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UCC5673 Datasheet(PDF) 4 Page - Texas Instruments

Part No. UCC5673
Description  Multimode LVD/SE SCSI 9 Line Terminator
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com

UCC5673 Datasheet(HTML) 4 Page - Texas Instruments

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ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for TA =TJ = 0°C to 70°C,
TRMPWR = 2.7V to 5.25V.
Time Delay/Filter Section
Mode Change Delay
A new mode change can start any time after a
previous mode change has been detected.
(Note 4 )
Note 1: Guaranteed by design. Not 100% tested in production.
Note 2:
() ()
Where VCM = Voltage measured with L+ tied to L– and zero current applied;
Note 3: VLX= Output voltage for each terminator minus output pin (L1– through L9–) with each pin unloaded.
ILX = Output current for each terminator minus output pin (L1– through L9–) with the minus output pin forced to 0.2V.
Note 4: Noise on DIFFB will not cause a false mode change. The time delay is that same for a change from any mode to any
other mode. Within 300ms after power is applied the mode is defined by the voltage of DIFFB.
Input pin for the comparators that select SE,
LVD, or HIPD modes of operation. This pin should be de-
coupled with a 0.1
µF capacitor to ground and then cou-
pled to the DIFSENS pin through a 20k
Ω resistor.
DIFSENS: Connects to the Diff Sense line of the SCSI
bus. The bus mode is controlled by the voltage level on
this pin.
DISCNCT: Input pin used to shut down the terminator if
the terminator is not connected at the end of the bus.
Connect this pin to ground to disable the terminator or
open pin to activate the terminator.
HS/GND: Heat sink ground pins. These should be con-
nected to large ground area PC board traces to increase
the power dissipation capability.
GND: Power Supply return.
L1– thru L9–: Termination lines. These are the active
lines in SE mode and are the negative lines for LVD
mode. In HIPD mode, these lines are high impedance.
L1+ thru L9+: Termination lines. These lines switch to
ground in SE mode and are the positive lines for LVD
mode. In HIPD mode, these lines are high impedance.
TRMPWR: 2.7V to 5.25V power input pin.
All SCSI buses require a termination network at each
end to function properly. Specific termination require-
ments differ, depending on which types of SCSI devices
are present on the bus.
The UCC5673 is used in multi-mode active termination
applications, where single ended (SE) and low voltage
differential (LVD) devices might coexist. The UCC5673
has both SE and LVD termination networks integrated
into a single monolithic component. The correct termina-
tion network is automatically determined by the SCSI bus
"DIFSENS" signal.
The SCSI bus DIFSENS signal line is used to identify
which types of SCSI devices are present on the bus. On
power-up, the UCC5673 DIFSENS drivers will try to de-
liver 1.3V to the DIFSENS line. If only LVD devices are
present, the DIFSENS line will be successfully driven to
1.3V and the terminators will configure for LVD opera-
tion. If any single ended devices are present, they will
present a short to ground on the DIFSENS line, signaling
the UCC5673(s) to configure into the SE mode, accom-
modating the SE devices. Or, if any high voltage differen-
tial (HVD) devices are present, the DIFSENS line is
pulled high and the terminator will enter a high imped-
ance state, effectively disconnecting from the bus.
The DIFSENS line is monitored by each terminator
through a 50Hz noise filter at the DIFFB input pin. A set
of comparators detect and select the appropriate termi-
nation for the bus as follows. If the DIFSENS signal is be-

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