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UCC5638 Datasheet(PDF) 3 Page - Texas Instruments

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Part No. UCC5638
Description  Multimode SCSI 15 Line Terminator
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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UCC5638 Datasheet(HTML) 3 Page - Texas Instruments

   
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UCC5638
PIN DESCRIPTIONS
DIFFB: Diff sense filter pin should be connected at a
0.1 F capacitor.
DIFFSENS: The SCSI bus Diff Sense line to detect what
types of devices are connected to the SCSI bus.
DISCNCT: Disconnect pin shuts down the terminator
when it is not at the end of the bus. The disconnect pin
low enables the terminator.
Note: In Disconnect Mode, the comparitor set powers down for
low idle current.
LINE
n–: Signal line active line for single ended or nega-
tive line in differential applications for the SCSI bus.
LINE
n+: Ground line for single ended or positive line for
differential applications for the SCSI bus.
REG: Regulator bypass pin, must be connected to a
F capacitor.
TRMPWR: VIN 2.7V to 5.25V supply, bypass near the
terminator with a 4.7
µF capacitor to ground.
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for TA =TJ = 0°C to 70°C,
TRMPWR = 3.3V.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Single Ended Termination Section
Impedance
Z
VL
V
IL
X
X
=
(.
)
02
, (Note 3)
102.3
110
117.7
Termination Current
Signal Level 0.2V, All Lines Low
–21
–24
–25.4
mA
Signal Level 0.5V
–18
–22.4
mA
Output Leakage
400
nA
Output Capacitance
Single Ended Measurement to Ground (Note 1)
3
pF
Single Ended GND SE Impedance
I= 10mA
20
60
Disconnect and Diff Buffer Input Section
DISCNCT Threshold
0.8
2.0
V
DISCNCT Input Current
10
30
A
Diff Buffer Single Ended to LVD Threshold
0.5
0.7
V
Diff Buffer LVD to HPD Threshold
1.9
2.4
V
DIFFB Input Current
–10
10
A
Note 1: Guaranteed by design. Not 100% tested in production.
Note 2: Line+ (positive) tied to Line– (negative); []
12
.
(
max)
(
min)
V
II
VCM
VCM
Note 3: VLX= Output voltage for each terminator minus output pin (L1– through L15–) with each pin unloaded.
ILX = Output current for each terminator minus output pin (L1– through L15–) with the minus output pin forced to 0.2V.


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