UCC5629_08 Datasheet, PDF (1/12 Pages) Texas Instruments – MULTIMODE SCSI 14 LINE TERMINATOR

UCC5629
SLUS444A – NOVEMBER 1999 – REVISED MARCH 2003
MULTIMODE SCSI 14 LINE TERMINATOR
FEATURES
D Auto Selection Single-Ended (SE) or
Low-Voltage Differential (LVD) Termination
D Meets SCSI–1, SCSI–2, SCSI–3, SPI, Ultra
(Fast–20), Ultra2 (SPI–2 LVD), Ultra3, Ultra160
(SPI–3) and Ultra320 (SPI–4) Standards
D 2.7-V to 5.25-V Operation
D Differential Failsafe Bias
D Thermal Packaging for Low Junction
Temperature and Better MTBF
D Reversed Polarity Disconnect
DESCRIPTION
The UCC5629 multimode SCSI terminator provides a
smooth transition into the low-voltage differential (LVD)
SCSI parallel interface (SPI–2, SPI–3, SPI–4). It
automatically senses the bus, via DIFFB, and switches
the termination to either single-ended (SE) or
low-voltage differential (LVD) SCSI, dependent on
which type of devices are connected to the bus. The
UCC5629 can not be used on a HVD, EIA485,
differential SCSI bus. If the UCC5629 detects a HVD
SCSI device, it switches to a high-impedance state.
BLOCK DIAGRAM
2.15V
DIFFB 34
HPD
(NOISE LOAD)
–15 mA ≤ ISOURCE ≤ –5 mA
50 µA ≤ ISINK ≤ 200 µA
REF
1.3V
1.3V
ENABLE
35 DIFFSENS
27 LVD
0.6V
REF
2.7V
REF
1.25V
SOURCE/SINK REGULATOR
110 Ω
124 Ω
56mV
–+
56mV
+–
52.5 Ω
52.5 Ω
26 SE
12 L1
11 L1+
DISCNCT 36
10µA
ENABLE
TRMPWR 3
MODE
SE
LVD
DISCNCT
ALL SWITCHES
UP
DOWN
OPEN
25
GND
4–9
HS/GND
28–33
HS/GND
10
REG
110 Ω
SE GND SWITCH
124 Ω
56mV
–+
56mV
+–
52.5 Ω
52.5 Ω
SE GND SWITCH
2 L14
1 L14+
UDG–99156
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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Copyright  2003, Texas Instruments Incorporated
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