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UCC5642MWPR

更新时间： 2024-09-19 23:39:07
品牌 Logo 应用领域
其他 - ETC 接口集成电路光电二极管信息通信管理
页数 文件大小 规格书
8页 138K
描述
TERMINATOR|SOP|36PIN|PLASTIC

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UCC5642MWPR 数据手册

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SLUS477 – FEBRUARY 2000 – REVISED DECEMBER 2000  
D
LVD-Only Active Termination  
2.7-V to 5.25-V Operation  
D
Thermal Packaging for Low Junction  
Temperature and Better MTBF  
D
D
D
D
2.85-V Regulator With Load Share  
Differential Failsafe Bias  
D
Meets Ultra2 (SPI-2 LVD), Ultra3/Ultra160  
(SPI-3) and Ultra320 (SPI-4) Standards  
Integrated SPI-3 Mode Change/Filter Delay  
description  
The UCC5642 is an LVD-only small computer system interface (SCSI) terminator that integrates the mode  
change delay function required by the SPI-3 specification. The device senses what types of SCSI drivers are  
present on the bus via the voltage on the DIFFSENS SCSI control line. Single-ended (SE) and high-voltage  
differential (HVD) (EIA485) SCSI drivers are not supported. If the chip detects the presence of an SE or HVD  
SCSI driver, it disconnects itself by switching all terminating resistors off the bus and enters a high-impedance  
state. The terminator can also be commanded to disconnect the terminating resistors with the DISCNCT input.  
Impedance is trimmed for accuracy and maximum effectiveness. Bus lines are biased to a failsafe state to  
ensure signal integrity. A 2.85-V, 300-mA sourcing regulator on chip can share with two other UCC5642 devices  
in a parallel configuration for a 900 mA total.  
The UCC5642 is offered in a 36-pin QSOP (MWP) package for a temperature range of 0°C to 70°C.  
block diagram  
VCC TO 2.85 V REGULATOR  
VOLTAGE  
VCC 24  
3.6 kΩ  
AMPLIFIER  
VOUTM 29  
CURRENT  
AMPLIFIER  
4 kΩ  
1.5 V  
25 VREG  
HPD  
30 SHARE  
31 LVD  
2.1 V  
0.6 V  
LVD  
TTL DRIVERS  
FILTER/  
DELAY  
DIFFB  
5
SE  
DIFFSENS  
REF 1.3 V  
6
DIFSENS  
TRMPWR 12  
ENABLE  
SOURCE/SINK  
REGULATOR  
SW1  
124  
56 mV  
LVD REF  
1.25 V  
52  
52  
10 µA  
−
+
21 L1–  
22 L1+  
56 mV  
DISCNCT  
HS/GND  
7
8
+
–
ENABLE  
OTHER  
HS/GND 10  
124  
56 mV  
MODE  
SW1  
52  
52  
SWITCHES  
–
+
HS/GND 26  
HS/GND 28  
GND 32  
34 L9–  
33 L9+  
SE  
LVD  
HPD  
DOWN OPEN  
DOWN DOWN  
DOWN OPEN  
56 mV  
+
–
DISCNCT OPEN OPEN  
11  
REG  
UDG-00158  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
Copyright 2000, Texas Instruments Incorporated  
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1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
12345678

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