Microsemi LX5112ACDP Ult ra 9 - channel scsi terminator Datasheet

LIN D O C #: 51115
UltraMAX
TM
LX5111A/5112A
U LT R A 9 - CHANNEL S C S I TE R M I N ATOR
T
H E
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 E L I M I N A R Y
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
D
A T A
S
H E E T
K E Y F E AT U R E S
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 productline 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.
■ 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 LinFinity's 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
Driver
Receiver
NOTE:
1 Meter, AWG 28
LX5111A/5112A
LX5111A/5112A
LX5268
LX5268
PA C K A G E O R D E R I N F O R M AT I O N
TA (°C)
SOIC
DP Plastic
16-pin, Power
TSSOP
PWP Plastic
24-pin, Power
0 to 70
LX5111ACDP
LX5112ACDP
LX5111ACPWP
LX5112ACPWP
For An In-Depth
Discussion On Applying
SCSI, Request Linfinity
Application Note:
"Understanding The SingleEnded SCSI Bus"
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5111ACDPT)
Copyright © 1999
Rev. 0.1 3/99
LINFINITY MICROELECTRONICS INC.
11861 W ESTERN A VENUE, G ARDEN G ROVE, CA. 92841, 714-898-8121, F AX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
UltraMAX
LX5111A/5112A
U LT R A 9 - CHANNEL S C S I TE R M I N ATOR
P
R E L I M I N A R Y
A B S O L U T E M A X I M U M R AT I N G S
D
A T A
S
H E E T
PACKAGE PIN OUTS
(Note 1)
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
T7
T8
T9
HEATSINK/GND
GND
DISCONNECT *
T1
T2
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.
T H E R MAL DATA
DP PACKAGE:
THERMAL RESISTANCE-JUNCTION TO LEADS, θJL
20°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA
50°C/W
PWP PACKAGE:
THERMAL RESISTANCE-JUNCTION TO LEADS, θJL
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA
27°C/W
100°C/W
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θ JA numbers are guidelines for the thermal performance of the device/pc-board
system. All of the above assume no ambient airflow.
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
T6
T5
N.C.
HEATSINK/GND
HEATSINK/GND
VTERM
T4
T3
DP PACKAGE
(Top View)
T7
T8
T9
N.C.
GND
HEATSINK/GND
HEATSINK/GND
HEATSINK/GND
HEATSINK/GND
DISCONNECT *
T1
T2
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
T6
T5
N.C.
N.C.
HEATSINK/GND
HEATSINK/GND
HEATSINK/GND
HEATSINK/GND
N.C.
VTERM
T4
T3
PWP PACKAGE
(Top View)
* Pin 10 is DISCONNECT for the LX5112A,
and DISCONNECT for the LX5111A.
2
Copyright © 1999
Rev. 0.1 3/99
PRODUCT DATABOOK 1996/1997
UltraMAX
LX5111A/5112A
U LT R A 9 - CHANNEL S C S I TE R M I N ATOR
P
R E L I M I N A R Y
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
Symbol
Termination Voltage
High Level Enable Input Voltage
LX5111A
LX5112A
LX5111A
LX5112A
Low Level Disable Input Voltage
VTERM
VIH
VIL
Operating Virtual Junction Temperature Range
LX5111AC/5112AC
(Note 2)
Recommended Operating Conditions
Min.
Typ.
Max.
Units
3.0
2.5
0
0
2.5
5.5
VTERM
0.8
0.8
VTERM
V
V
V
V
V
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 temperature of TA = 25°C. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.
Parameter
Symbol
Output High Voltage
VOUT
TermPwr Supply Current
ICC
LX5111A
LX5112A
Output Current
IOUT
DISCONNECT Input Current
LX5111A
IIN
DISCONNECT Input Current
LX5112A
IIN
LX5111A
LX5112A
Capacitance in DISCONNECT Mode
Channel Bandwidth
Termination Sink Current, per Channel
IOL
Output Leakage Current
Copyright © 1999
Rev. 0.1 3/99
COUT
BW
I SINK
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
VOUT = 0.5V, Term Power = 4.75V
VOUT = 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
VOUT = 0V, frequency = 1MHz
VOUT = 4V
LX5111A/5112A
Min.
Typ.
Max.
2.65
2.1
-21
-17
7
2.82
2.2
5
205
275
275
-23
-18
10
40
-14
10
10
10
3
35
11
9
225
-24
Units
V
V
mA
mA
µA
µA
mA
mA
nA
µA
µA
nA
nA
nA
pF
MHz
mA
3
PRODUCT DATABOOK 1996/1997
UltraMAX
LX5111A/5112A
U LT R A 9 - CHANNEL S C S I TE R M I N ATOR
P
R E L I M I N A R Y
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 conPOWER UP / POWER DOWN FUNCTION 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 conDISCONNECT DISCONNECT
Current
V = I * R. The LX5111A/5112A, with
servation or to completely eliminate
their unique new architecture apthe 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 capaciActing 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. 0.1 3/99
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