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UCC5638_06

更新时间： 2024-11-11 02:58:27
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德州仪器 - TI /
页数 文件大小 规格书
8页 127K
描述
Multimode SCSI 15 Line Terminator

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中文翻译

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UCC5638_06 数据手册

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UCC5638  
Multimode SCSI 15 Line Terminator  
DESCRIPTION  
FEATURES  
The UCC5638 Multimode SCSI Terminator provides a smooth transition  
into the 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 UCC5638 can not be used  
on a HVD, EIA485, differential SCSI bus. If the UCC5638 detects a HVD  
SCSI device, it switches to a high impedance state.  
• Auto Selection Single Ended (SE) or  
Low Voltage Differential (LVD)  
Termination  
• Meets SCSI-1, SCSI-2, Ultra2 (SPI-2  
LVD SCSI), Ultra3, Ultra160 (SPI-3)  
and Ultra320 (SPI-4) Standards  
• 2.7V to 5.25V Operation  
• Differential Failsafe Bias  
The Multimode terminator contains all functions required to terminate and  
auto detect and switch modes for SPI-2, SPI-3 and SPI-4 bus architectures.  
Single Ended and Differential impedances and currents are trimmed for  
maximum effectiveness. Fail Safe biasing is provided to insure signal integ-  
rity. 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 pro-  
vides all the performance analog functions necessary to implement SPI-2  
termination in a single monolithic device.  
• Thermal packaging for low junction  
temperature and better MTBF.  
The UCC5638 is offered in a 48 pin LQFP package for a temperature range  
of 0°C to 70°C.  
BLOCK DIAGRAM  
(NOISE LOAD)  
HIGH POWER  
2.15V  
DIFFB 34  
0.6V  
DIFFERENTIAL  
REF  
1.3V  
1.3V  
35 DIFFSEN  
LOW VOLTAGE  
DIFFERENTIAL  
–15mA ≤ I  
50µA ≤ I  
≤ –5mA  
SOURCE  
≤ 200µA  
SINGLE ENDED  
SINK  
110  
124  
REF  
2.7V  
SOURCE/SINK REGULATOR  
56mV  
52.5  
52.5  
–
+
REF  
1.25V  
12 L1–  
11 L1+  
56mV  
+
–
MODE  
SE  
ALL SWITCHES  
UP  
LVD  
DISCNCT  
DOWN  
OPEN  
SE GND SWITCH  
10µA  
110  
124  
DISCNCT  
TRMPWR  
36  
3
56mV  
52.5  
52.5  
–
+
2
1
L15–  
L15+  
56mV  
+
–
SE GND SWITCH  
HS/GND  
4-9  
HS/GND  
28-33  
27  
10  
REG  
GND  
4.7µF .  
UDG-98063  
SLUS271B - FEBRUARY 2000 - REVISED APRIL 2001  
12345678

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