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LIN DOC #:
5219
UltraMAX
ULTRA 9-CHANNEL SCSI TERMINATOR
THE INFINITE POWER OF INNOVATION
DESCRIPTION KEY FEATURES
The LX5219 SCSI terminator is part of Linfinity's
UltraMAX family of high-performance, adaptive, nonlinear 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. 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. It is approved for use with SCSI1, -2, -3, UltraSCSI and beyond — providing the
highest performance alternative available today.
Another key improvement offered by the LX5219
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 con-
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
trolled by the peripheral or host designer and, when
problems occur, they are the first to be made aware
of the problem. The LX5219 architecture is much
more tolerant of marginal system integrations.
Recognizing the needs of portable and
configurable peripherals, the LX5219 has an active
low 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 sleepmode 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 LX5219 architecture. Traditional termination
techniques require large stabilization and transient
protection capacitors of up to 20µF in value and
size. The LX5219 architecture does not require these
components, allowing all the cost savings associated
with inventory, board space, assembly, reliability,
and component costs.
P RODUCTION DATA SHEET
TM
LX5219
■ ULTRA-FAST RESPONSE FOR FAST-20
SCSI APPLICATIONS
■ HOT SWAP COMPATIBLE
■ 35MHz CHANNEL BANDWIDTH
■ 3.5V OPERATION
■ LESS THAN 3pF OUTPUT CAPACITANCE
■ SLEEP-MODE CURRENT LESS THAN
275µA
■ THERMALLY SELF LIMITING
NO EXTERNAL COMPENSATION
■
CAPACITORS
■ IMPLEMENTS 8-BIT OR 16-BIT (
APPLICATIONS
■ COMPATIBLE WITH ACTIVE NEGATION
DRIVERS (60mA / CHANNEL)
■ COMPATIBLE WITH PASSIVE AND
ACTIVE TERMINATIONS
■ APPROVED FOR USE WITH SCSI 1, 2, 3
AND ULTRASCSI
■ CONSULT FACTORY FOR APPLICATION
TEST REPORT
■ EVALUATION BOARD AVAILABLE
WIDE
)
PRODUCT HIGHLIGHT
DRIVING WAVEFORM - 20MHZRECEIVING WAVEFORM - 20MHZ
Receiver
1 Meter, AWG 28
LX5219 LX5219
LX5268 LX5268
PACKAGE ORDER INFORMATION
T
(°C)
J
Plastic SOWB
DW PW
16-pin
0 to 70 LX5219CDW LX5219CPW
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5219CDWT)
Driver
Plastic TSSOP
20-pin
NOTE:
For An In-Depth
Discussion On Applying
SCSI, Request Linfinity
Application Note:
"Understanding The
Single-Ended SCSI Bus"
Copyright © 1998
Rev. 1.8 3/98
L INFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
Page 2
PRODUCT DATABOOK 1996/1997
LX5219
ULTRA 9-CHANNEL SCSI TERMINATOR
RODUCTION DATA SHEET
P
ABSOLUTE MAXIMUM RATINGS (Note 1)
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.
THERMAL DATA
DW PACKAGE:
D
x θ
θθ
θ
θθ
JA
θθ
θ
θθ
JA
).
JA
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
PW PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
Junction Temperature Calculation: TJ = TA + (P
numbers are guidelines for the thermal performance of the device/pc-board system.
The θ
JA
All of the above assume no ambient airflow.
95°C/W
144°C/W
UltraMAX
PACKAGE PIN OUTS
TERM POWER
GND
TERM POWER
N.C.
N.C.
D0
D1
D2
D3
D4
N.C.
GND
1 16
215
N.C.
314
D0
413
D1
512
D2
611
D3
710
D4
89
DW PACKAGE
(Top View)
219
318
417
516
615
714
813
912
10 11
20
TERM POWER
N.C.
DISABLE
D8
D7
D6
D5
GND
TERM POWER
DISABLE
N.C.
D8
D7
N.C.
D6
D5
N.C.
GND
PW PACKAGE
(Top View)
2
Copyright © 1998
Rev. 1.8 3/98
Page 3
PRODUCT DATABOOK 1996/1997
UltraMAX
LX5219
ULTRA 9-CHANNEL SCSI TERMINATOR
P RODUCTION DATA SHEET
RECOMMENDED OPERATING CONDITIONS (Note 2)
Parameter
Termination Voltage V
High Level Disable Input Voltage V
Low Level Disable Input Voltage V
Operating Virtual Junction Temperature Range
LX5219C
Note 2. Range over which the device is functional.
Symbol
TERM
IH
IL
ELECTRICAL CHARACTERISTICS
Term Power = 4.75V unless otherwise specified. Unless otherwise specified, these specifications apply at the recommended operating ambient temperature of T
= 25°C. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.
A
Parameter
Output High Voltage V
TermPwr Supply Current I
Output Current I
Disable Input Current Disable Pin = 4.75V
Output Leakage Current Disable Pin = < 0.8V, V
Capacitance in Disabled Mode C
Channel Bandwidth BW
Termination Sink Current, per Channel I
Symbol
OUT
CC
OUTVOUT
OUTVOUT
SINKVOUT
Test Conditions Units
All data lines = open
All data lines = 0.5V
Disable Pin < 0.8V
= 0.5V
Disable Pin = 0V
= 0V, frequency = 1MHz
= 4V
= 0.5V
O
Recommended Operating Conditions
Min. Typ. Max.
3.5 5.5 V
2V
0 0.8 V
0 125 °C
TERM
LX5219
Min. Typ. Max.
2.65 2.85 V
69mA
215 225 mA
375 µA
-21 -23 -24 mA
10 nA
-90 µA
10 nA
3pF
35 MHz
60 mA
Units
V
Copyright © 1998
Rev. 1.8 3/98
3
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PRODUCT DATABOOK 1996/1997
T
LX5219
DISABLE
PIN
1.4V
TERM POWER
THERMAL
LIMITING
ULTRA 9-CHANNEL SCSI TERMINATOR
RODUCTION DATA SHEET
P
BLOCK DIAGRAM
CURRENT
BIASING
CIRCUIT
CIRCUIT
24mA CURRENT
LIMITING CIRCUIT
2.85V
UltraMAX
DATA OUTPU
PIN DB(0)
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 Linear Regulators
in series with resistors (typically
110Ω), are a compromise. As the
line voltage increases, the amount
of current decreases linearly by the
equation V = I * R. The LX5219,
with its unique new architecture
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 LX5219 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 6mA and the device will respond to line demands
POWER UP / POWER DOWN FUNCTION TABLE
Disable
(LX5219) Current
H Enabled 6mA
L HI Z 275µA
Open Enabled 6mA
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 275µA of quiescent
current is consumed. Additionally, all outputs are in a Hi-Z
(impedance) state. Sleep mode can
be used for power conservation or
Outputs
LX5219 has been optimized to have only 3pF of capacitance
per output in the sleep state.
An additional feature of the LX5219 is its compatibility with
active negation drivers. The device handles up to 60mA of
sink current for drivers which exceed the 2.85V output high.
Quiescent
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
4
Copyright © 1998
Rev. 1.8 3/98
Page 5
PRODUCT DATABOOK 1996/1997
UltraMAX
ULTRA 9-CHANNEL SCSI TERMINATOR
P RODUCTION DATA SHEET
GRAPH / CURVE INDEX
Waveforms
FIGURE #
1A. RECEIVING WAVEFORM (Freq. = 1.0MHz)
1B. DRIVING WAVEFORM
2A. RECEIVING WAVEFORM (Freq. = 5.0MHz)
2B. DRIVING WAVEFORM
3. 10MHz WAVEFORM
4. 20MHz WAVEFORM
Characteristic Curves
FIGURE #
5. OUTPUT HIGH VOLTAGE vs. JUNCTION TEMPERATURE
6. OUTPUT CURRENT vs. JUNCTION TEMPERATURE
7. OUTPUT CURRENT vs. OUTPUT HIGH VOLTAGE (V
8. OUTPUT CURRENT vs. OUTPUT HIGH VOLTAGE (VT = 3.3V)
9. TERMINATION VOLTAGE vs. SUPPLY CURRENT
10. TERMPWR SUPPLY CURRENT vs. TERMINATION VOLTAGE (Disabled)
— LX5219
11. OUTPUT HIGH VOLTAGE vs. JUNCTION TEMPERATURE (V
12. OUTPUT CURRENT vs. JUCTION TEMPERATURE (VT = 3.3V)
13. OUTPUT HIGH VOLTAGE vs. TERMINATION VOLTAGE
14. OUTPUT CURRENT vs. TERMINATION VOLTAGE
15. OUTPUT CURRENT MATCHING CHANNEL TO CHANNEL
= 4.75V)
T
= 3.3V)
T
LX5219
FIGURE INDEX
Application Circuits
FIGURE #
16. 8-BIT SCSI SYSTEM APPLICATION
Copyright © 1998
Rev. 1.8 3/98
5
Page 6
PRODUCT DATABOOK 1996/1997
)
LX5219
FIGURE 1A. —
3.5
3
2.5
2
1.5
1
Line Voltage - (V)
0.5
ULTRA 9-CHANNEL SCSI TERMINATOR
RODUCTION DATA SHEET
P
CHARACTERISTIC CURVES
RECEIVING WAVEFORM FIGURE 1B. — DRIVING WAVEFORM
3.5
freq.=1.03844MHz
Line Voltage - (V)
freq.=1.00266MHz
3
2.5
2
1.5
1
0.5
UltraMAX
GND
-0.5
Time - (250ns/Div.)
Fig. 1A
LX5219 LX5219
END-DRIVEN CABLE
Receiver
6 Meter, 92Ω
75C08 75C08
GND
-0.5
Time - (250ns/Div.
Driver
Fig. 1B
6
Copyright © 1998
Rev. 1.8 3/98
Page 7
PRODUCT DATABOOK 1996/1997
)
)
UltraMAX
FIGURE 2A. —
3.5
freq.=5.0092MHz
3
2.5
2
1.5
1
Line Voltage - (V)
0.5
LX5219
ULTRA 9-CHANNEL SCSI TERMINATOR
P RODUCTION DATA SHEET
CHARACTERISTIC CURVES
RECEIVING WAVEFORM FIGURE 2B. — DRIVING WAVEFORM
3.5
freq.=4.9961MHz
3
2.5
2
1.5
1
Line Voltage - (V)
0.5
GND
-0.5
GND
-0.5
Time - (50ns/Div.
END-DRIVEN CABLE
Receiver
Driver
Fig. 2A
6 Meter, 92Ω
LX5219 LX5219
75C08 75C08
Time - (50ns/Div.
Fig. 2B
Copyright © 1998
Rev. 1.8 3/98
7
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PRODUCT DATABOOK 1996/1997
)
)
LX5219
FIGURE 3. —
4
3
2
1
0
4
Line Voltage - (V)
ULTRA 9-CHANNEL SCSI TERMINATOR
RODUCTION DATA SHEET
P
CHARACTERISTIC CURVES
10MHz WAVEFORM FIGURE 4. — 20MHz WAVEFORM
4
Ch2 Freq.=10.096MHz
#2
#1
#3
Line Voltage - (V)
Ch2 Freq.=20.020MHz
3
2
1
0
4
#1
UltraMAX
#2
#3
GND
GND
Time - (20ns/Div.
END-DRIVEN CABLE
4.75V 4.75V
12
6 Meter, 72Ω
LX5219 LX5219
LX5268
3
LX5268
Time - (10ns/Div.
8
Copyright © 1998
Rev. 1.8 3/98
Page 9
PRODUCT DATABOOK 1996/1997
0
15
(TJ) Junction Temperature - (°C)
(I
OUT
) Output Current - (mA)
20
5025 75 100
25
10
5
30
125
VT = 4.75V
UltraMAX
FIGURE 5. —
4.5
4
3.5
3
) Output High Voltage - (V)
2.5
OUT
(V
LX5219
ULTRA 9-CHANNEL SCSI TERMINATOR
P RODUCTION DATA SHEET
CHARACTERISTIC CURVES
OUTPUT HIGH VOLTAGE vs. JUNCTION TEMP. FIGURE 6. — OUTPUT CURRENT vs. JUNCTION TEMP.
2
0
FIGURE 7. — OUTPUT CURRENT vs. OUTPUT HIGH VOLTAGE FIGURE 8. — OUTPUT CURRENT vs. OUTPUT HIGH VOLTAGE
20
15
10
) Output Current - (mA)
OUT
(I
5
0
00.8
5025 75 100
(TJ) Junction Temperature - (°C)
0.4
(V
) Output High Voltage - (V)
OUT
1.61.2 2 2.4
VT = 4.75V
= 25°C
T
A
2.8253.2
125
20
15
10
) Output Current - (mA)
OUT
(I
5
0
0.4
00.8
(V
) Output High Voltage - (V)
OUT
VT = 3.3V
T
1.61.2 2 2.4
= 25°C
A
2.8253.2
Copyright © 1998
Rev. 1.8 3/98
9
Page 10
PRODUCT DATABOOK 1996/1997
LX5219
FIGURE 9. —
7
6
5
4
3
2
) TermPwr Supply Current - (mA)
CC
1
(I
ULTRA 9-CHANNEL SCSI TERMINATOR
TERMPWR SUPPLY CURRENT
vs. TERMINATION VOLTAGE
RODUCTION DATA SHEET
P
CHARACTERISTIC CURVES
FIGURE 10. — LX5219 TERMPWR SUPPLY CURRENT
500
450
400
350
300
250
200
150
100
) TermPwr Supply Current - (µA)
CC
(I
50
UltraMAX
vs. TERMINATION VOLTAGE (Disabled)
0
2.5
3
(V
TERM
3.5
4.5455.5
) Termination Voltage - (V)
6
0
0
1
(V
2
) Termination Voltage - (V)
TERM
435
FIGURE 11. — OUTPUT HIGH VOLTAGE vs. JUNCTION TEMP. FIGURE 12. — OUTPUT CURRENT vs. JUNCTION TEMP.
4.5
VT = 3.3V
4
3.5
3
) Output High Voltage - (V)
2.5
OUT
30
VT = 3.3V
25
20
15
) Output Current - (mA)
OUT
(I
10
(V
2
0
5025 75 100
125
5
0
5025 75 100
6
125
10
(TJ) Junction Temperature - (°C)
(TJ) Junction Temperature - (°C)
Copyright © 1998
Rev. 1.8 3/98
Page 11
PRODUCT DATABOOK 1996/1997
UltraMAX
FIGURE 13. —
4
3.5
3
2.5
2
1.5
) Output High Voltage - (V)
1
OUT
(V
0.5
ULTRA 9-CHANNEL SCSI TERMINATOR
OUTPUT HIGH VOLTAGE
vs. TERMINATION VOLTAGE
P RODUCTION DATA SHEET
CHARACTERISTIC CURVES
FIGURE 14. — OUTPUT CURRENT vs. TERMINATION VOLTAGE
25
20
15
10
) Output High Voltage - (V)
5
OUT
(V
LX5219
0
3
3.5 4
(V
) Termination Voltage - (V)
TERM
4.5
55.56
0
3
3.5 4
(V
) Termination Voltage - (V)
TERM
4.5
55.56
Copyright © 1998
Rev. 1.8 3/98
11
Page 12
PRODUCT DATABOOK 1996/1997
LX5219
24
23.5
23
22.5
Io (mA)
22
21.5
21
UltraMAX
ULTRA 9-CHANNEL SCSI TERMINATOR
RODUCTION DATA SHEET
P
CHARACTERISTIC CURVES
FIGURE 15. —
1
2
3
4
5
6
7
OUTPUT CURRENT CHANNEL TO CHANNEL MATCHING
8
9
10
11
12
13
14
15
16
17
18
19
Part #
20
21
22
23
APPLICATION SCHEMATIC
FIGURE 16 — 8-BIT SCSI SYSTEM APPLICATION
23.5 - 24
23 - 23.5
22.5 - 23
22 - 22.5
21.5 - 22
21 - 21.5
i8
i6
i4
Channel
i2
i0
24
25
5V
2.2µF
TERM POWER
V
TERM
LX5219
DISCONNECT
TERMPWR
V
TERM
TERMPWR TERMPWR
DISCONNECT
Note: Add third LX5219 for 16-bit SCSI
PRODUCTION DATA - Information contained in this document is proprietary to Linfinity, 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.
~
DB (0)
~
DB (1)
~
DB (6)
~
DB (7)
~
DB (P)
~
ATN
~
BSY
~
ACK
~
RST
~
MSG
HOST
PERIPHERAL
SCSI CABLE
UltraMAX is a trademark of Linfinity Microelectronics Inc.
DB (0)
DB (1)
DB (6)
DB (7)
DB (P)
ATN
BSY
ACK
RST
MSG
TERM POWER
V
TERM
LX5219
V
TERM
LX5219LX5219
5V
2.2µF
DISCONNECTDISCONNECT
TERMPWR
12
Copyright © 1998
Rev. 1.8 3/98
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