UCC5630A
ELECTRICAL CHARACTERISTICS
Unless otherwise stated, these specifications apply for T
A
= T
J
= 0°C to 70°C,
TRMPWR = 2.7V to 5.25V.
PARAMETER
Master/Slave (MSTR/SLV) Input Section
MSTR/SLV Threshold
V
TRMPWR
= 2.7V
V
TRMPWR
= 3.3V
V
TRMPWR
= 5.25V
MSTR/SLV Input Current
Status Bits (SE, LVD, HIPD) Output Section
I
SOURCE
I
SINK
V
LOAD
= 2.4V
V
LOAD
= 0.5V
V
LOAD
= 0.4V
3
2
–8.7
6
5
–4
mA
mA
mA
0.8
1
1.5
–1
1.9
2.4
3.7
1
V
V
V
A
TEST CONDITIONS
MIN
TYP
MAX UNITS
Note 1:
V
CM
is applied to all L+ and L– lines simultaneously.
Note 2:
V
L–
is applied to all L– lines simultaneously.
Note 3:
Z
CM
=
(
2 . 0
V
−
0. 5
V
)
I
(
at V
CM
L X
)
=
2
V
)
−
I
(
at V
CM
=
0 . 5
V
)
;
Note 4:
Ensured by design. Not 100% tested in production.
Note 5:
Z
=
(
V
(
−
0 . 2
V
I
L
(
X
)
)
; where
VL
(X)
= Output voltage for each terminator minus output pin (L1– through L9–) with each pin unloaded.
IL
(X )
= Output current for each terminator minus output pin (L1– through L9–) with the minus output pin forced to 0.2V.
PIN DESCRIPTIONS
DIFFB:
Input pin for the comparators that select SE,
LVD, or HIPD modes of operation. This pin should be de-
coupled with a 4.7 F capacitor to ground and then cou-
pled to the DIFSENS pin through a 50k 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.
HIPD:
TTL compatible status bit. This output pin is high
when a high voltage differential device is detected on the
bus.
HS/GND:
Heat sink ground pins. These should be con-
nected to large 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.
MSTR/SLV:
If the terminator is enabled, this input pin en-
ables / disables the DIFSENS driver, when connected to
TRMPWR or ground respectively. When the terminator is
disabled, the DIFSENS driver is off, independent of this
input.
LVD:
TTL compatible status bit. This output pin is high
when the SCSI bus is in LVD mode.
REG:
Regulator output bypass pin. This pin must be
connected to a 4.7 F capacitor to ground.
SE:
TTL compatible status bit. This output pin is high
when the SCSI bus is in SE mode.
TRMPWR:
2.7V to 5.25V power input pin, bypass near
the terminators with a 4.7 F capacitor to ground.
4
TI [ TEXAS INSTRUMENTS ]
