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UCC5681

更新时间： 2024-11-25 23:39:07
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7页 116K
描述
9 Line 2.7- 5V LVD Term. for Ultra2 through Ultra320 SCSI w/ SPI-3 Mode Change Delay & Rvrse Disconn

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UCC5681 数据手册

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SLUS441A – MARCH 1999 – REVISED AUGUST 2000  
D
LVD-Only Active Termination  
2.7 V to 5.25 V Operation  
Differential Failsafe Bias  
D
D
Standards Supported: SPI-3, Ultra2  
(Fast 40), Ultra3/Ultra160 (Fast 80)  
D
D
D
Reversed Disconnect Polarity  
Built-In SPI-3 Mode Change Filter/Delay  
description  
The UCC5681 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) SCSI drivers (EIA485) 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.  
The UCC5681 is offered in both 24-pin and 28-pin TSSOP (PW) packages for a temperature range of 0°C to  
70°C.  
functional block diagram  
HIGH–VOLTAGE  
DIFFERENTIAL  
2.15 V  
+
100 ms  
TO  
LOW–VOLTAGE  
DIFFERENTIAL  
DIFFB 11  
300 ms  
DELAY/  
FILTER  
27  
LVD{  
+
0.6 V  
SINGLE–ENDED  
–15 mA≤ I  
≤ –5 mA  
SOURCE  
REF  
1.3V  
12 DIFSENS  
µ
≤
≤
µ
50  
A
I
200 A  
SINK  
124  
56 mV  
REF  
1.25V  
52  
52  
µ
A
10  
–
+
4
3
L1 –  
L1+  
ENABLE  
DISCNCT 15  
TRMPWR 28  
56 mV  
+
–
DIS  
MODE ALL SWITCHES  
124  
56 mV  
SE  
LVD  
HVD  
OPEN  
DOWN  
OPEN  
OPEN  
52  
52  
–
+
DISCNCT  
25 L9 –  
26 L9+  
56 mV  
DISCNCT  
+
–
14  
1
{28-PIN PACKAGE ONLY  
GND  
REG  
UDG–00126  
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  
1234567

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