LIN D
O C
#:
5115
UltraMAX
T
H E
TM
LX5115
D
A T A
U LT R A 9 - C
HANNEL
S C S I T
E R M I N ATOR
I
N F I N I T E
P
O W E R
O F
I
N N O VA T I O N
P
R O D U C T I O N
S
H E E T
DESCRIPTION
The LX5115 SCSI terminator is part of Linfinity's
UltraMAX family of high-performance, adaptive,
non-linear mode SCSI products, which are de-
signed to deliver true UltraSCSI performance in
SCSI applications. The low voltage BiCMOS ar-
chitecture employed in its design offers superior
performance to older linear passive and active
techniques. 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 to-
day.
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
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 has a TTL
compatible sleep/disable mode. 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
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.
K E Y F E AT U R E S
s
ULTRA-FAST RESPONSE FOR FAST-20
SCSI APPLICATIONS
s
35MHz CHANNEL BANDWIDTH
s
LESS THAN 3pF OUTPUT CAPACITANCE
s
SLEEP-MODE CURRENT OF 150µA
s
NO EXTERNAL COMPENSATION
CAPACITORS
s
IMPLEMENTS 8-BIT OR 16-BIT (WIDE)
APPLICATIONS
s
COMPATIBLE WITH ACTIVE NEGATION
DRIVERS (37mA / CHANNEL)
s
COMPATIBLE WITH PASSIVE AND
ACTIVE TERMINATIONS
s
APPROVED FOR USE WITH SCSI 1, 2, 3
AND ULTRA SCSI
s
HOT SWAP COMPATIBLE
s
PIN-FOR-PIN COMPATIBLE WITH
DS21S07A / 2105
NOTE:
For current data & package dimensions, visit our web site:
http://www.linfinity.com.
PRODUCT HIGHLIGHT
R
E C E I V I N G
W
AV E F O R M
- 2 0 M H
Z
D
R I V I N G
W
AV E F O R M
- 2 0 M H
Z
Receiver
1 Meter, AWG 28
LX5115
LX5268
Driver
LX5115
LX5268
NOTE:
For An In-Depth
Discussion On Applying
SCSI, Request Linfinity
Application Note:
"Understanding The Single-
Ended SCSI Bus"
PA C K A G E O R D E R I N F O R M AT I O N
T
J
(°C)
0 to 70
D
Plastic SOIC
16-pin
LX5115CD
DW
Plastic SOWB
16-pin
LX5115CDW
PWP
Plastic TSSOP
20-pin, Power
LX5115CPWP
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5115CDWT)
Copyright © 1997
Rev. 1.1 12/97
L
IN
F
INITY
M
ICROELECTRONICS
I
NC
.
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841, 714-898-8121, F
AX
: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
LX5115
U LT R A 9 - C
HANNEL
S C S I T
E R M I N ATOR
P
R O D U C T I O N
UltraMAX
D
A T A
S
H E E T
A B S O L U T E M A X I M U M R AT I N G S
(Note 1)
PA C K A G E P I N O U T S
TERM POWER
D0
D1
D2
D3
D4
N.C.
GND
16
2
3
4
5
6
7
8
15
14
13
12
11
10
9
Continuous Termination Voltage .......................................................................... 10V
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
Note 1. Exceeding these ratings could cause damage to the device.
DISABLE
N.C.
D8
D7
D6
D5
N.C.
N.C.
T H ER MAL DATA
D PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θ
JA
DW PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θ
JA
PWP PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θ
JA
139°C/W
95°C/W
120°C/W
TERM POWER
D0
D1
D2
D3
D4
N.C.
GND
D PACKAGE
(Top View)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
θ
JA
).
The
θ
JA
numbers are guidelines for the thermal performance of the device/pc-board system.
All of the above assume no ambient airflow.
DISABLE
N.C.
N.C.
D8
D7
D6
D5
N.C.
DW PACKAGE
(Top View)
TERM POWER
HEATSINK/GND
D0
D1
D2
D3
D4
HEATSINK/GND
N.C.
GND
20
2
3
4
5
6
7
8
9
10
19
18
17
16
15
14
13
12
11
DISABLE
N.C.
HEATSINK/GND
N.C.
D8
D7
D6
D5
HEATSINK/GND
N.C.
PWP PACKAGE
(Top View)
2
Copyright © 1997
Rev. 1.1 12/97
PRODUCT DATABOOK 1996/1997
UltraMAX
U LT R A 9 - C
HANNEL
S C S I T
E R M I N ATOR
P
R O D U C T I O N
LX5115
D
A T A
S
H E E T
R E C O M M E N D E D O P E R AT I N G C O N D I T I O N S
Parameter
Termination Voltage
High Level Enable Input Voltage
Low Level Disable Input Voltage
Operating Virtual Junction Temperature Range
LX5115C
Note 2. Range over which the device is functional.
(Note 2)
Symbol
V
TERM
V
IH
V
IL
Recommended Operating Conditions
Min.
Typ.
Max.
4.0
2
0
0
5.5
V
TERM
0.8
125
Units
V
V
V
°C
ELECTRICAL CHARACTERISTICS
Term Power = 4.75V unless otherwise specified.
Unless otherwise specified, these specifications apply at the recommended operating ambient tempera-
ture of T
A
= 25°C. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.
Parameter
Output High Voltage
TermPwr Supply Current
Symbol
V
OUT
I
CC
Test Conditions
LX5115
Min. Typ.
Max.
2.65
2.85
5.5
210
150
-23
10
-15
20
3
35
37
9
225
-24
Units
V
mA
mA
µA
mA
nA
µA
nA
pF
MHz
mA
Output Current
Disable Input Current
Output Leakage Current
Capacitance in Disabled Mode
Channel Bandwidth
Termination Sink Current, per Channel
I
OUT
I
IN
I
OL
C
OUT
BW
I
SINK
All data lines = open
All data lines = 0.5V
Disable Pin < 0.8V
V
OUT
= 0.5V
Disable Pin = 4.75V
Disable Pin = 0V
Disable Pin = < 0.8V, V
O
= 0.5V
V
OUT
= 0V, frequency = 1MHz
V
OUT
= 4V
-21
Copyright © 1997
Rev. 1.1 12/97
3
PRODUCT DATABOOK 1996/1997
LX5115
U LT R A 9 - C
HANNEL
S C S I T
E R M I N ATOR
P
R O D U C T I O N
UltraMAX
D
A T A
S
H E E T
BLOCK DIAGRAM
TERM POWER
THERMAL
LIMITING
CIRCUIT
CURRENT
BIASING
CIRCUIT
24mA CURRENT
LIMITING CIRCUIT
DATA OUTPUT
PIN DB(0)
2.85V
DISABLE
PIN
1.4V
1 OF 9 CHANNELS
FUNCTIONAL DESCRIPTION
by delivering 24mA on assertion and by imposing 2.85V on
Cable transmission theory suggests to optimize signal speed
deassertion. In order to disable the device, the Disable pin
and quality, the termination should act both as an ideal voltage
must be driven logic
Low.
This mode of operation places
reference when the line is released (deasserted) and as an
the device in a sleep state where a meager 150µA of quiescent
ideal current source when the line is active (asserted). Common
current is consumed. Additionally, all
active terminators, which consist of
Linear Regulators in series with resis-
P
OWER
U
P
/ P
OWER
D
OWN
F
UNCTION
T
ABLE
outputs are in a Hi-Z (impedance)
state. Sleep mode can be used for
tors (typically 110Ω), are a compro-
power conservation or to completely
mise. As the line voltage increases,
Disable
Quiescent
Outputs
eliminate the terminator from the SCSI
the amount of current decreases lin-
LX5115
Current
chain. In the second case, termination
early by the equation V = I * R. The
H
Enabled
5.5mA
node capacitance is important to
LX5115, with its unique new architec-
L
HI Z
150µA
consider. The terminator will appear
ture applies the maximum amount of
as a parasitic distributed capacitance
current regardless of line voltage until
Open
Enabled
5.5mA
on the line, which can detract from bus
the termination high threshold (2.85V)
performance. For this reason, the
is reached.
LX5115 has been optimized to have only 3pF of capacitance
Acting as a near ideal line terminator, the LX5115 closely
per output in the sleep state.
reproduces the optimum case when the device is enabled.
An additional feature of the LX5115 is its compatibility with
To enable the device the Disable Pin must be pulled Logic
active negation drivers. The device handles up to 37mA of
High or left open. During this mode of operation, quiescent
sink current for drivers which exceed the 2.85V output high.
current is 5.5mA and the device will respond to line demands
UltraMAX is a trademark of Linfinity Microelectronics Inc.
PRODUCTION DATA - Information contained in this document is proprietary to Lin Finity, and is current as of publication date. This document
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.
4
Copyright © 1997
Rev. 1.1 12/97
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