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UCC5628FQPTR Datasheet(PDF) 1 Page - Texas Instruments

Part # UCC5628FQPTR
Description  Multimode SCSI 14 Line Terminator
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC5628FQPTR Datasheet(HTML) 1 Page - Texas Instruments

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UCC5628
DESCRIPTION
The UCC5628 Multimode SCSI Terminator provides a smooth transition
into the next generation of the SCSI Parallel Interface (SPI-2). It automati-
cally senses the bus, via DIFFB, and switches the termination to either sin-
gle ended (SE) or low voltage differential (LVD) SCSI, dependent on which
type of devices are connected to the bus. The UCC5628 can not be used
on a HVD, EIA485, differential SCSI bus. If the UCC5628 detects a HVD
SCSI device, it switches to a high impedance state.
The Multimode terminator contains all functions required to terminate and
auto detect and switch modes for SPI-2 bus architectures. Single Ended
and Differential impedances and currents are trimmed for maximum effec-
tiveness. Fail Safe biasing is provided to insure signal integrity. Device/Bus
type detection circuitry is integrated into the terminator to provide automatic
switching of termination between single ended and LVD SCSI and a high
impedance for HVD SCSI. The multimode function provides all the per-
formance analog functions necessary to implement SPI-2 termination in a
single monolithic device.
The UCC5628 is offered in a 48 pin LQFP package for a temperature
range of 0°C to 70°C.
Multimode SCSI 14 Line Terminator
FEATURES
• Auto Selection Single Ended (SE) or
Low Voltage Differential (LVD)
Termination
• Meets SCSI-1, SCSI-2, SCSI-3, SPI,
Ultra (Fast-20), Ultra2 (SPI-2 LVD)
and Ultra3 Standards
• 2.7V to 5.25V Operation
• Differential Failsafe Bias
• Thermal packaging for low junction
temperature and better MTBF.
SLUS302A - SEPTEMBER 1999
REF
1.25V
36
DISCNCT
REG
L1+
L14–
L14+
SOURCE/SINK REGULATOR
REF
1.3V
4.7
µF .
35
DIFFSEN
–15mA
≤I
SOURCE ≤–5mA
50
µA ≤I
SINK ≤200µA
HPD
SE
34
DIFFB
0.6V
2.15V
52.5
2
52.5
1
110
10
REF
2.7V
SE GND SWITCH
3
TRMPWR
25
GND
4-9
HS/GND
28-33
HS/GND
L1–
124
52.5
12
52.5
11
110
124
10
µA
1.3V
(NOISE LOAD)
MODE
SE
LVD
DISCNCT
ALL SWITCHES
UP
DOWN
OPEN
SE GND SWITCH
56mV
–+
+–
–+
56mV
56mV
56mV
+–
27
26
LVD
BLOCK DIAGRAM
UDG-98099


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