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UCC5629

更新时间： 2024-11-09 22:49:27
品牌 Logo 应用领域
德州仪器 - TI /
页数 文件大小 规格书
5页 57K
描述
Multimode SCSI 14 Line Terminator

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UCC5629 数据手册

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UCC5629  
Multimode SCSI 14 Line Terminator  
DESCRIPTION  
FEATURES  
The UCC5629 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 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.  
• 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  
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 perform-  
ance analog functions necessary to implement SPI-2 termination in a sin-  
gle monolithic device.  
• Thermal packaging for low junction  
temperature and better MTBF.  
• Reversed Polarity Disconnect  
The UCC5629 is offered in a 48 pin LQFP package for a temperature range  
of 0°C to 70°C.  
BLOCK DIAGRAM  
(NOISE LOAD)  
1.3V  
HPD  
REF  
1.3V  
–15mA ≤ I  
≤ –5mA  
≤ 200µA  
SOURCE  
35 DIFFSEN  
27 LVD  
50µA ≤ I  
SINK  
2.15V  
DIFFB 34  
0.6V  
SE  
26  
110  
124  
REF  
2.7V  
SOURCE/SINK REGULATOR  
56mV  
52.5  
52.5  
REF  
1.25V  
– +  
12 L1–  
56mV  
+
–
L1+  
11  
MODE  
SE  
ALL SWITCHES  
UP  
LVD  
DISCNCT  
DOWN  
OPEN  
SE GND SWITCH  
56mV  
10µA  
110  
124  
DISCNCT  
TRMPWR  
36  
3
52.5  
52.5  
–
+
2
1
L14–  
L14+  
56mV  
+
–
SE GND SWITCH  
HS/GND  
4-9  
HS/GND  
28-33  
25  
10  
REG  
4.7µF .  
GND  
UDG-99156  
SLUS444 - NOVEMBER 1999  
12345

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