Not Recommended For New Design
UltraMAX
T
H E
™
LX5111A / 5112A
D
A T A
ULTRA 9-C
HANNEL
SCSI T
ERMINATOR
I
N F I N I T E
P
O W E R
O F
I
N N O V A T I O N
P
R E L I M I N A R Y
S
H E E T
DESCRIPTION
The LX5111A/5112A SCSI terminators are part
of 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
their 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 today. Another
key improvement offered by the LX5111A/12A lies
in their 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
LX5111A/12A architecture is much more tolerant
of marginal system integrations. Recognizing the
needs of portable and configurable peripherals, the
LX5111A/12A have a TTL compatible
sleep/disable mode. Quiescent current is typically
less than 275µA 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 LX5111A/12A's
architecture. Traditional termination techniques
require large stabilization and transient protection
capacitors of up to 20µF in value and size. The
LX5111A/12A architecture does not require these
components, allowing all the cost savings
associated with inventory, board space, assembly,
reliability, and component costs.
KEY FEATURES
Ultra-Fast Response For FAST-
20 SCSI Applications
35MHz Channel Bandwidth
3.0V Operation
Less Than 3pF Output
Capacitance
Thermally Self-Limiting
NO External Compensation
Capacitors
Implements 8-bit Or 16-bit (
Wide) Applications
Compatible with Active Negation
Drivers
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
LX5211 and UC5606 (LX5111)
Pin-For-Pin Compatible With
LX5212 And UC5603/5613/5614
(LX5112)
IMPORTANT:
For the most current data, consult
MICROSEMI’s
website:
http://www.microsemi.com
PRODUCT HIGHLIGHT
T
A
(°C)
0 to 70
DP
PACKAGE ORDER INFO
Plastic TSSOP
Plastic SOIC
PWP
24-Pin, Power
16-Pin, Power
LX5111ACDP
LX5112ACDP
LX5111ACPWP
LX5112ACPWP
ROHS Compliant / Pb-free
transition DC: 0440
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e.
LX5111ACDP-TR)
Copyright
©
1999
Rev. 0.2a,2005-03-10
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
LX5111A/5112A
U LT R A 9 - C
HANNEL
S C S I T
E R M I N ATOR
P
R E L I M I N A R Y
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)
PACKAGE PIN OUTS
T7
T8
T9
HEATSINK/GND
GND
DISCONNECT *
T1
T2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
TermPwr Voltage ................................................................................................. +7V
Signal Line Voltage ................................................................................... 0V to +7V
Regulator Output Current ................................................................................... 0.4A
Operating Junction Temperature
Plastic (DP, PWP Packages) ........................................................................ 150°C
Storage Temperature Range .............................................................. -65°C to 150°C
Lead Temperature (Soldering, 10 seconds) .................................................... 300°C
Peak Packge Solder Reflow Temp. (40 second max. exposure)................................. 260°C (+0, -5)
Note 1. Exceeding these ratings could cause damage to the device. All voltages are with
respect to Ground. Currents are positive into, negative out of the specified
terminal.
T6
T5
N.C.
HEATSINK/GND
HEATSINK/GND
V
TERM
T4
T3
DP PACKAGE
(Top View)
RoHS / Pb-free 100% Matte Tin Lead Finish
T7
T8
T9
N.C.
GND
HEATSINK/GND
HEATSINK/GND
HEATSINK/GND
HEATSINK/GND
DISCONNECT *
T1
T2
T6
T5
N.C.
N.C.
HEATSINK/GND
HEATSINK/GND
HEATSINK/GND
HEATSINK/GND
N.C.
V
TERM
T4
T3
T H E R M A L D ATA
DP PACKAGE:
THERMAL RESISTANCE-JUNCTION TO LEADS,
θ
JL
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θ
JA
PWP PACKAGE:
THERMAL RESISTANCE-JUNCTION TO LEADS,
θ
JL
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θ
JA
27°C/W
100°C/W
20°C/W
50°C/W
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
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.
PWP PACKAGE
(Top View)
*
Pin 10 is
DISCONNECT
for the LX5112A,
and
DISCONNECT
for the LX5111A.
2
Copyright © 1999
Rev. 0.2a
11/04
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 E L I M I N A R Y
LX5111A/5112A
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
LX5111AC/5112AC
Note 2. Range over which the device is functional.
(Note 2)
Symbol
V
TERM
V
IH
V
IL
Recommended Operating Conditions
Min.
Typ.
Max.
3.0
2.5
0
0
2.5
0
5.5
V
TERM
0.8
0.8
V
TERM
125
Units
V
V
V
V
V
°C
LX5111A
LX5112A
LX5111A
LX5112A
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
LX5111A
LX5112A
Output Current
DISCONNECT Input Current
DISCONNECT Input Current
Output Leakage Current
LX5111A
LX5112A
Symbol
V
OUT
I
CC
Test Conditions
Term Power = 4.75V
Term Power = 3.0V
All data lines = open
All data lines = 0.5V
DISCONNECT Pin < 0.8V
DISCONNECT Pin > 2.0V
V
OUT
= 0.5V, Term Power = 4.75V
V
OUT
= 0.5V, Term Power = 3.0V
DISCONNECT Pin = 4.75V
DISCONNECT Pin = 0V
DISCONNECT Pin = 0V
DISCONNECT Pin = 4.75V
DISCONNECT Pin = < 0.8V, V
O
= 0.5V
DISCONNECT Pin = > 2.0V, V
O
= 0.5V
V
OUT
= 0V, frequency = 1MHz
V
OUT
= 4V
LX5111A/5112A
Min. Typ.
Max.
2.65
2.1
2.82
2.2
5
205
275
275
-23
-18
10
40
-14
10
10
10
3
35
11
Units
V
V
mA
mA
µA
µA
mA
mA
nA
µA
µA
nA
nA
nA
pF
MHz
mA
9
225
I
OUT
I
IN
I
IN
I
OL
C
OUT
BW
I
SINK
-21
-17
-24
LX5111A
LX5112A
Capacitance in DISCONNECT Mode
Channel Bandwidth
Termination Sink Current, per Channel
7
Copyright © 1999
Rev. 0.2a
11/04
3
PRODUCT DATABOOK 1996/1997
LX5111A/5112A
U LT R A 9 - C
HANNEL
S C S I T
E R M I N ATOR
P
R E L I M I N A R Y
UltraMAX
D
A T A
S
H E E T
BLOCK DIAGRAM
TERM POWER
CURRENT
BIASING
CIRCUIT
24mA CURRENT
LIMITING CIRCUIT
DATA OUTPUT
PIN DB(0)
2.85V
DISCONNECT (5111)
DISCONNECT (5112)
1.4V
1 OF 9 CHANNELS
FUNCTIONAL DESCRIPTION
Cable transmission theory suggests to optimize signal speed
demands by delivering 24mA on assertion, and by imposing
and quality, the termination should act both as an ideal voltage
2.85V on deassertion. In order to disable the device, the
reference when the line is released (deasserted) and as an ideal
DISCONNECT pin (DISCONNECT pin for the LX5112A) must
current source when the line is active (asserted). Common
be driven logic
Low
(logic
High
for the LX5112A). This mode
active terminators, which consist of Linear Regulators in series
of operation places the devices in a sleep state where a meager
with resistors (typically 110Ω), are
275µA of quiescent current is con-
P
OWER
U
P
/ P
OWER
D
OWN
F
UNCTION
T
ABLE
a compromise. As the line voltage
sumed. Additionally, all outputs are
increases, the amount of current
LX5111A LX5112A
Quiescent
in a Hi-Z (impedance) state. Sleep
Outputs
decreases linearly by the equation
mode can be used for power con-
DISCONNECT DISCONNECT
Current
V = I * R. The LX5111A/5112A, with
servation or to completely eliminate
their unique new architecture ap-
the terminator from the SCSI chain.
H
L
Enabled
6mA
plies the maximum amount of
In the second case, termination
L
H
HI Z
275µA
current regardless of line voltage
node capacitance is important to
Open
Open
HI Z
275µA
until the termination high threshold
consider. The terminators will ap-
(2.85V) is reached.
pear as a parasitic distributed capaci-
Acting as a near ideal line terminators, the LX5111A/5112A
tance on the line, which can detract from bus performance. For
closely reproduce the optimum case when the devices are
this reason, the LX5111A/5112A have been optimized to have
enabled. To enable the device the DISCONNECT pin
only 3pF of capacitance per output in the sleep state.
(DISCONNECT pin for the LX5112A) must be pulled logic
High
An additional feature of the LX5111A/5112A IC's are their
(logic
Low
for the LX5112A). During this mode of operation,
compatibility with active negation drivers.
quiescent current is 6mA and the devices will respond to line
UltraMAX is a trademark of Linfinity Microelectronics Inc.
PRELIMINARY DATA - Information contained in this document is pre-production data, and is proprietary to LinFinity. It may
not modified in any way without the express written consent of LinFinity. Product referred to herein is offered in sample form
only, and Linfinity reserves the right to change or discontinue this proposed product at any time.
4
Copyright © 1999
Rev. 0.2a
11/04
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