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UltraMAX
TM
LX5245/5246/5247
9 - L I N E LV D S C S I T E R M I N A T O R
T
HE
I
NFINITE
P
OWER
OF
I
N N O VAT I O N
P
RELIMINARY
D
ATA
S
HEET
DESCRIPTION
The LX5245/5246/5247 ICs are Low Voltage Differential (LVD) Terminators designed to comply with the LVD termination specification in the SPI-2 document. The LX5245/5246/5247 are designed specifically for LVD applications. Because the LX5245/ 5246/5247 support only LVD, they have lower output capacitance than multimode terminators such as the LX5240. The LX5245/5246/5247 Utilize Linfinity's UltraMAX Technology which delivers the ultimate in SCSI bus performance while saving component cost and board area. Elimination of the external capacitors also mitigates the need for a lengthy capacitor selection process. The individual high bandwidth drivers also maximize channel separation and reduces channel-to-channel noise and cross talk. The high-bandwidth UltraMAX architecture insures ULTRA-2 performance, while providing a clear migration path to ULTRA-3 and beyond. When The LX5245/5246/5247 Are Enabled, The Differential Sense (DIFFSENSE) Pin Supplies A Voltage Between 1.2V And 1.4V. In application, the terminator DIFFSENSE output is connected to the system DIFFSENSE line. If there are no single ended or HVD devices attached to the system the LVD output will be enabled. If the DIFFSENSE line is LOW, indicating a single ended device, the LX5245/ 5246/5247 output will be HiZ. If the DIFFSENSE line is HIGH, indicating a high voltage differential device the LX5245/5246/ 5247 output will be HiZ. The LX5245/5246/5247 ICs Have A TTL Compatible DISCONNECT Pin. The LX5245/47 is active LOW and the LX5246 is active HIGH. During sleep mode, power dissipation is reduced to a meager 5A, while also placing all outputs in a HI Z state. Also during sleep mode, the DIFFSENSE function is disabled and is placed in a HI Z state.
K E Y F E AT U R E S
s 2.5pF Typical Disabled Output Capacitance s Fast Response, No External Capacitors Required s 5A Supply Current In Disconnect Mode s 20mA Supply Current During Normal Operation s Logic Command Disconnects All Termination Lines s Diffsense Line Driver s Current Limit And Thermal Protection s Compatible With The Pending SPI-2 LVD Specification s Mention 5249 as LVD only terminator with pinout compatable with industry standard multi-mode terminators s Pin compatable with unitrode UCC5640
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
B U S V O LTA G E 1
V OD
VOD = V(-) - V(+), Logic = 0
V(+)
100mV 0V
NEGATED
VCM
V(-)
-100mV
LX5245/46/47
LX5245/46/47
PA C K A G E O R D E R I N F O TA (C)
PW Plastic TSSOP
24-pin 28-PIN
LX5245CPW LX5246CPW
0 to 70
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX5245CPWT)
Copyright (c) 2000 Rev. 0.6 10/00
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
LX5245/5246/5247
9 - L I N E LV D S C S I T E R M I N A T O R
P
RELIMINARY
UltraMAX
D
ATA
S
HEET PACKAGE PIN OUTS
A B S O L U T E M A X I M U M R AT I N G S
(Note 1)
TermPwr Voltage .............................................................................................. +6.5V Signal Line Voltage ................................................................................... 0V to 6.5V Differential Voltage ................................................................................... 0V to 6.5V Operating Junction Temperature Plastic (PW Package) ................................................................................... 150C Storage Temperature Range .............................................................. -65C to 150C Lead Temperature (Soldering, 10 seconds) .................................................... 300C
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.
LX5245/46 CPW
N.C. 1+ 12+ 23+ 34+ 4DIFFB DIFFSENSE GND
1 2 3 4 5 6 7 8 9 10 1 12 1 24 23 22 21 20 19 18 17 16 15 14 13
VTERM 99+ 88+ 77+ 66+ 55+ DISC
T H E R M A L D ATA
PW PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA 100C/W
24L PW PACKAGE (Top View) ("N.C." = No Internal Connections)
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.
DIFFSENSE / POWER UP / POWER DOWN FUNCTION TABLE
LX5245/LX5247 DISCONNECT L L L H Open LX5246 DISCONNECT H H H L Open DIFFSENSE L < 0.5V 0.7V to 1.9V H > 2.4V X X Outputs Status Type Disable Enable Disable Disable Disable HiZ LVD HiZ HiZ HiZ Quiescent Current 2mA 21mA 2mA 10A 10A
2
Copyright (c) 2000 Rev. 0.6 10/00
PRODUCT DATABOOK 1996/1997
UltraMAX
9 - L I N E LV D S C S I T E R M I N A T O R
P
RELIMINARY
LX5245/5246/5247
D
ATA
S
HEET
(Note 2)
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
Termpwr Voltage Signal Line Voltage Disconnect Input Voltage Operating Junction Temperature Range LX5245 / 5246/5247 Note 2. Range over which the device is functional.
Symbol
VTERM
Recommended Operating Conditions Min. Typ. Max.
3.0 0 0 0 5.25 5.0 VTERM 70
Units
V V V C
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperature range of 0C TA 70C. TermPwr = 3.3V, DISCONNECT: LX5245/47 = L, LX5246 = H. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
Parameter LVD Terminator Section
TermPwr Supply Current Common Mode Voltage Offset Voltage (fail safe bias voltage) Differential Terminator Impedance Common Mode Impedance Output Capacitance Output Leakage Mode Change Delay
Symbol
Test Conditions
LX5245 / 5246 Min. Typ. Max.
21 5 1.125 1.25 100 112 100 105 100 200 2.5 0 1 100 150 1.2 5.0 1.3
Units
LVD ICC VOM VOS ZD ZCM Co ILeak tDF VDIFF IDIFF ISINK(DIFF) ILEAK(DIFF) VTH IIH
All term lines = Open DISCONNECT: LX5245/47 = H, LX5246 = L Open circuit between - and + (see Note 3) VOD = -1V to 1V 0V to 2.5V DISCONNECT: LX5245/47 = H, LX5246 = L DISCONNECT: LX5245/47 = H, LX5246 = L, VLINE = 0 to 4V, TA=25C DISCONNECT: LX5245/47 = H, LX5246 = L, VTERM = 0V, VLINE = 2.7V DIFFSENSE = 1.4V to 0V
25 mA 10 A 1.375 V 125 mV 110 300 pF 2 A A ms 1.4 15.0 200 10 2.0 10 10 V mA A A V A A
DIFFSENSE Section
DIFFSENSE Output Voltage DIFFSENSE Output Source Current DIFFSENSE Sink Current DIFFSENSE Output Leakage DIFFSENSE = 0V VIN = 2.75V DISCONNECT: LX5245/47 = H, LX5246 = L, TA = 25C
DISCONNECT Section
DISCONNECT Threshold Input Current Note 3. Open circuit failsafe voltage. 0.8 DISCONNECT: LX5245/47 = 0V DISCONNECT: LX5246 = 3.3V
Copyright (c) 2000 Rev. 0.6 10/00
3
PRODUCT DATABOOK 1996/1997
LX5245/5246/5247
9 - L I N E LV D S C S I T E R M I N A T O R
P
RELIMINARY
UltraMAX
D
ATA
S
HEET
BLOCK DIAGRAM
Power ON
VTERMPWR DISC
Internal VREF 1.30V
1.07mA
1 of 9
HVD LVD 2D(-) 52.5 SE
LVD (-)
LVD 1.25V
2cm 200
2D(+) 52.5
HVD LVD
LVD (+)
10mA
SE
DIFFSENSE
1.07mA
HVD
LATCH LVD
DIFF B
Window Comp. SE
Power ON
Power ON & Mode Change Delay
FIGURE 1 -- LX5245 Block Diagram
4
Copyright (c) 2000 Rev. 0.6 10/00
PRODUCT DATABOOK 1996/1997
UltraMAX
9 - L I N E LV D S C S I T E R M I N A T O R
P
RELIMINARY
LX5245/5246/5247
D
ATA
S
HEET
FUNCTIONAL PIN DESCRIPTION
Pin Designator
1-, 2-, 3-, 4-, 5-, 6-, 7-, 8-, 9-1 VTERM
Description
Negative signal termination lines. Power supply pin for terminator. Connect to SCSI bus TERMPWR. Must be decoupled by one 4.7F low-ESR capacitor for every three terminator devices. It is absolutely necessary to connect this pin to the decoupling capacitor through a very low impedance (big traces on PCB). Keeping distances very short from the decoupling capacitors to the VTERM pin is also critical. The value of the decoupling capacitor is somewhat layout dependant and some applications may benefit from high-frequency decoupling with 0.1F capacitors right at VTERM pin. Enables / disables terminator. See Power Down Function Table for logic levels per device. Terminator ground pin. Connect to ground. Used to drive DIFFSENS output 3V @ 10 mt. Usually connected through a 20kOhm resistor to DIFF B pin. Used to detect the SCSI BUS mode (LUD, HUD, SE)
1+, 2+, 3+, 4+, 5+, 6+, 7+, 8+, 9+ Positive signal termination lines.
DISC1 GND1 DIFFSENSE1 DIFFB1
Copyright (c) 2000 Rev. 0.6 10/00
5
PRODUCT DATABOOK 1996/1997
LX5245/5246/5247
9 - L I N E LV D S C S I T E R M I N A T O R
P
RELIMINARY
UltraMAX
D
ATA
S
HEET
A P P L I C AT I O N S C H E M AT I C
TERM POW ER
V
HOST
TERM
P E R IP H E R A L
11+ 1V 1+
TERM
TERM POW ER
D IS C O N N E C T
LX5245 LX5246 LX5247
D IS C O N N E C T M /S GND
D a ta L in e s ( 9 )
99+ 99+
LX5245 LX5246 LX5247
D IS C O N N E C T
D IS C O N N E C T
D IF F S E N S E D IF F B *
D IF F S E N S E D IF F B *
M /S GND
V 4 .7 F
TERM
LX5245 LX5246 LX5247
D IS C O N N E C T M /S GND
11+
1V 1+
TERM
D a ta L in e s ( 9 )
99+ 99+
LX5245 LX5246 LX5247
D IS C O N N E C T M /S GND
4 .7 F
D IF F S E N S E D IF F B *
D IF F S E N S E D IF F B *
V
TERM
LX5245 LX5246 LX5247
D IS C O N N E C T M /S GND
11+
11+
V
TERM
C o n tr o l L in e s ( 9 )
99+ 99+
LX5245 LX5246 LX5247
D IS C O N N E C T M /S GND
D IF F S E N S E D IF F B *
D IF F S E N S E D IF F B *
FIGURE 2 -- Linfinity ONLY Application Schematic
6
Copyright (c) 2000 Rev. 0.6 10/00
PRODUCT DATABOOK 1996/1997
UltraMAX
9 - L I N E LV D S C S I T E R M I N A T O R
P
RELIMINARY
LX5245/5246/5247
D
ATA
S
HEET
A P P L I C AT I O N S C H E M AT I C
TERM POW ER
V
HOST
TERM
P E R IP H E R A L
11+ 11+ V
TERM
TERM POW ER
LX5245 LX5246 LX5247
D IS C O N N E C T
D IS C O N N E C T
D a ta L in e s ( 9 )
99+ 99+
LX5245 LX5246 LX5247
D IS C O N N E C T
D IS C O N N E C T
D IF F S E N S E GND N .C .* P in 1 D IF F B
20k 0 .1 F
20k 0 .1 F
D IF F S E N S E D IF F B GND N .C .* P in 1
4 .7 F *
4 .7 F *
V
TERM
4 .7 F
LX5245 LX5246 LX5247
D IS C O N N E C T GND
11+
11+
V
TERM
D a ta L in e s ( 9 )
99+ 99+
LX5245 LX5246 LX5247
D IS C O N N E C T
4 .7 F
D IF F S E N S E D IF F B
D IF F S E N S E D IF F B GND N .C .* P in 1
N .C .* P in 1
4 .7 F *
4 .7 F *
V
TERM
LX5245 LX5246 LX5247
D IS C O N N E C T GND
11+
11+
V
TERM
C o n tr o l L in e s ( 9 )
99+ 99+
LX5245 LX5246 LX5247
D IS C O N N E C T
D IF F S E N S E D IF F B
D IF F S E N S E D IF F B GND N .C .* P in 1
N .C .* P in 1
4 .7 F *
4 .7 F *
* T h e c a p a c ito r o n P in 1 c a n b e p la c e d o n th e L X 5 2 4 5 C P W , L X 5 2 4 6 C P W
o r th e L X 5 2 4 7 C P W
to b e p in - c o m p a tib le w ith o th e r d e v ic e s . T h is V
REG
/R E F c a p a c ito r is n o t r e q u ir e d .
FIGURE 3 -- Suggested Linfinity LX5245/5246/5247 Universal Application Schematic (Please Reference Manufacturer's Current Data Sheet To Ensure Compatibility)
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.
Copyright (c) 2000 Rev. 0.6 10/'00
7

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