鈥?/div>
Reversed Disconnect Polarity
DESCRIPTION
The UCC5631A 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 UCC5631A can not be used
on a HVD, EIA485, differential SCSI bus. If the UCC5631A detects a HVD
SCSI device, it switches to a high impedance state.
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 perfor-
mance analog functions necessary to implement SPI-2 termination in a sin-
gle monolithic device.
The UCC5631A is offered in a 36 pin SSOP package, as well as a 48 pin
LQFP package for a temperature range of 0擄C to 70擄C.
BLOCK DIAGRAM
HIPD
35
LVD
34
SE
33
(NOISE LOAD)
HIPD
REF 1.3V
LVD
1.3V
20
DIFSENS
2.15V
DIFFB
21
0.6V
MSTR/SLV
19
SE
110
鈥?5mA
鈮?/div>
I
SOURCE
鈮?/div>
鈥?mA
50碌A(chǔ)
鈮?/div>
I
SINK
鈮?/div>
200碌A(chǔ)
SE REF 2.7V
SOURCE/SINK REGULATOR
124
56mV
鈥?+
56mV
+ 鈥?/div>
MODE
ALL
SWITCHES
UP
DOWN
OPEN
OPEN
124
56mV
鈥?+
56mV
+ 鈥?/div>
52.5
31
L9+
52.5
32
L9鈥?/div>
110
SE GND SWITCH
52.5
4
L1+
52.5
5
L1鈥?/div>
LVD REF 1.25V
10碌A(chǔ)
SE
LVD
HIPD
ENABLE
SWITCHES
DISCNCT 17
DISCNCT
TRMPWR
36
SE GND SWITCH
18
GND
8
9
10
26
27
28
1
REG
PATENTED CIRCUIT DESIGN
HS/GND
Note: Indicated pinout is for 36 pin SSOP package.
UDG-99165
SLUS443 - OCTOBER 1999
UCC5631AFQP相關(guān)型號(hào)PDF文件下載
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型號(hào)
版本
描述
廠商
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