UCC5640
SLUS314C 鈥?JANUARY 2000 鈥?REVISED JUNE 2003
LOW VOLTAGE DIFFERENTIAL (LVD) SCSI 9 LINE TERMINATOR
FEATURES
D
First LVD only Active Terminator
D
Meets SCSI SPI-2 Ultra2 (Fast-40), SPI-3 Ultra3
D
D
/ Ultra160 (Fast-80) and SPI-4 (Fast-160)
Ultra320 Standards
2.7-V to 5.25-V Operation
Differential Failsafe Bias
DESCRIPTION
The UCC5640 is an active terminator for low voltage
differential (LVD) SCSI networks. This LVD only design
allows the user to reach peak bus performance while
reducing system cost. The device is designed as an
active Y-terminator to improve the frequency response
of the LVD bus. Designed with a 1.5-pF channel
capacitance, the UCC5640 allows for minimal bus
loading for a maximum number of peripherals. With the
UCC5640, the designer will be able to comply with the
Fast-40 SPI-2, Fast-80 SPI-3 and Fast-160 SPI-4
specifications. The UCC5640 also provides a much
needed system migration path for ever improving SCSI
system standards. This device is available in the 24-pin
TSSOP and 28-pin TSSOP for ease of layout use.
The UCC5640 is not designed for use in single ended
(SE) or high voltage differential (HVD) systems.
BLOCK DIAGRAM
TRMPWR
28
2.7V to 5.25V
SOURCE 5鈥?15mA
SINK 200
碌
A MAXIMUM (NOISE LOAD)
REF 1.3V
1.3V
+
0.1V
HIGH POWER
DIFFERENTIAL
OPEN CIRCUIT ON POWER OFF
OR OPEN CIRCUIT IN A
DISABLED TERMINATOR MODE
12
DIFSENS
2.4V > 1.9V
DIFFB 11
HIGH IMPEDANCE RECEIVER
EVEN WITH POWER OFF
0.7V > 0.5V
SOURCE/SINK REGULATOR
REF 1.25V
124
SINGLE
ENDED
56mV
鈥?/div>
+
56mV
+
鈥?/div>
124
56mV
鈥?/div>
+
56mV
+
鈥?/div>
14
*28 pin package only
GND
1
REG
52
27
LVD*
4
52
3
52
26
52
25
L1鈥?/div>
10
碌
A
L1+
L9鈥?/div>
DISCNCT
15
L9+
UDG鈥?8181
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.
Copyright
錚?/div>
2003, Texas Instruments Incorporated
www.ti.com
1
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