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PDF LX5247 Data sheet ( Hoja de datos )
| Número de pieza | LX5247 | |
| Descripción | 9 - LINE LVD SCSI TERMINATO | |
| Fabricantes | Microsemi Corporation | |
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T H E I N F I N I T E P O W E R O F I N N O VAT I O N
UltraMAXTM
LX5245/5246/5247
9-LINE LVD SCSI TERMINATOR
PRELIMINARY DATA SHEET
DESCRIPTION
The LX5245/5246/5247 ICs are Low Volt-
age Differential (LVD) Terminators de-
signed 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 termina-
tors 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 band-
width drivers also maximize channel sepa-
ration and reduces channel-to-channel noise
and cross talk. The high-bandwidth
UltraMAX architecture insures ULTRA-2 per-
formance, 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 con-
nected 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.
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
BUS VOLTAGE1
PRODUCT HIGHLIGHT
KEY FEATURES
s 2.5pF Typical Disabled Output
Capacitance
s Fast Response, No External Capacitors
Required
s 5µA 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
V OD
VOD = V(-) - V(+), Logic = 0
V(+)
100mV
NEGATED
0V
V(-) -100mV
LX5245/46/47
LX5245/46/47
Copyright © 2000
Rev. 0.6 10/00
PACKAGE ORDER INFO
TA (°C)
PW
Plastic
24-pin
TSSOP
28-PIN
0 to 70
LX5245CPW
LX5246CPW
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5245CPWT)
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
1 page  
UltraMAX
PRODUCT DATABOOK 1996/1997
LX5245/5246/5247
9-LINE LVD SCSI TERMINATOR
PRELIMINARY DATA SHEET
FUNCTIONAL PIN DESCRIPTION
Pin
Designator
Description
1-, 2-, 3-, 4-, 5-, 6-, 7-, 8-, 9-1 Negative signal termination lines.
1+, 2+, 3+, 4+, 5+, 6+, 7+, 8+, 9+ Positive signal termination lines.
VTERM
DISC1
Power supply pin for terminator. Connect to SCSI bus TERMPWR. Must be decoupled by one 4.7µF
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
cshaopratcfirtoomr isthseomdeecwohuaptlilnagyocuatpdaecpitoenrsdtaontthaenVdTEsRoMmpeinaipspalilcsoaticornitiscmala. yTbheenveafliut efroomf thheigdhe-fcroeuqpuleinngcy
decoupling with 0.1µF capacitors right at VTERM pin.
Enables / disables terminator. See Power Down Function Table for logic levels per device.
GND1
Terminator ground pin. Connect to ground.
DIFFSENSE1
Used to drive DIFFSENS output 3V @ 10 mt. Usually connected through a 20kOhm resistor to DIFF B
pin.
DIFFB1
Used to detect the SCSI BUS mode (LUD, HUD, SE)
Copyright © 2000
Rev. 0.6 10/00
5
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| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet LX5247.PDF ] | |
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