if the terminator
is not connected at the end of the bus. Connecting 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 SS7519 will operate as normal if the ISO pin is left
floating.
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.
Mode Sense pin. 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 SS7519 will try to deliver LVD
level to the DIFFSENSE line.www.DataSheet.net/ 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 cause the SS7519 to configure into SE
operation. The SS7519 will go into shutdown mode if DIFFSENSE
detects a high voltage level.
DIFFSENSE CAPACITOR. This pin should be connected to a 0.1uF
capacitor to ground and 20KΩ resistor to SCSI bus DIFFSENSE line
for DIFFSEN filter.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Tpwr Voltage
Operating Temperature
Lead Temperature
(Soldering 10 seconds)
SYMBOL
Vterm
Top
Tsod
MIN
4.0
0
TYP.
300
MAX
5.75
70
UNITS
V
Rev.2.01 6/06/2003
www.SiliconStandard.com
2 of 5
Datasheet pdf - http://www.DataSheet4U.co.kr/


Part Number SS7519
Description Multi-mode SCSI Terminator
Maker Silicon Standard
Total Page 5 Pages
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