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LIN D O C #: 5219
UltraMAX
T
HE
TM
LX5219
D
ATA
U LT R A 9 - CHANNEL S C S I TE R M I N ATOR
I
NFINITE
P
OWER
OF
I
N N O VAT I O N
P
RODUCTION
S
HEET
DESCRIPTION
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 controlled 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 (275A) 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 20F 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.
K E Y F E AT U R E S
s ULTRA-FAST RESPONSE FOR FAST-20 SCSI APPLICATIONS s HOT SWAP COMPATIBLE s 35MHz CHANNEL BANDWIDTH s 3.5V OPERATION s LESS THAN 3pF OUTPUT CAPACITANCE s SLEEP-MODE CURRENT LESS THAN 275A s THERMALLY SELF LIMITING s NO EXTERNAL COMPENSATION CAPACITORS s IMPLEMENTS 8-BIT OR 16-BIT (WIDE) APPLICATIONS s COMPATIBLE WITH ACTIVE NEGATION DRIVERS (60mA / CHANNEL) s COMPATIBLE WITH PASSIVE AND ACTIVE TERMINATIONS s APPROVED FOR USE WITH SCSI 1, 2, 3 AND ULTRASCSI s CONSULT FACTORY FOR APPLICATION TEST REPORT s EVALUATION BOARD AVAILABLE
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 HZ
D R I V I N G WAV E F O R M - 2 0 M HZ
Receiver 1 Meter, AWG 28 LX5219 LX5268
Driver LX5219 LX5268
PA C K A G E O R D E R I N F O R M AT I O N TJ (C) 0 to 70
DW Plastic SOWB 16-pin
LX5219CDW
PW Plastic TSSOP 20-pin
LX5219CPW
NOTE: For An In-Depth Discussion On Applying SCSI, Request Linfinity Application Note: "Understanding The Single-Ended SCSI Bus"
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX5219CDWT)
Copyright (c) 1998 Rev. 1.8 3/98
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
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LX5219
U LT R A 9 - CHANNEL S C S I TE R M I N ATOR
P
RODUCTION
UltraMAX
D
ATA
S
HEET
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 N.C. D0 D1 D2 D3 D4 GND
1 2 3 4 5 6 7 8 16 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 ........................................................... 0C to 125C Storage Temperature Range ............................................................. -65C to +150C Solder Temperature (Soldering, 10 seconds) ................................................... 300C
Note 1. Exceeding these ratings could cause damage to the device.
TERM POWER N.C. DISABLE D8 D7 D6 D5 GND
T H E R M A L D ATA
DW PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA PW PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA 95C/W 144C/W
TERM POWER N.C. N.C. D0 D1 D2 D3 D4 N.C. GND
DW PACKAGE (Top View)
20 2 3 4 5 6 7 8 9 10 19 18 17 16 15 14 13 12 11
Junction Temperature Calculation: TJ = TA + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow.
TERM POWER DISABLE N.C. D8 D7 N.C. D6 D5 N.C. GND
PW PACKAGE (Top View)
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Copyright (c) 1998 Rev. 1.8 3/98
P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7
UltraMAX
U LT R A 9 - CHANNEL S C S I TE R M I N ATOR
P
RODUCTION
LX5219
D
ATA
S
HEET
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 Disable Input Voltage Low Level Disable Input Voltage Operating Virtual Junction Temperature Range LX5219C Note 2. Range over which the device is functional.
(Note 2)
Symbol
VTERM VIH VIL
Recommended Operating Conditions Min. Typ. Max.
3.5 2 0 0 5.5 VTERM 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 temperature of TA = 25C. 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
VOUT ICC
Test Conditions
Min.
2.65
LX5219 Typ. Max.
2.85 6 215 375 -23 10 -90 10 3 35 60 9 225 -24
Units
V mA mA A mA nA A nA pF MHz mA
Output Current Disable Input Current Output Leakage Current Capacitance in Disabled Mode Channel Bandwidth Termination Sink Current, per Channel
IOUT
COUT BW I SINK
All data lines = open All data lines = 0.5V Disable Pin < 0.8V VOUT = 0.5V Disable Pin = 4.75V Disable Pin = 0V Disable Pin = < 0.8V, VO = 0.5V VOUT = 0V, frequency = 1MHz VOUT = 4V
-21
Copyright (c) 1998 Rev. 1.8 3/98
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LX5219
U LT R A 9 - CHANNEL S C S I TE R M I N ATOR
P
RODUCTION
UltraMAX
D
ATA
S
HEET
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
Cable transmission theory suggests to optimize signal speed by delivering 24mA on assertion and by imposing 2.85V on and quality, the termination should act both as an ideal voltage deassertion. In order to disable the device, the Disable pin reference when the line is released (deasserted) and as an must be driven logic Low. This mode of operation places ideal current source when the line is active (asserted). the device in a sleep state where a meager 275A of quiescent Common active terminators, which consist of Linear Regulators current is consumed. Additionally, all outputs are in a Hi-Z in series with resistors (typically (impedance) state. Sleep mode can POWER UP / POWER DOWN FUNCTION TABLE 110), are a compromise. As the be used for power conservation or line voltage increases, the amount to completely eliminate the termiDisable Quiescent Outputs of current decreases linearly by the nator from the SCSI chain. In the (LX5219) Current equation V = I * R. The LX5219, second case, termination node cawith its unique new architecture pacitance is important to consider. H Enabled 6mA applies the maximum amount of The terminator will appear as a L HI Z 275A current regardless of line voltage parasitic distributed capacitance on Open Enabled 6mA until the termination high threshthe line, which can detract from bus old (2.85V) is reached. performance. For this reason, the Acting as a near ideal line terminator, the LX5219 closely LX5219 has been optimized to have only 3pF of capacitance reproduces the optimum case when the device is enabled. per output in the sleep state. To enable the device the Disable Pin must be pulled logic An additional feature of the LX5219 is its compatibility with High or left Open. During this mode of operation, quiescent active negation drivers. The device handles up to 60mA of current is 6mA and the device will respond to line demands sink current for drivers which exceed the 2.85V output high.
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Copyright (c) 1998 Rev. 1.8 3/98
P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7
UltraMAX
U LT R A 9 - CHANNEL S C S I TE R M I N ATOR
P
RODUCTION
LX5219
D
ATA
S
HEET
GRAPH / CURVE INDEX
FIGURE INDEX
Waveforms
FIGURE # 1A. RECEIVING WAVEFORM (Freq. = 1.0MHz) 1B. DRIVING WAVEFORM 2A. RECEIVING WAVEFORM (Freq. = 5.0MHz) 2B. DRIVING WAVEFORM 3. 4. 10MHz WAVEFORM 20MHz WAVEFORM FIGURE #
Application Circuits
16. 8-BIT SCSI SYSTEM APPLICATION
Characteristic Curves
FIGURE # 5. 6. 7. 8. 9. OUTPUT HIGH VOLTAGE vs. JUNCTION TEMPERATURE OUTPUT CURRENT vs. JUNCTION TEMPERATURE OUTPUT CURRENT vs. OUTPUT HIGH VOLTAGE (VT = 4.75V) OUTPUT CURRENT vs. OUTPUT HIGH VOLTAGE (VT = 3.3V) TERMINATION VOLTAGE vs. SUPPLY CURRENT
10. TERMPWR SUPPLY CURRENT vs. TERMINATION VOLTAGE (Disabled) -- LX5219 11. OUTPUT HIGH VOLTAGE vs. JUNCTION TEMPERATURE (VT = 3.3V) 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
Copyright (c) 1998 Rev. 1.8 3/98
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LX5219
U LT R A 9 - CHANNEL S C S I TE R M I N ATOR
P
RODUCTION
UltraMAX
D
ATA
S
HEET
CHARACTERISTIC
CURVES
FIGURE 1A. -- RECEIVING WAVEFORM
3.5
FIGURE 1B. -- DRIVING WAVEFORM
3.5
freq.=1.03844MHz
3 2.5 3 2.5
freq.=1.00266MHz
Line Voltage - (V)
2 1.5 1 0.5 GND -0.5
Line Voltage - (V)
Time - (250ns/Div.)
END-DRIVEN CABLE
2 1.5 1 0.5 GND -0.5
Time - (250ns/Div.)
Receiver Fig. 1A 6 Meter, 92 LX5219 75C08
Driver Fig. 1B LX5219 75C08
6
Copyright (c) 1998 Rev. 1.8 3/98
P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7
UltraMAX
U LT R A 9 - CHANNEL S C S I TE R M I N ATOR
P
RODUCTION
LX5219
D
ATA
S
HEET
CHARACTERISTIC
CURVES
FIGURE 2A. -- RECEIVING WAVEFORM
3.5
FIGURE 2B. -- DRIVING WAVEFORM
3.5
freq.=5.0092MHz
3 2.5
3 2.5
freq.=4.9961MHz
Line Voltage - (V)
Line Voltage - (V)
2 1.5 1 0.5 GND -0.5
2 1.5 1 0.5 GND -0.5
Time - (50ns/Div.)
END-DRIVEN CABLE
Time - (50ns/Div.)
Receiver Fig. 2A 6 Meter, 92 LX5219 75C08
Driver Fig. 2B LX5219 75C08
Copyright (c) 1998 Rev. 1.8 3/98
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LX5219
U LT R A 9 - CHANNEL S C S I TE R M I N ATOR
P
RODUCTION
UltraMAX
D
ATA
S
HEET
CHARACTERISTIC
CURVES
FIGURE 3. -- 10MHz WAVEFORM
4 Ch2 Freq.=10.096MHz 3 2
FIGURE 4. -- 20MHz WAVEFORM
4 Ch2 Freq.=20.020MHz 3 2
#1
#2
Line Voltage - (V)
Line Voltage - (V)
#2
1
1 0 4
#1
0
#3
4
#3
GND
GND
Time - (20ns/Div.)
END-DRIVEN CABLE
Time - (10ns/Div.)
4.75V
LX5219
1
6 Meter, 72
2
4.75V
LX5219
LX5268
LX5268
3
8
Copyright (c) 1998 Rev. 1.8 3/98
P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7
UltraMAX
U LT R A 9 - CHANNEL S C S I TE R M I N ATOR
P
RODUCTION
LX5219
D
ATA
S
HEET
CHARACTERISTIC
CURVES
FIGURE 5. -- OUTPUT HIGH VOLTAGE vs. JUNCTION TEMP.
4.5
FIGURE 6. -- OUTPUT CURRENT vs. JUNCTION TEMP.
30
(VOUT) Output High Voltage - (V)
3.5
(IOUT) Output Current - (mA)
4
25
20
3
15
2.5
10
VT = 4.75V
2 0 25 50 75 100 125 5 0 25 50 75 100 125
(TJ) Junction Temperature - (C)
(TJ) Junction Temperature - (C)
FIGURE 7. -- OUTPUT CURRENT vs. OUTPUT HIGH VOLTAGE
25
FIGURE 8. -- OUTPUT CURRENT vs. OUTPUT HIGH VOLTAGE
25
VT = 4.75V TA = 25C
VT = 3.3V TA = 25C
(IOUT) Output Current - (mA)
15
(IOUT) Output Current - (mA)
0.4
20
20
15
10
10
5
5
0 0 0.8 1.2 1.6 2 2.4 2.8 3.2
0 0 0.4 0.8 1.2 1.6 2 2.4 2.8 3.2
(VOUT) Output High Voltage - (V)
(VOUT) Output High Voltage - (V)
Copyright (c) 1998 Rev. 1.8 3/98
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LX5219
U LT R A 9 - CHANNEL S C S I TE R M I N ATOR
P
RODUCTION
UltraMAX
D
ATA
S
HEET
CHARACTERISTIC
CURVES
FIGURE 9. -- TERMPWR SUPPLY CURRENT
vs. TERMINATION VOLTAGE
7
FIGURE 10. -- LX5219 TERMPWR SUPPLY CURRENT
500
vs. TERMINATION VOLTAGE (Disabled)
(ICC) TermPwr Supply Current - (mA)
6
(ICC) TermPwr Supply Current - (A)
3 3.5 4 4.5 5 5.5 6
450 400 350 300 250 200 150 100 50 0 0 1 2 3 4 5 6
5
4
3
2 1
0 2.5
(VTERM) Termination Voltage - (V)
(VTERM) Termination Voltage - (V)
FIGURE 11. -- OUTPUT HIGH VOLTAGE vs. JUNCTION TEMP.
4.5
FIGURE 12. -- OUTPUT CURRENT vs. JUNCTION TEMP.
30
VT = 3.3V
VT = 3.3V
(VOUT) Output High Voltage - (V)
(IOUT) Output Current - (mA)
4
25
3.5
20
3
15
2.5
10
2 0 25 50 75 100 125
5 0 25 50 75 100 125
(TJ) Junction Temperature - (C)
(TJ) Junction Temperature - (C)
10
Copyright (c) 1998 Rev. 1.8 3/98
P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7
UltraMAX
U LT R A 9 - CHANNEL S C S I TE R M I N ATOR
P
RODUCTION
LX5219
D
ATA
S
HEET
CHARACTERISTIC
CURVES
FIGURE 13. -- OUTPUT HIGH VOLTAGE
vs. TERMINATION VOLTAGE
4 3.5 3 2.5 2 1.5 1 0.5 0 3 3.5 4 4.5 5 5.5 6
FIGURE 14. -- OUTPUT CURRENT vs. TERMINATION VOLTAGE
25
(VOUT) Output High Voltage - (V)
(VOUT) Output High Voltage - (V)
20
15
10
5
0 3 3.5 4 4.5 5 5.5 6
(VTERM) Termination Voltage - (V)
(VTERM) Termination Voltage - (V)
Copyright (c) 1998 Rev. 1.8 3/98
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LX5219
U LT R A 9 - CHANNEL S C S I TE R M I N ATOR
P
RODUCTION
UltraMAX
D
ATA
S
HEET
CHARACTERISTIC
CURVES
FIGURE 15. -- OUTPUT CURRENT CHANNEL TO CHANNEL MATCHING
24
23.5
23
Io (mA)
22.5
22
23.5 - 24 23 - 23.5 22.5 - 23 22 - 22.5 21.5 - 22 21 - 21.5
21.5 i6 21 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 i0 Part # 21 22 23 24 25 i2 i4
i8
Channel
A P P L I C A T I O N S C H E M AT I C
FIGURE 16 -- 8-BIT SCSI SYSTEM APPLICATION
5V
2.2F
TERM POWER
VTERM
HOST
PERIPHERAL
TERM POWER
VTERM
2.2F
5V
DISCONNECT
LX5219
LX5219
DB (6) DB (7) DB (P)
DB (6) DB (7) DB (P)
TERMPWR
VTERM
TERMPWR ATN BSY ACK RST MSG
~~
~~~
TERMPWR
VTERM
TERMPWR
DISCONNECT
Copyright (c) 1998 Rev. 1.8 3/98
DISCONNECT
LX5219
~~~
SCSI CABLE
ATN BSY ACK RST MSG
LX5219
Note: Add third LX5219 for 16-bit SCSI
UltraMAX is a trademark of Linfinity Microelectronics Inc.
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.
12
DISCONNECT
DB (0) DB (1)
~~
DB (0) DB (1)

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