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UCC5672 Datasheet(PDF) 4 Page - Texas Instruments

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Part No. UCC5672
Description  Multimode LVD/SE SCSI 9 Line Terminator
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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UCC5672 Datasheet(HTML) 4 Page - Texas Instruments

   
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UCC5672
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for TA =TJ = 0°C to 70°C,
TRMPWR = 2.7V to 5.25V.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Time Delay/Filter Section
Mode Change Delay
A new mode change can start any time after a
previous mode change has been detected.
(Note4 )
100
180
300
ms
Note 1: Guaranteed by design. Not 100% tested in production.
Note 2:
() ()
Z
V
II
CM
VV
VV
CM
CM
=
+−
12
06
06
.
..
; 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.
PIN DESCRIPTIONS
DIFFB:
Input pin for the comparators that select SE,
LVD SCSI, or HIPD modes of operation. This pin should
be decoupled with a 0.1
µF capacitor to ground and then
coupled 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 activate the terminator or
open pin to disable 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
SCSI mode. In HIPD mode, these lines are high imped-
ance.
L1+ thru L9+: Termination lines. These lines switch to
ground in SE mode and are the positive lines for LVD
SCSI mode. In HIPD mode, these lines are high imped-
ance.
REG: Regulator bypass pin, must be connected to a
4.7 F capacitor to ground.
TRMPWR: 2.7V to 5.25V power input pin. Bypass near
the terminators with a 4.7 F capacitor to ground.
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 UCC5672 is used in multi-mode active termination
applications, where single ended (SE) and low voltage
differential (LVD) SCSI devices might coexist. The
UCC5672 has both SE and LVD SCSI termination net-
works integrated into a single monolithic component. The
correct termination 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 UCC5672 DIFSENS drivers will try to de-
liver 1.3V to the DIFSENS line. If only LVD SCSI devices
are present, the DIFSENS line will be successfully driven
to 1.3V and the terminators will configure for LVD SCSI
operation. If any single ended devices are present, they
will present a short to ground on the DIFSENS line, sig-
naling the UCC5672(s) to configure into the SE mode,
accommodating the SE devices. Or, if any high voltage
differential
(HVD)
SCSI
devices
are
present,
the
DIFSENS line is pulled high and the terminator will enter
a high impedance 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-
APPLICATION INFORMATION


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