UCC5681
9 LINE LVD ONLY SCSI TERMINATOR WITH INTEGRATED
SPI 3 DELAYS AND REVERSE DISCONNECT
SLUS441A 鈥?MARCH 1999 鈥?REVISED AUGUST 2000
D
D
D
D
LVD-Only Active Termination
2.7 V to 5.25 V Operation
Differential Failsafe Bias
Built-In SPI-3 Mode Change Filter/Delay
D
Standards Supported: SPI-3, Ultra2
D
(Fast 40), Ultra3/Ultra160 (Fast 80)
Reversed Disconnect Polarity
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擄C to
70擄C.
functional block diagram
2.15 V
DIFFB
11
+
100 ms
TO
300 ms
DELAY/
FILTER
HIGH鈥揤OLTAGE
DIFFERENTIAL
LOW鈥揤OLTAGE
DIFFERENTIAL
SINGLE鈥揈NDED
鈥?5 mA鈮?I
SOURCE
鈮?/div>
鈥? mA
50
碌A(chǔ) 鈮?/div>
I
SINK
鈮?/div>
200
碌A(chǔ)
REF
1.3V
12
DIFSENS
27
LVD{
+
0.6 V
10
碌A(chǔ)
DISCNCT
15
ENABLE
REF
1.25V
124
56 mV
鈥?+
56 mV
+ 鈥?/div>
52
4
52
3
L1+
L1 鈥?/div>
TRMPWR 28
DIS
DISCNCT
MODE
SE
LVD
HVD
DISCNCT
ALL SWITCHES
OPEN
DOWN
OPEN
OPEN
124
56 mV
鈥?+
56 mV
+ 鈥?/div>
1
REG
52
26
L9+
52
25
L9 鈥?/div>
14
GND
{28-PIN
PACKAGE ONLY
UDG鈥?0126
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright
錚?/div>
2000, Texas Instruments Incorporated
POST OFFICE BOX 655303
鈥?/div>
DALLAS, TEXAS 75265
1
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