SS7500 [SSC]
Multi-mode SCSI Terminator; 多模式SCSI终结者
| 型号： | SS7500 |
| 厂家： | 
SILICON STANDARD CORP. |
| 描述： | Multi-mode SCSI Terminator |
| 文件： | 总5页 (文件大小：562K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SS7500
Multi-mode SCSI Terminator
FEATURES
PACKAGE PIN OUT
!" 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
VREF
NC
NC
R1P
R1N
R2P
R2N
HGND
HGND
HGND
R3P
R3N
R4P
R4N
R5P
36
35
TPWR
HVD
LVD
SE
R9N
R9P
R8N
R8P
HGND
HGND
HGND
R7N
R7P
R6N
R6P
DIF_CAP
DIFFSEN
MST/SLV
1
2
!" Built in thermal shutdown circuitry
!" Supports Master/Slave input.
!" SCSI bus hot-plug compatible.
!" Supports active-negation drive.
34
33
32
31
3
4
5
6
30
29
28
27
7
8
9
DESCRIPTION
10
26
25
11
12
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.
24
23
13
14
22
21
20
19
15
16
17
18
R5N
ISO
GND
SS7500
Rev.2.01 6/06/2003
www.SiliconStandard.com
1 of 5
SS7500
PIN DESCRIPTION
PIN
36
1
SYMBOL
TPWR
DESCRIPTION
Vin 5V supply. Connect to SCSI bus power line.
Reference Voltage. Must be decoupled with a 4.7uF as shown in
Figure 1.
VREF
2,3
NC
Do not connect any signal to this pin.
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
HGND
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.
RxP
RxN
Single Terminator. Line for single ended or negative line for
differential mode.
ISO
Shuts down the terminator when pull high.
Signal Ground.
18
GND
19
MST/SLV
Mode select pin. Master mode will enable the DIFFSEN drive
SCSI bus if this signal ties high.
20
DIFFSEN
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.
21
33
34
35
DIF_CAP
SE
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.
LVD
Low Voltage Differential. Indicates the terminator is in LVD
operation.
HVD
High Voltage Differential. Indicates the HVD device is detected
and terminator is in shut down mode.
Rev.2.01 6/06/2003
www.SiliconStandard.com
2 of 5
SS7500
DC CHARACTERISTICS:
SYMBOL
MIN
0
TYP
35
MAX
1.0
UNITS
mA
PARAMETER
TPWR Current
Input Leakage Current
High
Itpwr
Iih
uA
Input Leakage Current
Low
Iil
uA
Output Current High
Vout = 2.4 V
Ioh
Iol
0
mA
mA
Output Current Low
Vout = 0.4V
4.0
1.2
DIFFSEN Output Voltage Vov
DIFFSEN Source Current Isc
1.4
15
200
0.5
V
5
mA
uA
V
DIFFSEN Sink Current
DIFFSEN SE Voltage
Range
Isi
Vse
20
-0.3
DIFFSEN LVD Voltage
Range
Vlvd
Vhvd
Ta
0.7
2.4
0
1.9
V
DIFFSEN HVD Voltage
Range
Vtpwr+0.3 V
Operating Temperature
70
℃
Single Ended Characteristics
PARAMETER
SYMBOL
MIN
104.5
2.70
TYP
110
MAX
115.5
3.00
UNITS
Ω
V
mA
SE Termination Resistance Rse
SE Voltage Reference
SE Output Current
Vref
Ioc
25.4
LVD Characteristics
PARAMETER
SYMBOL
Rd
MIN
100
TYP
226
MAX
110
UNITS
Differential Mode
Termination Resistance
Common Mode
Ω
Rc
110
300
Ω
Termination Resistance
Differential Mode Bias
All lines open
Vdb
Vcb
100
125
mV
V
Common Mode Bias
1.125
1.375
REGULATOR Characteristics
(0℃ to 70℃)
PARAMETER
Source Current
SYMBOL
Isour
MIN
100
TYP
MAX
UNITS
mA
200
230
Vout=0.2v
Sink Current
Isink
200
mA
NOTE: Unless otherwise specified, these specifications apply over the operating ambient
temperature range from 0℃ to 70℃.
Rev.2.01 6/06/2003
www.SiliconStandard.com
3 of 5
SS7500
Application
Schematic
TPWR
TPWR
TPWR
MST/
SLV
TPWR
MST/
SLV
ISO
ISO
CONTROL
SS7500
SS7500
DIFFSEN
VREF
DIFFSEN
DIF_CAP
DIF_CAP VREF
20k
20k
4.7uF
4.7uF
0.1uF
0.1uF
TPWR
TPWR
MST/
SLV
MST/
SLV
ISO
ISO
DATA
SS7500
SS7500
VREF DIF_CAP
4.7uF
DIF_CAP VREF
4.7uF
TPWR
MST/
SLV
TPWR
MST/
SLV
ISO
ISO
DATA
SS7500
VREF
SS7500
VREF
DIF_CAP
DIF_CAP
4.7uF
4.7uF
Figure 1.
Rev.2.01 6/06/2003
www.SiliconStandard.com
4 of 5
SS7500
Package Dimension
SSOP-36
Θ
L
D
0.015x450
T(4X)
e
View A
B
SYMBOL
MILLIMETERS
INCHES
MIN MAX
MIN
2.41
MAX
2.59
A
A1
A2
B
0.095
0.008
0.089
0.012
0.005
0.620
0.291
0.110
0.016
0.099
0.018
0.010
0.630
0.299
0.20
0.40
2.26
2.52
0.30
0.45
C
D
E
0.127
15.75
7.391
0.254
16.00
7.595
e
0.8BSC
0.032BSC
H
L
10.033
0.508
----
10.668
1.016
0.10
0.395
0.020
----
0.420
0.040
0.004
8°
T
0°
8°
0°
Θ
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
www.SiliconStandard.com
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