UltraMAXTM
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 H E 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
D E S C R I P T I O N
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 5µA, 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.
A R Y D A T A S H E E T
K E Y F E AT U R E S
■2.5pF Typical Disabled Output Capacitance
■Fast Response, No External Capacitors Required
■5µA Supply Current In Disconnect Mode
■20mA Supply Current During Normal Operation
■Logic Command Disconnects All Termination Lines
■Diffsense Line Driver
■Current Limit And Thermal Protection
■Compatible With The Pending SPI-2 LVD Specification
■Mention 5249 as LVD only terminator with pinout compatable with industry standard multi-mode terminators
■Pin compatable with unitrode UCC5640
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
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P R O D U C T H I G H L I G H T |
B U S V O L T A G E 1 |
V O D |
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VOD = V(-) - V(+), Logic = 0 |
V(+) |
NEGATED |
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100mV |
CM |
0V |
V |
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V(-) |
-100mV |
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LX5245/46/47 |
LX5245/46/47 |
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PA C K A G E O R D E R I N F O |
T |
(°C) |
PW |
Plastic TSSOP |
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A |
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24-pin |
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28-PIN |
0 to 70 |
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LX5245CPW |
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LX5246CPW |
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Copyright © 2000
Rev. 0.6 10/00
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5245CPWT)
L I N F I N I T Y M I C R O E L E C T R O N I C S I N C . |
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11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570 |
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
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LX5245/5246/5247 |
UltraMAX |
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9 - L I N E LV D S C S I T E R M I N A T O R |
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P R E L I M I N A R Y D A T A S H E E T |
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ABSOLUTE MAXIMUM RATINGS |
(Note 1) |
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TermPwr Voltage .............................................................................................. |
+6.5V |
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Signal Line Voltage ................................................................................... |
0V to 6.5V |
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Differential Voltage ................................................................................... |
0V to 6.5V |
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Operating Junction Temperature |
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Plastic (PW Package) ................................................................................... |
150°C |
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Storage Temperature Range .............................................................. |
-65°C to 150°C |
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Lead Temperature (Soldering, 10 seconds) .................................................... |
300°C |
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.
THERMAL DATA
PW PACKAGE:
PACKAGE PIN OUTS
LX5245/46 CPW
N.C. |
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1 |
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24 |
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VTERM |
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1+ |
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2 |
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23 |
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9- |
1- |
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3 |
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22 |
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9+ |
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2+ |
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4 |
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21 |
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8- |
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2- |
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5 |
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20 |
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8+ |
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3+ |
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6 |
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19 |
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7- |
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3- |
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7 |
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18 |
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7+ |
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4+ |
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8 |
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17 |
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6- |
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4- |
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9 |
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16 |
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6+ |
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DIFFB |
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10 |
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15 |
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5- |
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1 |
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14 |
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DIFFSENSE |
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5+ |
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12 |
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13 |
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GND |
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DISC |
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24L PW PACKAGE (Top View)
("N.C." = No Internal Connections)
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA |
100°C/W |
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA 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 |
LX5246 |
DIFFSENSE |
Outputs |
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DISCONNECT |
DISCONNECT |
Status |
Type |
Current |
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L |
H |
L < 0.5V |
Disable |
HiZ |
2mA |
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L |
H |
0.7V to 1.9V |
Enable |
LVD |
21mA |
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L |
H |
H > 2.4V |
Disable |
HiZ |
2mA |
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H |
L |
X |
Disable |
HiZ |
10µA |
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Open |
Open |
X |
Disable |
HiZ |
10µA |
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2 |
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Copyright © 2000 |
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Rev. 0.6 10/00 |
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P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
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UltraMAX |
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LX5245/5246/5247 |
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9 - L I N E LV D S C S I T E R M I N A T O R |
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P R E L I M I N A R Y D A T A S H E E T |
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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 |
(Note 2) |
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Parameter |
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Symbol |
Recommended Operating Conditions |
Units |
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Min. |
Typ. |
Max. |
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Termpwr Voltage |
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VTERM |
3.0 |
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5.25 |
V |
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Signal Line Voltage |
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0 |
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5.0 |
V |
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Disconnect Input Voltage |
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0 |
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VTERM |
V |
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Operating Junction Temperature Range |
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LX5245 / 5246/5247 |
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0 |
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70 |
°C |
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Note 2. Range over which the device is functional. |
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E L E C T R I C A L C H A R A C T E R I S T I C S
(Unless otherwise specified, these specifications apply over the operating ambient temperature range of 0°C ≤ TA ≤ 70°C. 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 |
Symbol |
Test Conditions |
LX5245 / 5246 |
Units |
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Min. |
Typ. |
Max. |
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LVD Terminator Section |
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TermPwr Supply Current |
LVD ICC |
All term lines = Open |
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21 |
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25 |
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mA |
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DISCONNECT: LX5245/47 = H, LX5246 = L |
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5 |
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10 |
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µA |
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Common Mode Voltage |
VOM |
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1.125 |
1.25 |
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1.375 |
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V |
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Offset Voltage (fail safe bias voltage) |
VOS |
Open circuit between - and + (see Note 3) |
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100 |
112 |
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125 |
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mV |
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Differential Terminator Impedance |
ZD |
VOD = -1V to 1V |
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100 |
105 |
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110 |
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Ω |
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Common Mode Impedance |
ZCM |
0V to 2.5V |
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100 |
200 |
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300 |
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Ω |
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Output Capacitance |
Co |
DISCONNECT: LX5245/47 = H, LX5246 = L |
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2.5 |
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pF |
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Output Leakage |
ILeak |
DISCONNECT: LX5245/47 = H, LX5246 = L, VLINE = 0 to 4V, TA=25°C |
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0 |
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2 |
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µA |
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DISCONNECT: LX5245/47 = H, LX5246 = L, VTERM = 0V, VLINE = 2.7V |
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1 |
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µA |
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Mode Change Delay |
tDF |
DIFFSENSE = 1.4V to 0V |
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100 |
150 |
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ms |
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DIFFSENSE Section |
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DIFFSENSE Output Voltage |
VDIFF |
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1.2 |
1.3 |
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1.4 |
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V |
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DIFFSENSE Output Source Current |
IDIFF |
DIFFSENSE = 0V |
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5.0 |
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15.0 |
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mA |
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DIFFSENSE Sink Current |
ISINK(DIFF) |
VIN = 2.75V |
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200 |
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µA |
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DIFFSENSE Output Leakage |
ILEAK(DIFF) |
DISCONNECT: LX5245/47 = H, LX5246 = L, TA = 25°C |
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10 |
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µA |
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DISCONNECT Section |
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DISCONNECT Threshold |
VTH |
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0.8 |
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2.0 |
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V |
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Input Current |
IIH |
DISCONNECT: LX5245/47 = 0V |
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10 |
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µA |
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DISCONNECT: LX5246 = 3.3V |
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10 |
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µA |
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Note 3. Open circuit failsafe voltage.
Copyright © 2000 |
3 |
Rev. 0.6 10/00 |
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