LX5115CDW-TR [MICROSEMI]

SCSI Terminator, 9-Line, BICMOS, PDSO16, ROHS COMPLIANT, PLASTIC, SO-16;
LX5115CDW-TR
型号: LX5115CDW-TR
厂家: Microsemi    Microsemi
描述:

SCSI Terminator, 9-Line, BICMOS, PDSO16, ROHS COMPLIANT, PLASTIC, SO-16

信息通信管理 光电二极管 接口集成电路
文件: 总4页 (文件大小:178K)
中文:  中文翻译
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Not Recommended For New Design  
UltraMAX  
LX5115  
®
ULTRA 9- CHANNEL SCSI TERMINATOR  
TM  
P
R O D U C T I O N D A T A S H E E T  
KEY FEATURES  
DESCRIPTION  
The LX5115 SCSI terminator is part of  
lengths and impedances. Frequently, this situation  
is not controlled by the peripheral or host designer  
and, when problems occur, they are the first to be  
made aware of the problem. The LX5115  
architecture is much more tolerant of marginal  
system integrations. Recognizing the needs of  
portable and configurable peripherals, the LX5115  
„
ULTRA-FAST RESPONSE  
FOR FAST-20 SCSI  
APPLICATIONS  
35MHz CHANNEL  
BANDWIDTH  
LESS THAN 3pF OUTPUT  
CAPACITANCE  
SLEEP-MODE CURRENT OF  
150µA  
NO EXTERNAL  
COMPENSATION  
Linfinity's UltraMAX family of high-performance,  
adaptive, non-linear mode SCSI products, which  
are designed to deliver true UltraSCSI performance  
in SCSI applications. The low voltage BiCMOS  
architecture employed in its design offers superior  
performance to older linear passive and active  
techniques.  
„
„
„
„
has  
a TTL compatible sleep/disable mode.  
Linfinity's UltraMAX architecture employs high-  
speed adaptive elements for each channel, thereby  
providing the fastest response possible — typically  
35MHz, which is 100 times faster than the older  
linear regulator/terminator approach used by other  
manufacturers. Products using this older linear  
regulator approach have bandwidths which are  
dominated by the output capacitor and which are  
limited to 500KHz (see further discussion in the  
Functional Description section).  
The UltraMAX architecture also eliminates the  
output compensation capacitor typical in earlier  
terminator designs. Each is approved for use with  
SCSI-1, -2, -3, UltraSCSI and beyond — providing  
the highest performance alternative available today.  
Another key improvement offered by the LX5115  
lies in its ability to insure reliable, error free  
communications even in systems which do not  
adhere to recommended SCSI hardware design  
guidelines, such as the use of improper cable  
Quiescent current is typically 150µA in this mode,  
while the output capacitance is also less than 3pF.  
The obvious advantage of extended battery life for  
portable systems is inherent in the product's sleep  
mode feature. Additionally, the disable function  
CAPACITORS  
„
„
IMPLEMENTS 8-BIT OR 16-BIT  
( WIDE) APPLICATIONS  
COMPATIBLE WITH ACTIVE  
NEGATION DRIVERS (37mA /  
CHANNEL)  
COMPATIBLE WITH PASSIVE  
AND ACTIVE TERMINATIONS  
APPROVED FOR USE WITH  
SCSI 1, 2, 3 AND ULTRA SCSI  
HOT SWAP COMPATIBLE  
PIN-FOR-PIN COMPATIBLE  
WITH DS21S07A / 2105  
permits  
factory-floor  
or  
production-line  
configurability, reducing inventory and product  
line diversity costs.  
Field configurability can also be accomplished  
without physically removing components which,  
often times results in field returns due to  
mishandling. Reduced component counts is also  
inherent in the LX5115 architecture. Traditional  
termination techniques require large stabilization  
and transient protection capacitors of up to 20µF  
in value and size. The LX5115 architecture does  
not require these components, allowing all the cost  
savings associated with inventory, board space,  
assembly, reliability, and component costs.  
„
„
„
„
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com  
PRODUCT HIGHLIGHT  
RECEIVIN G  
W
AVEFO RM - 2 0 MH  
Z
DRIVIN G W AVEFO RM - 2 0 MHZ  
Receiver  
Driver  
NOTE:  
For An In-Depth  
1 Meter, AWG 28  
Discussion On Applying  
SCSI, Request Linfinity  
Application Note:  
"Understanding The Single-  
Ended SCSI Bus"  
LX5115  
LX5115  
LX5268  
LX5268  
PACKAGE ORDER INFO  
Plastic SOIC  
16-Pin  
Plastic SOWB  
Plastic TSSOP  
20-Pin, Power  
D
DW  
PWP  
16-Pin  
TJ (°C)  
RoHS Compliant Pb-free  
Transition DC: 0440  
RoHS Compliant Pb-free  
Transition DC: 0516  
0 to 70  
LX5115CD  
LX5115CDW  
LX5115CPWP  
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX5115CD-TR)  
M
I C R O S E M I  
I
N C . –  
I
N T E G R A T E D P R O D U C T S D I V I S I O N  
Copyright © 1997  
Rev. 1.2b,2005-04-07  
1
11861 WESTERN  
A
VENUE, GARDEN  
G
ROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570  
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7  
LX5115  
UltraMAX  
U L T R A 9 - C H A N N E L S C S I T E R M I N A T O R  
P R O D U C T I O N D A T A S H E E T  
ABSOLUTE MAXIMUM RATINGS  
(Note 1)  
PACKAGE PIN OUTS  
Peak Package Solder Reflow Temp. (40 second max. exposure)................260°C (+0, -5)  
Continuous Termination Voltage ..........................................................................10V  
TERM POWER  
16  
15  
14  
13  
12  
11  
10  
9
DISABLE  
N.C.  
D8  
D7  
D6  
D5  
N.C.  
N.C.  
D0  
D1  
D2  
D3  
D4  
2
3
4
5
6
7
8
Continuous Output Voltage Range .............................................................. 0 to 5.5V  
Continuous Disable Voltage Range.............................................................. 0 to 5.5V  
Operating Junction Temperature ........................................................... 0°C to 125°C  
Storage Temperature Range ............................................................. -65°C to +150°C  
Solder Temperature (Soldering, 10 seconds) ................................................... 300°C  
N.C.  
GND  
Note 1. Exceeding these ratings could cause damage to the device.  
D PACKAGE  
(Top View)  
THERMAL DATA  
D & DW Package: RoHS / Pb-free 100% Matte Tin Lead Finish  
D PACKAGE:  
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
TERM POWER  
DISABLE  
N.C.  
N.C.  
D8  
D7  
D6  
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA  
DW PACKAGE:  
120°C/W  
95°C/W  
D0  
D1  
D2  
D3  
D4  
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA  
PWP PACKAGE:  
N.C.  
GND  
D5  
N.C.  
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA  
139°C/W  
Junction Temperature Calculation: TJ = TA + (P x θJA).  
The θJA numbers are guidelines for the thermal Dperformance of the device/pc-board system.  
DW PACKAGE  
(Top View)  
All of the above assume no ambient airflow.  
TERM POWER  
20  
DISABLE  
HEATSINK/GND  
2
3
4
5
6
7
8
19  
18  
17  
16  
15  
14  
13  
N.C.  
HEATSINK/GND  
N.C.  
D8  
D7  
D6  
D5  
D0  
D1  
D2  
D3  
D4  
HEATSINK/GND  
N.C.  
9
12  
11  
HEATSINK/GND  
N.C.  
10  
GND  
PWP PACKAGE  
(Top View)  
Copyright © 1997  
Rev. 1.2b  
2
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7  
LX5115  
UltraMAX  
U L T R A 9 - C H A N N E L S C S I T E R M I N A T O R  
P R O D U C T I O N D A T A S H E E T  
RECOMMENDED OPERATING CONDITIONS  
(Note 2)  
Recommended Operating Conditions  
Parameter  
Symbol  
Units  
Min.  
Typ.  
Max.  
Termination Voltage  
VTERM  
VIH  
4.0  
2
5.5  
VTERM  
0.8  
V
V
V
High Level Enable Input Voltage  
Low Level Disable Input Voltage  
Operating Virtual Junction Temperature Range  
LX5115C  
VIL  
0
0
125  
°C  
Note 2. Range over which the device is functional.  
ELECTRICAL CHARACTERISTICS  
Term Power = 4.75V unless otherwise specified. Unless otherwise specified, these specifications apply at the recommended operating ambient tempera-  
ture of TA = 25°C. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.  
LX5115  
Typ.  
Parameter  
Symbol  
Test Conditions  
Units  
Min.  
Max.  
Output High Voltage  
TermPwr Supply Current  
VOUT  
ICC  
2.65  
2.85  
5.5  
210  
150  
-23  
10  
-15  
20  
3
V
All data lines = open  
9
mA  
mA  
µA  
mA  
nA  
µA  
nA  
pF  
All data lines = 0.5V  
Disable Pin < 0.8V  
VOUT = 0.5V  
225  
Output Current  
IOUT  
-21  
-24  
Disable Input Current  
I
Disable Pin = 4.75V  
Disable Pin = 0V  
IN  
Output Leakage Current  
Capacitance in Disabled Mode  
Channel Bandwidth  
IOL  
COUT  
BW  
ISINK  
Disable Pin = < 0.8V, VO = 0.5V  
VOUT = 0V, frequency = 1MHz  
35  
37  
MHz  
mA  
Termination Sink Current, per Channel  
VOUT = 4V  
Copyright © 1997  
Rev. 1.2b  
3
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7  
LX5115  
UltraMAX  
U L T R A 9 - C H A N N E L S C S I T E R M I N A T O R  
P R O D U C T I O N D A T A S H E E T  
BLOCK DIAGRAM  
TERM POWER  
CURRENT  
BIASING  
CIRCUIT  
THERMAL  
LIMITING  
CIRCUIT  
24mA CURRENT  
LIMITING CIRCUIT  
DATA OUTPUT  
PIN DB(0)  
2.85V  
DISABLE  
PIN  
1.4V  
1 OF 9 CHANNELS  
FUNCTIONAL DESCRIPTION  
Cable transmission theory suggests to optimize signal speed  
and quality, the termination should act both as an ideal voltage  
reference when the line is released (deasserted) and as an  
ideal current source when the line is active (asserted). Common  
active terminators, which consist of  
by delivering 24mA on assertion and by imposing 2.85V on  
deassertion. In order to disable the device, the Disable pin  
must be driven logic Low. This mode of operation places  
the device in a sleep state where a meager 150µA of quiescent  
current is consumed. Additionally, all  
Linear Regulators in series with resis-  
outputs are in a Hi-Z (impedance)  
state. Sleep mode can be used for  
POWER UP / POWER DOWN FUNCTION TABLE  
tors (typically 110), are a compro-  
mise. As the line voltage increases,  
the amount of current decreases lin-  
Disable  
LX5115  
Quiescent  
Current  
power conservation or to completely  
eliminate the terminator from the SCSI  
chain. In the second case, termination  
node capacitance is important to  
consider. The terminator will appear  
as a parasitic distributed capacitance  
on the line, which can detract from bus  
performance. For this reason, the  
Outputs  
early by the equation V = I R. The  
*
H
L
Open  
Enabled  
HI Z  
Enabled  
5.5mA  
150µA  
5.5mA  
LX5115, with its unique new architec-  
ture applies the maximum amount of  
current regardless of line voltage until  
the termination high threshold (2.85V)  
is reached.  
Acting as a near ideal line terminator, the LX5115 closely  
reproduces the optimum case when the device is enabled.  
To enable the device the Disable Pin must be pulled Logic  
High or left open. During this mode of operation, quiescent  
current is 5.5mA and the device will respond to line demands  
LX5115 has been optimized to have only 3pF of capacitance  
per output in the sleep state.  
An additional feature of the LX5115 is its compatibility with  
active negation drivers. The device handles up to 37mA of  
sink current for drivers which exceed the 2.85V output high.  
UltraMAX is a trademark of Linfinity Microelectronics Inc.  
PRODUCTIONDATA-InformationcontainedinthisdocumentisproprietarytoLinFinity, andiscurrentasofpublicationdate. Thisdocument  
may not be modified in any way without the express written consent of LinFinity. Product processing does not necessarily include testing of  
all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time.  
Copyright © 1997  
Rev. 1.2b  
4

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