鈥?/div>
Reversed Disconnect Polarity
DESCRIPTION
The UCC5641 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 1.5pF channel capacitance, the UCC5641 allows for mini-
mal bus loading for a maximum number of peripherals. With the
UCC5641, the designer will be able to comply with the Fast-40 SPI-2 and
Fast-80 SPI-3 specifications. The UCC5641 also provides a much-needed
system migration path for ever improving SCSI system standards. This de-
vice is available in the 24 pin TSSOP and 28 pin TSSOP for ease of lay-
out use.
The UCC5641 is not designed for use in single ended or high voltage dif-
ferential systems.
BLOCK DIAGRAM
SOURCE ONLY FROM TRMPWR AND THE ENABLED TERMINATIONS
OPEN CIRCUIT ON POWER OFF
OR OPEN CIRCUIT IN A
DISABLED TERMINATOR MODE
12
1.3V
鹵
0.1V
HIGH POWER
DIFFERENTIAL
DIFSENS
TRMPWR 28
2.7V to 5.25V
SOURCE 5鈥?5mA
SINK 200碌A(chǔ) MAXIMUM (NOISE LOAD)
REF 1.3V
2.4V > 1.9V
DIFFB
20k
11
0.1碌F
HIGH IMPEDANCE RECEIVER
EVEN WITH POWER OFF
0.7V > 0.5V
SOURCE/SINK REGULATOR
LOW
FREQUENCY
FILTER
50Hz 鈥?60Hz
REF 1.25V
124
27
LVD*
SINGLE
ENDED
56mV
鈥?/div>
+
56mV
+
鈥?/div>
124
56mV
鈥?/div>
+
56mV
+
鈥?/div>
52
4
52
3
52
26
52
25
L9+
L9鈥?/div>
L1+
L1鈥?/div>
10碌A(chǔ)
DISCNCT 15
14
GND
1
REG
4.7碌F
UDG-99160
* 28 pin package only
SLUS397 - JANUARY 2000
UCC5641PW28相關(guān)型號PDF文件下載
-
型號
版本
描述
廠商
下載
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