鈥?/div>
Thermal packaging for low junction
temperature and better MTBF.
DESCRIPTION
The UCC5639 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 UCC5639 can not be used
on a HVD, EIA485, differential SCSI bus. If the UCC5639 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 perform-
ance analog functions necessary to implement SPI-2 termination in a sin-
gle monolithic device.
The UCC5639 is offered in a 48 pin LQFP package for a temperature range
of 0擄C to 70擄C.
BLOCK DIAGRAM
(NOISE LOAD)
2.05V
DIFFB
34
0.6V
HIGH POWER
DIFFERENTIAL
LOW VOLTAGE
DIFFERENTIAL
SINGLE ENDED
110
SOURCE/SINK REGULATOR
124
REF
1.25V
MODE
SE
LVD
DISCNCT
ALL SWITCHES
UP
DOWN
OPEN
56mV
鈥?+
56mV
+ 鈥?/div>
SE GND SWITCH
110
124
52.5
11
L1+
52.5
12
L1鈥?/div>
REF
1.3V
鈥?5mA
鈮?/div>
I
SOURCE
鈮?/div>
鈥?mA
50碌A(chǔ)
鈮?/div>
I
SINK
鈮?/div>
200碌A(chǔ)
1.3V
35
DIFFSENS
REF
2.7V
DISCNCT 36
56mV
鈥?+
56mV
+ 鈥?/div>
52.5
2
52.5
1
L15+
L15鈥?/div>
TRMPWR
3
SE GND SWITCH
HS/GND
27
GND
4-9
HS/GND
28-33
10
4.7碌F
.
UDG-98110
REG
03/99
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UCC5639FQPTR 產(chǎn)品屬性
1,000
集成電路 (IC)
接口 - 信號(hào)終端器
-
SCSI，LVD，SE
15
2.7 V ~ 5.25 V
0°C ~ 70°C
表面貼裝
48-LQFP
48-LQFP（7x7）
帶卷 (TR)
UCC5639FQPTR相關(guān)型號(hào)PDF文件下載
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